/* $OpenBSD: log.c,v 1.30 2021/09/10 15:03:18 nicm Exp $ */ /* * Copyright (c) 2007 Nicholas Marriott * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include "tmux.h" static FILE *log_file; static int log_level; /* Log callback for libevent. */ static void log_event_cb(__unused int severity, const char *msg) { log_debug("%s", msg); } /* Increment log level. */ void log_add_level(void) { log_level++; } /* Get log level. */ int log_get_level(void) { return (log_level); } /* Open logging to file. */ void log_open(const char *name) { char *path; if (log_level == 0) return; log_close(); xasprintf(&path, "tmux-%s-%ld.log", name, (long)getpid()); log_file = fopen(path, "a"); free(path); if (log_file == NULL) return; setvbuf(log_file, NULL, _IOLBF, 0); event_set_log_callback(log_event_cb); } /* Toggle logging. */ void log_toggle(const char *name) { if (log_level == 0) { log_level = 1; log_open(name); log_debug("log opened"); } else { log_debug("log closed"); log_level = 0; log_close(); } } /* Close logging. */ void log_close(void) { if (log_file != NULL) fclose(log_file); log_file = NULL; event_set_log_callback(NULL); } /* Write a log message. */ static void printflike(1, 0) log_vwrite(const char *msg, va_list ap, const char *prefix) { char *s, *out; struct timeval tv; if (log_file == NULL) return; if (vasprintf(&s, msg, ap) == -1) return; if (stravis(&out, s, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1) { free(s); return; } free(s); gettimeofday(&tv, NULL); if (fprintf(log_file, "%lld.%06d %s%s\n", (long long)tv.tv_sec, (int)tv.tv_usec, prefix, out) != -1) fflush(log_file); free(out); } /* Log a debug message. */ void log_debug(const char *msg, ...) { va_list ap; if (log_file == NULL) return; va_start(ap, msg); log_vwrite(msg, ap, ""); va_end(ap); } /* Log a critical error with error string and die. */ __dead void fatal(const char *msg, ...) { char tmp[256]; va_list ap; if (snprintf(tmp, sizeof tmp, "fatal: %s: ", strerror(errno)) < 0) exit (1); va_start(ap, msg); log_vwrite(msg, ap, tmp); va_end(ap); exit(1); } /* Log a critical error and die. */ __dead void fatalx(const char *msg, ...) { va_list ap; va_start(ap, msg); log_vwrite(msg, ap, "fatal: "); va_end(ap); exit(1); }