[lttng-tools.git] / src / common / error.h

/*
 * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _ERROR_H
#define _ERROR_H

#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <urcu/tls-compat.h>
#include <time.h>

#ifndef _GNU_SOURCE
#error "lttng-tools error.h needs _GNU_SOURCE"
#endif

#include <lttng/lttng-error.h>
#include <common/compat/tid.h>

/* Stringify the expansion of a define */
#define XSTR(d) STR(d)
#define STR(s) #s

/*
 * Contains the string of the log entry time. This is used as a thread local
 * storage so we don't race between thread and also avoid memory allocation
 * every time a log is fired.
 */
struct log_time {
	/* Format: 00:00:00.000000 plus NULL byte. */
	char str[16];
};
extern DECLARE_URCU_TLS(struct log_time, error_log_time);

extern int lttng_opt_quiet;
extern int lttng_opt_verbose;
extern int lttng_opt_mi;

/* Error type. */
enum lttng_error_level {
	PRINT_ERR =	0,
	PRINT_BUG =	1,
	PRINT_WARN =	2,
	PRINT_MSG =	3,
	PRINT_DBG =	4,
	PRINT_DBG2 =	5,
	PRINT_DBG3 =	6,
};

static inline bool __lttng_print_check_opt(enum lttng_error_level type)
{
	/* lttng_opt_mi and lttng_opt_quiet. */
	switch (type) {
	case PRINT_DBG3:
	case PRINT_DBG2:
	case PRINT_DBG:
	case PRINT_MSG:
		if (lttng_opt_mi) {
			return false;
		}
		/* Fall-through. */
	case PRINT_WARN:
	case PRINT_BUG:
	case PRINT_ERR:
		if (lttng_opt_quiet) {
			return false;
		}
	}

	/* lttng_opt_verbose */
	switch (type) {
	case PRINT_DBG3:
		if (lttng_opt_verbose < 3) {
			return false;
		}
		break;
	case PRINT_DBG2:
		if (lttng_opt_verbose < 2) {
			return false;
		}
		break;
	case PRINT_DBG:
		if (lttng_opt_verbose < 1) {
			return false;
		}
		break;
	case PRINT_MSG:
	case PRINT_WARN:
	case PRINT_BUG:
	case PRINT_ERR:
		break;
	}

	return true;
}

/*
 * Macro for printing message depending on command line option and verbosity.
 *
 * Machine interface:
 * We use lttng_opt_mi to suppress all normal msg to stdout. We don't
 * want any nested msg to show up when printing mi to stdout(if it's the case).
 * All warnings and errors should be printed to stderr as normal.
 */
#define __lttng_print(type, fmt, args...)						\
	do {										\
		if (__lttng_print_check_opt(type)) {					\
			fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ## args);	\
		}									\
	} while (0)

/* Three level of debug. Use -v, -vv or -vvv for the levels */
#define _ERRMSG(msg, type, fmt, args...) __lttng_print(type, msg \
		" - %s [%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
			log_add_time(), (long) getpid(), (long) gettid(), ## args, __func__)

#define MSG(fmt, args...) \
	__lttng_print(PRINT_MSG, fmt "\n", ## args)
#define _MSG(fmt, args...) \
	__lttng_print(PRINT_MSG, fmt, ## args)
#define ERR(fmt, args...) \
	__lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
#define WARN(fmt, args...) \
	__lttng_print(PRINT_WARN, "Warning: " fmt "\n", ## args)

#define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ## args)

#define DBG(fmt, args...) _ERRMSG("DEBUG1", PRINT_DBG, fmt, ## args)
#define DBG2(fmt, args...) _ERRMSG("DEBUG2", PRINT_DBG2, fmt, ## args)
#define DBG3(fmt, args...) _ERRMSG("DEBUG3", PRINT_DBG3, fmt, ## args)

#define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)

#if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))

/*
 * Version using XSI strerror_r.
 */
#define PERROR(call, args...) \
	do { \
		char buf[200]; \
		strerror_r(errno, buf, sizeof(buf)); \
		_PERROR(call ": %s", ## args, buf); \
	} while(0);
#else
/*
 * Version using GNU strerror_r, for linux with appropriate defines.
 */
#define PERROR(call, args...) \
	do { \
		char *buf; \
		char tmp[200]; \
		buf = strerror_r(errno, tmp, sizeof(tmp)); \
		_PERROR(call ": %s", ## args, buf); \
	} while(0);
#endif

const char *error_get_str(int32_t code);

/*
 * Function that format the time and return the reference of log_time.str to
 * the caller. On error, an empty string is returned thus no time will be
 * printed in the log.
 */
const char *log_add_time();

