posix/tst-posix_spawn-fd.c

   1 /* Test that spawn file action functions work without file limit.
   2    Copyright (C) 2016-2024 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 /* _SC_OPEN_MAX value.  */
  28 static long maxfd;
  29
  30 /* A positive but unused file descriptor, used for testing
  31    purposes.  */
  32 static int invalid_fd;
  33
  34 /* Indicate that errors have been encountered.  */
  35 static bool errors;
  36
  37 static posix_spawn_file_actions_t actions;
  38
  39 static void
  40 one_test (const char *name, int (*func) (int), int fd,
  41           bool expect_success)
  42 {
  43   int ret = func (fd);
  44   if (expect_success)
  45     {
  46       if (ret != 0)
  47         {
  48           errno = ret;
  49           printf ("error: posix_spawn_file_actions_%s (%d): %m\n", name, fd);
  50           errors = true;
  51         }
  52     }
  53   else if (ret != EBADF)
  54     {
  55       if (ret == 0)
  56           printf ("error: posix_spawn_file_actions_%s (%d):"
  57                   " unexpected success\n", name, fd);
  58       else
  59         {
  60           errno = ret;
  61           printf ("error: posix_spawn_file_actions_%s (%d): %m\n", name, fd);
  62         }
  63       errors = true;
  64     }
  65 }
  66
  67 static void
  68 all_tests (const char *name, int (*func) (int))
  69 {
  70   one_test (name, func, 0, true);
  71   one_test (name, func, invalid_fd, true);
  72   one_test (name, func, -1, false);
  73   one_test (name, func, -2, false);
  74   if (maxfd >= 0)
  75     one_test (name, func, maxfd, false);
  76 }
  77
  78 static int
  79 addopen (int fd)
  80 {
  81   return posix_spawn_file_actions_addopen
  82     (&actions, fd, "/dev/null", O_RDONLY, 0);
  83 }
  84
  85 static int
  86 adddup2 (int fd)
  87 {
  88   return posix_spawn_file_actions_adddup2 (&actions, fd, 1);
  89 }
  90
  91 static int
  92 adddup2_reverse (int fd)
  93 {
  94   return posix_spawn_file_actions_adddup2 (&actions, 1, fd);
  95 }
  96
  97 static int
  98 addclose (int fd)
  99 {
 100   return posix_spawn_file_actions_addclose (&actions, fd);
 101 }
 102
 103 static void
 104 all_functions (void)
 105 {
 106   all_tests ("addopen", addopen);
 107   all_tests ("adddup2", adddup2);
 108   all_tests ("adddup2", adddup2_reverse);
 109   all_tests ("adddup2", addclose);
 110 }
 111
 112 static int
 113 do_test (void)
 114 {
 115   /* Try to eliminate the file descriptor limit.  */
 116   {
 117     struct rlimit limit;
 118     if (getrlimit (RLIMIT_NOFILE, &limit) < 0)
 119       {
 120         printf ("error: getrlimit: %m\n");
 121         return 1;
 122       }
 123     limit.rlim_cur = RLIM_INFINITY;
 124     if (setrlimit (RLIMIT_NOFILE, &limit) < 0)
 125       printf ("warning: setrlimit: %m\n");
 126   }
 127
 128   maxfd = sysconf (_SC_OPEN_MAX);
 129   printf ("info: _SC_OPEN_MAX: %ld\n", maxfd);
 130
 131   invalid_fd = dup (0);
 132   if (invalid_fd < 0)
 133     {
 134       printf ("error: dup: %m\n");
 135       return 1;
 136     }
 137   if (close (invalid_fd) < 0)
 138     {
 139       printf ("error: close: %m\n");
 140       return 1;
 141     }
 142
 143   int ret = posix_spawn_file_actions_init (&actions);
 144   if (ret != 0)
 145     {
 146       errno = ret;
 147       printf ("error: posix_spawn_file_actions_init: %m\n");
 148       return 1;
 149     }
 150
 151   all_functions ();
 152
 153   ret = posix_spawn_file_actions_destroy (&actions);
 154   if (ret != 0)
 155     {
 156       errno = ret;
 157       printf ("error: posix_spawn_file_actions_destroy: %m\n");
 158       return 1;
 159     }
 160
 161   return errors;
 162 }
 163
 164 #define TEST_FUNCTION do_test ()
 165 #include "../test-skeleton.c"