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erste version, test vor configure

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This commit is contained in:
Marc Wäckerlin
2004-04-21 06:39:20 +00:00
parent 564c1f4ef3
commit c456fa7006
19 changed files with 2577 additions and 0 deletions
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31
mrw/auto.cpp Normal file
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#include <mrw/auto.hpp>
#include <unistd.h> // close
#include <sys/stat.h> // fstat
#include <sys/mman.h> // mmap
namespace mrw {
//----------------------------------------------------------------------------
AutoFile& AutoFile::reset(int fd) throw() {
if (_fd!=-1) close(_fd);
_fd = fd;
return *this;
}
//----------------------------------------------------------------------------
AutoMapper::AutoMapper(int fd, size_t sz, void* addr,
int prot, int flags, off_t off) throw() {
if (!(_sz=sz)) {
struct stat st;
if (fd==-1 || fstat(fd, &st)==-1) {release(); return;}
_sz = st.st_size;
}
if ((_cont=mmap(addr, _sz, prot, flags, fd, off))==MAP_FAILED) release();
}
//----------------------------------------------------------------------------
AutoMapper::~AutoMapper() throw() {
if (_cont && _sz) munmap(_cont, _sz);
}
}

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mrw/auto.hpp Normal file
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#ifndef __MRW_AUTO_HPP__
#define __MRW_AUTO_HPP__
#include <sys/types.h> // size_t
#include <sys/mman.h> // PROT_READ, MAP_SHARED
#include <bfd.h> // bfd*
namespace mrw {
/** @defgroup AutoTools Classes for Automated Resource Handling
For pointers that have been allocated with @c new, you can use
std::auto_ptr to automatically free them when you leave the
context. Unfortunately there is no such thing for @c malloc
(except @c malloca that only works for a subset of problems: if
you and not a system call allocates memory), @c open and so on.
These classes can take over the resource ownership.
*/
//@{
/** @brief Automatically closes a file when destructed.
AutoFile works exactly like std::auto_ptr, but not for files
instead of pointers. Whenever the context of AutoFile is left,
the opened file is close. This way, resources are freed even in
case of exceptions.
*/
class AutoFile {
public:
/// @brief Construct from an opened file.
/// @note Don't close @c fd
explicit AutoFile(int fd = -1) throw(): _fd(fd) {}
/// @brief Takeover ownership from another AutoFile.
AutoFile(AutoFile& o) throw(): _fd(o.release()) {}
/// @brief Closes file if open.
~AutoFile() throw() {reset();}
/// @brief Assign new file descriptor.
/// The old file of @c this is closed if open.
AutoFile& operator=(int fd) throw() {return reset(fd);}
/// @brief Takeover ownership from another AutoFile.
/// The old file of @c this is closed if open.
AutoFile& operator=(AutoFile& other) throw() {
return reset(other.release());
}
/// @brief get the file descriptor @return file descriptor
operator const int() const throw() {
return _fd;
}
/// @brief Give away ownership of the file. @return old file descriptor
int release() throw() {
int ret(_fd); _fd=-1;
return ret;
}
/// @brief assign a new file descriptor
/** The old file of @c this is closed if open. */
AutoFile& reset(int = -1) throw();
private:
int _fd; ///< the file descriptor
};
/** @brief Automatically call @c munmap for mmaped files on destruction.
It's the same as std::auto_ptr, but for @c mmap instead of @c
new. When the context of @c AutoMapper is left, @c munmap is
called.
*/
class AutoMapper {
public:
AutoMapper(void* cont = 0, size_t sz = 0) throw():
_cont(cont), _sz(sz) {}
AutoMapper(int, size_t=0, void* = 0,
int = PROT_READ, int = MAP_SHARED, off_t = 0) throw();
~AutoMapper() throw();
operator const void*() const throw() {return _cont;}
AutoMapper& set(void* cont, size_t sz) throw() {
_cont=cont; _sz=sz;
return *this;
}
void* release() throw() {
void* ret(_cont); _cont=0; _sz=0;
return ret;
}
const void* last() const throw() {
return _cont && _sz ? (void*)((size_t)_cont+_sz-1) : 0;
}
private:
void* _cont;
size_t _sz;
};
/** @brief Automatically call @c bfd_close for @c bfd*.
It acts like a @c std::auto_ptr, but for @c bfd*, that means it
calls @c bfd_close whenever the context is left.
*/
class AutoBfd {
public:
AutoBfd(bfd* p=0) throw(): _bfd(p) {}
~AutoBfd() throw() {if (_bfd) bfd_close(_bfd);}
AutoBfd& operator=(bfd* p) throw() {
release(); _bfd=p; return *this;
}
AutoBfd& operator=(AutoBfd& o) throw() {
release(); _bfd=o.release(); return *this;
}
operator bfd*() throw() {return _bfd;}
bfd* operator->() throw() {return _bfd;}
bfd* release() throw() {bfd* res(_bfd); _bfd = 0; return res;}
private:
bfd* _bfd;
};
/** @brief Automatically calls @c free for @c malloc allocated memory.
It works like a @c std::auto_ptr, but for memory that was
allocated with @c malloc, not @c new. Memory is freed, whenever
the context od @c AutoFree is left.
*/
template <class T> class AutoFree {
public:
AutoFree(T* p=0) throw(): _p(p) {}
AutoFree(AutoFree& o) throw(): _p(o.release()) {}
~AutoFree() throw() {if (_p) free(_p);}
AutoFree& operator=(T* p) throw() {
release(); _p=p; return *this;
}
AutoFree& operator=(AutoFree& o) throw() {
release(); _p=o.release(); return *this;
}
operator T*() {return _p;}
operator T**() {return &_p;}
operator bool() {return _p;}
T* release() throw() {T* r(_p); _p=0; return r;}
private:
T* _p;
};
//@}
}
#endif

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mrw/auto_test.cpp Normal file
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#include <mrw/auto.hpp>
#include <cppunit/TestFixture.h>
#include <cppunit/ui/text/TestRunner.h>
#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <fcntl.h> // open
class AutoTest: public CppUnit::TestFixture {
public:
void AutoFile() {
char c(0);
int i(-1);
{
mrw::AutoFile a;
CPPUNIT_ASSERT(a==-1); // init as -1
i = a = open("test.dat", O_RDONLY);
CPPUNIT_ASSERT(i==a && a>0); // file is now open
mrw::AutoFile b(a);
CPPUNIT_ASSERT(a==-1 && i==b); // b has taken ownership
CPPUNIT_ASSERT(read(b, &c, 1)==1 && c=='H'); // file is good
mrw::AutoFile c(i);
CPPUNIT_ASSERT(i==b && b==c); // ooops, two owner!
c.release();
CPPUNIT_ASSERT(i==b && c==-1); // it's ok now
b = open("test.dat", O_RDONLY);
//close(i);
CPPUNIT_ASSERT(read(i, &c, 1)==-1); // old file is closed
i = b.reset();
CPPUNIT_ASSERT(read(i, &c, 1)==-1); // new file is closed
i = a = open("test.dat", O_RDONLY);
}
CPPUNIT_ASSERT(read(i, &c, 1)==-1); // file is closed now
}
CPPUNIT_TEST_SUITE(AutoTest);
CPPUNIT_TEST(AutoFile);
CPPUNIT_TEST_SUITE_END();
};
CPPUNIT_TEST_SUITE_REGISTRATION(AutoTest);
int main() {
CppUnit::TextUi::TestRunner runner;
runner.addTest(CppUnit::TestFactoryRegistry::getRegistry().makeTest());
return runner.run() ? 0 : 1;
}
static char* c = new char[100];

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mrw/autostacktracestderr.cpp Normal file
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#include <mrw/stacktrace.hpp>
#include <mrw/exception.hpp>
#include <exception>
#include <iostream>
namespace mrw {
/// @todo integrate it into the distribution and document it
void unexpected() {
std::cerr<<"UNEXPECTED EXCEPTION: ----------------------------"<<std::endl;
try {
throw;
} catch (const mrw::exception& x) {
StackTrace::createSymtable();
std::cerr<<"---------- Reason:"<<std::endl
<<x.what()<<std::endl
<<"---------- Stack:"<<std::endl
<<x.stacktrace()<<std::endl;
} catch (const std::exception& x) {
std::cerr<<"---------- Reason:"<<std::endl
<<x.what()<<std::endl
<<"---------- Stack: **** not available ****"<<std::endl;
} catch (...) {
std::cerr<<"---------- Reason: **** not available ****"<<std::endl
<<"---------- Stack: **** not available ****"<<std::endl;
}
std::cerr<<"-------------------------------------------------"<<std::endl;
throw std::bad_exception();
}
class AutoStackTrace {
public:
AutoStackTrace() {
std::set_unexpected(&mrw::unexpected);
}
};
// initialize stack traces (load symbols)
static AutoStackTrace _autoStackTrace;
}

