/* Zebra logging funcions.
 * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#ifndef _ZEBRA_LOG_H
#define _ZEBRA_LOG_H

#include <syslog.h>

#define ZLOG_NOLOG              0x00
#define ZLOG_FILE		0x01
#define ZLOG_SYSLOG		0x02
#define ZLOG_STDOUT             0x04
#define ZLOG_STDERR             0x08

typedef enum 
{
  ZLOG_NONE,
  ZLOG_DEFAULT,
  ZLOG_ZEBRA,
  ZLOG_RIP,
  ZLOG_BGP,
  ZLOG_OSPF,
  ZLOG_RIPNG,  
  ZLOG_OSPF6,
  ZLOG_ISIS,
  ZLOG_MASC
} zlog_proto_t;

struct zlog 
{
  const char *ident;	/* daemon name (first arg to openlog) */
  zlog_proto_t protocol;
  int flags;		/* mask indicating which destinations to log to */
  FILE *fp;
  char *filename;
  int maskpri;		/* discard messages with priority > maskpri */
  int facility;		/* as per syslog facility */
  int record_priority;	/* should messages logged through stdio include the
  			   priority of the message? */
  int syslog_options;	/* 2nd arg to openlog */
};

/* Message structure. */
struct message
{
  int key;
  const char *str;
};

/* Default logging strucutre. */
extern struct zlog *zlog_default;

/* Open zlog function */
struct zlog *openzlog (const char *, int, zlog_proto_t, int, int);

/* Close zlog function. */
void closezlog (struct zlog *zl);

/* GCC have printf type attribute check.  */
#ifdef __GNUC__
#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
#else
#define PRINTF_ATTRIBUTE(a,b)
#endif /* __GNUC__ */

/* Generic function for zlog. */
void zlog (struct zlog *zl, int priority, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);

/* Handy zlog functions. */
void zlog_err (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
void zlog_warn (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
void zlog_info (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
void zlog_notice (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
void zlog_debug (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);

/* For bgpd's peer oriented log. */
void plog_err (struct zlog *, const char *format, ...);
void plog_warn (struct zlog *, const char *format, ...);
void plog_info (struct zlog *, const char *format, ...);
void plog_notice (struct zlog *, const char *format, ...);
void plog_debug (struct zlog *, const char *format, ...);

/* Set zlog flags. */
void zlog_set_flag (struct zlog *zl, int flags);
void zlog_reset_flag (struct zlog *zl, int flags);

/* Set zlog filename. */
int zlog_set_file (struct zlog *zl, const char *filename);
int zlog_reset_file (struct zlog *zl);

/* Rotate log. */
int zlog_rotate (struct zlog *);

/* For hackey massage lookup and check */
#define LOOKUP(x, y) mes_lookup(x, x ## _max, y)

const char *lookup (struct message *, int);
const char *mes_lookup (struct message *meslist, int max, int index);

extern const char *zlog_priority[];

/* Safe version of strerror -- never returns NULL. */
extern const char *safe_strerror(int errnum);

/* To be called when a fatal signal is caught. */
extern void zlog_signal(int signo, const char *action);

/* Log a backtrace. */
extern void zlog_backtrace(int priority);

/* Log a backtrace, but in an async-signal-safe way.  Should not be
   called unless the program is about to exit or abort, since it messes
   up the state of zlog file pointers.  This function needs to be enhanced
   to support syslog logging. */
extern void zlog_backtrace_sigsafe(int priority);

#endif /* _ZEBRA_LOG_H */