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/* $OpenBSD: log.c,v 1.26 2019/09/24 20:44:58 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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 <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>
#include "tmux.h"
static FILE *log_file;
static int log_level;
static void log_event_cb(int, const char *);
static void log_vwrite(const char *, va_list);
/* 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
log_vwrite(const char *msg, va_list ap)
{
char *fmt, *out;
struct timeval tv;
if (log_file == NULL)
return;
if (vasprintf(&fmt, msg, ap) == -1)
exit(1);
if (stravis(&out, fmt, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL) == -1)
exit(1);
gettimeofday(&tv, NULL);
if (fprintf(log_file, "%lld.%06d %s\n", (long long)tv.tv_sec,
(int)tv.tv_usec, out) == -1)
exit(1);
fflush(log_file);
free(out);
free(fmt);
}
/* 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 *fmt;
va_list ap;
va_start(ap, msg);
if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1)
exit(1);
log_vwrite(fmt, ap);
va_end(ap);
exit(1);
}
/* Log a critical error and die. */
__dead void
fatalx(const char *msg, ...)
{
char *fmt;
va_list ap;
va_start(ap, msg);
if (asprintf(&fmt, "fatal: %s", msg) == -1)
exit(1);
log_vwrite(fmt, ap);
va_end(ap);
exit(1);
}
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