Added support for async. Added error callback (and begun to use it). First implementation of pcm_share

aserver/aserver.c

@@ -353,6 +353,9 @@ int pcm_shm_cmd(client_t *client)
 	ctrl->cmd = 0;
 	pcm = client->device.pcm.handle;
 	switch (cmd) {
+	case SND_PCM_IOCTL_ASYNC:
+		ctrl->result = snd_pcm_async(pcm, ctrl->u.async.sig, ctrl->u.async.pid);
+		break;
 	case SND_PCM_IOCTL_INFO:
 		ctrl->result = snd_pcm_info(pcm, &ctrl->u.info);
 		break;

include/aserver.h

@@ -26,14 +26,19 @@
 #define SND_PCM_IOCTL_MUNMAP_DATA	_IO ('A', 0xf4)
 #define SND_PCM_IOCTL_MUNMAP_CONTROL	_IO ('A', 0xf5)
 #define SND_PCM_IOCTL_MUNMAP_STATUS	_IO ('A', 0xf6)
-#define SND_PCM_IOCTL_MMAP_FORWARD	_IOW('A', 0xf7, size_t)
+#define SND_PCM_IOCTL_MMAP_FORWARD	_IO ('A', 0xf7)
 #define SND_PCM_IOCTL_AVAIL_UPDATE	_IO ('A', 0xf8)
-#define SND_PCM_IOCTL_CLOSE		_IO ('A', 0xf9)
+#define SND_PCM_IOCTL_ASYNC		_IO ('A', 0xf9)
+#define SND_PCM_IOCTL_CLOSE		_IO ('A', 0xfa)
 
 typedef struct {
 	long result;
 	int cmd;
 	union {
+		struct {
+			int sig;
+			pid_t pid;
+		} async;
 		snd_pcm_info_t info;
 		snd_pcm_params_t params;
 		snd_pcm_params_info_t params_info;

include/pcm.h

@@ -6,6 +6,7 @@
  ****************************************************************************/
 
 #define SND_PCM_NONBLOCK		0x0001
+#define SND_PCM_ASYNC			0x0002
 
 #ifdef __cplusplus
 extern "C" {
@@ -117,6 +118,7 @@ typedef enum {
 	SND_PCM_TYPE_LBSERVER,
 } snd_pcm_type_t;
 
+extern void (*snd_pcm_error)(const char *file, int line, const char *function, const char *fmt, ...);
 
 int snd_pcm_open(snd_pcm_t **handle, char *name, 
 		 int stream, int mode);
@@ -136,6 +138,7 @@ snd_pcm_type_t snd_pcm_type(snd_pcm_t *pcm);
 int snd_pcm_close(snd_pcm_t *pcm);
 int snd_pcm_poll_descriptor(snd_pcm_t *pcm);
 int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock);
+int snd_pcm_async(snd_pcm_t *pcm, int sig, pid_t pid);
 int snd_pcm_info(snd_pcm_t *pcm, snd_pcm_info_t *info);
 int snd_pcm_params_info(snd_pcm_t *pcm, snd_pcm_params_info_t *info);
 int snd_pcm_params(snd_pcm_t *pcm, snd_pcm_params_t *params);

src/pcm/Makefile.am

@@ -3,7 +3,8 @@ EXTRA_LTLIBRARIES = libpcm.la
 
 libpcm_la_SOURCES = pcm.c pcm_hw.c pcm_plugin.c pcm_linear.c pcm_route.c \
 		    pcm_mulaw.c pcm_alaw.c pcm_adpcm.c pcm_rate.c pcm_plug.c \
-	            pcm_misc.c pcm_mmap.c pcm_multi.c pcm_client.c pcm_file.c
+	            pcm_misc.c pcm_mmap.c pcm_multi.c pcm_client.c pcm_file.c \
+		    pcm_share.c
 noinst_HEADERS = pcm_local.h pcm_plugin.h
 
 all: libpcm.la

src/pcm/pcm.c

@@ -23,6 +23,7 @@
 #include <string.h>
 #include <malloc.h>
 #include <errno.h>
+#include <stdarg.h>
 #include <sys/ioctl.h>
 #include <sys/poll.h>
 #include <dlfcn.h>
@@ -83,7 +84,7 @@ int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock)
 {
 	int err;
 	assert(pcm);
-	if ((err = pcm->ops->nonblock(pcm->fast_op_arg, nonblock)) < 0)
+	if ((err = pcm->ops->nonblock(pcm->op_arg, nonblock)) < 0)
 		return err;
 	if (nonblock)
 		pcm->mode |= SND_PCM_NONBLOCK;
@@ -92,6 +93,12 @@ int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock)
 	return 0;
 }
 