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# Doxyfile 1.3.2
# This file describes the settings to be used by the documentation system
# doxygen (www.doxygen.org) for a project
#
# All text after a hash (#) is considered a comment and will be ignored
# The format is:
# TAG = value [value, ...]
# For lists items can also be appended using:
# TAG += value [value, ...]
# Values that contain spaces should be placed between quotes (" ")
#---------------------------------------------------------------------------
# General configuration options
#---------------------------------------------------------------------------
# The PROJECT_NAME tag is a single word (or a sequence of words surrounded
# by quotes) that should identify the project.
PROJECT_NAME = "MRW C++ Library"
# The PROJECT_NUMBER tag can be used to enter a project or revision number.
# This could be handy for archiving the generated documentation or
# if some version control system is used.
PROJECT_NUMBER = experimental
# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
# base path where the generated documentation will be put.
# If a relative path is entered, it will be relative to the location
# where doxygen was started. If left blank the current directory will be used.
OUTPUT_DIRECTORY = doc
# The OUTPUT_LANGUAGE tag is used to specify the language in which all
# documentation generated by doxygen is written. Doxygen will use this
# information to generate all constant output in the proper language.
# The default language is English, other supported languages are:
# Brazilian, Catalan, Chinese, Chinese-Traditional, Croatian, Czech, Danish, Dutch,
# Finnish, French, German, Greek, Hungarian, Italian, Japanese, Japanese-en
# (Japanese with English messages), Korean, Norwegian, Polish, Portuguese,
# Romanian, Russian, Serbian, Slovak, Slovene, Spanish, Swedish, and Ukrainian.
OUTPUT_LANGUAGE = English
# This tag can be used to specify the encoding used in the generated output.
# The encoding is not always determined by the language that is chosen,
# but also whether or not the output is meant for Windows or non-Windows users.
# In case there is a difference, setting the USE_WINDOWS_ENCODING tag to YES
# forces the Windows encoding (this is the default for the Windows binary),
# whereas setting the tag to NO uses a Unix-style encoding (the default for
# all platforms other than Windows).
USE_WINDOWS_ENCODING = NO
# If the EXTRACT_ALL tag is set to YES doxygen will assume all entities in
# documentation are documented, even if no documentation was available.
# Private class members and static file members will be hidden unless
# the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set to YES
EXTRACT_ALL = NO
# If the EXTRACT_PRIVATE tag is set to YES all private members of a class
# will be included in the documentation.
EXTRACT_PRIVATE = NO
# If the EXTRACT_STATIC tag is set to YES all static members of a file
# will be included in the documentation.
EXTRACT_STATIC = NO
# If the EXTRACT_LOCAL_CLASSES tag is set to YES classes (and structs)
# defined locally in source files will be included in the documentation.
# If set to NO only classes defined in header files are included.
EXTRACT_LOCAL_CLASSES = NO
# If the HIDE_UNDOC_MEMBERS tag is set to YES, Doxygen will hide all
# undocumented members of documented classes, files or namespaces.
# If set to NO (the default) these members will be included in the
# various overviews, but no documentation section is generated.
# This option has no effect if EXTRACT_ALL is enabled.
HIDE_UNDOC_MEMBERS = NO
# If the HIDE_UNDOC_CLASSES tag is set to YES, Doxygen will hide all
# undocumented classes that are normally visible in the class hierarchy.
# If set to NO (the default) these classes will be included in the various
# overviews. This option has no effect if EXTRACT_ALL is enabled.
HIDE_UNDOC_CLASSES = NO
# If the HIDE_FRIEND_COMPOUNDS tag is set to YES, Doxygen will hide all
# friend (class|struct|union) declarations.
# If set to NO (the default) these declarations will be included in the
# documentation.
HIDE_FRIEND_COMPOUNDS = NO
# If the HIDE_IN_BODY_DOCS tag is set to YES, Doxygen will hide any
# documentation blocks found inside the body of a function.
# If set to NO (the default) these blocks will be appended to the
# function's detailed documentation block.
HIDE_IN_BODY_DOCS = NO
# If the BRIEF_MEMBER_DESC tag is set to YES (the default) Doxygen will
# include brief member descriptions after the members that are listed in
# the file and class documentation (similar to JavaDoc).
# Set to NO to disable this.
BRIEF_MEMBER_DESC = YES
# If the REPEAT_BRIEF tag is set to YES (the default) Doxygen will prepend
# the brief description of a member or function before the detailed description.
# Note: if both HIDE_UNDOC_MEMBERS and BRIEF_MEMBER_DESC are set to NO, the
# brief descriptions will be completely suppressed.
REPEAT_BRIEF = YES
# If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then
# Doxygen will generate a detailed section even if there is only a brief
# description.
ALWAYS_DETAILED_SEC = NO
# If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all inherited
# members of a class in the documentation of that class as if those members were
# ordinary class members. Constructors, destructors and assignment operators of
# the base classes will not be shown.
INLINE_INHERITED_MEMB = NO
# If the FULL_PATH_NAMES tag is set to YES then Doxygen will prepend the full
# path before files name in the file list and in the header files. If set
# to NO the shortest path that makes the file name unique will be used.
FULL_PATH_NAMES = YES
# If the FULL_PATH_NAMES tag is set to YES then the STRIP_FROM_PATH tag
# can be used to strip a user-defined part of the path. Stripping is
# only done if one of the specified strings matches the left-hand part of
# the path. It is allowed to use relative paths in the argument list.
STRIP_FROM_PATH = ../
# The INTERNAL_DOCS tag determines if documentation
# that is typed after a \internal command is included. If the tag is set
# to NO (the default) then the documentation will be excluded.
# Set it to YES to include the internal documentation.
INTERNAL_DOCS = NO
# If the CASE_SENSE_NAMES tag is set to NO then Doxygen will only generate
# file names in lower-case letters. If set to YES upper-case letters are also
# allowed. This is useful if you have classes or files whose names only differ
# in case and if your file system supports case sensitive file names. Windows
# users are advised to set this option to NO.
CASE_SENSE_NAMES = YES
# If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter
# (but less readable) file names. This can be useful is your file systems
# doesn't support long names like on DOS, Mac, or CD-ROM.
SHORT_NAMES = NO
# If the HIDE_SCOPE_NAMES tag is set to NO (the default) then Doxygen
# will show members with their full class and namespace scopes in the
# documentation. If set to YES the scope will be hidden.
HIDE_SCOPE_NAMES = NO
# If the SHOW_INCLUDE_FILES tag is set to YES (the default) then Doxygen
# will put a list of the files that are included by a file in the documentation
# of that file.
SHOW_INCLUDE_FILES = YES
# If the JAVADOC_AUTOBRIEF tag is set to YES then Doxygen
# will interpret the first line (until the first dot) of a JavaDoc-style
# comment as the brief description. If set to NO, the JavaDoc
# comments will behave just like the Qt-style comments (thus requiring an
# explict @brief command for a brief description.
JAVADOC_AUTOBRIEF = NO
# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make Doxygen
# treat a multi-line C++ special comment block (i.e. a block of //! or ///
# comments) as a brief description. This used to be the default behaviour.
# The new default is to treat a multi-line C++ comment block as a detailed
# description. Set this tag to YES if you prefer the old behaviour instead.
MULTILINE_CPP_IS_BRIEF = NO
# If the DETAILS_AT_TOP tag is set to YES then Doxygen
# will output the detailed description near the top, like JavaDoc.
# If set to NO, the detailed description appears after the member
# documentation.
DETAILS_AT_TOP = YES
# If the INHERIT_DOCS tag is set to YES (the default) then an undocumented
# member inherits the documentation from any documented member that it
# reimplements.
INHERIT_DOCS = YES
# If the INLINE_INFO tag is set to YES (the default) then a tag [inline]
# is inserted in the documentation for inline members.
INLINE_INFO = YES
# If the SORT_MEMBER_DOCS tag is set to YES (the default) then doxygen
# will sort the (detailed) documentation of file and class members
# alphabetically by member name. If set to NO the members will appear in
# declaration order.
SORT_MEMBER_DOCS = YES
# If member grouping is used in the documentation and the DISTRIBUTE_GROUP_DOC
# tag is set to YES, then doxygen will reuse the documentation of the first
# member in the group (if any) for the other members of the group. By default
# all members of a group must be documented explicitly.
DISTRIBUTE_GROUP_DOC = NO
# The TAB_SIZE tag can be used to set the number of spaces in a tab.
# Doxygen uses this value to replace tabs by spaces in code fragments.
TAB_SIZE = 8
# The GENERATE_TODOLIST tag can be used to enable (YES) or
# disable (NO) the todo list. This list is created by putting \todo
# commands in the documentation.
GENERATE_TODOLIST = YES
# The GENERATE_TESTLIST tag can be used to enable (YES) or
# disable (NO) the test list. This list is created by putting \test
# commands in the documentation.
GENERATE_TESTLIST = YES
# The GENERATE_BUGLIST tag can be used to enable (YES) or
# disable (NO) the bug list. This list is created by putting \bug
# commands in the documentation.
GENERATE_BUGLIST = YES
# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or
# disable (NO) the deprecated list. This list is created by putting
# \deprecated commands in the documentation.
GENERATE_DEPRECATEDLIST= YES
# This tag can be used to specify a number of aliases that acts
# as commands in the documentation. An alias has the form "name=value".
# For example adding "sideeffect=\par Side Effects:\n" will allow you to
# put the command \sideeffect (or @sideeffect) in the documentation, which
# will result in a user-defined paragraph with heading "Side Effects:".
# You can put \n's in the value part of an alias to insert newlines.
ALIASES =
# The ENABLED_SECTIONS tag can be used to enable conditional
# documentation sections, marked by \if sectionname ... \endif.
ENABLED_SECTIONS =
# The MAX_INITIALIZER_LINES tag determines the maximum number of lines
# the initial value of a variable or define consists of for it to appear in
# the documentation. If the initializer consists of more lines than specified
# here it will be hidden. Use a value of 0 to hide initializers completely.
# The appearance of the initializer of individual variables and defines in the
# documentation can be controlled using \showinitializer or \hideinitializer
# command in the documentation regardless of this setting.
MAX_INITIALIZER_LINES = 30
# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources
# only. Doxygen will then generate output that is more tailored for C.
# For instance, some of the names that are used will be different. The list
# of all members will be omitted, etc.
OPTIMIZE_OUTPUT_FOR_C = NO
# Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java sources
# only. Doxygen will then generate output that is more tailored for Java.
# For instance, namespaces will be presented as packages, qualified scopes
# will look different, etc.
OPTIMIZE_OUTPUT_JAVA = NO
# Set the SHOW_USED_FILES tag to NO to disable the list of files generated
# at the bottom of the documentation of classes and structs. If set to YES the
# list will mention the files that were used to generate the documentation.
SHOW_USED_FILES = YES
#---------------------------------------------------------------------------
# configuration options related to warning and progress messages
#---------------------------------------------------------------------------
# The QUIET tag can be used to turn on/off the messages that are generated
# by doxygen. Possible values are YES and NO. If left blank NO is used.
QUIET = NO
# The WARNINGS tag can be used to turn on/off the warning messages that are
# generated by doxygen. Possible values are YES and NO. If left blank
# NO is used.
WARNINGS = YES
# If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate warnings
# for undocumented members. If EXTRACT_ALL is set to YES then this flag will
# automatically be disabled.
WARN_IF_UNDOCUMENTED = NO
# If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings for
# potential errors in the documentation, such as not documenting some
# parameters in a documented function, or documenting parameters that
# don't exist or using markup commands wrongly.
WARN_IF_DOC_ERROR = YES
# The WARN_FORMAT tag determines the format of the warning messages that
# doxygen can produce. The string should contain the $file, $line, and $text
# tags, which will be replaced by the file and line number from which the
# warning originated and the warning text.
WARN_FORMAT = "$file:$line: $text"
# The WARN_LOGFILE tag can be used to specify a file to which warning
# and error messages should be written. If left blank the output is written
# to stderr.
WARN_LOGFILE = doxygen.errors
#---------------------------------------------------------------------------
# configuration options related to the input files
#---------------------------------------------------------------------------
# The INPUT tag can be used to specify the files and/or directories that contain
# documented source files. You may enter file names like "myfile.cpp" or
# directories like "/usr/src/myproject". Separate the files or directories
# with spaces.
INPUT = ../mrw
# If the value of the INPUT tag contains directories, you can use the
# FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
# and *.h) to filter out the source-files in the directories. If left
# blank the following patterns are tested:
# *.c *.cc *.cxx *.cpp *.c++ *.java *.ii *.ixx *.ipp *.i++ *.inl *.h *.hh *.hxx *.hpp
# *.h++ *.idl *.odl *.cs
FILE_PATTERNS =
# The RECURSIVE tag can be used to turn specify whether or not subdirectories
# should be searched for input files as well. Possible values are YES and NO.
# If left blank NO is used.
RECURSIVE = NO
# The EXCLUDE tag can be used to specify files and/or directories that should
# excluded from the INPUT source files. This way you can easily exclude a
# subdirectory from a directory tree whose root is specified with the INPUT tag.
EXCLUDE =
# The EXCLUDE_SYMLINKS tag can be used select whether or not files or directories
# that are symbolic links (a Unix filesystem feature) are excluded from the input.
EXCLUDE_SYMLINKS = NO
# If the value of the INPUT tag contains directories, you can use the
# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude
# certain files from those directories.
EXCLUDE_PATTERNS =
# The EXAMPLE_PATH tag can be used to specify one or more files or
# directories that contain example code fragments that are included (see
# the \include command).
EXAMPLE_PATH = examples
# If the value of the EXAMPLE_PATH tag contains directories, you can use the
# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
# and *.h) to filter out the source-files in the directories. If left
# blank all files are included.
EXAMPLE_PATTERNS =
# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
# searched for input files to be used with the \include or \dontinclude
# commands irrespective of the value of the RECURSIVE tag.
# Possible values are YES and NO. If left blank NO is used.
EXAMPLE_RECURSIVE = NO
# The IMAGE_PATH tag can be used to specify one or more files or
# directories that contain image that are included in the documentation (see
# the \image command).
IMAGE_PATH =
# The INPUT_FILTER tag can be used to specify a program that doxygen should
# invoke to filter for each input file. Doxygen will invoke the filter program
# by executing (via popen()) the command <filter> <input-file>, where <filter>
# is the value of the INPUT_FILTER tag, and <input-file> is the name of an
# input file. Doxygen will then use the output that the filter program writes
# to standard output.
INPUT_FILTER =
# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using
# INPUT_FILTER) will be used to filter the input files when producing source
# files to browse (i.e. when SOURCE_BROWSER is set to YES).
FILTER_SOURCE_FILES = NO
#---------------------------------------------------------------------------
# configuration options related to source browsing
#---------------------------------------------------------------------------
# If the SOURCE_BROWSER tag is set to YES then a list of source files will
# be generated. Documented entities will be cross-referenced with these sources.
SOURCE_BROWSER = NO
# Setting the INLINE_SOURCES tag to YES will include the body
# of functions and classes directly in the documentation.
INLINE_SOURCES = NO
# Setting the STRIP_CODE_COMMENTS tag to YES (the default) will instruct
# doxygen to hide any special comment blocks from generated source code
# fragments. Normal C and C++ comments will always remain visible.
STRIP_CODE_COMMENTS = YES
# If the REFERENCED_BY_RELATION tag is set to YES (the default)
# then for each documented function all documented
# functions referencing it will be listed.
REFERENCED_BY_RELATION = YES
# If the REFERENCES_RELATION tag is set to YES (the default)
# then for each documented function all documented entities
# called/used by that function will be listed.
REFERENCES_RELATION = YES
# If the VERBATIM_HEADERS tag is set to YES (the default) then Doxygen
# will generate a verbatim copy of the header file for each class for
# which an include is specified. Set to NO to disable this.
VERBATIM_HEADERS = YES
#---------------------------------------------------------------------------
# configuration options related to the alphabetical class index
#---------------------------------------------------------------------------
# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index
# of all compounds will be generated. Enable this if the project
# contains a lot of classes, structs, unions or interfaces.
ALPHABETICAL_INDEX = YES
# If the alphabetical index is enabled (see ALPHABETICAL_INDEX) then
# the COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns
# in which this list will be split (can be a number in the range [1..20])
COLS_IN_ALPHA_INDEX = 5
# In case all classes in a project start with a common prefix, all
# classes will be put under the same header in the alphabetical index.
# The IGNORE_PREFIX tag can be used to specify one or more prefixes that
# should be ignored while generating the index headers.
IGNORE_PREFIX =
#---------------------------------------------------------------------------
# configuration options related to the HTML output
#---------------------------------------------------------------------------
# If the GENERATE_HTML tag is set to YES (the default) Doxygen will
# generate HTML output.
GENERATE_HTML = YES
# The HTML_OUTPUT tag is used to specify where the HTML docs will be put.
# If a relative path is entered the value of OUTPUT_DIRECTORY will be
# put in front of it. If left blank `html' will be used as the default path.
HTML_OUTPUT = html
# The HTML_FILE_EXTENSION tag can be used to specify the file extension for
# each generated HTML page (for example: .htm,.php,.asp). If it is left blank
# doxygen will generate files with .html extension.
HTML_FILE_EXTENSION = .html
# The HTML_HEADER tag can be used to specify a personal HTML header for
# each generated HTML page. If it is left blank doxygen will generate a
# standard header.
HTML_HEADER =
# The HTML_FOOTER tag can be used to specify a personal HTML footer for
# each generated HTML page. If it is left blank doxygen will generate a
# standard footer.
HTML_FOOTER =
# The HTML_STYLESHEET tag can be used to specify a user-defined cascading
# style sheet that is used by each HTML page. It can be used to
# fine-tune the look of the HTML output. If the tag is left blank doxygen
# will generate a default style sheet
HTML_STYLESHEET =
# If the HTML_ALIGN_MEMBERS tag is set to YES, the members of classes,
# files or namespaces will be aligned in HTML using tables. If set to
# NO a bullet list will be used.
HTML_ALIGN_MEMBERS = YES
# If the GENERATE_HTMLHELP tag is set to YES, additional index files
# will be generated that can be used as input for tools like the
# Microsoft HTML help workshop to generate a compressed HTML help file (.chm)
# of the generated HTML documentation.
GENERATE_HTMLHELP = NO
# If the GENERATE_HTMLHELP tag is set to YES, the CHM_FILE tag can
# be used to specify the file name of the resulting .chm file. You
# can add a path in front of the file if the result should not be
# written to the html output dir.
CHM_FILE =
