alsa-lib/include/error.h

/**
 * \file include/error.h
 * \brief Application interface library for the ALSA driver
 * \author Jaroslav Kysela <perex@perex.cz>
 * \author Abramo Bagnara <abramo@alsa-project.org>
 * \author Takashi Iwai <tiwai@suse.de>
 * \date 1998-2001
 *
 * Application interface library for the ALSA driver
 */
/*
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#if !defined(__ASOUNDLIB_H) && !defined(ALSA_LIBRARY_BUILD)
/* don't use ALSA_LIBRARY_BUILD define in sources outside alsa-lib */
#warning "use #include <alsa/asoundlib.h>, <alsa/error.h> should not be used directly"
#include <alsa/asoundlib.h>
#endif

#ifndef __ALSA_ERROR_H
#define __ALSA_ERROR_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 *  \defgroup Error Error handling
 *  Error handling macros and functions.
 *  \{
 */

#define SND_ERROR_BEGIN				500000			/**< Lower boundary of sound error codes. */
#define SND_ERROR_INCOMPATIBLE_VERSION		(SND_ERROR_BEGIN+0)	/**< Kernel/library protocols are not compatible. */
#define SND_ERROR_ALISP_NIL			(SND_ERROR_BEGIN+1)	/**< Lisp encountered an error during acall. */

const char *snd_strerror(int errnum);

/**
 * \brief Error handler callback.
 * \param file Source file name.
 * \param line Line number.
 * \param function Function name.
 * \param err Value of \c errno, or 0 if not relevant.
 * \param fmt \c printf(3) format.
 * \param ... \c printf(3) arguments.
 *
 * A function of this type is called by the ALSA library when an error occurs.
 * This function usually shows the message on the screen, and/or logs it.
 */
typedef void (*snd_lib_error_handler_t)(const char *file, int line, const char *function, int err, const char *fmt, ...) /* __attribute__ ((format (printf, 5, 6))) */;
extern snd_lib_error_handler_t snd_lib_error;
extern int snd_lib_error_set_handler(snd_lib_error_handler_t handler);

#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 95)
#define SNDERR(...) snd_lib_error(__FILE__, __LINE__, __func__, 0, __VA_ARGS__) /**< Shows a sound error message. */
#define SYSERR(...) snd_lib_error(__FILE__, __LINE__, __func__, errno, __VA_ARGS__) /**< Shows a system error message (related to \c errno). */
#else
#define SNDERR(args...) snd_lib_error(__FILE__, __LINE__, __func__, 0, ##args) /**< Shows a sound error message. */
#define SYSERR(args...) snd_lib_error(__FILE__, __LINE__, __func__, errno, ##args) /**< Shows a system error message (related to \c errno). */
#endif

/** \} */

#ifdef __cplusplus
}
#endif

/** Local error handler function type */
typedef void (*snd_local_error_handler_t)(const char *file, int line,
					  const char *func, int err,
					  const char *fmt, va_list arg);

snd_local_error_handler_t snd_lib_error_set_local(snd_local_error_handler_t func);

#endif /* __ALSA_ERROR_H */