tests/dwfl-bug-fd-leak.c

/* Test program for libdwfl file descriptors leakage.
   Copyright (C) 2007, 2008 Red Hat, Inc.
   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   elfutils is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <locale.h>
#include <dirent.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <dwarf.h>
#include "system.h"

#ifndef __linux__
int
main (void)
{
  return 77; /* dwfl_linux_proc_report is linux specific.  */
}
#else

#include <sys/resource.h>
#include ELFUTILS_HEADER(dwfl)


static Dwfl *
elfutils_open (pid_t pid, Dwarf_Addr address)
{
  static char *debuginfo_path;
  static const Dwfl_Callbacks proc_callbacks =
    {
      .find_debuginfo = dwfl_standard_find_debuginfo,
      .debuginfo_path = &debuginfo_path,

      .find_elf = dwfl_linux_proc_find_elf,
    };
  Dwfl *dwfl = dwfl_begin (&proc_callbacks);
  if (dwfl == NULL)
    error (2, 0, "dwfl_begin: %s", dwfl_errmsg (-1));

  int result = dwfl_linux_proc_report (dwfl, pid);
  if (result < 0)
    error (2, 0, "dwfl_linux_proc_report: %s", dwfl_errmsg (-1));
  else if (result > 0)
    error (2, result, "dwfl_linux_proc_report");

  if (dwfl_report_end (dwfl, NULL, NULL) != 0)
    error (2, 0, "dwfl_report_end: %s", dwfl_errmsg (-1));

  Dwarf_Addr bias;
  Dwarf *dbg = dwfl_addrdwarf (dwfl, address, &bias);
  if (dbg != NULL)
    {
      Elf *elf = dwarf_getelf (dbg);
      if (elf == NULL)
	error (2, 0, "dwarf_getelf: %s", dwarf_errmsg (-1));
    }
  else
    {
      Dwfl_Module *module = dwfl_addrmodule (dwfl, address);
      if (module == NULL)
	error (2, 0, "dwfl_addrmodule: no module available for 0x%" PRIx64 "",
	       address);
      Elf *elf = dwfl_module_getelf (module, &bias);
      if (elf == NULL)
	error (2, 0, "dwfl_module_getelf: %s", dwfl_errmsg (-1));
    }

  return dwfl;
}

static void
elfutils_close (Dwfl *dwfl)
{
  dwfl_end (dwfl);
}

int
main (void)
{
  /* We use no threads here which can interfere with handling a stream.  */
  (void) __fsetlocking (stdout, FSETLOCKING_BYCALLER);

  /* Set locale.  */
  (void) setlocale (LC_ALL, "");

  /* Get both the soft and hard limits first. The soft limit is what
     will be enforced against the process.  The hard limit is the max
     that can be set for the soft limit.  We don't want to lower it
     because we might not be able to (under valgrind).  */
  struct rlimit fd_limit;
  if (getrlimit (RLIMIT_NOFILE, &fd_limit) < 0)
    error (2, errno, "getrlimit");
  fd_limit.rlim_cur = 32;
  if (setrlimit (RLIMIT_NOFILE, &fd_limit) < 0)
    error (2, errno, "setrlimit");

  for (int i = 0; i < 5000; ++i)
    {
      Dwfl *dwfl = elfutils_open (getpid (), (Dwarf_Addr) (uintptr_t) &main);
      elfutils_close (dwfl);
    }

  return 0;
}
#endif