tmux/log.c

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2007-07-25 23:13:18 +00:00
/* $Id: log.c,v 1.2 2007-07-25 23:13:18 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <syslog.h>
#include "tmux.h"
/* Logging enabled. */
int log_enabled;
/* Log stream or NULL to use syslog. */
FILE *log_stream;
/* Debug level. */
int log_level;
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/* Open logging. */
void
log_open(FILE *f, int facility, int level)
{
log_stream = f;
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if (f != NULL)
setlinebuf(f);
log_level = level;
if (f == NULL)
openlog(__progname, LOG_PID|LOG_NDELAY, facility);
tzset();
log_enabled = 1;
}
/* Close logging. */
void
log_close(void)
{
if (log_stream != NULL)
fclose(log_stream);
log_enabled = 0;
}
/* Write a log message. */
void
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log_write(FILE *f, int priority, const char *msg, ...)
{
va_list ap;
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va_start(ap, msg);
log_vwrite(f, priority, msg, ap);
va_end(ap);
}
/* Write a log message. */
void
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log_vwrite(FILE *f, int priority, const char *msg, va_list ap)
{
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char *fmt;
if (!log_enabled)
return;
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if (f == NULL)
f = log_stream;
if (f == NULL) {
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vsyslog(priority, msg, ap);
return;
}
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if (asprintf(&fmt, "%s\n", msg) == -1)
exit(1);
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if (vfprintf(f, fmt, ap) == -1)
exit(1);
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fflush(f);
free(fmt);
}
/* Log a warning with error string. */
void printflike1
log_warn(const char *msg, ...)
{
va_list ap;
char *fmt;
if (!log_enabled)
return;
va_start(ap, msg);
if (asprintf(&fmt, "%s: %s", msg, strerror(errno)) == -1)
exit(1);
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log_vwrite(NULL, LOG_CRIT, fmt, ap);
free(fmt);
va_end(ap);
}
/* Log a warning. */
void printflike1
log_warnx(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
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log_vwrite(NULL, LOG_CRIT, msg, ap);
va_end(ap);
}
/* Log an informational message. */
void printflike1
log_info(const char *msg, ...)
{
va_list ap;
if (log_level > -1) {
va_start(ap, msg);
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if (log_stream == stderr) /* XXX */
log_vwrite(stdout, LOG_INFO, msg, ap);
else
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log_vwrite(NULL, LOG_INFO, msg, ap);
va_end(ap);
}
}
/* Log a debug message. */
void printflike1
log_debug(const char *msg, ...)
{
va_list ap;
if (log_level > 0) {
va_start(ap, msg);
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log_vwrite(NULL, LOG_DEBUG, msg, ap);
va_end(ap);
}
}
/* Log a debug message at level 2. */
void printflike1
log_debug2(const char *msg, ...)
{
va_list ap;
if (log_level > 1) {
va_start(ap, msg);
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log_vwrite(NULL, LOG_DEBUG, msg, ap);
va_end(ap);
}
}
/* Log a debug message at level 3. */
void printflike1
log_debug3(const char *msg, ...)
{
va_list ap;
if (log_level > 2) {
va_start(ap, msg);
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log_vwrite(NULL, LOG_DEBUG, msg, ap);
va_end(ap);
}
}
/* Log a critical error, with error string if necessary, and die. */
__dead void
log_vfatal(const char *msg, va_list ap)
{
char *fmt;
if (!log_enabled)
exit(1);
if (errno != 0) {
if (asprintf(&fmt, "fatal: %s: %s", msg, strerror(errno)) == -1)
exit(1);
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log_vwrite(NULL, LOG_CRIT, fmt, ap);
} else {
if (asprintf(&fmt, "fatal: %s", msg) == -1)
exit(1);
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log_vwrite(NULL, LOG_CRIT, fmt, ap);
}
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free(fmt);
exit(1);
}
/* Log a critical error, with error string, and die. */
__dead void
log_fatal(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
log_vfatal(msg, ap);
}
/* Log a critical error and die. */
__dead void
log_fatalx(const char *msg, ...)
{
va_list ap;
errno = 0;
va_start(ap, msg);
log_vfatal(msg, ap);
}