1 /* $OpenBSD: log.c,v 1.23 2016/01/19 15:59:12 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 static void log_event_cb(int, const char *); 34 static void log_vwrite(const char *, va_list); 35 36 /* Log callback for libevent. */ 37 static void 38 log_event_cb(__unused int severity, const char *msg) 39 { 40 log_debug("%s", msg); 41 } 42 43 /* Increment log level. */ 44 void 45 log_add_level(void) 46 { 47 log_level++; 48 } 49 50 /* Get log level. */ 51 int 52 log_get_level(void) 53 { 54 return (log_level); 55 } 56 57 /* Open logging to file. */ 58 void 59 log_open(const char *name) 60 { 61 char *path; 62 63 if (log_level == 0) 64 return; 65 66 if (log_file != NULL) 67 fclose(log_file); 68 69 xasprintf(&path, "tmux-%s-%ld.log", name, (long)getpid()); 70 log_file = fopen(path, "w"); 71 free(path); 72 if (log_file == NULL) 73 return; 74 75 setvbuf(log_file, NULL, _IOLBF, 0); 76 event_set_log_callback(log_event_cb); 77 } 78 79 /* Close logging. */ 80 void 81 log_close(void) 82 { 83 if (log_file != NULL) 84 fclose(log_file); 85 log_file = NULL; 86 87 event_set_log_callback(NULL); 88 } 89 90 /* Write a log message. */ 91 static void 92 log_vwrite(const char *msg, va_list ap) 93 { 94 char *fmt, *out; 95 struct timeval tv; 96 97 if (log_file == NULL) 98 return; 99 100 if (vasprintf(&fmt, msg, ap) == -1) 101 exit(1); 102 if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) 103 exit(1); 104 105 gettimeofday(&tv, NULL); 106 if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec, 107 (int)tv.tv_usec, out) == -1) 108 exit(1); 109 fflush(log_file); 110 111 free(out); 112 free(fmt); 113 } 114 115 /* Log a debug message. */ 116 void 117 log_debug(const char *msg, ...) 118 { 119 va_list ap; 120 121 va_start(ap, msg); 122 log_vwrite(msg, ap); 123 va_end(ap); 124 } 125 126 /* Log a critical error with error string and die. */ 127 __dead void 128 fatal(const char *msg, ...) 129 { 130 char *fmt; 131 va_list ap; 132 133 va_start(ap, msg); 134 if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1) 135 exit(1); 136 log_vwrite(fmt, ap); 137 exit(1); 138 } 139 140 /* Log a critical error and die. */ 141 __dead void 142 fatalx(const char *msg, ...) 143 { 144 char *fmt; 145 va_list ap; 146 147 va_start(ap, msg); 148 if (asprintf(&fmt, "fatal: %s", msg) == -1) 149 exit(1); 150 log_vwrite(fmt, ap); 151 exit(1); 152 } 153