+int snd_pcm_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	assert(pcm);
+	return pcm->ops->async(pcm->op_arg, sig, pid);
+}
+
 int snd_pcm_info(snd_pcm_t *pcm, snd_pcm_info_t *info)
 {
 	assert(pcm && info);
@@ -1037,3 +1044,14 @@ ssize_t snd_pcm_write_areas(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas,
 	return err;
 }
 
+void snd_pcm_error_default(const char *file, int line, const char *function, const char *fmt, ...)
+{
+	va_list arg;
+	va_start(arg, fmt);
+	fprintf(stderr, "ALSA PCM lib %s:%i:(%s) ", file, line, function);
+	vfprintf(stderr, fmt, arg);
+	putc('\n', stderr);
+	va_end(arg);
+}
+
+void (*snd_pcm_error)(const char *file, int line, const char *function, const char *fmt, ...) = snd_pcm_error_default;

src/pcm/pcm_adpcm.c

@@ -544,6 +544,7 @@ struct snd_pcm_ops snd_pcm_adpcm_ops = {
 	channel_setup: snd_pcm_plugin_channel_setup,
 	dump: snd_pcm_adpcm_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,

src/pcm/pcm_alaw.c

@@ -412,6 +412,7 @@ struct snd_pcm_ops snd_pcm_alaw_ops = {
 	channel_setup: snd_pcm_plugin_channel_setup,
 	dump: snd_pcm_alaw_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,

src/pcm/pcm_client.c

@@ -175,6 +175,22 @@ static int snd_pcm_client_shm_nonblock(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int nonb
 	return 0;
 }
 
+static int snd_pcm_client_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	snd_pcm_client_t *client = pcm->private;
+	snd_pcm_client_shm_t *ctrl = client->u.shm.ctrl;
+	int err;
+	ctrl->cmd = SND_PCM_IOCTL_ASYNC;
+	ctrl->u.async.sig = sig;
+	if (pid == 0)
+		pid = getpid();
+	ctrl->u.async.pid = pid;
+	err = snd_pcm_client_shm_action(pcm);
+	if (err < 0)
+		return err;
+	return ctrl->result;
+}
+
 static int snd_pcm_client_shm_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	snd_pcm_client_t *client = pcm->private;
@@ -550,6 +566,7 @@ struct snd_pcm_ops snd_pcm_client_ops = {
 	channel_setup: snd_pcm_client_shm_channel_setup,
 	dump: snd_pcm_client_dump,
 	nonblock: snd_pcm_client_shm_nonblock,
+	async: snd_pcm_client_async,
 	mmap_status: snd_pcm_client_shm_mmap_status,
 	mmap_control: snd_pcm_client_shm_mmap_control,
 	mmap_data: snd_pcm_client_shm_mmap_data,

src/pcm/pcm_file.c

@@ -50,6 +50,12 @@ static int snd_pcm_file_nonblock(snd_pcm_t *pcm, int nonblock)
 	return snd_pcm_nonblock(file->slave, nonblock);
 }
 
+static int snd_pcm_file_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	snd_pcm_file_t *file = pcm->private;
+	return snd_pcm_async(file->slave, sig, pid);
+}
+
 static int snd_pcm_file_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	snd_pcm_file_t *file = pcm->private;
@@ -342,6 +348,7 @@ struct snd_pcm_ops snd_pcm_file_ops = {
 	channel_setup: snd_pcm_file_channel_setup,
 	dump: snd_pcm_file_dump,
 	nonblock: snd_pcm_file_nonblock,
+	async: snd_pcm_file_async,
 	mmap_status: snd_pcm_file_mmap_status,
 	mmap_control: snd_pcm_file_mmap_control,
 	mmap_data: snd_pcm_file_mmap_data,

src/pcm/pcm_hw.c

@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <signal.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -29,6 +30,10 @@
 #include <sys/mman.h>
 #include "pcm_local.h"
 
