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---
slstatus.c (2634B)
---
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 *b)
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 case '1':
62 done = 1;
63 /* FALLTHROUGH */
64 case 's':
65 sflag = 1;
66 break;
67 default:
68 usage();
69 } ARGEND
70
71 if (argc)
72 usage();
73
74 memset(&act, 0, sizeof(act));
75 act.sa_handler = terminate;
76 sigaction(SIGINT, &act, NULL);
77 sigaction(SIGTERM, &act, NULL);
78 act.sa_flags |= SA_RESTART;
79 sigaction(SIGUSR1, &act, NULL);
80
81 if (!sflag && !(dpy = XOpenDisplay(NULL)))
82 die("XOpenDisplay: Failed to open display");
83
84 do {
85 if (clock_gettime(CLOCK_MONOTONIC, &start) < 0)
86 die("clock_gettime:");
87
88 status[0] = '\0';
89 for (i = len = 0; i < LEN(args); i++) {
90 if (!(res = args[i].func(args[i].args)))
91 res = unknown_str;
92
93 if ((ret = esnprintf(status + len, sizeof(status) - len,
94 args[i].fmt, res)) < 0)
95 break;
96
97 len += ret;
98 }
99
100 if (sflag) {
101 puts(status);
102 fflush(stdout);
103 if (ferror(stdout))
104 die("puts:");
105 } else {
106 if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0)
107 die("XStoreName: Allocation failed");
108 XFlush(dpy);
109 }
110
111 if (!done) {
112 if (clock_gettime(CLOCK_MONOTONIC, ¤t) < 0)
113 die("clock_gettime:");
114 difftimespec(&diff, ¤t, &start);
115
116 intspec.tv_sec = interval / 1000;
117 intspec.tv_nsec = (interval % 1000) * 1E6;
118 difftimespec(&wait, &intspec, &diff);
119
120 if (wait.tv_sec >= 0 &&
121 nanosleep(&wait, NULL) < 0 &&
122 errno != EINTR)
123 die("nanosleep:");
124 }
125 } while (!done);
126
127 if (!sflag) {
128 XStoreName(dpy, DefaultRootWindow(dpy), NULL);
129 if (XCloseDisplay(dpy) < 0)
130 die("XCloseDisplay: Failed to close display");
131 }
132
133 return 0;
134 }