80fc20d1d6
Given slstatus is a tool that runs in the background, most likely run from .xinitrc, it's important to prepend the name of the tool to error messages so it becomes clear where the error is coming from. To make this much more consistent, this commit adds warn() and die() utility functions consistent with other suckless projects and adapts all calls to fprintf(stderr, *) to the warn() and die() functions, greatly increasing the readability of the code.
141 lines
2.6 KiB
C
141 lines
2.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <X11/Xlib.h>
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#include "arg.h"
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#include "slstatus.h"
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#include "util.h"
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struct arg {
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const char *(*func)();
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const char *fmt;
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const char *args;
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};
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char buf[1024];
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static int done;
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static Display *dpy;
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#include "config.h"
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static void
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terminate(const int signo)
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{
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(void)signo;
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done = 1;
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}
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static void
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difftimespec(struct timespec *res, struct timespec *a, struct timespec *b)
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{
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res->tv_sec = a->tv_sec - b->tv_sec - (a->tv_nsec < b->tv_nsec);
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res->tv_nsec = a->tv_nsec - b->tv_nsec +
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(a->tv_nsec < b->tv_nsec) * 1000000000;
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}
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static void
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usage(void)
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{
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die("usage: %s [-s]", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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struct sigaction act;
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struct timespec start, current, diff, intspec, wait;
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size_t i, len;
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int sflag, ret;
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char status[MAXLEN];
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const char *res;
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sflag = 0;
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ARGBEGIN {
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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} ARGEND
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if (argc) {
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usage();
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}
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memset(&act, 0, sizeof(act));
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act.sa_handler = terminate;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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if (sflag) {
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setbuf(stdout, NULL);
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}
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if (!sflag && !(dpy = XOpenDisplay(NULL))) {
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die("XOpenDisplay: Failed to open display");
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}
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while (!done) {
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if (clock_gettime(CLOCK_MONOTONIC, &start) < 0) {
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die("clock_gettime:");
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}
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status[0] = '\0';
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for (i = len = 0; i < LEN(args); i++) {
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if (!(res = args[i].func(args[i].args))) {
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res = unknown_str;
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}
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if ((ret = snprintf(status + len, sizeof(status) - len,
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args[i].fmt, res)) < 0) {
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warn("snprintf:");
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break;
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} else if ((size_t)ret >= sizeof(status) - len) {
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warn("snprintf: Output truncated");
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break;
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}
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len += ret;
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}
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if (sflag) {
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printf("%s\n", status);
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} else {
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if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0) {
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die("XStoreName: Allocation failed");
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}
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XFlush(dpy);
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}
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if (!done) {
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if (clock_gettime(CLOCK_MONOTONIC, ¤t) < 0) {
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die("clock_gettime:");
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}
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difftimespec(&diff, ¤t, &start);
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intspec.tv_sec = interval / 1000;
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intspec.tv_nsec = (interval % 1000) * 1000000;
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difftimespec(&wait, &intspec, &diff);
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if (wait.tv_sec >= 0) {
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if (nanosleep(&wait, NULL) < 0 &&
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errno != EINTR) {
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die("nanosleep:");
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}
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}
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}
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}
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if (!sflag) {
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XStoreName(dpy, DefaultRootWindow(dpy), NULL);
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if (XCloseDisplay(dpy) < 0) {
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die("XCloseDisplay: Failed to close display");
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}
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}
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return 0;
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}
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