# If the GENERATE_HTMLHELP tag is set to YES, the HHC_LOCATION tag can
# be used to specify the location (absolute path including file name) of
# the HTML help compiler (hhc.exe). If non-empty doxygen will try to run
# the HTML help compiler on the generated index.hhp.
HHC_LOCATION =
# If the GENERATE_HTMLHELP tag is set to YES, the GENERATE_CHI flag
# controls if a separate .chi index file is generated (YES) or that
# it should be included in the master .chm file (NO).
GENERATE_CHI = NO
# If the GENERATE_HTMLHELP tag is set to YES, the BINARY_TOC flag
# controls whether a binary table of contents is generated (YES) or a
# normal table of contents (NO) in the .chm file.
BINARY_TOC = NO
# The TOC_EXPAND flag can be set to YES to add extra items for group members
# to the contents of the HTML help documentation and to the tree view.
TOC_EXPAND = NO
# The DISABLE_INDEX tag can be used to turn on/off the condensed index at
# top of each HTML page. The value NO (the default) enables the index and
# the value YES disables it.
DISABLE_INDEX = NO
# This tag can be used to set the number of enum values (range [1..20])
# that doxygen will group on one line in the generated HTML documentation.
ENUM_VALUES_PER_LINE = 4
# If the GENERATE_TREEVIEW tag is set to YES, a side panel will be
# generated containing a tree-like index structure (just like the one that
# is generated for HTML Help). For this to work a browser that supports
# JavaScript, DHTML, CSS and frames is required (for instance Mozilla 1.0+,
# Netscape 6.0+, Internet explorer 5.0+, or Konqueror). Windows users are
# probably better off using the HTML help feature.
GENERATE_TREEVIEW = NO
# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be
# used to set the initial width (in pixels) of the frame in which the tree
# is shown.
TREEVIEW_WIDTH = 250
#---------------------------------------------------------------------------
# configuration options related to the LaTeX output
#---------------------------------------------------------------------------
# If the GENERATE_LATEX tag is set to YES (the default) Doxygen will
# generate Latex output.
GENERATE_LATEX = NO
# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put.
# If a relative path is entered the value of OUTPUT_DIRECTORY will be
# put in front of it. If left blank `latex' will be used as the default path.
LATEX_OUTPUT = latex
# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be
# invoked. If left blank `latex' will be used as the default command name.
LATEX_CMD_NAME = latex
# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to
# generate index for LaTeX. If left blank `makeindex' will be used as the
# default command name.
MAKEINDEX_CMD_NAME = makeindex
# If the COMPACT_LATEX tag is set to YES Doxygen generates more compact
# LaTeX documents. This may be useful for small projects and may help to
# save some trees in general.
COMPACT_LATEX = NO
# The PAPER_TYPE tag can be used to set the paper type that is used
# by the printer. Possible values are: a4, a4wide, letter, legal and
# executive. If left blank a4wide will be used.
PAPER_TYPE = a4wide
# The EXTRA_PACKAGES tag can be to specify one or more names of LaTeX
# packages that should be included in the LaTeX output.
EXTRA_PACKAGES =
# The LATEX_HEADER tag can be used to specify a personal LaTeX header for
# the generated latex document. The header should contain everything until
# the first chapter. If it is left blank doxygen will generate a
# standard header. Notice: only use this tag if you know what you are doing!
LATEX_HEADER =
# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated
# is prepared for conversion to pdf (using ps2pdf). The pdf file will
# contain links (just like the HTML output) instead of page references
# This makes the output suitable for online browsing using a pdf viewer.
PDF_HYPERLINKS = NO
# If the USE_PDFLATEX tag is set to YES, pdflatex will be used instead of
# plain latex in the generated Makefile. Set this option to YES to get a
# higher quality PDF documentation.
USE_PDFLATEX = NO
# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \\batchmode.
# command to the generated LaTeX files. This will instruct LaTeX to keep
# running if errors occur, instead of asking the user for help.
# This option is also used when generating formulas in HTML.
LATEX_BATCHMODE = NO
# If LATEX_HIDE_INDICES is set to YES then doxygen will not
# include the index chapters (such as File Index, Compound Index, etc.)
# in the output.
LATEX_HIDE_INDICES = NO
#---------------------------------------------------------------------------
# configuration options related to the RTF output
#---------------------------------------------------------------------------
# If the GENERATE_RTF tag is set to YES Doxygen will generate RTF output
# The RTF output is optimised for Word 97 and may not look very pretty with
# other RTF readers or editors.
GENERATE_RTF = NO
# The RTF_OUTPUT tag is used to specify where the RTF docs will be put.
# If a relative path is entered the value of OUTPUT_DIRECTORY will be
# put in front of it. If left blank `rtf' will be used as the default path.
RTF_OUTPUT = rtf
# If the COMPACT_RTF tag is set to YES Doxygen generates more compact
# RTF documents. This may be useful for small projects and may help to
# save some trees in general.
COMPACT_RTF = NO
# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated
# will contain hyperlink fields. The RTF file will
# contain links (just like the HTML output) instead of page references.
# This makes the output suitable for online browsing using WORD or other
# programs which support those fields.
# Note: wordpad (write) and others do not support links.
RTF_HYPERLINKS = NO
# Load stylesheet definitions from file. Syntax is similar to doxygen's
# config file, i.e. a series of assigments. You only have to provide
# replacements, missing definitions are set to their default value.
RTF_STYLESHEET_FILE =
# Set optional variables used in the generation of an rtf document.
# Syntax is similar to doxygen's config file.
RTF_EXTENSIONS_FILE =
#---------------------------------------------------------------------------
# configuration options related to the man page output
#---------------------------------------------------------------------------
# If the GENERATE_MAN tag is set to YES (the default) Doxygen will
# generate man pages
GENERATE_MAN = NO
# The MAN_OUTPUT tag is used to specify where the man pages will be put.
# If a relative path is entered the value of OUTPUT_DIRECTORY will be
# put in front of it. If left blank `man' will be used as the default path.
MAN_OUTPUT = man
# The MAN_EXTENSION tag determines the extension that is added to
# the generated man pages (default is the subroutine's section .3)
MAN_EXTENSION = .3
# If the MAN_LINKS tag is set to YES and Doxygen generates man output,
# then it will generate one additional man file for each entity
# documented in the real man page(s). These additional files
# only source the real man page, but without them the man command
# would be unable to find the correct page. The default is NO.
MAN_LINKS = NO
#---------------------------------------------------------------------------
# configuration options related to the XML output
#---------------------------------------------------------------------------
# If the GENERATE_XML tag is set to YES Doxygen will
# generate an XML file that captures the structure of
# the code including all documentation. Note that this
# feature is still experimental and incomplete at the
# moment.
GENERATE_XML = NO
# The XML_OUTPUT tag is used to specify where the XML pages will be put.
# If a relative path is entered the value of OUTPUT_DIRECTORY will be
# put in front of it. If left blank `xml' will be used as the default path.
XML_OUTPUT = xml
# The XML_SCHEMA tag can be used to specify an XML schema,
# which can be used by a validating XML parser to check the
# syntax of the XML files.
XML_SCHEMA =
# The XML_DTD tag can be used to specify an XML DTD,
# which can be used by a validating XML parser to check the
# syntax of the XML files.
XML_DTD =
#---------------------------------------------------------------------------
# configuration options for the AutoGen Definitions output
#---------------------------------------------------------------------------
# If the GENERATE_AUTOGEN_DEF tag is set to YES Doxygen will
# generate an AutoGen Definitions (see autogen.sf.net) file
# that captures the structure of the code including all
# documentation. Note that this feature is still experimental
# and incomplete at the moment.
GENERATE_AUTOGEN_DEF = NO
#---------------------------------------------------------------------------
# configuration options related to the Perl module output
#---------------------------------------------------------------------------
# If the GENERATE_PERLMOD tag is set to YES Doxygen will
# generate a Perl module file that captures the structure of
# the code including all documentation. Note that this
# feature is still experimental and incomplete at the
# moment.
GENERATE_PERLMOD = NO
# If the PERLMOD_LATEX tag is set to YES Doxygen will generate
# the necessary Makefile rules, Perl scripts and LaTeX code to be able
# to generate PDF and DVI output from the Perl module output.
PERLMOD_LATEX = NO
# If the PERLMOD_PRETTY tag is set to YES the Perl module output will be
# nicely formatted so it can be parsed by a human reader. This is useful
# if you want to understand what is going on. On the other hand, if this
# tag is set to NO the size of the Perl module output will be much smaller
# and Perl will parse it just the same.
PERLMOD_PRETTY = YES
# The names of the make variables in the generated doxyrules.make file
# are prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX.
# This is useful so different doxyrules.make files included by the same
# Makefile don't overwrite each other's variables.
PERLMOD_MAKEVAR_PREFIX =
#---------------------------------------------------------------------------
# Configuration options related to the preprocessor
#---------------------------------------------------------------------------
# If the ENABLE_PREPROCESSING tag is set to YES (the default) Doxygen will
# evaluate all C-preprocessor directives found in the sources and include
# files.
ENABLE_PREPROCESSING = YES
# If the MACRO_EXPANSION tag is set to YES Doxygen will expand all macro
# names in the source code. If set to NO (the default) only conditional
# compilation will be performed. Macro expansion can be done in a controlled
# way by setting EXPAND_ONLY_PREDEF to YES.
MACRO_EXPANSION = NO
# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES
# then the macro expansion is limited to the macros specified with the
# PREDEFINED and EXPAND_AS_PREDEFINED tags.
EXPAND_ONLY_PREDEF = NO
# If the SEARCH_INCLUDES tag is set to YES (the default) the includes files
# in the INCLUDE_PATH (see below) will be search if a #include is found.
SEARCH_INCLUDES = YES
# The INCLUDE_PATH tag can be used to specify one or more directories that
# contain include files that are not input files but should be processed by
# the preprocessor.
INCLUDE_PATH =
# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
# patterns (like *.h and *.hpp) to filter out the header-files in the
# directories. If left blank, the patterns specified with FILE_PATTERNS will
# be used.
INCLUDE_FILE_PATTERNS =
# The PREDEFINED tag can be used to specify one or more macro names that
# are defined before the preprocessor is started (similar to the -D option of
# gcc). The argument of the tag is a list of macros of the form: name
# or name=definition (no spaces). If the definition and the = are
# omitted =1 is assumed.
PREDEFINED =
# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then
# this tag can be used to specify a list of macro names that should be expanded.
# The macro definition that is found in the sources will be used.
# Use the PREDEFINED tag if you want to use a different macro definition.
EXPAND_AS_DEFINED =
# If the SKIP_FUNCTION_MACROS tag is set to YES (the default) then
# doxygen's preprocessor will remove all function-like macros that are alone
# on a line, have an all uppercase name, and do not end with a semicolon. Such
# function macros are typically used for boiler-plate code, and will confuse the
# parser if not removed.
SKIP_FUNCTION_MACROS = YES
#---------------------------------------------------------------------------
# Configuration::addtions related to external references
#---------------------------------------------------------------------------
# The TAGFILES option can be used to specify one or more tagfiles.
# Optionally an initial location of the external documentation
# can be added for each tagfile. The format of a tag file without
# this location is as follows:
# TAGFILES = file1 file2 ...
# Adding location for the tag files is done as follows:
# TAGFILES = file1=loc1 "file2 = loc2" ...
# where "loc1" and "loc2" can be relative or absolute paths or
# URLs. If a location is present for each tag, the installdox tool
# does not have to be run to correct the links.
# Note that each tag file must have a unique name
# (where the name does NOT include the path)
# If a tag file is not located in the directory in which doxygen
# is run, you must also specify the path to the tagfile here.
TAGFILES =
# When a file name is specified after GENERATE_TAGFILE, doxygen will create
# a tag file that is based on the input files it reads.
GENERATE_TAGFILE =
# If the ALLEXTERNALS tag is set to YES all external classes will be listed
# in the class index. If set to NO only the inherited external classes
# will be listed.
ALLEXTERNALS = NO
# If the EXTERNAL_GROUPS tag is set to YES all external groups will be listed
# in the modules index. If set to NO, only the current project's groups will
# be listed.
EXTERNAL_GROUPS = YES
# The PERL_PATH should be the absolute path and name of the perl script
# interpreter (i.e. the result of `which perl').
PERL_PATH = /usr/bin/perl
#---------------------------------------------------------------------------
# Configuration options related to the dot tool
#---------------------------------------------------------------------------
# If the CLASS_DIAGRAMS tag is set to YES (the default) Doxygen will
# generate a inheritance diagram (in HTML, RTF and LaTeX) for classes with base or
# super classes. Setting the tag to NO turns the diagrams off. Note that this
# option is superceded by the HAVE_DOT option below. This is only a fallback. It is
# recommended to install and use dot, since it yields more powerful graphs.
CLASS_DIAGRAMS = YES
# If set to YES, the inheritance and collaboration graphs will hide
# inheritance and usage relations if the target is undocumented
# or is not a class.
HIDE_UNDOC_RELATIONS = NO
# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is
# available from the path. This tool is part of Graphviz, a graph visualization
# toolkit from AT&T and Lucent Bell Labs. The other options in this section
# have no effect if this option is set to NO (the default)
HAVE_DOT = @HAVE_DOT@
# If the CLASS_GRAPH and HAVE_DOT tags are set to YES then doxygen
# will generate a graph for each documented class showing the direct and
# indirect inheritance relations. Setting this tag to YES will force the
# the CLASS_DIAGRAMS tag to NO.
CLASS_GRAPH = YES
# If the COLLABORATION_GRAPH and HAVE_DOT tags are set to YES then doxygen
# will generate a graph for each documented class showing the direct and
# indirect implementation dependencies (inheritance, containment, and
# class references variables) of the class with other documented classes.
COLLABORATION_GRAPH = NO
# If the UML_LOOK tag is set to YES doxygen will generate inheritance and
# colloborations diagrams in a style similiar to the OMG's Unified Modeling
# Language.
UML_LOOK = NO
# If set to YES, the inheritance and collaboration graphs will show the
# relations between templates and their instances.
TEMPLATE_RELATIONS = YES
# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDE_GRAPH, and HAVE_DOT
# tags are set to YES then doxygen will generate a graph for each documented
# file showing the direct and indirect include dependencies of the file with
# other documented files.
INCLUDE_GRAPH = NO
# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDED_BY_GRAPH, and
# HAVE_DOT tags are set to YES then doxygen will generate a graph for each
# documented header file showing the documented files that directly or
# indirectly include this file.
INCLUDED_BY_GRAPH = NO
# If the CALL_GRAPH and HAVE_DOT tags are set to YES then doxygen will
# generate a call dependency graph for every global function or class method.
# Note that enabling this option will significantly increase the time of a run.
# So in most cases it will be better to enable call graphs for selected
# functions only using the \callgraph command.
CALL_GRAPH = NO
# If the GRAPHICAL_HIERARCHY and HAVE_DOT tags are set to YES then doxygen
# will graphical hierarchy of all classes instead of a textual one.
GRAPHICAL_HIERARCHY = YES
# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images
# generated by dot. Possible values are png, jpg, or gif
# If left blank png will be used.
DOT_IMAGE_FORMAT = png
# The tag DOT_PATH can be used to specify the path where the dot tool can be
# found. If left blank, it is assumed the dot tool can be found on the path.
DOT_PATH =
# The DOTFILE_DIRS tag can be used to specify one or more directories that
# contain dot files that are included in the documentation (see the
# \dotfile command).
DOTFILE_DIRS =
# The MAX_DOT_GRAPH_WIDTH tag can be used to set the maximum allowed width
# (in pixels) of the graphs generated by dot. If a graph becomes larger than
# this value, doxygen will try to truncate the graph, so that it fits within
# the specified constraint. Beware that most browsers cannot cope with very
# large images.
MAX_DOT_GRAPH_WIDTH = 800
# The MAX_DOT_GRAPH_HEIGHT tag can be used to set the maximum allows height
# (in pixels) of the graphs generated by dot. If a graph becomes larger than
# this value, doxygen will try to truncate the graph, so that it fits within
# the specified constraint. Beware that most browsers cannot cope with very
# large images.
MAX_DOT_GRAPH_HEIGHT = 800
# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the
# graphs generated by dot. A depth value of 3 means that only nodes reachable
# from the root by following a path via at most 3 edges will be shown. Nodes that
# lay further from the root node will be omitted. Note that setting this option to
# 1 or 2 may greatly reduce the computation time needed for large code bases. Also
# note that a graph may be further truncated if the graph's image dimensions are
# not sufficient to fit the graph (see MAX_DOT_GRAPH_WIDTH and MAX_DOT_GRAPH_HEIGHT).
# If 0 is used for the depth value (the default), the graph is not depth-constrained.
MAX_DOT_GRAPH_DEPTH = 0
# If the GENERATE_LEGEND tag is set to YES (the default) Doxygen will
# generate a legend page explaining the meaning of the various boxes and
# arrows in the dot generated graphs.
GENERATE_LEGEND = YES
# If the DOT_CLEANUP tag is set to YES (the default) Doxygen will
# remove the intermediate dot files that are used to generate
# the various graphs.
DOT_CLEANUP = YES
#---------------------------------------------------------------------------
# Configuration::addtions related to the search engine
#---------------------------------------------------------------------------
# The SEARCHENGINE tag specifies whether or not a search engine should be
# used. If set to NO the values of all tags below this one will be ignored.
SEARCHENGINE = NO
# The CGI_NAME tag should be the name of the CGI script that
# starts the search engine (doxysearch) with the correct parameters.
# A script with this name will be generated by doxygen.
CGI_NAME = search.cgi
# The CGI_URL tag should be the absolute URL to the directory where the
# cgi binaries are located. See the documentation of your http daemon for
# details.
CGI_URL =
# The DOC_URL tag should be the absolute URL to the directory where the
# documentation is located. If left blank the absolute path to the
# documentation, with file:// prepended to it, will be used.
DOC_URL =
# The DOC_ABSPATH tag should be the absolute path to the directory where the
# documentation is located. If left blank the directory on the local machine
# will be used.
DOC_ABSPATH =
# The BIN_ABSPATH tag must point to the directory where the doxysearch binary
# is installed.
BIN_ABSPATH = /usr/local/bin/
# The EXT_DOC_PATHS tag can be used to specify one or more paths to
# documentation generated for other projects. This allows doxysearch to search
# the documentation for these projects as well.
EXT_DOC_PATHS =

