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	sinit.c - sinit - suckless init
	git clone git://git.suckless.org/sinit
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	---
	sinit.c (1362B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/types.h>
	3 #include <sys/wait.h>
	4
	5 #include <signal.h>
	6 #include <stdio.h>
	7 #include <stdlib.h>
	8 #include <unistd.h>
	9
	10 #define LEN(x) (sizeof (x) / sizeof *(x))
	11 #define TIMEO 30
	12
	13 static void sigpoweroff(void);
	14 static void sigreap(void);
	15 static void sigreboot(void);
	16 static void spawn(char *const []);
	17
	18 static struct {
	19 int sig;
	20 void (*handler)(void);
	21 } sigmap[] = {
	22 { SIGUSR1, sigpoweroff },
	23 { SIGCHLD, sigreap },
	24 { SIGALRM, sigreap },
	25 { SIGINT, sigreboot },
	26 };
	27
	28 #include "config.h"
	29
	30 static sigset_t set;
	31
	32 int
	33 main(void)
	34 {
	35 int sig;
	36 size_t i;
	37
	38 if (getpid() != 1)
	39 return 1;
	40 chdir("/");
	41 sigfillset(&set);
	42 sigprocmask(SIG_BLOCK, &set, NULL);
	43 spawn(rcinitcmd);
	44 while (1) {
	45 alarm(TIMEO);
	46 sigwait(&set, &sig);
	47 for (i = 0; i < LEN(sigmap); i++) {
	48 if (sigmap[i].sig == sig) {
	49 sigmap[i].handler();
	50 break;
	51 }
	52 }
	53 }
	54 /* not reachable */
	55 return 0;
	56 }
	57
	58 static void
	59 sigpoweroff(void)
	60 {
	61 spawn(rcpoweroffcmd);
	62 }
	63
	64 static void
	65 sigreap(void)
	66 {
	67 while (waitpid(-1, NULL, WNOHANG) > 0)
	68 ;
	69 alarm(TIMEO);
	70 }
	71
	72 static void
	73 sigreboot(void)
	74 {
	75 spawn(rcrebootcmd);
	76 }
	77
	78 static void
	79 spawn(char *const argv[])
	80 {
	81 switch (fork()) {
	82 case 0:
	83 sigprocmask(SIG_UNBLOCK, &set, NULL);
	84 setsid();
	85 execvp(argv[0], argv);
	86 perror("execvp");
	87 _exit(1);
	88 case -1:
	89 perror("fork");
	90 }
	91 }