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

mrw/stacktrace.cpp

@@ -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);
+    res<<BinFiles::value_type("/proc/self/exe", 0);
-    try {
+    std::ifstream is("/proc/self/maps");
-      mrw::Exec ldd = (mrw::Cmd("/usr/bin/ldd"), s).execute();
+    std::string s;
-      for (std::string lddres(ldd.result());
+    std::string range, perm, x1, x2, size, lib;
-           lddres.size();
+    while (getline(is, s)) {
-           lddres.erase(0, min(lddres.find('\n')+1, std::string::npos))) {
+      range = perm = x1 = x2 = size = lib = "????";
-        std::string line(lddres.substr(0, lddres.find('\n')));
+      s>>range>>perm>>x1>>x2>>size>>lib;
-        std::string::size_type pos = line.find(" => ");
+      range.resize(range.find_first_not_of("0123456789abcdefABCDEF"));
-        if (pos<std::string::npos) {
+      void* addr(0);
-          pos += 4;
+      range>>addr;
-          std::string file = line.substr(pos, (pos=line.find(' ', pos)-pos));
+      if (lib.size() && addr>0) res<<BinFiles::value_type(lib, addr);
-          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);
     }
-      }
-    } 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 
 }

mrw/stacktrace.hpp

@@ -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
+      @note Debug information is required for compiling. You nee the
-      is required for compiling. You nee the compile option @c -g, or
+      compile option @c -g, or even better @c -ggdb3.
-      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
@@ -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
+      with debug option @c -g.
-      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)
 
       @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
+          On Solaris and Linux, the executable is automatically
-          automatically detected through the @c /dev/proc file
+          detected through the @c /proc file system. Only on Linux the
-          system. Only on Linux the shared libraries are detected
+          shared libraries are detected through @c /proc/self/maps. So
-          through a call to @c ldd. So you may leave the parameter
+          you may leave the parameter empty on these systems.
-          empty on these systems.
 
           @param fname The file name of the executable or a shared
           library. On Linux and Solaris, this can be evaluated