tests/test-posix_spawn-dup2-stdout.c

   1 /* Test of posix_spawn() function: reading from a subprocess.
   2    Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
  18
  19 #include <config.h>
  20
  21 #include <spawn.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (posix_spawnp, int, (pid_t *, char const *,
  25                                      posix_spawn_file_actions_t const *,
  26                                      posix_spawnattr_t const *,
  27                                      char *const[], char *const[]));
  28 SIGNATURE_CHECK (posix_spawnattr_init, int, (posix_spawnattr_t *));
  29 SIGNATURE_CHECK (posix_spawnattr_destroy, int, (posix_spawnattr_t *));
  30 SIGNATURE_CHECK (posix_spawnattr_setsigmask, int, (posix_spawnattr_t *,
  31                                                    sigset_t const *));
  32 SIGNATURE_CHECK (posix_spawnattr_setflags, int, (posix_spawnattr_t *, short));
  33 SIGNATURE_CHECK (posix_spawn_file_actions_init, int,
  34                  (posix_spawn_file_actions_t *));
  35 SIGNATURE_CHECK (posix_spawn_file_actions_destroy, int,
  36                  (posix_spawn_file_actions_t *));
  37 SIGNATURE_CHECK (posix_spawn_file_actions_addclose, int,
  38                  (posix_spawn_file_actions_t *, int));
  39 SIGNATURE_CHECK (posix_spawn_file_actions_addopen, int,
  40                  (posix_spawn_file_actions_t *, int, char const *, int,
  41                   mode_t));
  42 SIGNATURE_CHECK (posix_spawn_file_actions_adddup2, int,
  43                  (posix_spawn_file_actions_t *, int, int));
  44
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <signal.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <sys/types.h>
  53 #include <sys/wait.h>
  54
  55 #define CHILD_PROGRAM_FILENAME "test-posix_spawn-dup2-stdout.sh"
  56
  57 static int
  58 fd_safer (int fd)
  59 {
  60   if (0 <= fd && fd <= 2)
  61     {
  62       int f = fd_safer (dup (fd));
  63       int e = errno;
  64       close (fd);
  65       errno = e;
  66       fd = f;
  67     }
  68
  69   return fd;
  70 }
  71
  72 int
  73 main ()
  74 {
  75   char *argv[3] = { (char *) BOURNE_SHELL, (char *) CHILD_PROGRAM_FILENAME, NULL };
  76   int ifd[2];
  77   sigset_t blocked_signals;
  78   sigset_t fatal_signal_set;
  79   posix_spawn_file_actions_t actions;
  80   bool actions_allocated;
  81   posix_spawnattr_t attrs;
  82   bool attrs_allocated;
  83   int err;
  84   pid_t child;
  85   int fd;
  86   FILE *fp;
  87   char line[80];
  88   int status;
  89   int exitstatus;
  90
  91   if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
  92     {
  93       perror ("cannot create pipe");
  94       exit (1);
  95     }
  96   sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
  97   sigemptyset (&fatal_signal_set);
  98   sigaddset (&fatal_signal_set, SIGINT);
  99   sigaddset (&fatal_signal_set, SIGTERM);
 100   #ifdef SIGHUP
 101   sigaddset (&fatal_signal_set, SIGHUP);
 102   #endif
 103   #ifdef SIGPIPE
 104   sigaddset (&fatal_signal_set, SIGPIPE);
 105   #endif
 106   sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
 107   actions_allocated = false;
 108   attrs_allocated = false;
 109   if ((err = posix_spawn_file_actions_init (&actions)) != 0
 110       || (actions_allocated = true,
 111           (err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
 112           || (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
 113           || (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
 114           || (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
 115           || (err = posix_spawnattr_init (&attrs)) != 0
 116           || (attrs_allocated = true,
 117               #if defined _WIN32 && !defined __CYGWIN__
 118               0
 119               #else
 120               (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
 121               || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
 122               #endif
 123              )
 124           || (err = posix_spawnp (&child, BOURNE_SHELL, &actions, &attrs, argv, environ)) != 0))
 125     {
 126       if (actions_allocated)
 127         posix_spawn_file_actions_destroy (&actions);
 128       if (attrs_allocated)
 129         posix_spawnattr_destroy (&attrs);
 130       sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
 131       errno = err;
 132       perror ("subprocess failed");
 133       exit (1);
 134     }
 135   posix_spawn_file_actions_destroy (&actions);
 136   posix_spawnattr_destroy (&attrs);
 137   sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
 138   close (ifd[1]);
 139   fd = ifd[0];
 140   fp = fdopen (fd, "r");
 141   if (fp == NULL)
 142     {
 143       fprintf (stderr, "fdopen() failed\n");
 144       exit (1);
 145     }
 146   if (fread (line, 1, 80, fp) < 12)
 147     {
 148       fprintf (stderr, "could not read expected output\n");
 149       exit (1);
 150     }
 151   if (memcmp (line, "Halle Potta", 11) != 0)
 152     {
 153       fprintf (stderr, "read output is not the expected output\n");
 154       exit (1);
 155     }
 156   fclose (fp);
 157   status = 0;
 158   while (waitpid (child, &status, 0) != child)
 159     ;
 160   if (!WIFEXITED (status))
 161     {
 162       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 163       exit (1);
 164     }
 165   exitstatus = WEXITSTATUS (status);
 166   if (exitstatus != 0)
 167     {
 168       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 169       exit (1);
 170     }
 171   return 0;
 172 }