xref: /openbsd-src/usr.bin/tmux/log.c (revision b33a8d55775a3013157d6b0e3602c1fe178b48a6)
1 /* $OpenBSD: log.c,v 1.15 2015/09/01 19:14:43 nicm Exp $ */
2 
3 /*
4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <sys/types.h>
20 
21 #include <errno.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <vis.h>
26 
27 #include "tmux.h"
28 
29 FILE	*log_file;
30 
31 void	 log_event_cb(int, const char *);
32 void	 log_vwrite(const char *, va_list);
33 
34 /* Log callback for libevent. */
35 void
36 log_event_cb(unused int severity, const char *msg)
37 {
38 	log_debug("%s", msg);
39 }
40 
41 /* Open logging to file. */
42 void
43 log_open(const char *path)
44 {
45 	log_file = fopen(path, "w");
46 	if (log_file == NULL)
47 		return;
48 
49 	setvbuf(log_file, NULL, _IOLBF, 0);
50 	event_set_log_callback(log_event_cb);
51 
52 	tzset();
53 }
54 
55 /* Close logging. */
56 void
57 log_close(void)
58 {
59 	if (log_file != NULL)
60 		fclose(log_file);
61 	log_file = NULL;
62 
63 	event_set_log_callback(NULL);
64 }
65 
66 /* Write a log message. */
67 void
68 log_vwrite(const char *msg, va_list ap)
69 {
70 	char		*fmt, *out;
71 	struct timeval	 tv;
72 
73 	if (log_file == NULL)
74 		return;
75 
76 	if (vasprintf(&fmt, msg, ap) == -1)
77 		exit(1);
78 	if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1)
79 		exit(1);
80 
81 	gettimeofday(&tv, NULL);
82 	if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec,
83 	    (int)tv.tv_usec, out) == -1)
84 		exit(1);
85 	fflush(log_file);
86 
87 	free(out);
88 	free(fmt);
89 }
90 
91 /* Log a debug message. */
92 void
93 log_debug(const char *msg, ...)
94 {
95 	va_list	ap;
96 
97 	va_start(ap, msg);
98 	log_vwrite(msg, ap);
99 	va_end(ap);
100 }
101 
102 /* Log a critical error with error string and die. */
103 __dead void
104 log_fatal(const char *msg, ...)
105 {
106 	char	*fmt;
107 	va_list	 ap;
108 
109 	va_start(ap, msg);
110 	if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1)
111 		exit(1);
112 	log_vwrite(fmt, ap);
113 	exit(1);
114 }
115 
116 /* Log a critical error and die. */
117 __dead void
118 log_fatalx(const char *msg, ...)
119 {
120 	char	*fmt;
121 	va_list	 ap;
122 
123 	va_start(ap, msg);
124 	if (asprintf(&fmt, "fatal: %s", msg) == -1)
125 		exit(1);
126 	log_vwrite(fmt, ap);
127 	exit(1);
128 }
129