minix/commands/reboot/halt.c
2005-04-21 14:53:53 +00:00

135 lines
2.7 KiB
C
Executable file

/* halt / reboot - halt or reboot system (depends on name)
halt - calling reboot() with RBT_HALT
reboot - calling reboot() with RBT_REBOOT
author: Edvard Tuinder v892231@si.hhs.NL
This program calls the library function reboot(2) which performs
the system-call do_reboot.
*/
#define _POSIX_SOURCE 1
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
void write_log _ARGS(( void ));
void usage _ARGS(( void ));
int main _ARGS(( int argc, char *argv[] ));
char *prog;
void
usage()
{
fprintf(stderr, "Usage: %s [-hrRf] [-x reboot-code]\n", prog);
exit(1);
}
int
main(argc,argv)
int argc;
char **argv;
{
int flag = -1; /* default action unknown */
int fast = 0; /* fast halt/reboot, don't bother being nice. */
int i;
struct stat dummy;
char *monitor_code = "";
pid_t pid;
if ((prog = strrchr(argv[0],'/')) == NULL) prog = argv[0]; else prog++;
if (strcmp(prog, "halt") == 0) flag = RBT_HALT;
if (strcmp(prog, "reboot") == 0) flag = RBT_REBOOT;
i = 1;
while (i < argc && argv[i][0] == '-') {
char *opt = argv[i++] + 1;
if (*opt == '-' && opt[1] == 0) break; /* -- */
while (*opt != 0) switch (*opt++) {
case 'h':
flag = RBT_HALT;
break;
case 'r':
flag = RBT_REBOOT;
break;
case 'R':
flag = RBT_RESET;
break;
case 'f':
fast = 1;
break;
case 'x':
flag = RBT_MONITOR;
if (*opt == 0) {
if (i == argc) usage();
opt = argv[i++];
}
monitor_code = opt;
opt = "";
break;
default:
usage();
}
}
if (i != argc) usage();
if (flag == -1) {
fprintf(stderr, "Don't know what to do when named '%s'\n", prog);
exit(1);
}
if (stat("/usr/bin", &dummy) < 0) {
/* It seems that /usr isn't present, let's assume "-f." */
fast = 1;
}
write_log();
if (fast) {
/* But not too fast... */
sleep(1);
} else {
/* Run the shutdown scripts. */
signal(SIGHUP, SIG_IGN);
signal(SIGTERM, SIG_IGN);
switch ((pid = fork())) {
case -1:
fprintf(stderr, "%s: can't fork(): %s\n", prog, strerror(errno));
exit(1);
case 0:
execl("/bin/sh", "sh", "/etc/rc", "down", (char *) NULL);
fprintf(stderr, "%s: can't execute: /bin/sh: %s\n",
prog, strerror(errno));
exit(1);
default:
while (waitpid(pid, NULL, 0) != pid) {}
}
/* Tell init to stop spawning getty's. */
kill(1, SIGTERM);
/* Give everybody a chance to die peacefully. */
kill(-1, SIGTERM);
sleep(3);
}
reboot(flag, monitor_code, strlen(monitor_code));
fprintf(stderr, "%s: reboot(): %s\n", strerror(errno));
return 1;
}