/*

 * Copyright (c) 2015, 2016 Nicira, Inc.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "syslog-libc.h"

#include <config.h>

#include <string.h>

#include <syslog.h>

#include <unistd.h>

#include "compiler.h"

#include "openvswitch/dynamic-string.h"

#include "socket-util.h"

#include "syslog-provider.h"

#include "util.h"

static void syslog_libc_open(struct syslogger *this, int facility);

static void syslog_libc_log(struct syslogger *this, int pri, const char *msg);

static struct syslog_class syslog_libc_class = {

    syslog_libc_open,

    syslog_libc_log,

};

struct syslog_libc {

    struct syslogger parent;

};

/* This function  creates object that delegate all logging to libc's

 * syslog implementation. */

struct syslogger *

syslog_libc_create(void)

{

    struct syslog_libc *this = xmalloc(sizeof *this);

    this->parent.class = &syslog_libc_class;

    this->parent.prefix = "<%B> %D{%h %e %T} %E %A:";

    return &this->parent;

}

static void

syslog_libc_open(struct syslogger *this OVS_UNUSED, int facility)

{

    static char *ident;

    /* openlog() is allowed to keep the pointer passed in, without making a

     * copy.  The daemonize code sometimes frees and replaces

     * 'program_name', so make a private copy just for openlog().  (We keep

     * a pointer to the private copy to suppress memory leak warnings in

     * case openlog() does make its own copy.) */

    ident = nullable_xstrdup(program_name);

    openlog(ident, LOG_NDELAY, facility);

}

static void

syslog_libc_log(struct syslogger *this OVS_UNUSED, int pri, const char *msg)

{

    syslog(pri, "%s", msg);

}