2 * \file <alsa/global.h>
3 * \brief Application interface library for the ALSA driver
4 * \author Jaroslav Kysela <perex@suse.cz>
5 * \author Abramo Bagnara <abramo@alsa-project.org>
6 * \author Takashi Iwai <tiwai@suse.de>
9 * Application interface library for the ALSA driver
12 * This library is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #ifndef __ALSA_GLOBAL_H_
29 #define __ALSA_GLOBAL_H_
32 * \defgroup Global Global defines and functions
33 * Global defines and functions.
37 #ifndef ATTRIBUTE_UNUSED
38 /** do not print warning (gcc) when function parameter is not used */
39 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
42 #ifdef PIC /* dynamic build */
44 /** helper macro for SND_DLSYM_BUILD_VERSION \hideinitializer */
45 #define __SND_DLSYM_VERSION(name, version) _ ## name ## version
46 /** build version for versioned dynamic symbol \hideinitializer */
47 #define SND_DLSYM_BUILD_VERSION(name, version) char __SND_DLSYM_VERSION(name, version);
49 #else /* static build */
51 struct snd_dlsym_link {
52 struct snd_dlsym_link *next;
53 const char *dlsym_name;
54 const void *dlsym_ptr;
57 extern struct snd_dlsym_link *snd_dlsym_start;
59 /** helper macro for SND_DLSYM_BUILD_VERSION \hideinitializer */
60 #define __SND_DLSYM_VERSION(prefix, name, version) _ ## prefix ## name ## version
61 /** build version for versioned dynamic symbol \hideinitializer */
62 #define SND_DLSYM_BUILD_VERSION(name, version) \
63 static struct snd_dlsym_link __SND_DLSYM_VERSION(snd_dlsym_, name, version); \
64 void __SND_DLSYM_VERSION(snd_dlsym_constructor_, name, version) (void) __attribute__ ((constructor)); \
65 void __SND_DLSYM_VERSION(snd_dlsym_constructor_, name, version) (void) { \
66 __SND_DLSYM_VERSION(snd_dlsym_, name, version).next = snd_dlsym_start; \
67 __SND_DLSYM_VERSION(snd_dlsym_, name, version).dlsym_name = # name; \
68 __SND_DLSYM_VERSION(snd_dlsym_, name, version).dlsym_ptr = (void *)&name; \
69 snd_dlsym_start = &__SND_DLSYM_VERSION(snd_dlsym_, name, version); \
74 /** get version of dynamic symbol as string */
75 #define SND_DLSYM_VERSION(version) __STRING(version)
77 void *snd_dlopen(const char *file, int mode);
78 void *snd_dlsym(void *handle, const char *name, const char *version);
79 int snd_dlclose(void *handle);
82 /** Async notification client handler */
83 typedef struct _snd_async_handler snd_async_handler_t;
85 /** Async notification callback */
86 typedef void (*snd_async_callback_t)(snd_async_handler_t *handler);
88 int snd_async_add_handler(snd_async_handler_t **handler, int fd,
89 snd_async_callback_t callback, void *private_data);
90 int snd_async_del_handler(snd_async_handler_t *handler);
91 int snd_async_handler_get_fd(snd_async_handler_t *handler);
92 int snd_async_handler_get_signo(snd_async_handler_t *handler);
93 void *snd_async_handler_get_callback_private(snd_async_handler_t *handler);
97 #endif /* __ALSA_GLOBAL_H */