+#ifndef F_SETSIG
+#define F_SETSIG 10
+#endif
+
 typedef struct {
 	int fd;
 	int card, device, subdevice;
@@ -44,9 +49,10 @@ static int snd_pcm_hw_close(snd_pcm_t *pcm)
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
 	free(hw);
-	if (fd >= 0)
+	if (close(fd)) {
-		if (close(fd))
+		ERR("close failed\n");
-			return -errno;
+		return -errno;
+	}
 	return 0;
 }
 
@@ -56,14 +62,53 @@ static int snd_pcm_hw_nonblock(snd_pcm_t *pcm, int nonblock)
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
 
-	if ((flags = fcntl(fd, F_GETFL)) < 0)
+	if ((flags = fcntl(fd, F_GETFL)) < 0) {
+		ERR("F_GETFL failed");
 		return -errno;
+	}
 	if (nonblock)
 		flags |= O_NONBLOCK;
 	else
 		flags &= ~O_NONBLOCK;
-	if (fcntl(fd, F_SETFL, flags) < 0)
+	if (fcntl(fd, F_SETFL, flags) < 0) {
+		ERR("F_SETFL for O_NONBLOCK failed");
 		return -errno;
+	}
+	return 0;
+}
+
+static int snd_pcm_hw_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	long flags;
+	snd_pcm_hw_t *hw = pcm->private;
+	int fd = hw->fd;
+
+	if ((flags = fcntl(fd, F_GETFL)) < 0) {
+		ERR("F_GETFL failed");
+		return -errno;
+	}
+	if (sig >= 0)
+		flags |= O_ASYNC;
+	else
+		flags &= ~O_ASYNC;
+	if (fcntl(fd, F_SETFL, flags) < 0) {
+		ERR("F_SETFL for O_ASYNC failed");
+		return -errno;
+	}
+	if (sig < 0)
+		return 0;
+	if (sig == 0)
+		sig = SIGIO;
+	if (fcntl(fd, F_SETSIG, sig) < 0) {
+		ERR("F_SETSIG failed");
+		return -errno;
+	}
+	if (pid == 0)
+		pid = getpid();
+	if (fcntl(fd, F_SETOWN, pid) < 0) {
+		ERR("F_SETOWN failed");
+		return -errno;
+	}
 	return 0;
 }
 
