const i8 * csdbg::util::exec_path ( )

static

Get the absolute path of the executable.

Returns

the path (heap allocated)

Exceptions

std::bad_alloc
csdbg::exception

Definition at line 87 of file util.cpp.

References unlikely.

Referenced by csdbg::streambuf::header(), csdbg::tracer::on_lib_load(), and csdbg::filebuf::unique_id().

{
  /*
   * The procfs filesystem maintains a directory for each process (/proc/pid)
   * and a symlink therein (exe) that contains the absolute path of the process
   * executable
   */
  i8 path[PATH_MAX + 1];
  i32 len = snprintf(path, PATH_MAX + 1, "/proc/%d/exe", getpid());
  if ( unlikely(len < 0) )
    throw exception("snprintf failed with retval %d", len);

  i8 *retval = new i8[PATH_MAX + 1];

  /* Read the contents of the symlink */
  len = readlink(path, retval, PATH_MAX);
  if ( unlikely(len < 0) ) {
    delete[] retval;
    throw exception(
      "failed to read symlink '%s' (errno %d - %s)",
      path,
      errno,
      strerror(errno)
    );
  }

  retval[len] = '\0';
  return retval;
}

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