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 static void log_event_cb(int, const char *); 33 static void log_vwrite(const char *, va_list) printflike(1, 0); 34 35 /* Log callback for libevent. */ 36 static void 37 log_event_cb(__unused int severity, const char *msg) 38 { 39 log_debug("%s", msg); 40 } 41 42 /* Increment log level. */ 43 void 44 log_add_level(void) 45 { 46 log_level++; 47 } 48 49 /* Get log level. */ 50 int 51 log_get_level(void) 52 { 53 return (log_level); 54 } 55 56 /* Open logging to file. */ 57 void 58 log_open(const char *name) 59 { 60 char *path; 61 62 if (log_level == 0) 63 return; 64 log_close(); 65 66 xasprintf(&path, "tmux-%s-%ld.log", name, (long)getpid()); 67 log_file = fopen(path, "a"); 68 free(path); 69 if (log_file == NULL) 70 return; 71 72 setvbuf(log_file, NULL, _IOLBF, 0); 73 event_set_log_callback(log_event_cb); 74 } 75 76 /* Toggle logging. */ 77 void 78 log_toggle(const char *name) 79 { 80 if (log_level == 0) { 81 log_level = 1; 82 log_open(name); 83 log_debug("log opened"); 84 } else { 85 log_debug("log closed"); 86 log_level = 0; 87 log_close(); 88 } 89 } 90 91 /* Close logging. */ 92 void 93 log_close(void) 94 { 95 if (log_file != NULL) 96 fclose(log_file); 97 log_file = NULL; 98 99 event_set_log_callback(NULL); 100 } 101 102 /* Write a log message. */ 103 static void 104 log_vwrite(const char *msg, va_list ap) 105 { 106 char *fmt, *out; 107 struct timeval tv; 108 109 if (log_file == NULL) 110 return; 111 112 if (vasprintf(&fmt, msg, ap) == -1) 113 return; 114 if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) { 115 free(fmt); 116 return; 117 } 118 119 gettimeofday(&tv, NULL); 120 if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec, 121 (int)tv.tv_usec, out) != -1) 122 fflush(log_file); 123 124 free(out); 125 free(fmt); 126 } 127 128 /* Log a debug message. */ 129 void 130 log_debug(const char *msg, ...) 131 { 132 va_list ap; 133 134 if (log_file == NULL) 135 return; 136 137 va_start(ap, msg); 138 log_vwrite(msg, ap); 139 va_end(ap); 140 } 141 142 #if __GNUC_PREREQ__(4, 6) || defined(__clang__) 143 #pragma GCC diagnostic push 144 #pragma GCC diagnostic ignored "-Wformat-nonliteral" 145 #endif 146 147 /* Log a critical error with error string and die. */ 148 __dead void 149 fatal(const char *msg, ...) 150 { 151 char *fmt; 152 va_list ap; 153 154 va_start(ap, msg); 155 if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1) 156 exit(1); 157 log_vwrite(fmt, ap); 158 va_end(ap); 159 exit(1); 160 } 161 162 /* Log a critical error and die. */ 163 __dead void 164 fatalx(const char *msg, ...) 165 { 166 char *fmt; 167 va_list ap; 168 169 va_start(ap, msg); 170 if (asprintf(&fmt, "fatal: %s", msg) == -1) 171 exit(1); 172 log_vwrite(fmt, ap); 173 va_end(ap); 174 exit(1); 175 } 176 177 #if __GNUC_PREREQ__(4, 6) || defined(__clang__) 178 #pragma GCC diagnostic pop 179 #endif 180