1 /* $OpenBSD: log.c,v 1.28 2021/08/25 07:09:30 nicm Exp $ */ 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 #include <vis.h> 27 28 #include "tmux.h" 29 30 static FILE *log_file; 31 static int log_level; 32 33 /* Log callback for libevent. */ 34 static void 35 log_event_cb(__unused int severity, const char *msg) 36 { 37 log_debug("%s", msg); 38 } 39 40 /* Increment log level. */ 41 void 42 log_add_level(void) 43 { 44 log_level++; 45 } 46 47 /* Get log level. */ 48 int 49 log_get_level(void) 50 { 51 return (log_level); 52 } 53 54 /* Open logging to file. */ 55 void 56 log_open(const char *name) 57 { 58 char *path; 59 60 if (log_level == 0) 61 return; 62 log_close(); 63 64 xasprintf(&path, "tmux-%s-%ld.log", name, (long)getpid()); 65 log_file = fopen(path, "a"); 66 free(path); 67 if (log_file == NULL) 68 return; 69 70 setvbuf(log_file, NULL, _IOLBF, 0); 71 event_set_log_callback(log_event_cb); 72 } 73 74 /* Toggle logging. */ 75 void 76 log_toggle(const char *name) 77 { 78 if (log_level == 0) { 79 log_level = 1; 80 log_open(name); 81 log_debug("log opened"); 82 } else { 83 log_debug("log closed"); 84 log_level = 0; 85 log_close(); 86 } 87 } 88 89 /* Close logging. */ 90 void 91 log_close(void) 92 { 93 if (log_file != NULL) 94 fclose(log_file); 95 log_file = NULL; 96 97 event_set_log_callback(NULL); 98 } 99 100 /* Write a log message. */ 101 static void printflike(1, 0) 102 log_vwrite(const char *msg, va_list ap) 103 { 104 char *fmt, *out; 105 struct timeval tv; 106 107 if (log_file == NULL) 108 return; 109 110 if (vasprintf(&fmt, msg, ap) == -1) 111 return; 112 if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) { 113 free(fmt); 114 return; 115 } 116 117 gettimeofday(&tv, NULL); 118 if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec, 119 (int)tv.tv_usec, out) != -1) 120 fflush(log_file); 121 122 free(out); 123 free(fmt); 124 } 125 126 /* Log a debug message. */ 127 void 128 log_debug(const char *msg, ...) 129 { 130 va_list ap; 131 132 if (log_file == NULL) 133 return; 134 135 va_start(ap, msg); 136 log_vwrite(msg, ap); 137 va_end(ap); 138 } 139 140 /* Log a critical error with error string and die. */ 141 __dead void 142 fatal(const char *msg, ...) 143 { 144 char *fmt; 145 va_list ap; 146 147 va_start(ap, msg); 148 if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1) 149 exit(1); 150 log_vwrite(fmt, ap); 151 va_end(ap); 152 exit(1); 153 } 154 155 /* Log a critical error and die. */ 156 __dead void 157 fatalx(const char *msg, ...) 158 { 159 char *fmt; 160 va_list ap; 161 162 va_start(ap, msg); 163 if (asprintf(&fmt, "fatal: %s", msg) == -1) 164 exit(1); 165 log_vwrite(fmt, ap); 166 va_end(ap); 167 exit(1); 168 } 169