@@ -71,8 +116,10 @@ static int snd_pcm_hw_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_INFO, info) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_INFO, info) < 0) {
+		ERR("SND_PCM_IOCTL_INFO failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -80,8 +127,10 @@ static int snd_pcm_hw_params_info(snd_pcm_t *pcm, snd_pcm_params_info_t * info)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_PARAMS_INFO, info) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_PARAMS_INFO, info) < 0) {
+		ERR("SND_PCM_IOCTL_PARAMS_INFO failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -89,8 +138,10 @@ static int snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_params_t * params)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_PARAMS, params) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_PARAMS, params) < 0) {
+		ERR("SND_PCM_IOCTL_PARAMS failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -98,8 +149,10 @@ static int snd_pcm_hw_setup(snd_pcm_t *pcm, snd_pcm_setup_t * setup)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_SETUP, setup) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_SETUP, setup) < 0) {
+		ERR("SND_PCM_IOCTL_SETUP failed");
 		return -errno;
+	}
 	if (setup->mmap_shape == SND_PCM_MMAP_UNSPECIFIED) {
 		if (setup->xfer_mode == SND_PCM_XFER_INTERLEAVED)
 			setup->mmap_shape = SND_PCM_MMAP_INTERLEAVED;
@@ -115,8 +168,10 @@ static int snd_pcm_hw_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_INFO, info) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_INFO, info) < 0) {
+		ERR("SND_PCM_IOCTL_CHANNEL_INFO failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -124,8 +179,10 @@ static int snd_pcm_hw_channel_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_PARAMS, params) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_PARAMS, params) < 0) {
+		ERR("SND_PCM_IOCTL_CHANNEL_PARAMS failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -133,8 +190,10 @@ static int snd_pcm_hw_channel_setup(snd_pcm_t *pcm, snd_pcm_channel_setup_t * se
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_SETUP, setup) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_CHANNEL_SETUP, setup) < 0) {
+		ERR("SND_PCM_IOCTL_CHANNEL_SETUP failed");
 		return -errno;
+	}
 	if (hw->mmap_emulation) {
 		if (pcm->setup.mmap_shape == SND_PCM_MMAP_INTERLEAVED) {
 			setup->running_area.addr = pcm->mmap_data;
@@ -157,8 +216,10 @@ static int snd_pcm_hw_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_STATUS, status) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_STATUS, status) < 0) {
+		ERR("SND_PCM_IOCTL_STATUS failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -171,8 +232,10 @@ static int snd_pcm_hw_delay(snd_pcm_t *pcm, ssize_t *delayp)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_DELAY, delayp) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_DELAY, delayp) < 0) {
+		ERR("SND_PCM_IOCTL_DELAY failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -180,8 +243,10 @@ static int snd_pcm_hw_prepare(snd_pcm_t *pcm)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_PREPARE) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_PREPARE) < 0) {
+		ERR("SND_PCM_IOCTL_PREPARE failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -189,8 +254,10 @@ static int snd_pcm_hw_start(snd_pcm_t *pcm)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_START) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_START) < 0) {
+		ERR("SND_PCM_IOCTL_START failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -198,8 +265,10 @@ static int snd_pcm_hw_drop(snd_pcm_t *pcm)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_DROP) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_DROP) < 0) {
+		ERR("SND_PCM_IOCTL_DROP failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -207,8 +276,10 @@ static int snd_pcm_hw_drain(snd_pcm_t *pcm)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_DRAIN) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_DRAIN) < 0) {
+		ERR("SND_PCM_IOCTL_DRAIN failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -216,8 +287,10 @@ static int snd_pcm_hw_pause(snd_pcm_t *pcm, int enable)
 {
 	snd_pcm_hw_t *hw = pcm->private;
 	int fd = hw->fd;
-	if (ioctl(fd, SND_PCM_IOCTL_PAUSE, enable) < 0)
+	if (ioctl(fd, SND_PCM_IOCTL_PAUSE, enable) < 0) {
+		ERR("SND_PCM_IOCTL_PAUSE failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -301,8 +374,10 @@ static int snd_pcm_hw_mmap_status(snd_pcm_t *pcm)
 	void *ptr;
 	ptr = mmap(NULL, sizeof(snd_pcm_mmap_status_t), PROT_READ, MAP_FILE|MAP_SHARED, 
 		   hw->fd, SND_PCM_MMAP_OFFSET_STATUS);
-	if (ptr == MAP_FAILED || ptr == NULL)
+	if (ptr == MAP_FAILED || ptr == NULL) {
+		ERR("status mmap failed");
 		return -errno;
+	}
 	pcm->mmap_status = ptr;
 	return 0;
 }
@@ -313,8 +388,10 @@ static int snd_pcm_hw_mmap_control(snd_pcm_t *pcm)
 	void *ptr;
 	ptr = mmap(NULL, sizeof(snd_pcm_mmap_control_t), PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, 
 		   hw->fd, SND_PCM_MMAP_OFFSET_CONTROL);
-	if (ptr == MAP_FAILED || ptr == NULL)
+	if (ptr == MAP_FAILED || ptr == NULL) {
+		ERR("control mmap failed");
 		return -errno;
+	}
 	pcm->mmap_control = ptr;
 	return 0;
 }
@@ -333,8 +410,10 @@ static int snd_pcm_hw_mmap_data(snd_pcm_t *pcm)
 		ptr = mmap(NULL, pcm->setup.mmap_bytes,
 			   prot, MAP_FILE|MAP_SHARED, 
 			   hw->fd, SND_PCM_MMAP_OFFSET_DATA);
-		if (ptr == MAP_FAILED || ptr == NULL)
+		if (ptr == MAP_FAILED || ptr == NULL) {
+			ERR("data mmap failed");
 			return -errno;
+		}
 	}
 	pcm->mmap_data = ptr;
 	return 0;
@@ -342,15 +421,19 @@ static int snd_pcm_hw_mmap_data(snd_pcm_t *pcm)
 
 static int snd_pcm_hw_munmap_status(snd_pcm_t *pcm)
 {
-	if (munmap((void*)pcm->mmap_status, sizeof(*pcm->mmap_status)) < 0)
+	if (munmap((void*)pcm->mmap_status, sizeof(*pcm->mmap_status)) < 0) {
+		ERR("status munmap failed");
 		return -errno;
+	}
 	return 0;
 }
 
 static int snd_pcm_hw_munmap_control(snd_pcm_t *pcm)
 {
-	if (munmap(pcm->mmap_control, sizeof(*pcm->mmap_control)) < 0)
+	if (munmap(pcm->mmap_control, sizeof(*pcm->mmap_control)) < 0) {
+		ERR("control munmap failed");
 		return -errno;
+	}
 	return 0;
 }
 
