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/* See LICENSE file for copyright and license details. */
#define _XOPEN_SOURCE 700
#include <errno.h>
#include <mntent.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <unistd.h>
static noreturn void
usage(void)
{
fprintf(stderr, "usage: shutdown [-hpr]\n");
exit(2);
}
int
main(int argc, char *argv[])
{
FILE *fp;
char **dirs = NULL;
size_t n = 0;
struct mntent *mnt;
int cmd = RB_POWER_OFF;
while (*++argv && (*argv)[0] == '-' && (*argv)[1]) {
switch ((*argv)[1]) {
case 'h':
cmd = RB_HALT_SYSTEM;
break;
case 'p':
cmd = RB_POWER_OFF;
break;
case 'r':
cmd = RB_AUTOBOOT;
break;
default:
usage();
}
}
if (*argv)
usage();
if (getsid(0) != getpid()) {
fprintf(stderr, "must be session leader\n");
return 1;
}
sync();
kill(-1, SIGTERM);
sleep(2);
kill(-1, SIGKILL);
sync();
fp = setmntent("/proc/mounts", "r");
if (!fp) {
perror("setmntent");
goto reboot;
}
while ((mnt = getmntent(fp))) {
if (!(dirs = realloc(dirs, ++n * sizeof(*dirs)))) {
perror("realloc");
break;
}
if (!(dirs[n - 1] = strdup(mnt->mnt_dir))) {
perror("strdup");
break;
}
}
endmntent(fp);
while (n) {
if (umount(dirs[--n]) < 0)
fprintf(stderr, "umount %s: %s\n", dirs[n], strerror(errno));
free(dirs[n]);
}
free(dirs);
reboot:
if (reboot(cmd) < 0) {
perror("reboot");
return 1;
}
}
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