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/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define LEN(x) (sizeof (x) / sizeof *(x))
#define TIMEO 30
static void sigpoweroff(void);
static void sigreap(void);
static void sigreboot(void);
static void spawn(char *const []);
static struct {
int sig;
void (*handler)(void);
} sigmap[] = {
{ SIGUSR1, sigpoweroff },
{ SIGCHLD, sigreap },
{ SIGALRM, sigreap },
{ SIGINT, sigreboot },
};
/* See LICENSE file for copyright and license details. */
static char *const rcinitcmd[] = { "/bin/zsh", NULL };
static char *const rcrebootcmd[] = { "/bin/rc.shutdown", "reboot", NULL };
static char *const rcpoweroffcmd[] = { "/bin/rc.shutdown", "poweroff", NULL };
static sigset_t set;
int
main(void)
{
int sig;
size_t i;
if (getpid() != 1)
return 1;
chdir("/");
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, NULL);
spawn(rcinitcmd);
while (1) {
alarm(TIMEO);
sigwait(&set, &sig);
for (i = 0; i < LEN(sigmap); i++) {
if (sigmap[i].sig == sig) {
sigmap[i].handler();
break;
}
}
}
/* not reachable */
return 0;
}
static void
sigpoweroff(void)
{
spawn(rcpoweroffcmd);
}
static void
sigreap(void)
{
while (waitpid(-1, NULL, WNOHANG) > 0)
;
alarm(TIMEO);
}
static void
sigreboot(void)
{
spawn(rcrebootcmd);
}
static void
spawn(char *const argv[])
{
switch (fork()) {
case 0:
sigprocmask(SIG_UNBLOCK, &set, NULL);
setsid();
execvp(argv[0], argv);
perror("execvp");
_exit(1);
case -1:
perror("fork");
}
}
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