1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
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 <unistd.h>
26
27 #include "tmux.h"
28
29 static FILE *log_file;
30 static int log_level;
31
32 /* Log callback for libevent. */
33 static void
log_event_cb(__unused int severity,const char * msg)34 log_event_cb(__unused int severity, const char *msg)
35 {
36 log_debug("%s", msg);
37 }
38
39 /* Increment log level. */
40 void
log_add_level(void)41 log_add_level(void)
42 {
43 log_level++;
44 }
45
46 /* Get log level. */
47 int
log_get_level(void)48 log_get_level(void)
49 {
50 return (log_level);
51 }
52
53 /* Open logging to file. */
54 void
log_open(const char * name)55 log_open(const char *name)
56 {
57 char *path;
58
59 if (log_level == 0)
60 return;
61 log_close();
62
63 xasprintf(&path, "tmux-%s-%ld.log", name, (long)getpid());
64 log_file = fopen(path, "a");
65 free(path);
66 if (log_file == NULL)
67 return;
68
69 setvbuf(log_file, NULL, _IOLBF, 0);
70 event_set_log_callback(log_event_cb);
71 }
72
73 /* Toggle logging. */
74 void
log_toggle(const char * name)75 log_toggle(const char *name)
76 {
77 if (log_level == 0) {
78 log_level = 1;
79 log_open(name);
80 log_debug("log opened");
81 } else {
82 log_debug("log closed");
83 log_level = 0;
84 log_close();
85 }
86 }
87
88 /* Close logging. */
89 void
log_close(void)90 log_close(void)
91 {
92 if (log_file != NULL)
93 fclose(log_file);
94 log_file = NULL;
95
96 event_set_log_callback(NULL);
97 }
98
99 /* Write a log message. */
100 static void printflike(1, 0)
log_vwrite(const char * msg,va_list ap,const char * prefix)101 log_vwrite(const char *msg, va_list ap, const char *prefix)
102 {
103 char *s, *out;
104 struct timeval tv;
105
106 if (log_file == NULL)
107 return;
108
109 if (vasprintf(&s, msg, ap) == -1)
110 return;
111 if (stravis(&out, s, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) {
112 free(s);
113 return;
114 }
115 free(s);
116
117 gettimeofday(&tv, NULL);
118 if (fprintf(log_file, "%lld.%06d %s%s\n", (long long)tv.tv_sec,
119 (int)tv.tv_usec, prefix, out) != -1)
120 fflush(log_file);
121 free(out);
122 }
123
124 /* Log a debug message. */
125 void
log_debug(const char * msg,...)126 log_debug(const char *msg, ...)
127 {
128 va_list ap;
129
130 if (log_file == NULL)
131 return;
132
133 va_start(ap, msg);
134 log_vwrite(msg, ap, "");
135 va_end(ap);
136 }
137
138 #if __GNUC_PREREQ__(4, 6) || defined(__clang__)
139 #pragma GCC diagnostic push
140 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
141 #endif
142
143 /* Log a critical error with error string and die. */
144 __dead void
fatal(const char * msg,...)145 fatal(const char *msg, ...)
146 {
147 char tmp[256];
148 va_list ap;
149
150 if (snprintf(tmp, sizeof tmp, "fatal: %s: ", strerror(errno)) < 0)
151 exit(1);
152
153 va_start(ap, msg);
154 log_vwrite(msg, ap, tmp);
155 va_end(ap);
156
157 exit(1);
158 }
159
160 /* Log a critical error and die. */
161 __dead void
fatalx(const char * msg,...)162 fatalx(const char *msg, ...)
163 {
164 va_list ap;
165
166 va_start(ap, msg);
167 log_vwrite(msg, ap, "fatal: ");
168 va_end(ap);
169
170 exit(1);
171 }
172
173 #if __GNUC_PREREQ__(4, 6) || defined(__clang__)
174 #pragma GCC diagnostic pop
175 #endif
176