glibc/posix/tst-spawn.c

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/* Tests for spawn.
Copyright (C) 2000-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wait.h>
#include <sys/param.h>
/* Nonzero if the program gets called via `exec'. */
static int restart;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
/* Prototype for our test function. */
extern void do_prepare (int argc, char *argv[]);
extern int do_test (int argc, char *argv[]);
/* We have a preparation function. */
#define PREPARE do_prepare
#include "../test-skeleton.c"
/* Name of the temporary files. */
static char *name1;
static char *name2;
static char *name3;
/* Descriptors for the temporary files. */
static int temp_fd1 = -1;
static int temp_fd2 = -1;
static int temp_fd3 = -1;
/* The contents of our files. */
static const char fd1string[] = "This file should get closed";
static const char fd2string[] = "This file should stay opened";
static const char fd3string[] = "This file will be opened";
/* We have a preparation function. */
void
do_prepare (int argc, char *argv[])
{
/* We must not open any files in the restart case. */
if (restart)
return;
temp_fd1 = create_temp_file ("spawn", &name1);
temp_fd2 = create_temp_file ("spawn", &name2);
temp_fd3 = create_temp_file ("spawn", &name3);
if (temp_fd1 < 0 || temp_fd2 < 0 || temp_fd3 < 0)
exit (1);
}
static int
handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
const char *fd4s, const char *name)
{
char buf[100];
int fd1;
int fd2;
int fd3;
int fd4;
/* First get the descriptors. */
fd1 = atol (fd1s);
fd2 = atol (fd2s);
fd3 = atol (fd3s);
fd4 = atol (fd4s);
/* Sanity check. */
if (fd1 == fd2)
error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");
if (fd1 == fd3)
error (EXIT_FAILURE, 0, "value of fd1 and fd3 is the same");
if (fd1 == fd4)
error (EXIT_FAILURE, 0, "value of fd1 and fd4 is the same");
if (fd2 == fd3)
error (EXIT_FAILURE, 0, "value of fd2 and fd3 is the same");
if (fd2 == fd4)
error (EXIT_FAILURE, 0, "value of fd2 and fd4 is the same");
if (fd3 == fd4)
error (EXIT_FAILURE, 0, "value of fd3 and fd4 is the same");
/* First the easy part: read from the file descriptor which is
supposed to be open. */
if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
error (EXIT_FAILURE, errno, "file 2 not in right position");
/* The duped descriptor must have the same position. */
if (lseek (fd4, 0, SEEK_CUR) != strlen (fd2string))
error (EXIT_FAILURE, errno, "file 4 not in right position");
if (lseek (fd2, 0, SEEK_SET) != 0)
error (EXIT_FAILURE, 0, "cannot reset position in file 2");
if (lseek (fd4, 0, SEEK_CUR) != 0)
error (EXIT_FAILURE, errno, "file 4 not set back, too");
if (read (fd2, buf, sizeof buf) != strlen (fd2string))
error (EXIT_FAILURE, 0, "cannot read file 2");
if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
error (EXIT_FAILURE, 0, "file 2 does not match");
/* Now read from the third file. */
if (read (fd3, buf, sizeof buf) != strlen (fd3string))
error (EXIT_FAILURE, 0, "cannot read file 3");
if (memcmp (fd3string, buf, strlen (fd3string)) != 0)
error (EXIT_FAILURE, 0, "file 3 does not match");
/* Try to write to the file. This should not be allowed. */
if (write (fd3, "boo!", 4) != -1 || errno != EBADF)
error (EXIT_FAILURE, 0, "file 3 is writable");
/* Now try to read the first file. First make sure it is not opened. */
if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);
/* Now open the file and read it. */
fd1 = open (name, O_RDONLY);
if (fd1 == -1)
error (EXIT_FAILURE, errno,
"cannot open first file \"%s\" for verification", name);
if (read (fd1, buf, sizeof buf) != strlen (fd1string))
error (EXIT_FAILURE, errno, "cannot read file 1");
if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
error (EXIT_FAILURE, 0, "file 1 does not match");
return 0;
}
int
do_test (int argc, char *argv[])
{
pid_t pid;
int fd4;
int status;
posix_spawn_file_actions_t actions;
char fd1name[18];
char fd2name[18];
char fd3name[18];
char fd4name[18];
char *name3_copy;
char *spargv[12];
int i;
/* We must have
- one or four parameters left if called initially
+ path for ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name
- five parameters left if called through re-execution
+ file descriptor number which is supposed to be closed
+ the open file descriptor
+ the newly opened file descriptor
+ thhe duped second descriptor
+ the name of the closed descriptor
*/
if (argc != (restart ? 6 : 2) && argc != (restart ? 6 : 5))
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
if (restart)
return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5]);
/* Prepare the test. We are creating two files: one which file descriptor
will be marked with FD_CLOEXEC, another which is not. */
/* Write something in the files. */
if (write (temp_fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
error (EXIT_FAILURE, errno, "cannot write to first file");
if (write (temp_fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
error (EXIT_FAILURE, errno, "cannot write to second file");
if (write (temp_fd3, fd3string, strlen (fd3string)) != strlen (fd3string))
error (EXIT_FAILURE, errno, "cannot write to third file");
/* Close the third file. It'll be opened by `spawn'. */
close (temp_fd3);
/* Tell `spawn' what to do. */
if (posix_spawn_file_actions_init (&actions) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_init");
/* Close `temp_fd1'. */
if (posix_spawn_file_actions_addclose (&actions, temp_fd1) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addclose");
/* We want to open the third file. */
name3_copy = strdup (name3);
if (name3_copy == NULL)
error (EXIT_FAILURE, errno, "strdup");
if (posix_spawn_file_actions_addopen (&actions, temp_fd3, name3_copy,
O_RDONLY, 0666) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addopen");
/* Overwrite the name to check that a copy has been made. */
memset (name3_copy, 'X', strlen (name3_copy));
/* We dup the second descriptor. */
fd4 = MAX (2, MAX (temp_fd1, MAX (temp_fd2, temp_fd3))) + 1;
if (posix_spawn_file_actions_adddup2 (&actions, temp_fd2, fd4) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_adddup2");
/* Now spawn the process. */
snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
snprintf (fd3name, sizeof fd3name, "%d", temp_fd3);
snprintf (fd4name, sizeof fd4name, "%d", fd4);
for (i = 0; i < (argc == (restart ? 6 : 5) ? 4 : 1); i++)
spargv[i] = argv[i + 1];
spargv[i++] = (char *) "--direct";
spargv[i++] = (char *) "--restart";
spargv[i++] = fd1name;
spargv[i++] = fd2name;
spargv[i++] = fd3name;
spargv[i++] = fd4name;
spargv[i++] = name1;
spargv[i] = NULL;
if (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ) != 0)
error (EXIT_FAILURE, errno, "posix_spawn");
/* Same test but with a NULL pid argument. */
if (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ) != 0)
error (EXIT_FAILURE, errno, "posix_spawn");
/* Cleanup. */
if (posix_spawn_file_actions_destroy (&actions) != 0)
error (EXIT_FAILURE, errno, "posix_spawn_file_actions_destroy");
free (name3_copy);
/* Wait for the child. */
if (waitpid (pid, &status, 0) != pid)
error (EXIT_FAILURE, errno, "wrong child");
if (WTERMSIG (status) != 0)
error (EXIT_FAILURE, 0, "Child terminated incorrectly");
status = WEXITSTATUS (status);
return status;
}