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https://code.videolan.org/videolan/vlc
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4c73518d6e
There's no reason for an app to mix its error messages with ours. Applications that may have used this will fail to link so will quickly notice the change.
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*****************************************************************************
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* error.c: Error handling for libvlc
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*****************************************************************************
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* Copyright (C) 2009 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include "libvlc_internal.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <assert.h>
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#include <vlc/libvlc.h>
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static const char oom[] = "Out of memory";
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/* TODO: use only one thread-specific key for whole libvlc */
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static vlc_threadvar_t context;
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static char *get_error (void)
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{
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return vlc_threadvar_get (context);
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}
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static void free_msg (void *msg)
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{
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if (msg != oom)
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free (msg);
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}
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static void free_error (void)
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{
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free_msg (get_error ());
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}
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static vlc_mutex_t lock = VLC_STATIC_MUTEX;
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static uintptr_t refs = 0;
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void libvlc_threads_init (void)
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{
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vlc_mutex_lock (&lock);
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if (refs++ == 0)
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vlc_threadvar_create (&context, free_msg);
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vlc_mutex_unlock (&lock);
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}
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void libvlc_threads_deinit (void)
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{
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vlc_mutex_lock (&lock);
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assert (refs > 0);
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if (--refs == 0)
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{
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free_error ();
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vlc_threadvar_delete (&context);
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}
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vlc_mutex_unlock (&lock);
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}
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/**
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* Gets a human-readable error message for the last LibVLC error in the calling
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* thread. The resulting string is valid until another error occurs (at least
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* until the next LibVLC call).
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*
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* @return NULL if there was no error, a nul-terminated string otherwise.
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*/
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const char *libvlc_errmsg (void)
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{
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return get_error ();
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}
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/**
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* Clears the LibVLC error status for the current thread. This is optional.
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* By default, the error status is automatically overridden when a new error
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* occurs, and destroyed when the thread exits.
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*/
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void libvlc_clearerr (void)
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{
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free_error ();
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int ret = vlc_threadvar_set (context, NULL);
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if(unlikely(ret != 0))
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abort();
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}
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/**
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* Sets the LibVLC error status and message for the current thread.
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* Any previous error is overridden.
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* \param fmt the format string
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* \param ap the arguments
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* \return a nul terminated string in any case
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*/
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static const char *libvlc_vprinterr (const char *fmt, va_list ap)
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{
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char *msg;
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assert (fmt != NULL);
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if (vasprintf (&msg, fmt, ap) == -1)
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msg = (char *)oom;
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free_error ();
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int ret = vlc_threadvar_set (context, msg);
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if(unlikely(ret != 0))
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abort();
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return msg;
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}
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/**
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* Sets the LibVLC error status and message for the current thread.
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* Any previous error is overridden.
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* @return a nul terminated string (always)
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*/
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const char *libvlc_printerr (const char *fmt, ...)
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{
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va_list ap;
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const char *msg;
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va_start (ap, fmt);
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msg = libvlc_vprinterr (fmt, ap);
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va_end (ap);
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return msg;
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}
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