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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license from the top-level
* OPENSOLARIS.LICENSE or <http://opensource.org/licenses/CDDL-1.0>.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each file
* and include the License file from the top-level OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
*/
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "zed_log.h"
#define ZED_LOG_MAX_ID_LEN 64
#define ZED_LOG_MAX_LOG_LEN 1024
static struct {
unsigned do_stderr:1;
unsigned do_syslog:1;
int level;
char id[ZED_LOG_MAX_ID_LEN];
} _ctx;
void
zed_log_init(const char *identity)
{
const char *p;
if (identity) {
p = (p = strrchr(identity, '/')) ? p + 1 : identity;
strlcpy(_ctx.id, p, sizeof (_ctx.id));
} else {
_ctx.id[0] = '\0';
}
}
void
zed_log_fini()
{
if (_ctx.do_syslog) {
closelog();
}
}
void
zed_log_stderr_open(int level)
{
_ctx.do_stderr = 1;
_ctx.level = level;
}
void
zed_log_stderr_close(void)
{
_ctx.do_stderr = 0;
}
void
zed_log_syslog_open(int facility)
{
const char *identity;
_ctx.do_syslog = 1;
identity = (_ctx.id[0] == '\0') ? NULL : _ctx.id;
openlog(identity, LOG_NDELAY, facility);
}
void
zed_log_syslog_close(void)
{
_ctx.do_syslog = 0;
closelog();
}
static void
_zed_log_aux(int priority, const char *fmt, va_list vargs)
{
char buf[ZED_LOG_MAX_LOG_LEN];
char *syslogp;
char *p;
int len;
int n;
assert(fmt != NULL);
syslogp = NULL;
p = buf;
len = sizeof (buf);
if (_ctx.id[0] != '\0') {
n = snprintf(p, len, "%s: ", _ctx.id);
if ((n < 0) || (n >= len)) {
p += len - 1;
len = 0;
} else {
p += n;
len -= n;
}
}
if ((len > 0) && fmt) {
syslogp = p;
n = vsnprintf(p, len, fmt, vargs);
if ((n < 0) || (n >= len)) {
p += len - 1;
len = 0;
} else {
p += n;
len -= n;
}
}
*p = '\0';
if (_ctx.do_syslog && syslogp)
syslog(priority, "%s", syslogp);
if (_ctx.do_stderr && priority <= _ctx.level)
fprintf(stderr, "%s\n", buf);
}
/*
* Log a message at the given [priority] level specified by the printf-style
* format string [fmt].
*/
void
zed_log_msg(int priority, const char *fmt, ...)
{
va_list vargs;
if (fmt) {
va_start(vargs, fmt);
_zed_log_aux(priority, fmt, vargs);
va_end(vargs);
}
}
/*
* Log a fatal error message specified by the printf-style format string [fmt].
*/
void
zed_log_die(const char *fmt, ...)
{
va_list vargs;
if (fmt) {
va_start(vargs, fmt);
_zed_log_aux(LOG_ERR, fmt, vargs);
va_end(vargs);
}
exit(EXIT_FAILURE);
}
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