15
mrw/exception.cpp Normal file
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#include <mrw/exception.hpp>
#include <mrw/stacktrace.hpp>
namespace mrw {
exception::exception() throw(std::bad_exception):
_stacktrace(new StackTrace) {
}
exception::~exception() throw() {
delete _stacktrace;
}
const std::string& exception::stacktrace() const throw(std::bad_exception) {
static const std::string st(*_stacktrace);
return st;
}
}

170
mrw/exception.hpp Normal file
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#ifndef __MRW_EXCEPTION_HPP__
#define __MRW_EXCEPTION_HPP__
#include <exception>
#include <string>
namespace mrw {
class StackTrace;
/** @addtogroup StackTrace
@section exc Exception Handling with Stack Trace
One of the main reasons for the mrw::StackTrace class is, to be
able to store a trace where an exception is thrown. This trace
is then stored as exception information, but not yet evaluated,
symbols are calculated only if necessary, upon request. So the
exception is still relatively cheap.
There is a class named mrw::exception that derieves from and
behaves as @c std::exception, but it stores a mrw::StackTrace on
construction and offers a method @c mrw::exception::stacktrace()
that returns a well formatted stack trace of the point, where
the exception was created.
@subsection excprob Common Problems with Exception Handling
Exceptions are very handy: When you have a problem, you throw an
exception and when you call a method and reach the next line,
everything was fine. You don't have to care about error handling
unless you are able to handle it. Otherwise you simply let pass
any exception up in the stack.
The big disadvantage is, when you catch an exception, you don't
know where it was thrown. That's the stack trace for. Another
problem is, the exception specification problem: When you don't
write exception specifications, you don't know what a specific
method throws. If you do write exception specifications, they
are not checked at compile time, but enforced at run time. If a
wrong exception is thrown, the program stops, calls an
unexpected handler that by default aborts the program. Since the
unexpected handler must not return, the problem cannot be
recovered from. But the unexpected handler can rethrow and catch
the bad exception and it is allowed to throw a new
exception. This is what my suggested exception handling concept
makes use of.
@subsection excsug Suggested Exception Handling Rules
-# derieve all your exceptions from mrw::exception
-# write exception specifications as follows:
- if any exception is thrown, specify @c throw(mrw::exception)
- if no exception is thrown, specify @c throw(std::bad_exception)
-# document the exact exception thrown with Doxygen's \@throw tag
-# write an unexpected handler as follows:
@code
void unexpectedHandler() {
try {
throw;
} catch (mrw::exception& x) {
// trace x.stacktrace() and x.what()
} catch (std::exception& x) {
// trace x.what()
} catch (...) {
// trace unknown unexpected
}
throw std::bad_exception(); // try to recover
}
@endcode
What happens:
- If you throw an exception in a method that declares not to
throw an exception, the unexpected handler is called.
- It writes a stack trace for you to be able to find your bug.
- Then it throws a @c std::bad_exception, which is allowed to pass.
- Your program does not abort, but continues running.
- If higher in the stack you catch the exception, you may be
able to recover.
- If you throw an exception where you are allowed to, you only need to
catch mrw::exception and you can access @c what() and @c stacktrace().
For a proof of concept refer to
@ref exceptionhandling.cpp "the example exceptionhandling.cpp".
*/
//@{
/** @example exceptionhandling.cpp
It is possible to recover from an unexpected exception! A stack
trace helps you to find the source of a problem, here function
@c fn2() in file @c /privat/home/marc/pro/mrw-c++/mrw/test.cpp
on line @c 25. This example produces the following output:
@verbatim
call fn0
enter fn0
enter fn1
enter fn2
UNEXPECTED:N3mrw9exceptionE
---------------------------Stack:
[0x8049e51] ../sysdeps/i386/elf/start.S:105 _start
[0x401cfd3e] ????:0 ????
[0x804a3d0] examples/exceptionhandling.cpp:50 main
[0x804a2a3] examples/exceptionhandling.cpp:38 fn0()
[0x804a227] examples/exceptionhandling.cpp:32 fn1()
[0x804a1c1] examples/exceptionhandling.cpp:25 fn2()
[0x804fdda] ../mrw/exception.cpp:6 mrw::exception::exception()
[0x804a8f5] ../mrw/stacktrace.cpp:54 mrw::StackTrace::StackTrace()
---------------------------------
EXCEPTION caught in fn0:St13bad_exception
leave fn0
call of fn0 successful
@endverbatim
Please note, that without the exception concept and without the
unexpected handler, the program would abort in function fn2 on
line 25. The output was produced by the following code:
*/
/** @brief replacement for @c std::exception, that collects a stack trace
This exception class behaves exactely like @c std::exception,
but it collects a stack trace in the constructor and offers a
method to return the formatted stack trace for logging.
It is recommended, to inherit all the exceptions you ever throw
from this class. This way you can always access the stack trace
if you run into troubles. It is fursther recommended, to write a
unexpected handler, that rethrows, catches this exception, then
throws a @c std::bad_exception to try to continue. This is the
reason, why all the exception specifications in the MRW C++
Library declar @c throw(std::bad_exception) instead of @c
throw(), when they throw nothing.
@code
namespace myProject {
void unexpectedHandler() {
try {
throw;
} catch (mrw::exception& x) {
// trace x.stacktrace() and x.what()
} catch (std::exception& x) {
// trace x.what()
} catch (...) {
// trace unknown unexpected
}
throw std::bad_exception(); // try to recover
}
}
int main() {
std::set_unexpected(&myProject::unexpectedHandler);
...
}
@endcode
*/
class exception: public std::exception {
public:
exception() throw(std::bad_exception);
virtual ~exception() throw();
const std::string& stacktrace() const throw(std::bad_exception);
private:
StackTrace* _stacktrace;
};
//@}
}
#endif

