rohc_traces.h

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/*
 * Copyright 2012,2013 Didier Barvaux
 * Copyright 2009,2010 Thales Communications
 * Copyright 2012,2013 Viveris Technologies
 *
 * 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 library 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
 */

/**
 * @file   rohc_traces.h
 * @brief  ROHC definitions for traces
 * @author Julien Bernard <julien.bernard@toulouse.viveris.com>
 * @author Audric Schiltknecht <audric.schiltknecht@toulouse.viveris.com>
 * @author Didier Barvaux <didier@barvaux.org>
 */

#ifndef ROHC_TRACES_H
#define ROHC_TRACES_H

#ifdef __cplusplus
extern "C"
{
#endif


/**
 * @brief A general profile number used for traces not related to a specific
 *        profile
 *
 * @ingroup rohc
 */
#define ROHC_PROFILE_GENERAL       0xffff


/**
 * @brief The different levels of the traces
 *
 * Used for the \e level parameter of the \ref rohc_trace_callback2_t
 * user-defined callback.
 *
 * @ingroup rohc
 *
 * @see rohc_trace_callback2_t
 * @see rohc_comp_set_traces_cb2
 * @see rohc_decomp_set_traces_cb2
 */
typedef enum
{
        ROHC_TRACE_DEBUG = 0,   /**< Print debug traces */
        ROHC_TRACE_INFO = 1,    /**< Print info (or lower) traces */
        ROHC_TRACE_WARNING = 2, /**< Print warning (or lower) traces */
        ROHC_TRACE_ERROR = 3,   /**< Print error (or lower) traces */
        ROHC_TRACE_LEVEL_MAX    /**< The maximum number of trace levels */
} rohc_trace_level_t;


/**
 * @brief The different entities concerned by the traces
 *
 * Used for the source \e entity parameter of the \ref rohc_trace_callback2_t
 * user-defined callback.
 *
 * @ingroup rohc
 *
 * @see rohc_trace_callback2_t
 * @see rohc_comp_set_traces_cb2
 * @see rohc_decomp_set_traces_cb2
 */
typedef enum
{
        ROHC_TRACE_COMP = 0,    /**< Compressor traces */
        ROHC_TRACE_DECOMP = 1,  /**< Decompressor traces */
        ROHC_TRACE_ENTITY_MAX   /**< The maximum number of trace entities */
} rohc_trace_entity_t;


/**
 * @brief The function prototype for the trace callback
 *
 * User-defined function that is called by the ROHC library every time it
 * wants to print something, from errors to debug. User may thus decide what
 * traces are interesting (filter on \e level, source \e entity, or
 * \e profile) and what to do with them (print on console, storage in file,
 * syslog...).
 *
 * The user-defined function is set by calling:
 *  \li function \ref rohc_comp_set_traces_cb2 for a ROHC compressor,
 *  \li function \ref rohc_decomp_set_traces_cb2 for a ROHC decompressor.
 *
 * Both functions accept the NULL value to fully disable tracing.
 *
 * @param priv_ctxt  An optional private context, may be NULL
 * @param level      The level of the message, @see rohc_trace_level_t
 * @param entity     The entity concerned by the traces
 *                   @see rohc_trace_entity_t
 * @param profile    The number of the profile concerned by the message
 * @param format     The format string for the trace message
 *
 * @ingroup rohc
 *
 * @see rohc_trace_level_t
 * @see rohc_trace_entity_t
 * @see rohc_comp_set_traces2_cb
 * @see rohc_decomp_set_traces2_cb
 */
typedef void (*rohc_trace_callback2_t) (void *const priv_ctxt,
                                        const rohc_trace_level_t level,
                                        const rohc_trace_entity_t entity,
                                        const int profile,
                                        const char *const format,
                                        ...)
#if defined(__USE_MINGW_ANSI_STDIO) && __USE_MINGW_ANSI_STDIO == 1
        /* MinGW interprets 'printf' format as 'ms_printf', so force
         * usage of 'gnu_printf' */
        __attribute__((format(gnu_printf, 5, 6)));
#else
        /* Use 'printf' format in other cases, because old GCC versions
         * and Clang do not recognize 'gnu_printf' format */
        __attribute__((format(printf, 5, 6)));
#endif


#ifdef __cplusplus
}
#endif

#endif /* ROHC_TRACES_H */