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Diffstat (limited to 'src/modules/module-udev-detect.c')
-rw-r--r--src/modules/module-udev-detect.c391
1 files changed, 332 insertions, 59 deletions
diff --git a/src/modules/module-udev-detect.c b/src/modules/module-udev-detect.c
index 1ad6fa2d..1b1e9c1a 100644
--- a/src/modules/module-udev-detect.c
+++ b/src/modules/module-udev-detect.c
@@ -25,13 +25,17 @@
#include <errno.h>
#include <limits.h>
+#include <dirent.h>
#include <sys/inotify.h>
#include <libudev.h>
+#include <pulse/timeval.h>
+
#include <pulsecore/modargs.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/namereg.h>
+#include <pulsecore/ratelimit.h>
#include "module-udev-detect-symdef.h"
@@ -39,18 +43,25 @@ PA_MODULE_AUTHOR("Lennart Poettering");
PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(TRUE);
+PA_MODULE_USAGE(
+ "tsched=<enable system timer based scheduling mode?> "
+ "ignore_dB=<ignore dB information from the device?>");
struct device {
char *path;
- pa_bool_t accessible;
+ pa_bool_t need_verify;
char *card_name;
+ char *args;
uint32_t module;
+ pa_ratelimit ratelimit;
};
struct userdata {
pa_core *core;
pa_hashmap *devices;
- pa_bool_t use_tsched;
+
+ pa_bool_t use_tsched:1;
+ pa_bool_t ignore_dB:1;
struct udev* udev;
struct udev_monitor *monitor;
@@ -62,14 +73,18 @@ struct userdata {
static const char* const valid_modargs[] = {
"tsched",
+ "ignore_dB",
NULL
};
+static int setup_inotify(struct userdata *u);
+
static void device_free(struct device *d) {
pa_assert(d);
pa_xfree(d->path);
pa_xfree(d->card_name);
+ pa_xfree(d->args);
pa_xfree(d);
}
@@ -88,35 +103,204 @@ static const char *path_get_card_id(const char *path) {
return e + 5;
}
+static pa_bool_t is_card_busy(const char *id) {
+ char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL;
+ DIR *card_dir = NULL, *pcm_dir = NULL;
+ FILE *status_file = NULL;
+ size_t len;
+ struct dirent *space = NULL, *de;
+ pa_bool_t busy = FALSE;
+ int r;
+
+ pa_assert(id);
+
+ /* This simply uses /proc/asound/card.../pcm.../sub.../status to
+ * check whether there is still a process using this audio device. */
+
+ card_path = pa_sprintf_malloc("/proc/asound/card%s", id);
+
+ if (!(card_dir = opendir(card_path))) {
+ pa_log_warn("Failed to open %s: %s", card_path, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ len = offsetof(struct dirent, d_name) + fpathconf(dirfd(card_dir), _PC_NAME_MAX) + 1;
+ space = pa_xmalloc(len);
+
+ for (;;) {
+ de = NULL;
+
+ if ((r = readdir_r(card_dir, space, &de)) != 0) {
+ pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
+ goto fail;
+ }
+
+ if (!de)
+ break;
+
+ if (!pa_startswith(de->d_name, "pcm"))
+ continue;
+
+ pa_xfree(pcm_path);
+ pcm_path = pa_sprintf_malloc("%s/%s", card_path, de->d_name);
+
+ if (pcm_dir)
+ closedir(pcm_dir);
+
+ if (!(pcm_dir = opendir(pcm_path))) {
+ pa_log_warn("Failed to open %s: %s", pcm_path, pa_cstrerror(errno));
+ continue;
+ }
+
+ for (;;) {
+ char line[32];
+
+ if ((r = readdir_r(pcm_dir, space, &de)) != 0) {
+ pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
+ goto fail;
+ }
+
+ if (!de)
+ break;
+
+ if (!pa_startswith(de->d_name, "sub"))
+ continue;
+
+ pa_xfree(sub_status);
+ sub_status = pa_sprintf_malloc("%s/%s/status", pcm_path, de->d_name);
+
+ if (status_file)
+ fclose(status_file);
+
+ if (!(status_file = fopen(sub_status, "r"))) {
+ pa_log_warn("Failed to open %s: %s", sub_status, pa_cstrerror(errno));
+ continue;
+ }
+
+ if (!(fgets(line, sizeof(line)-1, status_file))) {
+ pa_log_warn("Failed to read from %s: %s", sub_status, pa_cstrerror(errno));
+ continue;
+ }
+
+ if (!pa_streq(line, "closed\n")) {
+ busy = TRUE;
+ break;
+ }
+ }
+ }
+
