alsa-lib/include/local.h

/*
 *  ALSA lib - local header file
 *  Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   This library 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 library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef __LOCAL_H
#define __LOCAL_H

#include "config.h"

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#elif defined(HAVE_SYS_ENDIAN_H)
#include <sys/endian.h>
#ifndef __BYTE_ORDER
#define __BYTE_ORDER BYTE_ORDER
#endif
#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#endif
#ifndef __BIG_ENDIAN
#define __BIG_ENDIAN BIG_ENDIAN
#endif
#else
#error Header defining endianness not defined
#endif
#include <stdarg.h>
#include <poll.h>
#include <sys/types.h>
#include <errno.h>
#if defined(__linux__)
#include <linux/types.h>
#include <linux/ioctl.h>
#else
#include "type_compat.h"
#endif

#ifdef SUPPORT_RESMGR
#include <resmgr.h>
#endif
#ifdef HAVE_LIBDL
#include <dlfcn.h>
#else
#define RTLD_NOW	0
#endif

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define SND_LITTLE_ENDIAN
#define SNDRV_LITTLE_ENDIAN
#elif __BYTE_ORDER == __BIG_ENDIAN
#define SND_BIG_ENDIAN
#define SNDRV_BIG_ENDIAN
#else
#error "Unsupported endian..."
#endif

#define _snd_config_iterator list_head
#define _snd_interval snd_interval
#define _snd_pcm_info snd_pcm_info
#define _snd_pcm_hw_params snd_pcm_hw_params
#define _snd_pcm_sw_params snd_pcm_sw_params
#define _snd_pcm_status snd_pcm_status

#define _snd_ctl_card_info snd_ctl_card_info
#define _snd_ctl_elem_id snd_ctl_elem_id
#define _snd_ctl_elem_list snd_ctl_elem_list
#define _snd_ctl_elem_info snd_ctl_elem_info
#define _snd_ctl_elem_value snd_ctl_elem_value
#define _snd_ctl_event snd_ctl_event

#define _snd_rawmidi_info snd_rawmidi_info
#define _snd_rawmidi_params snd_rawmidi_params
#define _snd_rawmidi_status snd_rawmidi_status

#define _snd_hwdep_info snd_hwdep_info
#define _snd_hwdep_dsp_status snd_hwdep_dsp_status
#define _snd_hwdep_dsp_image snd_hwdep_dsp_image

#define _snd_seq_queue_tempo snd_seq_queue_tempo
#define _snd_seq_client_info snd_seq_client_info
#define _snd_seq_port_info snd_seq_port_info
#define _snd_seq_system_info snd_seq_system_info
#define _snd_seq_queue_info snd_seq_queue_info
#define _snd_seq_queue_status snd_seq_queue_status
#define _snd_seq_queue_timer snd_seq_queue_timer
#define _snd_seq_port_subscribe snd_seq_port_subscribe
#define _snd_seq_query_subscribe snd_seq_query_subs
#define _snd_seq_client_pool snd_seq_client_pool
#define _snd_seq_remove_events snd_seq_remove_events

#define _snd_timer_id snd_timer_id
#define _snd_timer_ginfo snd_timer_ginfo
#define _snd_timer_gparams snd_timer_gparams
#define _snd_timer_gstatus snd_timer_gstatus
#define _snd_timer_select snd_timer_select
#define _snd_timer_info snd_timer_info
#define _snd_timer_params snd_timer_params
#define _snd_timer_status snd_timer_status

#define ALSA_LIBRARY_BUILD

/* rename some types for avoiding conflicts with alsalib's definitions */
#define snd_aes_iec958		sndrv_aes_iec958
#define snd_pcm_uframes_t	sndrv_pcm_uframes_t
#define snd_pcm_sframes_t	sndrv_pcm_sframes_t
#define snd_pcm_access_t	sndrv_pcm_access_t
#define snd_pcm_format_t	sndrv_pcm_format_t
#define snd_pcm_subformat_t	sndrv_pcm_subformat_t
#define snd_pcm_state_t		sndrv_pcm_state_t
#define snd_interval		sndrv_interval
#define snd_mask		sndrv_mask
#define snd_ctl_elem_type_t	sndrv_ctl_elem_type_t
#define snd_ctl_elem_iface_t	sndrv_ctl_elem_iface_t
#define snd_ctl_tlv		sndrv_ctl_tlv

