minix/commands/tinyhalt/tinyhalt.c

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/* tinyhalt 1.0 - small forerunner Author: Kees J. Bot
*
* Disk space on the root file system is a scarce resource. This little
* program sits in /sbin. It normally calls the real halt/reboot, but if
* that isn't available then it simply calls reboot(). Can't do any logging
* of the event anyhow.
*/
#define nil 0
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
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int main(int argc, char **argv)
{
char *prog;
char *reboot_code = "delay; boot";
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/* Try to run the real McCoy. */
#if __minix_vmd
execv("/usr/sbin/halt", argv);
#else
execv("/usr/bin/halt", argv);
#endif
if ((prog = strrchr(*argv,'/')) == nil) prog= argv[0]; else prog++;
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sleep(1); /* Not too fast. */
signal(SIGHUP, SIG_IGN);
signal(SIGTERM, SIG_IGN);
kill(1, SIGTERM);
kill(-1, SIGTERM);
sleep(1);
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reboot(strcmp(prog, "reboot") == 0 ? RBT_MONITOR : RBT_HALT,
reboot_code, strlen(reboot_code));
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write(2, "reboot call failed\n", 19);
return 1;
}