glibc/posix/tst-exec.c

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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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<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;
}