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/*****************************************************************************
* error.c: Error handling for libvlc
*****************************************************************************
* Copyright (C) 2009 Rémi Denis-Courmont
*
* This program 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 program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include "libvlc_internal.h"
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <vlc/libvlc.h>
static const char oom[] = "Out of memory";
/* TODO: use only one thread-specific key for whole libvlc */
static vlc_threadvar_t context;
static char *get_error (void)
{
return vlc_threadvar_get (context);
}
static void free_msg (void *msg)
{
if (msg != oom)
free (msg);
}
static void free_error (void)
{
free_msg (get_error ());
}
static vlc_mutex_t lock = VLC_STATIC_MUTEX;
static uintptr_t refs = 0;
void libvlc_threads_init (void)
{
vlc_mutex_lock (&lock);
if (refs++ == 0)
vlc_threadvar_create (&context, free_msg);
vlc_mutex_unlock (&lock);
}
void libvlc_threads_deinit (void)
{
vlc_mutex_lock (&lock);
assert (refs > 0);
if (--refs == 0)
{
free_error ();
vlc_threadvar_delete (&context);
}
vlc_mutex_unlock (&lock);
}
/**
* Gets a human-readable error message for the last LibVLC error in the calling
* thread. The resulting string is valid until another error occurs (at least
* until the next LibVLC call).
*
* @return NULL if there was no error, a nul-terminated string otherwise.
*/
const char *libvlc_errmsg (void)
{
return get_error ();
}
/**
* Clears the LibVLC error status for the current thread. This is optional.
* By default, the error status is automatically overridden when a new error
* occurs, and destroyed when the thread exits.
*/
void libvlc_clearerr (void)
{
free_error ();
vlc_threadvar_set (context, NULL);
}
/**
* Sets the LibVLC error status and message for the current thread.
* Any previous error is overridden.
* @return a nul terminated string (always)
*/
const char *libvlc_vprinterr (const char *fmt, va_list ap)
{
char *msg;
assert (fmt != NULL);
if (vasprintf (&msg, fmt, ap) == -1)
msg = (char *)oom;
free_error ();
vlc_threadvar_set (context, msg);
return msg;
}
/**
* Sets the LibVLC error status and message for the current thread.
* Any previous error is overridden.
* @return a nul terminated string (always)
*/
const char *libvlc_printerr (const char *fmt, ...)
{
va_list ap;
const char *msg;
va_start (ap, fmt);
msg = libvlc_vprinterr (fmt, ap);
va_end (ap);
return msg;
}
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