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/* Test of posix_spawn() function with 'open' action and O_APPEND flag.
Copyright (C) 2008-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
/* Test whether posix_spawn_file_actions_addopen supports the O_APPEND flag. */
#include <config.h>
#include <spawn.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#define CHILD_PROGRAM_FILENAME "test-posix_spawn-open2" EXEEXT
#define DATA_FILENAME "test-posix_spawn-open2-data.tmp"
static int
parent_main (void)
{
FILE *fp;
char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL };
posix_spawn_file_actions_t actions;
bool actions_allocated;
int err;
pid_t child;
int status;
int exitstatus;
/* Create a data file with specific contents. */
fp = fopen (DATA_FILENAME, "wb");
if (fp == NULL)
{
perror ("cannot create data file");
return 1;
}
fwrite ("Halle ", 1, 6, fp);
if (fflush (fp) || fclose (fp))
{
perror ("cannot prepare data file");
return 1;
}
/* Test whether posix_spawn_file_actions_addopen with O_APPEND flag causes
the child to append to this file. */
actions_allocated = false;
if ((err = posix_spawn_file_actions_init (&actions)) != 0
|| (actions_allocated = true,
(err = posix_spawn_file_actions_addopen (&actions, STDOUT_FILENO, DATA_FILENAME, O_RDWR | O_APPEND, 0600)) != 0
|| (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
{
if (actions_allocated)
posix_spawn_file_actions_destroy (&actions);
errno = err;
perror ("subprocess failed");
return 1;
}
posix_spawn_file_actions_destroy (&actions);
status = 0;
while (waitpid (child, &status, 0) != child)
;
if (!WIFEXITED (status))
{
fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
return 1;
}
exitstatus = WEXITSTATUS (status);
if (exitstatus != 0)
{
fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
return 1;
}
/* Check the contents of the data file. */
fp = fopen (DATA_FILENAME, "rb");
if (fp == NULL)
{
perror ("cannot open data file");
return 1;
}
char buf[1024];
int nread = fread (buf, 1, sizeof (buf), fp);
if (!(nread == 11 && memcmp (buf, "Halle Potta", 11) == 0))
{
fprintf (stderr, "data file wrong: has %d bytes, expected %d bytes\n", nread, 11);
return 1;
}
if (fclose (fp))
{
perror ("cannot close data file");
return 1;
}
/* Clean up data file. */
unlink (DATA_FILENAME);
return 0;
}
static int
child_main (void)
{
/* Write to STDOUT_FILENO. */
fwrite ("Potta", 1, 5, stdout);
/* No 'fflush (stdout);' is needed. It is implicit when the child process
exits. */
return 0;
}
static void
cleanup_then_die (int sig)
{
/* Clean up data file. */
unlink (DATA_FILENAME);
/* Re-raise the signal and die from it. */
signal (sig, SIG_DFL);
raise (sig);
}
int
main (int argc, char *argv[])
{
int exitstatus;
if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
{
/* This is the parent process. */
signal (SIGINT, cleanup_then_die);
signal (SIGTERM, cleanup_then_die);
#ifdef SIGHUP
signal (SIGHUP, cleanup_then_die);
#endif
exitstatus = parent_main ();
}
else
{
/* This is the child process. */
exitstatus = child_main ();
}
return exitstatus;
}
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