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/*
* iSCSI Safe Logging and Tracing Library
*
* Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
* maintained by open-iscsi@googlegroups.com
*
* circular buffer code based on log.c from dm-multipath project
*
* heavily based on code from log.c:
* Copyright (C) 2002-2003 Ardis Technolgies <roman@ardistech.com>,
* licensed under the terms of the GNU GPL v2.0,
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* See the file COPYING included with this distribution for more details.
*/
#ifndef LOG_H
#define LOG_H
#include <sys/sem.h>
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
union semun {
int val;
struct semid_ds *buf;
unsigned short int *array;
struct seminfo *__buf;
};
#define LOG_SPACE_SIZE 16384
#define MAX_MSG_SIZE 256
extern int log_daemon;
extern int log_level;
struct logmsg {
short int prio;
void *next;
char *str;
};
struct logarea {
int empty;
int active;
void *head;
void *tail;
void *start;
void *end;
char *buff;
int semid;
union semun semarg;
};
extern int log_init(char *progname, int size, int daemon, int debug);
extern void log_close(void);
extern void dump_logmsg(void *);
extern void log_warning(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
extern void log_error(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
extern void log_debug(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
#ifdef NO_LOGGING
#define eprintf(fmt, args...) \
do { \
fprintf(stderr, "%s: " fmt, program_name, ##args); \
} while (0)
#define dprintf(fmt, args...) \
do { \
if (debug) \
fprintf(stderr, "%s %d: " fmt, \
__FUNCTION__, __LINE__, ##args); \
} while (0)
#else
#define eprintf(fmt, args...) \
do { \
log_error("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
} while (0)
#define dprintf(fmt, args...) \
do { \
if (unlikely(is_debug)) \
log_debug("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
} while (0)
#endif
#endif /* LOG_H */
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