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/* Tests for exec.
Copyright (C) 2000-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wait.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;
/* File descriptors for these temporary files. */
static int temp_fd1 = -1;
static int temp_fd2 = -1;
/* The contents of our files. */
static const char fd1string[] = "This file should get closed";
static const char fd2string[] = "This file should stay 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 ("exec", &name1);
temp_fd2 = create_temp_file ("exec", &name2);
if (temp_fd1 < 0 || temp_fd2 < 0)
exit (1);
}
static int
handle_restart (const char *fd1s, const char *fd2s, const char *name)
{
char buf[100];
int fd1;
int fd2;
/* First get the descriptors. */
fd1 = atol (fd1s);
fd2 = atol (fd2s);
/* Sanity check. */
if (fd1 == fd2)
error (EXIT_FAILURE, 0, "value of fd1 and fd2 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");
if (lseek (fd2, 0, SEEK_SET) != 0)
error (EXIT_FAILURE, 0, "cannot reset position in file 2");
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");
/* No 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 flags;
int status;
/* 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
- three parameters left if called through re-execution
+ file descriptor number which is supposed to be closed
+ the open file descriptor
+ the name of the closed descriptor
*/
if (restart)
{
if (argc != 4)
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
return handle_restart (argv[1], argv[2], argv[3]);
}
if (argc != 2 && argc != 5)
error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
/* Prepare the test. We are creating two files: one which file descriptor
will be marked with FD_CLOEXEC, another which is not. */
/* Set the bit. */
flags = fcntl (temp_fd1, F_GETFD, 0);
if (flags < 0)
error (EXIT_FAILURE, errno, "cannot get flags");
flags |= FD_CLOEXEC;
if (fcntl (temp_fd1, F_SETFD, flags) < 0)
error (EXIT_FAILURE, errno, "cannot set flags");
/* 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");
/* We want to test the `exec' function. To do this we restart the program
with an additional parameter. But first create another process. */
pid = fork ();
if (pid == 0)
{
char fd1name[18];
char fd2name[18];
snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
/* This is the child. Construct the command line. */
if (argc == 5)
execl (argv[1], argv[1], argv[2], argv[3], argv[4], "--direct",
"--restart", fd1name, fd2name, name1, NULL);
else
execl (argv[1], argv[1], "--direct",
"--restart", fd1name, fd2name, name1, NULL);
error (EXIT_FAILURE, errno, "cannot exec");
}
else if (pid == (pid_t) -1)
error (EXIT_FAILURE, errno, "cannot fork");
/* 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;
}
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