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[vlc.git] / lib / error.c
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1 /*****************************************************************************
2 * error.c: Error handling for libvlc
3 *****************************************************************************
4 * Copyright (C) 2009 RĂ©mi Denis-Courmont
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; either version 2.1 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
19 *****************************************************************************/
21 #include "libvlc_internal.h"
23 #include <stdarg.h>
24 #include <stdio.h>
25 #include <assert.h>
26 #include <vlc/libvlc.h>
29 static const char oom[] = "Out of memory";
30 /* TODO: use only one thread-specific key for whole libvlc */
31 static vlc_threadvar_t context;
33 static char *get_error (void)
35 return vlc_threadvar_get (context);
38 static void free_msg (void *msg)
40 if (msg != oom)
41 free (msg);
44 static void free_error (void)
46 free_msg (get_error ());
49 static vlc_mutex_t lock = VLC_STATIC_MUTEX;
50 static uintptr_t refs = 0;
52 void libvlc_threads_init (void)
54 vlc_mutex_lock (&lock);
55 if (refs++ == 0)
56 vlc_threadvar_create (&context, free_msg);
57 vlc_mutex_unlock (&lock);
60 void libvlc_threads_deinit (void)
62 vlc_mutex_lock (&lock);
63 assert (refs > 0);
64 if (--refs == 0)
66 free_error ();
67 vlc_threadvar_delete (&context);
69 vlc_mutex_unlock (&lock);
72 /**
73 * Gets a human-readable error message for the last LibVLC error in the calling
74 * thread. The resulting string is valid until another error occurs (at least
75 * until the next LibVLC call).
77 * @return NULL if there was no error, a nul-terminated string otherwise.
79 const char *libvlc_errmsg (void)
81 return get_error ();
84 /**
85 * Clears the LibVLC error status for the current thread. This is optional.
86 * By default, the error status is automatically overridden when a new error
87 * occurs, and destroyed when the thread exits.
89 void libvlc_clearerr (void)
91 free_error ();
92 vlc_threadvar_set (context, NULL);
95 /**
96 * Sets the LibVLC error status and message for the current thread.
97 * Any previous error is overridden.
98 * @return a nul terminated string (always)
100 const char *libvlc_vprinterr (const char *fmt, va_list ap)
102 char *msg;
104 assert (fmt != NULL);
105 if (vasprintf (&msg, fmt, ap) == -1)
106 msg = (char *)oom;
108 free_error ();
109 vlc_threadvar_set (context, msg);
110 return msg;
114 * Sets the LibVLC error status and message for the current thread.
115 * Any previous error is overridden.
116 * @return a nul terminated string (always)
118 const char *libvlc_printerr (const char *fmt, ...)
120 va_list ap;
121 const char *msg;
123 va_start (ap, fmt);
124 msg = libvlc_vprinterr (fmt, ap);
125 va_end (ap);
126 return msg;