root/maint/gnulib/tests/test-posix_spawn-open1.c

/* */

DEFINITIONS

1. parent_main
2. child_main
3. cleanup_then_die
4. main

   1 /* Test of posix_spawn() function with 'open' action.
   2    Copyright (C) 2008-2021 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 /* Test whether posix_spawn_file_actions_addopen supports filename arguments
  20    that contain special characters such as '*'.  */
  21 
  22 #include <config.h>
  23 
  24 #include <spawn.h>
  25 
  26 #include "signature.h"
  27 SIGNATURE_CHECK (posix_spawn, int, (pid_t *, char const *,
  28                                     posix_spawn_file_actions_t const *,
  29                                     posix_spawnattr_t const *,
  30                                     char *const[], char *const[]));
  31 #include <errno.h>
  32 #include <fcntl.h>
  33 #include <signal.h>
  34 #include <stdbool.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <sys/types.h>
  39 #include <sys/wait.h>
  40 
  41 #define CHILD_PROGRAM_FILENAME "test-posix_spawn-open1"
  42 #define DATA_FILENAME "t!#$%&'()*+,-;=?@[\\]^_`{|}~.tmp"
  43 /* On Windows (including Cygwin), '*' '?' '\\' '|' cannot be used in file
  44    names.  */
  45 #if defined _WIN32 || defined __CYGWIN__
  46 # undef DATA_FILENAME
  47 # define DATA_FILENAME "t!#$%&'()+,-;=@[]^_`{}~.tmp"
  48 #endif
  49 
  50 static int
  51 parent_main (void)
     /*  */
  52 {
  53   FILE *fp;
  54   char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL };
  55   posix_spawn_file_actions_t actions;
  56   bool actions_allocated;
  57   int err;
  58   pid_t child;
  59   int status;
  60   int exitstatus;
  61 
  62   /* Create a data file with specific contents.  */
  63   fp = fopen (DATA_FILENAME, "wb");
  64   if (fp == NULL)
  65     {
  66       perror ("cannot create data file");
  67       return 1;
  68     }
  69   fwrite ("Halle Potta", 1, 11, fp);
  70   if (fflush (fp) || fclose (fp))
  71     {
  72       perror ("cannot prepare data file");
  73       return 1;
  74     }
  75 
  76   /* Avoid reading from our stdin, as it could block.  */
  77   if (freopen ("/dev/null", "rb", stdin) == NULL)
  78     {
  79       perror ("cannot redirect stdin");
  80       return 1;
  81     }
  82 
  83   /* Test whether posix_spawn_file_actions_addopen with this file name
  84      actually works, by spawning a child that reads from this file.  */
  85   actions_allocated = false;
  86   if ((err = posix_spawn_file_actions_init (&actions)) != 0
  87       || (actions_allocated = true,
  88           (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0
  89           || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
  90     {
  91       if (actions_allocated)
  92         posix_spawn_file_actions_destroy (&actions);
  93       errno = err;
  94       perror ("subprocess failed");
  95       return 1;
  96     }
  97   posix_spawn_file_actions_destroy (&actions);
  98   status = 0;
  99   while (waitpid (child, &status, 0) != child)
 100     ;
 101   if (!WIFEXITED (status))
 102     {
 103       fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
 104       return 1;
 105     }
 106   exitstatus = WEXITSTATUS (status);
 107   if (exitstatus != 0)
 108     {
 109       fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
 110       return 1;
 111     }
 112   return 0;
 113 }
 114 
 115 static int
 116 child_main (void)
     /*  */
 117 {
 118   char buf[1024];
 119 
 120   /* See if reading from STDIN_FILENO yields the expected contents.  */
 121   if (fread (buf, 1, sizeof (buf), stdin) == 11
 122       && memcmp (buf, "Halle Potta", 11) == 0)
 123     return 0;
 124   else
 125     return 2;
 126 }
 127 
 128 static void
 129 cleanup_then_die (int sig)
     /*  */
 130 {
 131   /* Clean up data file.  */
 132   unlink (DATA_FILENAME);
 133 
 134   /* Re-raise the signal and die from it.  */
 135   signal (sig, SIG_DFL);
 136   raise (sig);
 137 }
 138 
 139 int
 140 main (int argc, char *argv[])
     /*  */
 141 {
 142   int exitstatus;
 143 
 144   if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
 145     {
 146       /* This is the parent process.  */
 147       signal (SIGINT, cleanup_then_die);
 148       signal (SIGTERM, cleanup_then_die);
 149       #ifdef SIGHUP
 150       signal (SIGHUP, cleanup_then_die);
 151       #endif
 152 
 153       exitstatus = parent_main ();
 154     }
 155   else
 156     {
 157       /* This is the child process.  */
 158 
 159       exitstatus = child_main ();
 160     }
 161   unlink (DATA_FILENAME);
 162   return exitstatus;
 163 }

/* */