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#include <mrw/exec.hpp>
#include <mrw/unistd.hpp>
#include <sys/wait.h> // waitpid
#include <unistd.h> // fork, exec
#include <string.h> // memcpy
#include <iostream>
mrw::ExecutionFailedExc::ExecutionFailedExc(const std::string& w,
const std::string& c)
throw(std::bad_exception):
_what(std::string("mrw::Exec: command execution failed\n")+
std::string(" failed command was: \""+c+"\"\n")+
std::string(" error was: \"")+w+'"') {
/**
@c what looks like:
@verbatim
mrw::Exec: command execution failed
failed command was: "/bin/OOOOPS -v -q --crash"
error was: "execution failed"
@endverbatim
*/
}
mrw::Cmd::Cmd(const std::string& c) throw(std::bad_exception) {
_cmd.push_back(c);
}
mrw::Cmd& mrw::Cmd::operator,(const std::string& arg)
throw(std::bad_exception) {
_cmd.push_back(arg);
return *this;
}
mrw::Cmd& mrw::Cmd::operator<<(const std::string& arg)
throw(std::bad_exception) {
_cmd.push_back(arg);
return *this;
}
mrw::Cmd::operator std::string() const throw(std::bad_exception) {
ArgList::const_iterator it(_cmd.begin());
std::string c(*it);
while (++it!=_cmd.end()) c+=' '+*it;
return c;
}
mrw::Cmd::operator mrw::Exec() const throw(std::bad_exception) {
return mrw::Exec(*this);
}
mrw::Exec mrw::Cmd::execute(bool throwExc) const throw(mrw::exception) {
return mrw::Exec(*this).execute(throwExc);
}
const char* mrw::Cmd::path() const throw(std::bad_exception) {
return _cmd.front().c_str();
}
char** mrw::Cmd::args() const throw(std::bad_exception) {
if (_cmd.size()==0) return 0;
char** array = new char*[_cmd.size()+1];
int i(0);
for (ArgList::const_iterator it(_cmd.begin()); it!=_cmd.end(); ++it)
memcpy(array[i++]=new char[it->size()+1], it->c_str(), it->size()+1);
array[i] = 0;
return array;
}
mrw::Exec::Exec(const mrw::Cmd& c) throw(std::bad_exception):
_cmd(new mrw::Cmd(c)), _success(false) {
}
mrw::Exec::Exec(const mrw::Exec& e) throw(std::bad_exception):
_cmd(new mrw::Cmd(*e._cmd)),
_res(e._res), _err(e._err), _success(e._success) {
}
mrw::Exec::~Exec() throw() {
delete _cmd;
}
mrw::Exec& mrw::Exec::operator=(const mrw::Exec& e) throw(std::bad_exception) {
if (this==&e) return *this;
*_cmd=*e._cmd; _res=e._res; _err=e._err; _success=e._success;
return *this;
}
mrw::Exec& mrw::Exec::execute(bool throwExc) throw(mrw::exception) {
/** This method calls @c fork, sets up a pipe connection to pass @c
stdot and @c stderr from the child process to the parent process
using mrw::pipe and calls @c execvp to execute the program. */
_success = false;
_res = _err = "";
mrw::pipe stdout, stderr;
if (!stdout || !stderr)
throw mrw::ExecutionFailedExc("cannot create pipe", *_cmd);
pid_t pid(fork());
if (pid<0)
throw ExecutionFailedExc("cannot fork", *_cmd);
if (pid) { // parent
stdout.close_out();
stderr.close_out();
if (!stdout || !stderr)
throw ExecutionFailedExc("cannot close pipe", *_cmd);
int num1(0), num2(0);
for (char buf1[4096], buf2[4096];
(num1=read(stdout.istream(), buf1, sizeof(buf1)))>0 ||
num1==-1 && errno==EINTR ||
(num2=read(stderr.istream(), buf2, sizeof(buf2)))>0 ||
num2==-1 && errno==EINTR;
_res += std::string(buf1, num1), _err += std::string(buf2, num2));
if (num1==-1 || num2==-1)
throw ExecutionFailedExc("cannot_ read pipe", *_cmd);
// wait for child to get return code
int s(0);
if (waitpid(pid, &s, 0)!=pid || WIFEXITED(s)!=0 && WEXITSTATUS(s)!=0) {
if (throwExc) {
throw ExecutionFailedExc("execution failed", *_cmd);
} else {
_success = false;
return *this;
}
}
} else { // child
stdout.close_in();
stderr.close_in();
stdout.connect_cout();
stderr.connect_cerr();
execvp(_cmd->path(), _cmd->args());
exit(1); // execute failed
}
_success = true;
return *this;
}
mrw::Exec& mrw::Exec::operator>>(std::string& res) throw(mrw::exception) {
execute();
res += _res;
return *this;
}
mrw::Exec::operator std::string&() throw(mrw::exception) {
if (!_success) execute();
return _res;
}
mrw::Exec::operator bool() throw(std::bad_exception) {
return _success;
}
std::string& mrw::Exec::result() throw(mrw::exception) {
if (!_success) execute();
return _res;
}
std::string& mrw::Exec::error() throw(mrw::exception) {
if (!_success) execute();
return _err;
}
bool mrw::Exec::success() throw(std::bad_exception) {
return _success;
}

