1 /* $OpenBSD: log.c,v 1.31 2022/05/30 12:55:25 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, const char *prefix) 103 { 104 char *s, *out; 105 struct timeval tv; 106 107 if (log_file == NULL) 108 return; 109 110 if (vasprintf(&s, msg, ap) == -1) 111 return; 112 if (stravis(&out, s, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) { 113 free(s); 114 return; 115 } 116 free(s); 117 118 gettimeofday(&tv, NULL); 119 if (fprintf(log_file, "%lld.%06d %s%s\n", (long long)tv.tv_sec, 120 (int)tv.tv_usec, prefix, out) != -1) 121 fflush(log_file); 122 free(out); 123 } 124 125 /* Log a debug message. */ 126 void 127 log_debug(const char *msg, ...) 128 { 129 va_list ap; 130 131 if (log_file == NULL) 132 return; 133 134 va_start(ap, msg); 135 log_vwrite(msg, ap, ""); 136 va_end(ap); 137 } 138 139 /* Log a critical error with error string and die. */ 140 __dead void 141 fatal(const char *msg, ...) 142 { 143 char tmp[256]; 144 va_list ap; 145 146 if (snprintf(tmp, sizeof tmp, "fatal: %s: ", strerror(errno)) < 0) 147 exit(1); 148 149 va_start(ap, msg); 150 log_vwrite(msg, ap, tmp); 151 va_end(ap); 152 153 exit(1); 154 } 155 156 /* Log a critical error and die. */ 157 __dead void 158 fatalx(const char *msg, ...) 159 { 160 va_list ap; 161 162 va_start(ap, msg); 163 log_vwrite(msg, ap, "fatal: "); 164 va_end(ap); 165 166 exit(1); 167 } 168