/*
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* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Test that /proc/loadavg correctly reports last pid in pid namespace. */
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#include <errno.h>
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#include <sched.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/wait.h>
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int main(void)
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{
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pid_t pid;
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int wstatus;
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if (unshare(CLONE_NEWPID) == -1) {
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if (errno == ENOSYS || errno == EPERM)
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return 4;
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return 1;
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}
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pid = fork();
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if (pid == -1)
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return 1;
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if (pid == 0) {
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char buf[128], *p;
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int fd;
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ssize_t rv;
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fd = open("/proc/loadavg" , O_RDONLY);
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if (fd == -1)
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return 1;
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rv = read(fd, buf, sizeof(buf));
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if (rv < 3)
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return 1;
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p = buf + rv;
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/* pid 1 */
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if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n'))
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return 1;
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pid = fork();
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if (pid == -1)
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return 1;
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if (pid == 0)
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return 0;
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if (waitpid(pid, NULL, 0) == -1)
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return 1;
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lseek(fd, 0, SEEK_SET);
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rv = read(fd, buf, sizeof(buf));
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if (rv < 3)
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return 1;
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p = buf + rv;
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/* pid 2 */
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if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n'))
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return 1;
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return 0;
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}
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if (waitpid(pid, &wstatus, 0) == -1)
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return 1;
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if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0)
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return 0;
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return 1;
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}
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