83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/*
|
|
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
/* Test that /proc/loadavg correctly reports last pid in pid namespace. */
|
|
#include <errno.h>
|
|
#include <sched.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sys/wait.h>
|
|
|
|
int main(void)
|
|
{
|
|
pid_t pid;
|
|
int wstatus;
|
|
|
|
if (unshare(CLONE_NEWPID) == -1) {
|
|
if (errno == ENOSYS || errno == EPERM)
|
|
return 2;
|
|
return 1;
|
|
}
|
|
|
|
pid = fork();
|
|
if (pid == -1)
|
|
return 1;
|
|
if (pid == 0) {
|
|
char buf[128], *p;
|
|
int fd;
|
|
ssize_t rv;
|
|
|
|
fd = open("/proc/loadavg" , O_RDONLY);
|
|
if (fd == -1)
|
|
return 1;
|
|
rv = read(fd, buf, sizeof(buf));
|
|
if (rv < 3)
|
|
return 1;
|
|
p = buf + rv;
|
|
|
|
/* pid 1 */
|
|
if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n'))
|
|
return 1;
|
|
|
|
pid = fork();
|
|
if (pid == -1)
|
|
return 1;
|
|
if (pid == 0)
|
|
return 0;
|
|
if (waitpid(pid, NULL, 0) == -1)
|
|
return 1;
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
|
rv = read(fd, buf, sizeof(buf));
|
|
if (rv < 3)
|
|
return 1;
|
|
p = buf + rv;
|
|
|
|
/* pid 2 */
|
|
if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n'))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (waitpid(pid, &wstatus, 0) == -1)
|
|
return 1;
|
|
if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0)
|
|
return 0;
|
|
return 1;
|
|
}
|