110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "tests.h"
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/wait.h>
|
|
|
|
static inline int
|
|
logit_(const char *const str)
|
|
{
|
|
return !chdir(str);
|
|
}
|
|
|
|
#define prefix "vfork-f."
|
|
#define logit(arg) logit_(prefix arg)
|
|
|
|
int main(int ac, char **av)
|
|
{
|
|
if (ac < 1)
|
|
return 1;
|
|
if (ac > 1) {
|
|
if (read(0, &ac, sizeof(int)))
|
|
return 2;
|
|
return logit("exec");
|
|
}
|
|
|
|
logit("start");
|
|
|
|
int child_wait_fds[2];
|
|
(void) close(0);
|
|
if (pipe(child_wait_fds))
|
|
perror_msg_and_fail("pipe");
|
|
if (fcntl(child_wait_fds[1], F_SETFD, FD_CLOEXEC))
|
|
perror_msg_and_fail("fcntl");
|
|
|
|
int parent_wait_fds[2];
|
|
if (pipe(parent_wait_fds))
|
|
perror_msg_and_fail("pipe");
|
|
if (fcntl(parent_wait_fds[0], F_SETFD, FD_CLOEXEC))
|
|
perror_msg_and_fail("fcntl");
|
|
if (fcntl(parent_wait_fds[1], F_SETFD, FD_CLOEXEC))
|
|
perror_msg_and_fail("fcntl");
|
|
|
|
char *const args[] = { av[0], (char *) "", NULL };
|
|
pid_t pid = vfork();
|
|
|
|
if (pid < 0)
|
|
perror_msg_and_fail("vfork");
|
|
|
|
if (!pid) {
|
|
if (logit("child") || execve(args[0], args, args + 1))
|
|
_exit(2);
|
|
}
|
|
|
|
close(0);
|
|
close(parent_wait_fds[1]);
|
|
|
|
if (read(parent_wait_fds[0], &parent_wait_fds[1], sizeof(int)))
|
|
perror_msg_and_fail("read");
|
|
logit("parent");
|
|
close(child_wait_fds[1]);
|
|
|
|
int status;
|
|
assert(wait(&status) == pid);
|
|
assert(status == 0);
|
|
|
|
pid_t ppid = getpid();
|
|
logit("finish");
|
|
|
|
printf("%-5d chdir(\"%sstart\") = -1 ENOENT (%m)\n"
|
|
"%-5d chdir(\"%schild\") = -1 ENOENT (%m)\n"
|
|
"%-5d chdir(\"%sparent\") = -1 ENOENT (%m)\n"
|
|
"%-5d chdir(\"%sexec\") = -1 ENOENT (%m)\n"
|
|
"%-5d chdir(\"%sfinish\") = -1 ENOENT (%m)\n",
|
|
ppid, prefix,
|
|
pid, prefix,
|
|
ppid, prefix,
|
|
pid, prefix,
|
|
ppid, prefix);
|
|
return 0;
|
|
}
|