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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <X11/Xlib.h>
#include "arg.h"
#include "slstatus.h"
#include "util.h"
struct arg {
const char *(*func)(const char *);
const char *fmt;
const char *args;
unsigned int interval;
int signal;
};
char buf[1024];
static int sflag = 0;
static volatile sig_atomic_t done;
static Display *dpy;
#include "config.h"
#define MAXLEN CMDLEN * LEN(args)
static char statuses[LEN(args)][CMDLEN] = {0};
static void
difftimespec(struct timespec *res, struct timespec *a, struct timespec *b)
{
res->tv_sec = a->tv_sec - b->tv_sec - (a->tv_nsec < b->tv_nsec);
res->tv_nsec = a->tv_nsec - b->tv_nsec +
(a->tv_nsec < b->tv_nsec) * 1E9;
}
static void
usage(void)
{
die("usage: %s [-v] [-s] [-1]", argv0);
}
static void
printstatus(int it, int upsig)
{
size_t i;
int update = 0;
char status[MAXLEN];
const char *res;
for (i = 0; i < LEN(args); i++) {
if (!(((args[i].interval > 0 && it > 0 && !(it % args[i].interval)) && upsig < 0) ||
(upsig > -1 && args[i].signal == upsig) || (it == -1 && upsig == -1)))
continue;
update = 1;
if (!(res = args[i].func(args[i].args)))
res = unknown_str;
if (esnprintf(statuses[i], sizeof(statuses[i]), args[i].fmt, res) < 0)
break;
}
if (!update)
return;
status[0] = '\0';
for (i = 0; i < LEN(args); i++)
strcat(status, statuses[i]);
status[strlen(status)] = '\0';
if (sflag) {
puts(status);
fflush(stdout);
if (ferror(stdout))
die("puts:");
} else {
if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0)
die("XStoreName: Allocation failed");
XFlush(dpy);
}
}
static void
sighandler(const int signo)
{
if (signo <= SIGRTMAX && signo >= SIGRTMIN)
printstatus(-1, signo - SIGRTMIN);
else if (signo == SIGUSR1)
printstatus(-1, -1);
else
done = 1;
}
int
main(int argc, char *argv[])
{
struct sigaction act;
struct timespec start, current, diff, intspec, wait;
int i, ret, time = 0;
ARGBEGIN {
case 'v':
die("slstatus-"VERSION);
case '1':
done = 1;
/* FALLTHROUGH */
case 's':
sflag = 1;
break;
default:
usage();
} ARGEND
if (argc)
usage();
memset(&act, 0, sizeof(act));
act.sa_handler = sighandler;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGUSR1, &act, NULL);
for (i = SIGRTMIN; i <= SIGRTMAX; i++)
sigaction(i, &act, NULL);
if (!sflag && !(dpy = XOpenDisplay(NULL)))
die("XOpenDisplay: Failed to open display");
printstatus(-1, -1);
do {
if (clock_gettime(CLOCK_MONOTONIC, &start) < 0)
die("clock_gettime:");
printstatus(time++, -1);
if (!done) {
if (clock_gettime(CLOCK_MONOTONIC, ¤t) < 0)
die("clock_gettime:");
difftimespec(&diff, ¤t, &start);
intspec.tv_sec = interval / 1000;
intspec.tv_nsec = (interval % 1000) * 1E6;
difftimespec(&wait, &intspec, &diff);
do
ret = nanosleep(&wait, &wait);
while (wait.tv_sec >= 0 && ret < 0 && errno != EINTR && !done);
if (ret < 0 && errno != EINTR)
die("nanosleep:");
}
} while (!done);
if (!sflag) {
XStoreName(dpy, DefaultRootWindow(dpy), NULL);
if (XCloseDisplay(dpy) < 0)
die("XCloseDisplay: Failed to close display");
}
return 0;
}
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