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#ifndef __MRW_EXEC_HPP__
#define __MRW_EXEC_HPP__
#include <string>
#include <list>
#include <mrw/exception.hpp>
namespace mrw {
/** @defgroup CmdExec Execute UNIX Commands
There is no easy way to safely execute UNIX commands and to
return the output of the callee to the caller. @c system ist
first of all known to be unsafe, because it opens a shell, and
second there is no way to transfer the output back to the
caller. On the other hand, starting a new process with @c fork
and @c exec and passing the output of the callee to the caller
using pipes is quite complex and needs much more than one simple
line of code. This is the gap that is filled with this command
execution classes. There's a class for the command to be
executed and a class for the execution of the command.
Forking a subprocess and evaluating the result becomes so easy:
@code
try {
// execute the command: /bin/ls -l /tmp
mrw::Exec ls =
(mrw::Cmd("/bin/ls"), "-l", "/tmp").execute(false);
// evaluate the result
if (ls.success())
std::cout<<"Execution successful, result was:"<<std::endl;
else
std::cerr<<"Error in execution, error was:"<<std::endl;
std::cout<<ls.result()<<std::endl;
std::cerr<<ls.error()<<std::endl;
} catch (ExecutionFailedExc& x) {
// a fatal execution error occurred
// you can trace x.what() and x.stacktrace()
}
@endcode
*/
//@{
class Cmd;
/** @brief Exception: Execution of command failed.
This exception is thrown, if the exection of a command in
mrw::Exec is failed. That means, it was not possible to fork or
to create the necessary pipes, or the command executing process
terminated with an error. In the last case, you can access the
error stream from @c stderr respectively @c cerr with method
mrw::Exec::error().
*/
class ExecutionFailedExc: public mrw::exception {
public:
ExecutionFailedExc(const std::string&, const std::string&)
throw(std::bad_exception);
virtual ~ExecutionFailedExc() throw() {}
virtual const char* what() const throw() {return _what.c_str();}
private:
std::string _what;
};
/** @brief Execute a command in a new process.
This class handles the execution of a command in a new process
and returns the two streams @c cout and @cerr, also known as @c
stderr and @stdout.
There are different ways of usage for this class. A simple way,
one line of code, to get only the resulting stream (no error)
is:
@code
string stdout =
(mrw::Cmd("/bin/ls"), "-l", "/tmp").execute(false).result();
@endcode
If you need not only the resulting @c stdout stream, but also
the error stream @c stderr, then you need to store the result:
@code
mrw::Exec ls =
(mrw::Cmd("/bin/ls"), "-l", "/tmp").execute(false);
if (!ls) ...; // command termianted with error
// ls.result() contains stdout
// ls.error() contains stderr
@endcode
@note Please note that the command execution may throw an exception.
*/
class Exec {
public:
/** @brief Create an executor given a command.
Construction without passing a command is not possible. */
Exec(const mrw::Cmd&) throw(std::bad_exception);
Exec(const mrw::Exec&) throw(std::bad_exception);
~Exec() throw();
Exec& operator=(const mrw::Exec&) throw(std::bad_exception);
/** @brief Execute the command.
@param bool
- @c true throw an exception if return status is not zero
- @c false throw only an exception in case of a fatal error
@throw ExecutionFailedExc is thrown if
- fork fails
- creation or setup of pipes failed
- if given parameter is @c true (the default) also if the
executed program terminates with an error
*/
Exec& execute(bool=true) throw(mrw::exception);
/** @brief Executes the command if not done, streams @c stdout into a string
If the command has not yet been executed successfully, it is
first executed, then the @c stdout output of the called
program is appended to the string.
@throw ExecutionFailedExc in case of any failure or if the
executed program does not return a zero exit status.
*/
Exec& operator>>(std::string&) throw(mrw::exception);
/** @brief Executes the command if not done, returns @c stdout as string
If the command has not yet been executed successfully, it is
first executed, then the @c stdout output of the called
program is returned.
@return @c stdout of the called program
@throw ExecutionFailedExc in case of any failure or if the
executed program does not return a zero exit status.
*/
operator std::string&() throw(mrw::exception);
/** @return
- @c true if the last execution was successful
- @c false if the last execution failed or the command was
never executed
*/
operator bool() throw(std::bad_exception);
/** @brief Executes the command if not done, returns @c stdout as string
If the command has not yet been executed successfully, it is
first executed, then the @c stdout output of the called
program is returned.
@return @c stdout of the called program
@throw ExecutionFailedExc in case of any failure or if the
executed program does not return a zero exit status.
*/
std::string& result() throw(mrw::exception);
/** @brief Executes the command if not done, returns @c stderr as string
If the command has not yet been executed successfully, it is
first executed, then the @c stderr error output of the called
program is returned.
@return @c stderr of the called program
@throw ExecutionFailedExc in case of any failure or if the
executed program does not return a zero exit status.
*/
std::string& error() throw(mrw::exception);
/** @return
- @c true if the last execution was successful
- @c false if the last execution failed or the command was
never executed
*/
bool success() throw(std::bad_exception);
private:
Exec(); // no default constructor
mrw::Cmd* _cmd;
std::string _res, _err;
bool _success;
};
/** @brief A system command to be executed
This class is used in conjunction with mrw::Exec. It mus be
initialized with the command name, then the command parameters
are appended either with commas, or by streaming them into the
command, whatever you like.
You can stream the data into the class:
@code
mrw::Cmd ls("/bin/ls"); // the command to execute is: /bin/ls
ls<<"-l"<<"/tmp"; // the command is now: /bin/ls -l /tmp
@endcode
Or you can setup your command with commas:
@code
mrw::Cmd ls = (mrw::Cmd(/bin/ls), "-l", "/tmp");
@endcode
*/
class Cmd {
public:
/** @brief Create a command given the name of the executable
@param std::string the name of the program to execute (no parameter)
@note There is no default constructor. */
Cmd(const std::string&) throw(std::bad_exception);
/** @brief Append a parameter to a command
@param std::string a parameter&nbsp;/ commandline argument
to append to the command */
Cmd& operator,(const std::string&) throw(std::bad_exception);
/** @brief Append a parameter to a command
@param std::string a parameter&nbsp;/ commandline argument
to append to the command */
Cmd& operator<<(const std::string&) throw(std::bad_exception);
/** @return the command including parameter */
operator std::string() const throw(std::bad_exception);
/** @return a mrw::Exec that's constructed with this class */
operator Exec() const throw(std::bad_exception);
/** @brief Create a mrw::Exec and execute the command
Creates a mrw::Exec, executes the command, passes the flag to
mrw::Exec::execute() and returns the created mrw::Exec. The
result of the execution can be retrieved through the returned
mrw::Exec object: The methods mrw::Exec::success(),
mrw::Exec::result() and mrw::Exec::error() provide the
necessary information.
@param bool
- @c true throw an exception if return status is not zero
- @c false throw only an exception in case of a fatal error
@return the mrw::Exec that has executed the command
@throw ExecutionFailedExc is thrown if
- fork fails
- creation or setup of pipes failed
- if given parameter is @c true (the default) also if the
executed program terminates with an error
*/
Exec execute(bool=true) const throw(mrw::exception);
private:
friend class Exec; // is allowed to call path() and args()
Cmd(); // no default constructor
const char* path() const throw(std::bad_exception);
char** args() const throw(std::bad_exception);
typedef std::list<std::string> ArgList;
ArgList _cmd;
};
//@}
}
#endif