@@ -360,8 +443,10 @@ static int snd_pcm_hw_munmap_data(snd_pcm_t *pcm)
 	if (hw->mmap_emulation)
 		free(pcm->mmap_data);
 	else
-		if (munmap(pcm->mmap_data, pcm->setup.mmap_bytes) < 0)
+		if (munmap(pcm->mmap_data, pcm->setup.mmap_bytes) < 0) {
+			ERR("data munmap failed");
 			return -errno;
+		}
 	return 0;
 }
 
@@ -377,15 +462,14 @@ static ssize_t snd_pcm_hw_mmap_forward(snd_pcm_t *pcm, size_t size)
 static ssize_t snd_pcm_hw_avail_update(snd_pcm_t *pcm)
 {
 	snd_pcm_hw_t *hw = pcm->private;
-	int fd = hw->fd;
 	size_t avail;
 	ssize_t err;
 	if (pcm->setup.ready_mode == SND_PCM_READY_ASAP ||
 	    pcm->setup.xrun_mode == SND_PCM_XRUN_ASAP) {
 		ssize_t d;
-		int err = ioctl(fd, SND_PCM_IOCTL_DELAY, &d);
+		int err = snd_pcm_hw_delay(pcm, &d);
 		if (err < 0)
-			return -errno;
+			return err;
 	}
 	if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
 		avail = snd_pcm_mmap_playback_avail(pcm);
@@ -441,6 +525,7 @@ struct snd_pcm_ops snd_pcm_hw_ops = {
 	channel_setup: snd_pcm_hw_channel_setup,
 	dump: snd_pcm_hw_dump,
 	nonblock: snd_pcm_hw_nonblock,
+	async: snd_pcm_hw_async,
 	mmap_status: snd_pcm_hw_mmap_status,
 	mmap_control: snd_pcm_hw_mmap_control,
 	mmap_data: snd_pcm_hw_mmap_data,
@@ -509,6 +594,8 @@ int snd_pcm_hw_open_subdevice(snd_pcm_t **handlep, int card, int device, int sub
 	fmode = O_RDWR;
 	if (mode & SND_PCM_NONBLOCK)
 		fmode |= O_NONBLOCK;
+	if (mode & SND_PCM_ASYNC)
+		fmode |= O_ASYNC;
 	if ((fd = open(filename, fmode)) < 0) {
 		ret = -errno;
 		goto __end;

src/pcm/pcm_linear.c

@@ -255,6 +255,7 @@ struct snd_pcm_ops snd_pcm_linear_ops = {
 	channel_setup: snd_pcm_plugin_channel_setup,
 	dump: snd_pcm_linear_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,

src/pcm/pcm_local.h

@@ -26,9 +26,16 @@
 #include <errno.h>
 #include "asoundlib.h"
 
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
+#define ERR(...) snd_pcm_error(__FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
+#else
+#define ERR(args...) snd_pcm_error(__FILE__, __LINE__, __FUNCTION__, ##args)
+#endif
+
 struct snd_pcm_ops {
 	int (*close)(snd_pcm_t *pcm);
 	int (*nonblock)(snd_pcm_t *pcm, int nonblock);
+	int (*async)(snd_pcm_t *pcm, int sig, pid_t pid);
 	int (*info)(snd_pcm_t *pcm, snd_pcm_info_t *info);
 	int (*params_info)(snd_pcm_t *pcm, snd_pcm_params_info_t *info);
 	int (*params)(snd_pcm_t *pcm, snd_pcm_params_t *params);

src/pcm/pcm_mulaw.c

@@ -429,6 +429,7 @@ struct snd_pcm_ops snd_pcm_mulaw_ops = {
 	channel_setup: snd_pcm_plugin_channel_setup,
 	dump: snd_pcm_mulaw_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,

src/pcm/pcm_multi.c

@@ -72,6 +72,13 @@ static int snd_pcm_multi_nonblock(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int nonblock
 	return 0;
 }
 
