xref: /openbsd-src/usr.bin/tmux/log.c (revision 25f90b54fc586187d792f4d69f508f5b665df1c4)
1 /* $OpenBSD: log.c,v 1.17 2015/09/24 12:03:58 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 	if (log_file != NULL)
46 		fclose(log_file);
47 
48 	log_file = fopen(path, "w");
49 	if (log_file == NULL)
50 		return;
51 
52 	setvbuf(log_file, NULL, _IOLBF, 0);
53 	event_set_log_callback(log_event_cb);
54 }
55 
56 /* Close logging. */
57 void
58 log_close(void)
59 {
60 	if (log_file != NULL)
61 		fclose(log_file);
62 	log_file = NULL;
63 
64 	event_set_log_callback(NULL);
65 }
66 
67 /* Write a log message. */
68 void
69 log_vwrite(const char *msg, va_list ap)
70 {
71 	char		*fmt, *out;
72 	struct timeval	 tv;
73 
74 	if (log_file == NULL)
75 		return;
76 
77 	if (vasprintf(&fmt, msg, ap) == -1)
78 		exit(1);
79 	if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1)
80 		exit(1);
81 
82 	gettimeofday(&tv, NULL);
83 	if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec,
84 	    (int)tv.tv_usec, out) == -1)
85 		exit(1);
86 	fflush(log_file);
87 
88 	free(out);
89 	free(fmt);
90 }
91 
92 /* Log a debug message. */
93 void
94 log_debug(const char *msg, ...)
95 {
96 	va_list	ap;
97 
98 	va_start(ap, msg);
99 	log_vwrite(msg, ap);
100 	va_end(ap);
101 }
102 
103 /* Log a critical error with error string and die. */
104 __dead void
105 log_fatal(const char *msg, ...)
106 {
107 	char	*fmt;
108 	va_list	 ap;
109 
110 	va_start(ap, msg);
111 	if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1)
112 		exit(1);
113 	log_vwrite(fmt, ap);
114 	exit(1);
115 }
116 
117 /* Log a critical error and die. */
118 __dead void
119 log_fatalx(const char *msg, ...)
120 {
121 	char	*fmt;
122 	va_list	 ap;
123 
124 	va_start(ap, msg);
125 	if (asprintf(&fmt, "fatal: %s", msg) == -1)
126 		exit(1);
127 	log_vwrite(fmt, ap);
128 	exit(1);
129 }
130