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#include <mrw/exec.hpp>
#include <mrw/stacktrace.hpp>
#include <iostream>
int main() {
// std::cout<<"RESULT: "
// <<(mrw::Cmd("/bin/ls"), "-l", "/tmp").execute().result()
// <<std::endl;
try {
std::cout<<"RESULT: "
<<(mrw::Cmd("/bin/false")).execute().result()
<<std::endl;
} catch (const mrw::exception &x) {
mrw::StackTrace::createSymtable();
std::cout<<"EXCEPTION: ----------------------------------------"<<std::endl
<<"---------- Reason:"<<std::endl
<<x.what()<<std::endl
<<"---------- Stack:"<<std::endl
<<x.stacktrace()<<std::endl
<<"---------------------------------------------------"<<std::endl;
}
}

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EXTRA_DIST = doc examples
CLEANFILES = doxygen.err
lib_LTLIBRARIES = libmrw.la libautostacktracestderr.la
libmrw_la_SOURCES = mrw.hpp \
auto.hpp auto.cpp unistd.hpp \
stacktrace.hpp stacktrace.cpp exception.hpp \
exec.hpp exec.cpp
libmrw_la_LDFLAGS = -version-info @MAJOR@:@MINOR@:@SUPPORT@
libautostacktracestderr_la_SOURCES = autostacktracestderr.cpp
libautostacktracestderr_la_LDFLAGS = -version-info @MAJOR@:@MINOR@:@SUPPORT@
doc: doc/html/index.html
doc/html/index.html: doxyfile *.[ch]pp
doxygen doxyfile

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/** @mainpage
@section license License and Copyright
- All files are under GNU LGPL license.
- All files are copyrighted by Marc Wäckerlin.
- There is no warranty.
- For details, read the file LICENSE in your distribution.
@section intro Introduction
This library cares a about:
- resource management
- execution of UNIX sub processes
- stack trace
- exception handling
For details, see the modules page.
@section link Compile and Link Options
To be able to get the source file name&nbsp;/ line number
information in stack trace, you need the debug information compile
option @c -g. For compilation on Solaris, you may need the option
@c -D__solaris__. You must link to the MRW C++ Library. For this
you need the link option @c -lmrw.
@section download Download and Installation
Download the latest version from:
- http://marc.waeckerlin.org/c++/libmrw
Install it with:
@verbatim
tar xzvf mrw-c++-<VERSION>.tar.gz
cd mrw-c++-<VERSION>
./configure
make all check install
@endverbatim
*/

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#include <mrw/stacktrace.hpp>
#include <sstream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <assert.h>
#include <math.h>
#include <algorithm>
#include <list>
#if defined(__solaris__)
#include <sys/old_procfs.h>
#endif
#if defined (__GLIBC__)
#include <execinfo.h>
#endif
#include <bfd.h>
extern "C" {
#include <demangle.h>
}
#include <iomanip>
namespace mrw {
//----------------------------------------------------------------------------
std::string demangle(bfd* abfd, const char* name) {
if (bfd_get_symbol_leading_char(abfd) == name[0]) ++name;
/* This is a hack for better error reporting on XCOFF, PowerPC64-ELF
or the MS PE format. These formats have a number of leading '.'s
on at least some symbols, so we remove all dots to avoid
confusing the demangler. */
const char* p (name);
while (p && *p == '.') ++p;
mrw::AutoFree<char> res(cplus_demangle(p, DMGL_ANSI | DMGL_PARAMS));
if (res) {
/* Now put back any stripped dots. */
if (p==name) return (char*)res;
std::string add_dots('.', p-name);
return add_dots+=(char*)res;
}
return name;
}
//----------------------------------------------------------------------------
StackTrace::StackTrace() throw(std::bad_exception) {
// maximum trace level is limited here to 50, see below why
# if defined(__GLIBC__)
{
const int TRACE_LEVEL(50);
void* ba[TRACE_LEVEL];
for (int n(backtrace(ba, TRACE_LEVEL)), i(0); i<n; ++i)
_trace.push_back(ba[i]);
}
# elif defined(__GNUG__)
{
# define push(i) \
(__builtin_return_address(i) ? \
(_trace.push_back(__builtin_return_address(i)), true) : false)
push(0) && push(1) && push(2) && push(3) && push(4) && push(5) &&
push(6) && push(7) && push(8) && push(9) && push(10) && push(11) &&
push(12) && push(13) && push(14) && push(15) && push(16) && push(17)
&& push(18) && push(19) && push(20) && push(21) && push(22) &&
push(23) && push(24) && push(25) && push(26) && push(27) && push(28)
&& push(29) && push(30) && push(31) && push(32) && push(33) &&
push(34) && push(35) && push(36) && push(37) && push(38) && push(39)
&& push(40) && push(41) && push(42) && push(43) && push(44) &&
push(45) && push(46) && push(47) && push(48) && push(49);
# undef push
}
# else
# warning "You need GNU gcc or GNU glibc to be able to use mrw::StackTrace"
# endif
}
//----------------------------------------------------------------------------
StackTrace::operator std::string() const throw(std::bad_exception) {
static const double LN10(log(10));
std::stringstream s;
bool first(true);
unsigned int lisz(0), fisz(0);
std::list<CodePos> l;
for (AddressTrace::const_reverse_iterator it(_trace.rbegin());
it!=_trace.rend(); ++it, first=false) {
CodePos c(translate(*it));
if (log(c.line+1)/LN10 > lisz) lisz = (unsigned int)(log(c.line+1)/LN10);
if (c.file.size() > fisz) fisz = c.file.size();
l.push_back(c);
}
for (std::list<CodePos>::iterator it(l.begin()); it!=l.end(); ++it)
s<<"["<<it->address<<"] "
<<it->file<<':'<<it->line
<<std::setw(fisz+lisz-it->file.size()-
(unsigned int)(log(it->line+1)/LN10)-1)
<<" "<<it->function<<std::endl;
return s.str();
}
//----------------------------------------------------------------------------
const StackTrace& StackTrace::print(std::ostream& os) const
throw(std::bad_exception) {
os<<(std::string)*this;
return *this;
}
//----------------------------------------------------------------------------
StackTrace::CodePos StackTrace::translate(void* addr)
throw(std::bad_exception) {
assert(sizeof(bfd_vma)>=sizeof(void*));
bfd_vma vma_addr(reinterpret_cast<bfd_vma>(addr));
if (!_dic.get()) return CodePos(addr, "????", "????", 0);
std::vector<Translator::key_type>::iterator
it(std::lower_bound(_addrs.begin(), _addrs.end(), vma_addr));
if (it--==_addrs.begin() || *it > vma_addr ||
(*_dic)[*it].first <= vma_addr) return CodePos(addr, "????", "????", 0);
static const char* file(0);
static const char* function(0);
unsigned int line;
if (!bfd_find_nearest_line(_bfd, (*_dic)[*it].second, _syms.get(),
vma_addr-*it, &file, &function, &line))
return CodePos(addr, "????", "????", 0);
return CodePos(addr, mrw::demangle(_bfd, function), file?file:"????", line);
}
//----------------------------------------------------------------------------
bool StackTrace::createSymtable(std::string fname) throw(std::bad_exception) {
if (_dic.get()) return true;
AutoBfd abfd(bfd_openr((fname!="" ? fname : filename()).c_str(), 0));
long memsz(-1);
AutoFree<char*> m(0);
if (!abfd || bfd_check_format(abfd, bfd_archive) ||
!bfd_check_format_matches(abfd, bfd_object, m) ||
!(bfd_get_file_flags(abfd)&HAS_SYMS) ||
(memsz=bfd_get_symtab_upper_bound(abfd))<0) return false;
std::auto_ptr<asymbol*> syms(new asymbol*[memsz]);
if (bfd_canonicalize_symtab(abfd, syms.get())<0) return false;
_bfd = abfd;
_syms = syms;
_dic = std::auto_ptr<Translator>(new Translator());
bfd_map_over_sections(_bfd, buildSectionMap, 0);
std::sort(_addrs.begin(), _addrs.end());
return true;
}
//----------------------------------------------------------------------------
std::string StackTrace::filename() throw(std::bad_exception) {
std::stringstream s;
s<<"/proc/"<<getpid();
# if defined(__solaris__)
{
std::string res;
AutoFile fd(open(s.str().c_str(), O_RDONLY));
prpsinfo_t status;
if (fd==-1 || ioctl(fd, PIOCPSINFO, &status)==-1) return res;
res = status.pr_psargs;
res = res.substr(0, res.find(' '));
return res;
}
# elif defined(__linux__)
{
s<<"/exe";
return s.str();
}
# else
# warning "Don't know how to get executable file name in your system!"
# warning "Impossible to get function names in stack trace!"
# warning "Give the path to the executable to StackTrace::createSymtable!"
# endif
}
//----------------------------------------------------------------------------
void StackTrace::buildSectionMap(bfd* abfd, asection* section, void*)
throw(std::bad_exception) {
if (!(bfd_get_section_flags(abfd, section)&SEC_ALLOC)) return;
bfd_vma vma(bfd_get_section_vma(abfd, section));
bfd_size_type sz(bfd_get_section_size_before_reloc(section));
(*_dic)[vma] = Translator::mapped_type(vma+sz, section);
_addrs.push_back(vma);
}
//----------------------------------------------------------------------------
std::auto_ptr<StackTrace::Translator> StackTrace::_dic;
std::vector<StackTrace::Translator::key_type> StackTrace::_addrs;
AutoBfd StackTrace::_bfd;
std::auto_ptr<asymbol*> StackTrace::_syms;
}