/* kill and replace kernel-specific types */
#ifndef __user
#define __user
#endif
#ifndef __force
#define __force
#endif

#include <sound/asound.h>

/* take back superfluous renames; some can be kept as is */
#undef snd_aes_iec958
#undef snd_pcm_uframes_t
#undef snd_pcm_sframes_t
#undef snd_pcm_access_t
#undef snd_pcm_format_t
#undef snd_pcm_subformat_t
#undef snd_pcm_state_t
#undef snd_ctl_elem_type_t
#undef snd_ctl_elem_iface_t

#include "asoundef.h"
#include "alsa-symbols.h"
#include "version.h"
#include "global.h"
#include "input.h"
#include "output.h"
#include "error.h"
#include "conf.h"
#include "pcm.h"
#include "pcm_plugin.h"
#include "rawmidi.h"
#include "timer.h"
#include "hwdep.h"
#include "control.h"
#include "mixer.h"
#include "seq_event.h"
#include "seq.h"

/* rename some types for avoiding conflicts with alsalib's definitions */
#define snd_seq_addr		sndrv_seq_addr
#define snd_seq_tick_time_t	sndrv_seq_tick_time_t
#define snd_seq_real_time	sndrv_seq_real_time
#define snd_seq_timestamp	sndrv_seq_timestamp
#define snd_seq_event_type_t	sndrv_seq_event_type_t
#define snd_seq_event		sndrv_seq_event
#define snd_seq_connect		sndrv_seq_connect
#define snd_seq_ev_note		sndrv_seq_ev_note
#define snd_seq_ev_ctrl		sndrv_seq_ev_ctrl
#define snd_seq_ev_raw8		sndrv_seq_ev_raw8
#define snd_seq_ev_raw32	sndrv_seq_ev_raw32
#define snd_seq_ev_ext		sndrv_seq_ev_ext
#define snd_seq_result		sndrv_seq_result
#define snd_seq_queue_skew	sndrv_seq_queue_skew
#define snd_seq_ev_queue_control	sndrv_seq_ev_queue_control
#define snd_seq_client_t	sndrv_seq_client_t
#define snd_seq_client_type_t	sndrv_seq_client_type_t

#include <sound/asequencer.h>

/* take back some renames */
#undef snd_seq_client_t
#undef snd_seq_client_type_t

#include "seqmid.h"
#include "seq_midi_event.h"
#include "list.h"

struct _snd_async_handler {
	enum {
		SND_ASYNC_HANDLER_GENERIC,
		SND_ASYNC_HANDLER_CTL,
		SND_ASYNC_HANDLER_PCM,
		SND_ASYNC_HANDLER_TIMER,
	} type;
	int fd;
	union {
		snd_ctl_t *ctl;
		snd_pcm_t *pcm;
		snd_timer_t *timer;
	} u;
	snd_async_callback_t callback;
	void *private_data;
	struct list_head glist;
	struct list_head hlist;
};

typedef enum _snd_set_mode {
	SND_CHANGE,
	SND_TRY,
	SND_TEST,
} snd_set_mode_t;

size_t page_align(size_t size);
size_t page_size(void);
size_t page_ptr(size_t object_offset, size_t object_size, size_t *offset, size_t *mmap_offset);

int safe_strtol(const char *str, long *val);

int snd_send_fd(int sock, void *data, size_t len, int fd);
int snd_receive_fd(int sock, void *data, size_t len, int *fd);
size_t snd_strlcpy(char *dst, const char *src, size_t size);

/*
 * error messages
 */
#ifndef NDEBUG
#define CHECK_SANITY(x) x
extern snd_lib_error_handler_t snd_err_msg;
#define SNDMSG(args...) snd_err_msg(__FILE__, __LINE__, __func__, 0, ##args)
#define SYSMSG(args...) snd_err_msg(__FILE__, __LINE__, __func__, errno, ##args)
#else
#define CHECK_SANITY(x) 0 /* not evaluated */
#define SNDMSG(args...) /* nop */
#define SYSMSG(args...) /* nop */
#endif

/*
 */
#define HAVE_GNU_LD
#define HAVE_ELF
#define HAVE_ASM_PREVIOUS_DIRECTIVE

/* Stolen from libc-symbols.h in GNU glibc */

/* When a reference to SYMBOL is encountered, the linker will emit a
   warning message MSG.  */