#endif /* _ERROR_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	#ifndef _ERROR_H
	19	#define _ERROR_H
	20
	21	#include <errno.h>
	22	#include <stdio.h>
	23	#include <stdint.h>
	24	#include <string.h>
	25	#include <stdbool.h>
	26	#include <urcu/tls-compat.h>
	27	#include <time.h>
	28
	29	#ifndef _GNU_SOURCE
	30	#error "lttng-tools error.h needs _GNU_SOURCE"
	31	#endif
	32
	33	#include <lttng/lttng-error.h>
	34	#include <common/compat/tid.h>
	35
	36	/* Stringify the expansion of a define */
	37	#define XSTR(d) STR(d)
	38	#define STR(s) #s
	39
	40	/*
	41	* Contains the string of the log entry time. This is used as a thread local
	42	* storage so we don't race between thread and also avoid memory allocation
	43	* every time a log is fired.
	44	*/
	45	struct log_time {
	46	/* Format: 00:00:00.000000 plus NULL byte. */
	47	char str[16];
	48	};
	49	extern DECLARE_URCU_TLS(struct log_time, error_log_time);
	50
	51	extern int lttng_opt_quiet;
	52	extern int lttng_opt_verbose;
	53	extern int lttng_opt_mi;
	54
	55	/* Error type. */
	56	enum lttng_error_level {
	57	PRINT_ERR = 0,
	58	PRINT_BUG = 1,
	59	PRINT_WARN = 2,
	60	PRINT_MSG = 3,
	61	PRINT_DBG = 4,
	62	PRINT_DBG2 = 5,
	63	PRINT_DBG3 = 6,
	64	};
	65
	66	static inline bool __lttng_print_check_opt(enum lttng_error_level type)
	67	{
	68	/* lttng_opt_mi and lttng_opt_quiet. */
	69	switch (type) {
	70	case PRINT_DBG3:
	71	case PRINT_DBG2:
	72	case PRINT_DBG:
	73	case PRINT_MSG:
	74	if (lttng_opt_mi) {
	75	return false;
	76	}
	77	/* Fall-through. */
	78	case PRINT_WARN:
	79	case PRINT_BUG:
	80	case PRINT_ERR:
	81	if (lttng_opt_quiet) {
	82	return false;
	83	}
	84	}
	85
	86	/* lttng_opt_verbose */
	87	switch (type) {
	88	case PRINT_DBG3:
	89	if (lttng_opt_verbose < 3) {
	90	return false;
	91	}
	92	break;
	93	case PRINT_DBG2:
	94	if (lttng_opt_verbose < 2) {
	95	return false;
	96	}
	97	break;
	98	case PRINT_DBG:
	99	if (lttng_opt_verbose < 1) {
	100	return false;
	101	}
	102	break;
	103	case PRINT_MSG:
	104	case PRINT_WARN:
	105	case PRINT_BUG:
	106	case PRINT_ERR:
	107	break;
	108	}
	109
	110	return true;
	111	}
	112
	113	/*
	114	* Macro for printing message depending on command line option and verbosity.
	115	*
	116	* Machine interface:
	117	* We use lttng_opt_mi to suppress all normal msg to stdout. We don't
	118	* want any nested msg to show up when printing mi to stdout(if it's the case).
	119	* All warnings and errors should be printed to stderr as normal.
	120	*/
	121	#define __lttng_print(type, fmt, args...) \
	122	do { \
	123	if (__lttng_print_check_opt(type)) { \
	124	fprintf((type) == PRINT_MSG ? stdout : stderr, fmt, ## args); \
	125	} \
	126	} while (0)
	127
	128	/* Three level of debug. Use -v, -vv or -vvv for the levels */
	129	#define _ERRMSG(msg, type, fmt, args...) __lttng_print(type, msg \
	130	" - %s [%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", \
	131	log_add_time(), (long) getpid(), (long) gettid(), ## args, __func__)
	132
	133	#define MSG(fmt, args...) \
	134	__lttng_print(PRINT_MSG, fmt "\n", ## args)
	135	#define _MSG(fmt, args...) \
	136	__lttng_print(PRINT_MSG, fmt, ## args)
	137	#define ERR(fmt, args...) \
	138	__lttng_print(PRINT_ERR, "Error: " fmt "\n", ## args)
	139	#define WARN(fmt, args...) \
	140	__lttng_print(PRINT_WARN, "Warning: " fmt "\n", ## args)
	141
	142	#define BUG(fmt, args...) _ERRMSG("BUG", PRINT_BUG, fmt, ## args)
	143
	144	#define DBG(fmt, args...) _ERRMSG("DEBUG1", PRINT_DBG, fmt, ## args)
	145	#define DBG2(fmt, args...) _ERRMSG("DEBUG2", PRINT_DBG2, fmt, ## args)
	146	#define DBG3(fmt, args...) _ERRMSG("DEBUG3", PRINT_DBG3, fmt, ## args)
	147
	148	#define _PERROR(fmt, args...) _ERRMSG("PERROR", PRINT_ERR, fmt, ## args)
	149
	150	#if !defined(__linux__) \|\| ((_POSIX_C_SOURCE >= 200112L \|\| _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
	151
	152	/*
	153	* Version using XSI strerror_r.
	154	*/
	155	#define PERROR(call, args...) \
	156	do { \
	157	char buf[200]; \
	158	strerror_r(errno, buf, sizeof(buf)); \
	159	_PERROR(call ": %s", ## args, buf); \
	160	} while(0);
	161	#else
	162	/*
	163	* Version using GNU strerror_r, for linux with appropriate defines.
	164	*/
	165	#define PERROR(call, args...) \
	166	do { \
	167	char *buf; \
	168	char tmp[200]; \
	169	buf = strerror_r(errno, tmp, sizeof(tmp)); \
	170	_PERROR(call ": %s", ## args, buf); \
	171	} while(0);
	172	#endif
	173
	174	const char *error_get_str(int32_t code);
	175
	176	/*
	177	* Function that format the time and return the reference of log_time.str to
	178	* the caller. On error, an empty string is returned thus no time will be
	179	* printed in the log.
	180	*/
	181	const char *log_add_time();
	182
	183	#endif /* _ERROR_H */