include/vlc_messages.h

   1 /*****************************************************************************
   2  * vlc_messages.h: messages interface
   3  * This library provides basic functions for threads to interact with user
   4  * interface, such as message output.
   5  *****************************************************************************
   6  * Copyright (C) 1999, 2000, 2001, 2002 VLC authors and VideoLAN
   7  * $Id$
   8  *
   9  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  10  *          Samuel Hocevar <sam@zoy.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU Lesser General Public License as published by
  14  * the Free Software Foundation; either version 2.1 of the License, or
  15  * (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 License
  23  * along with this program; if not, write to the Free Software Foundation,
  24  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 #ifndef VLC_MESSAGES_H_
  28 #define VLC_MESSAGES_H_
  29
  30 #include <stdarg.h>
  31
  32 /**
  33  * \defgroup messages Logging
  34  * \brief Message logs
  35  *
  36  * Functions for modules to emit log messages.
  37  *
  38  * @{
  39  * \file
  40  * Logging functions
  41  */
  42
  43 /** Message types */
  44 enum vlc_log_type
  45 {
  46     VLC_MSG_INFO=0, /**< Important information */
  47     VLC_MSG_ERR,    /**< Error */
  48     VLC_MSG_WARN,   /**< Warning */
  49     VLC_MSG_DBG,    /**< Debug */
  50 };
  51
  52 /**
  53  * Log message
  54  */
  55 typedef struct vlc_log_t
  56 {
  57     uintptr_t   i_object_id; /**< Emitter (temporaly) unique object ID or 0 */
  58     const char *psz_object_type; /**< Emitter object type name */
  59     const char *psz_module; /**< Emitter module (source code) */
  60     const char *psz_header; /**< Additional header (used by VLM media) */
  61     const char *file; /**< Source code file name or NULL */
  62     int line; /**< Source code file line number or -1 */
  63     const char *func; /**< Source code calling function name or NULL */
  64 } vlc_log_t;
  65
  66 VLC_API void vlc_Log(vlc_object_t *obj, int prio, const char *module,
  67                      const char *file, unsigned line, const char *func,
  68                      const char *format, ...) VLC_FORMAT(7, 8);
  69 VLC_API void vlc_vaLog(vlc_object_t *obj, int prio, const char *module,
  70                        const char *file, unsigned line, const char *func,
  71                        const char *format, va_list ap);
  72 #define msg_GenericVa(o, p, fmt, ap) \
  73     vlc_vaLog(VLC_OBJECT(o), p, MODULE_STRING, __FILE__, __LINE__, __func__, \
  74               fmt, ap)
  75
  76 #define msg_Generic(o, p, ...) \
  77     vlc_Log(VLC_OBJECT(o), p, MODULE_STRING, __FILE__, __LINE__, \
  78             __func__, __VA_ARGS__)
  79 #define msg_Info(p_this, ...) \
  80     msg_Generic(p_this, VLC_MSG_INFO, __VA_ARGS__)
  81 #define msg_Err(p_this, ...) \
  82     msg_Generic(p_this, VLC_MSG_ERR, __VA_ARGS__)
  83 #define msg_Warn(p_this, ...) \
  84     msg_Generic(p_this, VLC_MSG_WARN, __VA_ARGS__)
  85 #define msg_Dbg(p_this, ...) \
  86     msg_Generic(p_this, VLC_MSG_DBG, __VA_ARGS__)
  87
  88 #ifndef MODULE_STRING
  89 # define MODULE_STRING __FILE__
  90 #endif
  91
  92 VLC_API const char *vlc_strerror(int);
  93 VLC_API const char *vlc_strerror_c(int);
  94
  95 /**
  96  * Message logging callback signature.
  97  * \param data data pointer as provided to vlc_msg_SetCallback().
  98  * \param type message type (VLC_MSG_* values from enum vlc_log_type)
  99  * \param item meta information
 100  * \param fmt format string
 101  * \param args format string arguments
 102  */
 103 typedef void (*vlc_log_cb) (void *data, int type, const vlc_log_t *item,
 104                             const char *fmt, va_list args);
 105
 106 /**
 107  * @}
 108  */
 109 #endif