#define ASM_NAME(name) __SYMBOL_PREFIX name

#ifdef HAVE_GNU_LD
# ifdef HAVE_ELF

/* We want the .gnu.warning.SYMBOL section to be unallocated.  */
#  ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
#   define __make_section_unallocated(section_string)	\
  asm (".section " section_string "\n\t.previous");
#  elif defined HAVE_ASM_POPSECTION_DIRECTIVE
#   define __make_section_unallocated(section_string)	\
  asm (".pushsection " section_string "\n\t.popsection");
#  else
#   define __make_section_unallocated(section_string)
#  endif

/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
   section attributes on what looks like a comment to the assembler.  */
#  ifdef HAVE_SECTION_QUOTES
#   define link_warning(symbol, msg) \
  __make_section_unallocated (".gnu.warning." ASM_NAME(#symbol)) \
  static const char __evoke_link_warning_##symbol[]	\
    __attribute__ ((section (".gnu.warning." ASM_NAME(#symbol) "\"\n\t#\""))) = msg;
#  else
#   define link_warning(symbol, msg) \
  __make_section_unallocated (".gnu.warning." ASM_NAME(#symbol)) \
  static const char __evoke_link_warning_##symbol[]	\
    __attribute__ ((section (".gnu.warning." ASM_NAME(#symbol) "\n\t#"))) = msg;
#  endif
# else
#  define link_warning(symbol, msg)		\
  asm (".stabs \"" msg "\",30,0,0,0\n\t"	\
       ".stabs \"" ASM_NAME(#symbol) "\",1,0,0,0\n");
# endif
#else
/* We will never be heard; they will all die horribly.  */
# define link_warning(symbol, msg)
#endif

static inline int snd_open_device(const char *filename, int fmode)
{
	int fd;

#ifdef O_CLOEXEC
	fmode |= O_CLOEXEC;
#endif
	fd = open(filename, fmode);

/* open with resmgr */
#ifdef SUPPORT_RESMGR
	if (fd < 0) {
		if (errno == EAGAIN || errno == EBUSY)
			return fd;
		if (! access(filename, F_OK))
			fd = rsm_open_device(filename, fmode);
	}
#endif
#ifndef O_CLOEXEC
	if (fd >= 0)
		fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
	return fd;
}

/* make local functions really local */
#define snd_dlobj_cache_get \
	snd1_dlobj_cache_get
#define snd_dlobj_cache_get2 \
	snd1_dlobj_cache_get2
#define snd_dlobj_cache_put \
	snd1_dlobj_cache_put
#define snd_dlobj_cache_cleanup \
	snd1_dlobj_cache_cleanup
#define snd_config_set_hop \
	snd1_config_set_hop
#define snd_config_check_hop \
	snd1_config_check_hop
#define snd_config_search_alias_hooks \
	snd1_config_search_alias_hooks

/* dlobj cache */
void *snd_dlobj_cache_get(const char *lib, const char *name, const char *version, int verbose);
void *snd_dlobj_cache_get2(const char *lib, const char *name, const char *version, int verbose);
int snd_dlobj_cache_put(void *open_func);
void snd_dlobj_cache_cleanup(void);

/* for recursive checks */
void snd_config_set_hop(snd_config_t *conf, int hop);
int snd_config_check_hop(snd_config_t *conf);
#define SND_CONF_MAX_HOPS	64

int snd_config_search_alias_hooks(snd_config_t *config,
                                  const char *base, const char *key,
				  snd_config_t **result);

int _snd_conf_generic_id(const char *id);

int _snd_config_load_with_include(snd_config_t *config, snd_input_t *in,
				  int override, const char * const *default_include_path);

/* convenience macros */
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))

#define container_of(ptr, type, member) ({                      \
	 const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
	(type *)( (char *)__mptr - offsetof(type,member) );})

#ifdef INTERNAL
void *INTERNAL(snd_dlopen)(const char *name, int mode, char *errbuf, size_t errbuflen);
#endif

const char *uc_mgr_alibcfg_by_device(snd_config_t **config, const char *name);

static inline int _snd_is_ucm_device(const char *name)
{
	return name && name[0] == '_' && name[1] == 'u' && name[2] == 'c' && name[3] == 'm';
}

#endif