mirror of https://code.videolan.org/videolan/vlc
132 lines
3.4 KiB
C
132 lines
3.4 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 void libvlc_setup_threads (bool init)
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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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vlc_mutex_lock (&lock);
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if (init)
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{
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if (refs++ == 0)
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vlc_threadvar_create (&context, free);
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}
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else
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{
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assert (refs > 0);
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if (--refs == 0)
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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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void libvlc_init_threads (void)
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{
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libvlc_setup_threads (true);
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}
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void libvlc_deinit_threads (void)
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{
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libvlc_setup_threads (false);
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}
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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_error (void)
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{
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char *msg = get_error ();
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if (msg != oom)
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free (msg);
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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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vlc_threadvar_set (context, NULL);
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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_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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vlc_threadvar_set (context, msg);
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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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