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no more need for ldd in StackTrace, read from /proc/self/maps

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master
Marc Wäckerlin 20 years ago
parent 6bc3bcc755
commit 8d5c98e8c0
2 changed files with 62 additions and 41 deletions
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  1. 40
      mrw/stacktrace.cpp
  2. 61
      mrw/stacktrace.hpp

40
mrw/stacktrace.cpp
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@ -9,6 +9,9 @@
@license LGPL, see file <a href="license.html">COPYING</a>
$Log$
Revision 1.7 2004/10/13 10:47:15 marc
no more need for ldd in StackTrace, read from /proc/self/maps
Revision 1.6 2004/10/11 15:58:51 marc
First version with working support for shared libraries!
@ -45,6 +48,7 @@
#include <fcntl.h>
#include <assert.h>
#include <math.h>
#include <fstream>
#include <algorithm>
#include <list>
#if defined(__solaris__)
@ -237,10 +241,10 @@ bool mrw::StackTrace::createSymtable(const mrw::StackTrace::BinFiles& files)
mrw::StackTrace::BinFiles mrw::StackTrace::filename()
throw(std::bad_exception) {
mrw::StackTrace::BinFiles res;
std::string s;
s<<"/proc/"<<getpid();
# if defined(__solaris__)
{
std::string s;
s<<"/proc/"<<getpid();
AutoFile fd(open(s.str(), O_RDONLY));
prpsinfo_t status;
if (fd==-1 || ioctl(fd, PIOCPSINFO, &status)==-1) return res;
@ -249,26 +253,18 @@ mrw::StackTrace::BinFiles mrw::StackTrace::filename()
}
# elif defined(__linux__)
{
res<<BinFiles::value_type(s<<"/exe", 0);
try {
mrw::Exec ldd = (mrw::Cmd("/usr/bin/ldd"), s).execute();
for (std::string lddres(ldd.result());
lddres.size();
lddres.erase(0, min(lddres.find('\n')+1, std::string::npos))) {
std::string line(lddres.substr(0, lddres.find('\n')));
std::string::size_type pos = line.find(" => ");
if (pos<std::string::npos) {
pos += 4;
std::string file = line.substr(pos, (pos=line.find(' ', pos)-pos));
std::stringstream addr;
addr<<line.substr(++(pos=line.find('(', pos)),
line.find(')', pos)-pos);
void* address(0);
addr>>address;
if (file.size()) res<<BinFiles::value_type(file, address);
}
res<<BinFiles::value_type("/proc/self/exe", 0);
std::ifstream is("/proc/self/maps");
std::string s;
std::string range, perm, x1, x2, size, lib;
while (getline(is, s)) {
range = perm = x1 = x2 = size = lib = "????";
s>>range>>perm>>x1>>x2>>size>>lib;
range.resize(range.find_first_not_of("0123456789abcdefABCDEF"));
void* addr(0);
range>>addr;
if (lib.size() && addr>0) res<<BinFiles::value_type(lib, addr);
}
} catch (mrw::ExecutionFailedExc&) {}
return res;
}
# else
@ -276,7 +272,7 @@ mrw::StackTrace::BinFiles mrw::StackTrace::filename()
# 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!"
abort();
return res; // empty
}
# endif
}

61
mrw/stacktrace.hpp
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@ -9,6 +9,9 @@
@license LGPL, see file <a href="license.html">COPYING</a>
$Log$
Revision 1.9 2004/10/13 10:47:15 marc
no more need for ldd in StackTrace, read from /proc/self/maps
Revision 1.8 2004/10/11 16:49:32 marc
Better comment for new shared library feature
@ -90,7 +93,6 @@ namespace mrw {
- 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
*/
//@{
@ -108,10 +110,8 @@ namespace mrw {
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 Debug information is required for compiling. You nee the
compile option @c -g, or even better @c -ggdb3.
@note The stack trace is known to work perfectly on Linux and
Solaris both with GNU gcc compiler. But it should work with the
@ -145,17 +145,43 @@ namespace mrw {
Unfortunately it is not possible to extract the source file name
and line number information if the executable was not compiled
with debug option @c -g. But what's worse, it is not possible to
ger symbolic information from libraries linked to the
executable. Perhaps it could be possible, if I'd add a
possibility to read and evaluate these libraries, but that's for
a future release. (Now, 10/08/2004, I am working on it)
@todo Add support to read debugging information from libraries
that are linked to the executable. (soon)
with debug option @c -g.
@todo Add support for alternative symbol evaluation using @c
backtrace_symbols.
@bug File and line is wrong where the exception is thrown. On
Address [0x4007830b] file and line is wrong, the file should be
/privat/home/marc/pro/mrw-c++/mrw/exception.cpp. File and line
are always wrong at the line where the exception is
instanciated. Why?!? (Could it be, because there is a string
created inline? The trace always shows basic_string.h.)
@code
UNEXPECTED EXCEPTION: ----------------------------
---------- Reason:
mrw::Exec: command execution failed
failed command was: "/bin/false"
error was: "execution failed"
---------- Stack:
1[0x8049b71] ../sysdeps/i386/elf/start.S:105 _start
[0x4022f92b] ????:0 __libc_start_main
[0x8049c96] /usr/include/g++/bits/basic_string.h:249 main
[0x40054668] ????:0 CppUnit::TextUi::TestRunner::run(std::string, bool, bool, bool)
[0x40054747] ????:0 CppUnit::TextUi::TestRunner::runTestByName(std::string, bool)
[0x400543ec] ????:0 CppUnit::TextUi::TestRunner::runTest(CppUnit::Test*, bool)
[0x4005525b] ????:0 CppUnit::TestSuite::run(CppUnit::TestResult*)
[0x4005525b] ????:0 CppUnit::TestSuite::run(CppUnit::TestResult*)
[0x4005525b] ????:0 CppUnit::TestSuite::run(CppUnit::TestResult*)
[0x4004aa06] ????:0 CppUnit::TestCase::run(CppUnit::TestResult*)
[0x804b164] /usr/include/cppunit/TestCaller.h:166 CppUnit::TestCaller<ExecTest, std::bad_exception>::runTest()
[0x804b299] /usr/include/g++/bits/stl_alloc.h:652 ExecTest::unexpectedExc()
[0x40078bda] /privat/home/marc/pro/mrw-c++/mrw/exec.cpp:77 mrw::Cmd::execute(bool) const
[0x4007830b] /usr/include/g++/bits/basic_string.h:249 mrw::Exec::execute(bool)
[0x40077941] /privat/home/marc/pro/mrw-c++/mrw/exec.cpp:38 mrw::ExecutionFailedExc::ExecutionFailedExc(std::string const&, std::string const&)
[0x400769d4] /privat/home/marc/pro/mrw-c++/mrw/exception.cpp:41 mrw::exception::exception()
[0x4007cbc5] /privat/home/marc/pro/mrw-c++/mrw/stacktrace.cpp:118 mrw::StackTrace::StackTrace()
-------------------------------------------------
@endcode
*/
class StackTrace {
public:
@ -193,11 +219,10 @@ namespace mrw {
/** @brief read the symbol table from the executable file or a
shared library
On Solaris and Linux, the name of the executable is
automatically detected through the @c /dev/proc file
system. Only on Linux the shared libraries are detected
through a call to @c ldd. So you may leave the parameter
empty on these systems.
On Solaris and Linux, the executable is automatically
detected through the @c /proc file system. Only on Linux the
shared libraries are detected through @c /proc/self/maps. So
you may leave the parameter empty on these systems.
@param fname The file name of the executable or a shared
library. On Linux and Solaris, this can be evaluated

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