+static int snd_pcm_multi_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	snd_pcm_multi_t *multi = pcm->private;
+	snd_pcm_t *slave_0 = multi->slaves[0].pcm;
+	return snd_pcm_async(slave_0, sig, pid);
+}
+
 static int snd_pcm_multi_info(snd_pcm_t *pcm, snd_pcm_info_t *info)
 {
 	snd_pcm_multi_t *multi = pcm->private;
@@ -504,6 +511,7 @@ struct snd_pcm_ops snd_pcm_multi_ops = {
 	channel_setup: snd_pcm_multi_channel_setup,
 	dump: snd_pcm_multi_dump,
 	nonblock: snd_pcm_multi_nonblock,
+	async: snd_pcm_multi_async,
 	mmap_status: snd_pcm_multi_mmap_status,
 	mmap_control: snd_pcm_multi_mmap_control,
 	mmap_data: snd_pcm_multi_mmap_data,

src/pcm/pcm_plug.c

@@ -189,6 +189,12 @@ static int snd_pcm_plug_nonblock(snd_pcm_t *pcm, int nonblock)
 	return snd_pcm_nonblock(plug->slave, nonblock);
 }
 
+static int snd_pcm_plug_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	snd_pcm_plug_t *plug = pcm->private;
+	return snd_pcm_async(plug->slave, sig, pid);
+}
+
 static int snd_pcm_plug_info(snd_pcm_t *pcm, snd_pcm_info_t *info)
 {
 	snd_pcm_plug_t *plug = pcm->private;
@@ -658,6 +664,7 @@ struct snd_pcm_ops snd_pcm_plug_ops = {
 	channel_setup: snd_pcm_plug_channel_setup,
 	dump: snd_pcm_plug_dump,
 	nonblock: snd_pcm_plug_nonblock,
+	async: snd_pcm_plug_async,
 	mmap_status: snd_pcm_plug_mmap_status,
 	mmap_control: snd_pcm_plug_mmap_control,
 	mmap_data: snd_pcm_plug_mmap_data,

src/pcm/pcm_plugin.c

@@ -39,6 +39,12 @@ int snd_pcm_plugin_nonblock(snd_pcm_t *pcm, int nonblock)
 	return snd_pcm_nonblock(plugin->slave, nonblock);
 }
 
+int snd_pcm_plugin_async(snd_pcm_t *pcm, int sig, pid_t pid)
+{
+	snd_pcm_plugin_t *plugin = pcm->private;
+	return snd_pcm_async(plugin->slave, sig, pid);
+}
+
 int snd_pcm_plugin_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	snd_pcm_plugin_t *plugin = pcm->private;

src/pcm/pcm_plugin.h

@@ -32,6 +32,7 @@ typedef struct {
 
 int snd_pcm_plugin_close(snd_pcm_t *pcm);
 int snd_pcm_plugin_nonblock(snd_pcm_t *pcm, int nonblock);
+int snd_pcm_plugin_async(snd_pcm_t *pcm, int sig, pid_t pid);
 int snd_pcm_plugin_info(snd_pcm_t *pcm, snd_pcm_info_t * info);
 int snd_pcm_plugin_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info);
 int snd_pcm_plugin_channel_params(snd_pcm_t *pcm, snd_pcm_channel_params_t * params);

src/pcm/pcm_rate.c

@@ -576,6 +576,7 @@ struct snd_pcm_ops snd_pcm_rate_ops = {
 	channel_setup: snd_pcm_plugin_channel_setup,
 	dump: snd_pcm_rate_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,

src/pcm/pcm_route.c

@@ -695,6 +695,7 @@ struct snd_pcm_ops snd_pcm_route_ops = {
 	channel_setup: snd_pcm_route_channel_setup,
 	dump: snd_pcm_route_dump,
 	nonblock: snd_pcm_plugin_nonblock,
+	async: snd_pcm_plugin_async,
 	mmap_status: snd_pcm_plugin_mmap_status,
 	mmap_control: snd_pcm_plugin_mmap_control,
 	mmap_data: snd_pcm_plugin_mmap_data,