1  /* Test posix_spawn setsid attribute.
       2     Copyright (C) 2017-2023 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 <spawn.h>
      22  #include <stdbool.h>
      23  #include <stdio.h>
      24  #include <sys/resource.h>
      25  #include <unistd.h>
      26  
      27  #include <support/check.h>
      28  
      29  static void
      30  do_test_setsid (bool test_setsid)
      31  {
      32    pid_t sid, child_sid;
      33    int res;
      34  
      35    /* Current session ID.  */
      36    sid = getsid(0);
      37    if (sid == (pid_t) -1)
      38      FAIL_EXIT1 ("getsid (0): %m");
      39  
      40    posix_spawnattr_t attrp;
      41    /* posix_spawnattr_init should not fail (it basically memset the
      42       attribute).  */
      43    posix_spawnattr_init (&attrp);
      44    if (test_setsid)
      45      {
      46        res = posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID);
      47        if (res != 0)
      48  	{
      49  	  errno = res;
      50  	  FAIL_EXIT1 ("posix_spawnattr_setflags: %m");
      51  	}
      52      }
      53  
      54    /* Program to run.  */
      55    char *args[2] = { (char *) "true", NULL };
      56    pid_t child;
      57  
      58    res = posix_spawnp (&child, "true", NULL, &attrp, args, environ);
      59    /* posix_spawnattr_destroy is noop.  */
      60    posix_spawnattr_destroy (&attrp);
      61  
      62    if (res != 0)
      63      {
      64        errno = res;
      65        FAIL_EXIT1 ("posix_spawnp: %m");
      66      }
      67  
      68    /* Child should have a different session ID than parent.  */
      69    child_sid = getsid (child);
      70  
      71    if (child_sid == (pid_t) -1)
      72      FAIL_EXIT1 ("getsid (%i): %m", child);
      73  
      74    if (test_setsid)
      75      {
      76        if (child_sid == sid)
      77  	FAIL_EXIT1 ("child session ID matched parent one");
      78      }
      79    else
      80      {
      81        if (child_sid != sid)
      82  	FAIL_EXIT1 ("child session ID did not match parent one");
      83      }
      84  }
      85  
      86  static int
      87  do_test (void)
      88  {
      89    do_test_setsid (false);
      90    do_test_setsid (true);
      91  
      92    return 0;
      93  }
      94  
      95  #include <support/test-driver.c>