rt/tst-mqueue7.c

   1 /* Test all open message queues descriptors are closed during exec*.
   2    Copyright (C) 2004-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <mqueue.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/wait.h>
  26 #include <time.h>
  27 #include <unistd.h>
  28
  29 #define OPT_AFTEREXEC 20000
  30
  31 static mqd_t after_exec = (mqd_t) -1;
  32
  33 #define CMDLINE_OPTIONS \
  34   { "after-exec", required_argument, NULL, OPT_AFTEREXEC },
  35
  36 #define CMDLINE_PROCESS \
  37   case OPT_AFTEREXEC:                                   \
  38     after_exec = (mqd_t) strtoul (optarg, NULL, 0);     \
  39     break;
  40
  41 static int
  42 do_after_exec (void)
  43 {
  44   int result = 0;
  45
  46   struct mq_attr attr;
  47   if (mq_getattr (after_exec, &attr) == 0)
  48     {
  49       puts ("mq_getattr after exec unexpectedly succeeded");
  50       result = 1;
  51     }
  52   else if (errno != EBADF)
  53     {
  54       printf ("mq_getattr after exec did not fail with EBADF: %m\n");
  55       result = 1;
  56     }
  57
  58   return result;
  59 }
  60
  61 static int
  62 do_test (int argc, char **argv)
  63 {
  64   if (after_exec != (mqd_t) -1)
  65     return do_after_exec ();
  66
  67   char name[sizeof "/tst-mqueue7-" + sizeof (pid_t) * 3];
  68   snprintf (name, sizeof (name), "/tst-mqueue7-%u", getpid ());
  69
  70   struct mq_attr attr = { .mq_maxmsg = 10, .mq_msgsize = 1 };
  71   mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_WRONLY, 0600, &attr);
  72
  73   if (q == (mqd_t) -1)
  74     {
  75       printf ("mq_open failed with: %m\n");
  76       return 0;
  77     }
  78   else if (mq_unlink (name) != 0)
  79     {
  80       printf ("mq_unlink failed with: %m\n");
  81       return 1;
  82     }
  83
  84   if (mq_getattr (q, &attr) != 0)
  85     {
  86       printf ("mq_getattr failed: %m\n");
  87       return 1;
  88     }
  89
  90   char after_exec_arg[sizeof "--after-exec=0x" + sizeof (long) * 3];
  91   snprintf (after_exec_arg, sizeof (after_exec_arg),
  92             "--after-exec=0x%lx", (long) q);
  93
  94   const char *newargv[argc + 2];
  95   for (int i = 1; i < argc; ++i)
  96     newargv[i - 1] = argv[i];
  97   newargv[argc - 1] = "--direct";
  98   newargv[argc] = after_exec_arg;
  99   newargv[argc + 1] = NULL;
 100
 101   /* Verify that exec* has the effect of mq_close (q).  */
 102   execv (newargv[0], (char * const *) newargv);
 103   printf ("execv failed: %m\n");
 104   return 1;
 105 }
 106
 107 #include "../test-skeleton.c"