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	slstatus.c - slstatus - status monitor
	git clone git://git.suckless.org/slstatus
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	---
	slstatus.c (2643B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <errno.h>
	3 #include <signal.h>
	4 #include <stdio.h>
	5 #include <stdlib.h>
	6 #include <string.h>
	7 #include <time.h>
	8 #include <X11/Xlib.h>
	9
	10 #include "arg.h"
	11 #include "slstatus.h"
	12 #include "util.h"
	13
	14 struct arg {
	15 const char (func)(const char *);
	16 const char *fmt;
	17 const char *args;
	18 };
	19
	20 char buf[1024];
	21 static volatile sig_atomic_t done;
	22 static Display *dpy;
	23
	24 #include "config.h"
	25
	26 static void
	27 terminate(const int signo)
	28 {
	29 if (signo != SIGUSR1)
	30 done = 1;
	31 }
	32
	33 static void
	34 difftimespec(struct timespec res, struct timespec a, struct timespec *…
	35 {
	36 res->tv_sec = a->tv_sec - b->tv_sec - (a->tv_nsec < b->tv_nsec);
	37 res->tv_nsec = a->tv_nsec - b->tv_nsec +
	38 (a->tv_nsec < b->tv_nsec) * 1E9;
	39 }
	40
	41 static void
	42 usage(void)
	43 {
	44 die("usage: %s [-v] [-s] [-1]", argv0);
	45 }
	46
	47 int
	48 main(int argc, char *argv[])
	49 {
	50 struct sigaction act;
	51 struct timespec start, current, diff, intspec, wait;
	52 size_t i, len;
	53 int sflag, ret;
	54 char status[MAXLEN];
	55 const char *res;
	56
	57 sflag = 0;
	58 ARGBEGIN {
	59 case 'v':
	60 die("slstatus-"VERSION);
	61 break;
	62 case '1':
	63 done = 1;
	64 /* FALLTHROUGH */
	65 case 's':
	66 sflag = 1;
	67 break;
	68 default:
	69 usage();
	70 } ARGEND
	71
	72 if (argc)
	73 usage();
	74
	75 memset(&act, 0, sizeof(act));
	76 act.sa_handler = terminate;
	77 sigaction(SIGINT, &act, NULL);
	78 sigaction(SIGTERM, &act, NULL);
	79 act.sa_flags \|= SA_RESTART;
	80 sigaction(SIGUSR1, &act, NULL);
	81
	82 if (!sflag && !(dpy = XOpenDisplay(NULL)))
	83 die("XOpenDisplay: Failed to open display");
	84
	85 do {
	86 if (clock_gettime(CLOCK_MONOTONIC, &start) < 0)
	87 die("clock_gettime:");
	88
	89 status[0] = '\0';
	90 for (i = len = 0; i < LEN(args); i++) {
	91 if (!(res = args[i].func(args[i].args)))
	92 res = unknown_str;
	93
	94 if ((ret = esnprintf(status + len, sizeof(status…
	95 args[i].fmt, res)) < 0)
	96 break;
	97
	98 len += ret;
	99 }
	100
	101 if (sflag) {
	102 puts(status);
	103 fflush(stdout);
	104 if (ferror(stdout))
	105 die("puts:");
	106 } else {
	107 if (XStoreName(dpy, DefaultRootWindow(dpy), stat…
	108 die("XStoreName: Allocation failed");
	109 XFlush(dpy);
	110 }
	111
	112 if (!done) {
	113 if (clock_gettime(CLOCK_MONOTONIC, &current) < 0)
	114 die("clock_gettime:");
	115 difftimespec(&diff, &current, &start);
	116
	117 intspec.tv_sec = interval / 1000;
	118 intspec.tv_nsec = (interval % 1000) * 1E6;
	119 difftimespec(&wait, &intspec, &diff);
	120
	121 if (wait.tv_sec >= 0 &&
	122 nanosleep(&wait, NULL) < 0 &&
	123 errno != EINTR)
	124 die("nanosleep:");
	125 }
	126 } while (!done);
	127
	128 if (!sflag) {
	129 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
	130 if (XCloseDisplay(dpy) < 0)
	131 die("XCloseDisplay: Failed to close display");
	132 }
	133
	134 return 0;
	135 }