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// g++ -Wall -D__SOLARIS__ -g -I /home/public/freeware/include -L /home/public/freeware/lib -I . stacktrace.cxx -lbfd -liberty
#ifndef __MRW_STACKTRACE_HPP__
#define __MRW_STACKTRACE_HPP__
#include <mrw/auto.hpp>
#include <vector>
#include <map>
#include <string>
#include <memory>
#include <sys/mman.h>
#include <bfd.h>
#ifdef __REENTRANT
#warning "mrw::StackTrace is not thread safe yet!"
#warning "It should work, but is at least untested..."
#endif
namespace mrw {
/** @defgroup StackTrace Collect and Format a Stack Trace
Somewhere in a program, there is a fatal error, e.g. an
unexpected exception is thrown. How is it possible to debug the
problem in such a case? Sometimes you can start a debugger and
trace the execution of your program. But what if it occurs only
once a week, or if you cannot set a breakpoint, because you
don't know where the problem is located, or because only the
1000th run of a method causes a problem, or what if the problem
occurs only at your customers installation?
One way to solve these problems is to do logging, or even
function tracing, so you can narrow down the lines of code,
where the problem occurs. But sometimes this is not enough,
especially with exceptions. One of the worst things with
exceptions is, you can catch an exception somewhere, but you
don't know where it was thrown. Here it is very handy, to be
able to write a stacktrace to a logging device.
For logging, I recommend log4cxx on page:
- http://logging.apache.org/log4cxx
These classes are for collecting a stack trace and later for
formatting with source code file name, line number and the
method name.
For collecting the stack trace (the addresses):
- either the GNU gcc compiler is required
- or the GNU glibc library function @c backtrace
For extracting information from an address, the ELF library is required.
@note For all features and full operation, this class requires:
- either a GNU glibc bases system (LINUX), or the GNU gcc compiler
- a system with ELF binaries (LINUX, Solaris, ...)
- debug information, compile option @c -g
- it must be linked with @c -libery and @c -lbfd
*/
//@{
/** @brief store and print a stack trace of the actual position in code
In the constructor, a stack trace is stored, but not yet
evaluated. Therefore storing a stack trace is relatively
fast. The evaluation is done when the stack trace is printed on
a stream or converted to a string. "Evaluation" means, that the
addresses are mapped to the correspoding symbols, the method
names, sorce file names and line numbers are evaluated.
@note Method StackTrace::createSymtable must be called exactely
once, before evaluating the first stack trace.Best place is the
first line of the @c main function.
@note This class requires libbfd an libiberty. Debug information
is required for compiling. You nee the compile option @c -g, or
even better @c -ggdb3. To link, you need @c -lmrw, @c -lbfd and
@c -liberty.
@note The stack trace is known to work perfectly on Linux and
Solaris both with GNU gcc compiler. But it should work with the
GNU compiler on all systems, or wherever there is a glibc
library.
@note Symbol evaluation requires the ELF library and an ELF system.
*/
class StackTrace {
public:
//............................................................... typedefs
typedef std::vector<void*> AddressTrace; ///< container for the adresses
/// structure to store all evaluated information
struct CodePos {
CodePos(void* a, std::string fn, std::string fi, unsigned int l)
throw(std::bad_exception):
address(a), function(fn), file(fi), line(l) {
}
void* address; ///< the address pointer
std::string function; ///< function/method name
std::string file; ///< code file name
unsigned int line; ///< code line number
};
//................................................................ methods
/// the constructor stores the actual stack trace
StackTrace() throw(std::bad_exception);
/// evaluates the symbol table and returns the formatted stack trace
operator std::string() const throw(std::bad_exception);
/// @return list of raw stack addresses
operator const AddressTrace&() const throw(std::bad_exception) {
return _trace;
}
/// evaluate the stack trace and print it to a stream
const StackTrace& print(std::ostream& os) const throw(std::bad_exception);
/// evaluates and returns all information from a raw address
static CodePos translate(void* addr) throw(std::bad_exception);
/** @brief read the symbol table from the executable file
@param std::string The file name of the executable. On Linux
and Solaris, this can be evaluated automatically, so the
parameter is optional.
@return @c true in case of success. If @c false is returned,
the symbol table was not read and the evaluation cannot be
done. Printing then only prints the raw addresses, without
file, line nmber information and method names.
@note This method must be executed once before a stack trace
is printed the very first time. For storing a stack trace
(that means for the creation of a mrw::StackTrace object) a
call to this method is not yet needed.
@note If this method is called more than once, the symbols
are created only the first time, so you don't loose too much
time.
*/
static bool createSymtable(std::string = "") throw(std::bad_exception);
private:
//............................................................... typedefs
typedef std::map<bfd_vma, std::pair<bfd_vma, asection*> >
Translator;
//.............................................................. variables
AddressTrace _trace;
static std::auto_ptr<Translator> _dic;
static std::vector<Translator::key_type> _addrs;
static AutoBfd _bfd;
static std::auto_ptr<asymbol*> _syms;
//................................................................ methods
static std::string filename() throw(std::bad_exception);
static void buildSectionMap(bfd*, asection*, void*)
throw(std::bad_exception);
};
/// evaluate a stack trace and shift it on a stream
inline std::ostream& operator<<(std::ostream& os, const StackTrace& st)
throw(std::bad_exception) {
return os<<(std::string)st;
}
//@}
}
#endif

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#include <mrw/stacktrace.hpp>
#include <cppunit/TestFixture.h>
#include <cppunit/ui/text/TestRunner.h>
#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <iostream>
class StackTraceTest: public CppUnit::TestFixture {
public:
/// test if symbols are correctely evaluated
void StackTrace() {
mrw::StackTrace::createSymtable();
mrw::StackTrace s; int l(__LINE__); std::string f(__FILE__);
std::stringstream ss;
ss<<f<<':'<<l;
std::string st(s);
int pos(st.find(ss.str()));
std::cout<<st<<std::endl;
CPPUNIT_ASSERT(pos<st.size());
CPPUNIT_ASSERT(st.find("mrw::StackTrace::StackTrace()", pos)<st.size());
}
CPPUNIT_TEST_SUITE(StackTraceTest);
CPPUNIT_TEST(StackTrace);
CPPUNIT_TEST_SUITE_END();
};
CPPUNIT_TEST_SUITE_REGISTRATION(StackTraceTest);
int main() {
CppUnit::TextUi::TestRunner runner;
runner.addTest(CppUnit::TestFactoryRegistry::getRegistry().makeTest());
return runner.run() ? 0 : 1;
}

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Hallo Welt

93
mrw/unistd.hpp Normal file
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#ifndef __MRW_UNISTD_HPP__
#define __MRW_UNISTD_HPP__
#include <unistd.h> // pipe, close
#include <errno.h> // errno
namespace mrw {
/** @addtogroup AutoTools */
//@{
/// class that implements an unnamed UNIX pipe
/** Implements a UNIX pipe that is automatically closed in
destructor and offers some facilities. */
class pipe {
private:
/// the filedescriptor, [0] to read and [1] to write
int _fd[2];
int _lastError;
public:
/// creates a unix pipe
pipe(): _lastError(-1) {
_fd[0] = -1;
_fd[1] = -1;
if (::pipe(_fd)==-1)
{
_lastError=errno;
}
}
/// destructor closes pipe if still open
~pipe() {
close();
}
/// closes pipe if open
void close() {
close_in();
close_out();
}
/// closes input pipe if open
void close_in() {
if (_fd[0]!=-1) while (::close(_fd[0])==-1) if (errno!=EINTR) {
_lastError = errno;
break;
}
_fd[0] = -1;
}
/// closes output pipe if open
void close_out() {
if (_fd[1]!=-1) while (::close(_fd[1])==-1) if (errno!=EINTR) {
_lastError = errno;
break;
}
_fd[1] = -1;
}
/// @return true if no error occured
operator bool() {
return _lastError == -1;
}
/// @return last error code, -1 if no error
int error() {
return _lastError;
}
/// connect output stream to @c stdout
void connect_cout() {
while (::dup2(_fd[1], 1)==-1) if (errno!=EINTR) {
_lastError = errno;
return;
}
}
/// connect output stream to @c stderr
void connect_cerr() {
while (::dup2(_fd[1], 2)==-1) if (errno!=EINTR) {
_lastError = errno;
return;
}
}
/// get an input stream
/** @return stream to read from
@note invalid after destruction or @c close or @c close_in */
int istream() {
return _fd[0];
}
/// get an output stream
/** @return stream to write to
@note invalid after destruction or @c close or @c close_out */
int ostream() {
return _fd[1];
}
};
//@}
}
#endif