1 /** 2 * \file include/error.h 3 * \brief Application interface library for the ALSA driver 4 * \author Jaroslav Kysela <perex (at) perex.cz> 5 * \author Abramo Bagnara <abramo (at) alsa-project.org> 6 * \author Takashi Iwai <tiwai (at) suse.de> 7 * \date 1998-2001 8 * 9 * Application interface library for the ALSA driver 10 */ 11 /* 12 * This library is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU Lesser General Public License as 14 * published by the Free Software Foundation; either version 2.1 of 15 * the License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU Lesser General Public License for more details. 21 * 22 * You should have received a copy of the GNU Lesser General Public 23 * License along with this library; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #ifndef __ALSA_ERROR_H 29 #define __ALSA_ERROR_H 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 /** 36 * \defgroup Error Error handling 37 * Error handling macros and functions. 38 * \{ 39 */ 40 41 #define SND_ERROR_BEGIN 500000 /**< Lower boundary of sound error codes. */ 42 #define SND_ERROR_INCOMPATIBLE_VERSION (SND_ERROR_BEGIN+0) /**< Kernel/library protocols are not compatible. */ 43 #define SND_ERROR_ALISP_NIL (SND_ERROR_BEGIN+1) /**< Lisp encountered an error during acall. */ 44 45 const char *snd_strerror(int errnum); 46 47 /** 48 * \brief Error handler callback. 49 * \param file Source file name. 50 * \param line Line number. 51 * \param function Function name. 52 * \param err Value of \c errno, or 0 if not relevant. 53 * \param fmt \c printf(3) format. 54 * \param ... \c printf(3) arguments. 55 * 56 * A function of this type is called by the ALSA library when an error occurs. 57 * This function usually shows the message on the screen, and/or logs it. 58 */ 59 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))) */; 60 extern snd_lib_error_handler_t snd_lib_error; 61 extern int snd_lib_error_set_handler(snd_lib_error_handler_t handler); 62 63 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 95) 64 #define SNDERR(...) snd_lib_error(__FILE__, __LINE__, __FUNCTION__, 0, __VA_ARGS__) /**< Shows a sound error message. */ 65 #define SYSERR(...) snd_lib_error(__FILE__, __LINE__, __FUNCTION__, errno, __VA_ARGS__) /**< Shows a system error message (related to \c errno). */ 66 #else 67 #define SNDERR(args...) snd_lib_error(__FILE__, __LINE__, __FUNCTION__, 0, ##args) /**< Shows a sound error message. */ 68 #define SYSERR(args...) snd_lib_error(__FILE__, __LINE__, __FUNCTION__, errno, ##args) /**< Shows a system error message (related to \c errno). */ 69 #endif 70 71 /** \} */ 72 73 #ifdef __cplusplus 74 } 75 #endif 76 77 #endif /* __ALSA_ERROR_H */ 78 79
