usr/utils/halt.c

#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/reboot.h>
#include <klibc/compiler.h>

static __noreturn usage(void)
{
       static char mesg[] = "Usage: {halt|reboot|poweroff} [-n]\n";
       write(2, mesg, sizeof(mesg) - 1);
       exit(1);
}

int main(int argc, char *argv[])
{
       int cmd = 0; /* initalize to shut gcc up */
       int do_sync = 1;
       char *ptr, *ptr2;

       /* Which action (program name)? */
       ptr2 = ptr = argv[0];
       while (*ptr2)
               if (*ptr2++ == '/')
                       ptr = ptr2;
       if (*ptr == 'r')
               cmd = LINUX_REBOOT_CMD_RESTART;
       else if (*ptr == 'h')
               cmd = LINUX_REBOOT_CMD_HALT;
       else if (*ptr == 'p')
               cmd = LINUX_REBOOT_CMD_POWER_OFF;
       else
               usage();

       /* Walk options */
       while (*++argv && **argv == '-')
               switch (*++*argv) {
                       case 'f': break; /* -f assumed */
                       case 'n': do_sync = 0; break;
                       default:
                               usage();
               }
       if (*argv)
               usage(); /* any args == error */

       if (do_sync)
               sync();
       reboot(LINUX_REBOOT_CMD_CAD_OFF); /* Enable CTRL+ALT+DEL */
       if (!reboot(cmd)) {
               /* Success. Currently, CMD_HALT returns, so stop the world */
               /* kill(-1, SIGSTOP); */
               kill(getpid(), SIGSTOP);
       }
       write(2, "failed.\n", 8);
       return 1;
}
1	#include <stdlib.h>
2	#include <unistd.h>
3	#include <signal.h>
4	#include <sys/reboot.h>
5	#include <klibc/compiler.h>
6
7	static __noreturn usage(void)
8	{
9	static char mesg[] = "Usage: {halt\|reboot\|poweroff} [-n]\n";
10	write(2, mesg, sizeof(mesg) - 1);
11	exit(1);
12	}
13
14	int main(int argc, char *argv[])
15	{
16	int cmd = 0; /* initalize to shut gcc up */
17	int do_sync = 1;
18	char ptr, ptr2;
19
20	/* Which action (program name)? */
21	ptr2 = ptr = argv[0];
22	while (*ptr2)
23	if (*ptr2++ == '/')
24	ptr = ptr2;
25	if (*ptr == 'r')
26	cmd = LINUX_REBOOT_CMD_RESTART;
27	else if (*ptr == 'h')
28	cmd = LINUX_REBOOT_CMD_HALT;
29	else if (*ptr == 'p')
30	cmd = LINUX_REBOOT_CMD_POWER_OFF;
31	else
32	usage();
33
34	/* Walk options */
35	while (++argv && *argv == '-')
36	switch (++argv) {
37	case 'f': break; /* -f assumed */
38	case 'n': do_sync = 0; break;
39	default:
40	usage();
41	}
42	if (*argv)
43	usage(); /* any args == error */
44
45	if (do_sync)
46	sync();
47	reboot(LINUX_REBOOT_CMD_CAD_OFF); /* Enable CTRL+ALT+DEL */
48	if (!reboot(cmd)) {
49	/* Success. Currently, CMD_HALT returns, so stop the world */
50	/* kill(-1, SIGSTOP); */
51	kill(getpid(), SIGSTOP);
52	}
53	write(2, "failed.\n", 8);
54	return 1;
55	}