+fail:
+
+ pa_xfree(card_path);
+ pa_xfree(pcm_path);
+ pa_xfree(sub_status);
+ pa_xfree(space);
+
+ if (card_dir)
+ closedir(card_dir);
+
+ if (pcm_dir)
+ closedir(pcm_dir);
+
+ if (status_file)
+ fclose(status_file);
+
+ return busy;
+}
+
static void verify_access(struct userdata *u, struct device *d) {
char *cd;
pa_card *card;
+ pa_bool_t accessible;
pa_assert(u);
pa_assert(d);
- if (!(card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD)))
- return;
-
cd = pa_sprintf_malloc("%s/snd/controlC%s", udev_get_dev_path(u->udev), path_get_card_id(d->path));
- d->accessible = access(cd, W_OK) >= 0;
- pa_log_info("%s is accessible: %s", cd, pa_yes_no(d->accessible));
+ accessible = access(cd, R_OK|W_OK) >= 0;
+ pa_log_debug("%s is accessible: %s", cd, pa_yes_no(accessible));
+
pa_xfree(cd);
- pa_card_suspend(card, !d->accessible, PA_SUSPEND_SESSION);
+ if (d->module == PA_INVALID_INDEX) {
+
+ /* If we are not loaded, try to load */
+
+ if (accessible) {
+ pa_module *m;
+ pa_bool_t busy;
+
+ /* Check if any of the PCM devices that belong to this
+ * card are currently busy. If they are, don't try to load
+ * right now, to make sure the probing phase can
+ * successfully complete. When the current user of the
+ * device closes it we will get another notification via
+ * inotify and can then recheck. */
+
+ busy = is_card_busy(path_get_card_id(d->path));
+ pa_log_debug("%s is busy: %s", d->path, pa_yes_no(busy));
+
+ if (!busy) {
+
+ /* So, why do we rate limit here? It's certainly ugly,
+ * but there seems to be no other way. Problem is
+ * this: if we are unable to configure/probe an audio
+ * device after opening it we will close it again and
+ * the module initialization will fail. This will then
+ * cause an inotify event on the device node which
+ * will be forwarded to us. We then try to reopen the
+ * audio device again, practically entering a busy
+ * loop.
+ *
+ * A clean fix would be if we would be able to ignore
+ * our own inotify close events. However, inotify
+ * lacks such functionality. Also, during probing of
+ * the device we cannot really distuingish between
+ * other processes causing EBUSY or ourselves, which
+ * means we have no way to figure out if the probing
+ * during opening was canceled by a "try again"
+ * failure or a "fatal" failure. */
+
+ if (pa_ratelimit_test(&d->ratelimit)) {
+ pa_log_debug("Loading module-alsa-card with arguments '%s'", d->args);
+ m = pa_module_load(u->core, "module-alsa-card", d->args);
+
+ if (m) {
+ d->module = m->index;
+ pa_log_info("Card %s (%s) module loaded.", d->path, d->card_name);
+ } else
+ pa_log_info("Card %s (%s) failed to load module.", d->path, d->card_name);
+ } else
+ pa_log_warn("Tried to configure %s (%s) more often than %u times in %llus",
+ d->path,
+ d->card_name,
+ d->ratelimit.burst,
+ (long long unsigned) (d->ratelimit.interval / PA_USEC_PER_SEC));
+ }
+ }
+
+ } else {
+
+ /* If we are already loaded update suspend status with
+ * accessible boolean */
+
+ if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD)))
+ pa_card_suspend(card, !accessible, PA_SUSPEND_SESSION);
+ }
}
static void card_changed(struct userdata *u, struct udev_device *dev) {
struct device *d;
const char *path;
const char *t;
- char *card_name, *args;
- pa_module *m;
char *n;
pa_assert(u);
pa_assert(dev);
+ /* Maybe /dev/snd is now available? */
+ setup_inotify(u);
+
path = udev_device_get_devpath(dev);
if ((d = pa_hashmap_get(u->devices, path))) {
@@ -124,42 +308,34 @@ static void card_changed(struct userdata *u, struct udev_device *dev) {
return;
}
+ d = pa_xnew0(struct device, 1);
+ d->path = pa_xstrdup(path);
+ d->module = PA_INVALID_INDEX;
+ PA_INIT_RATELIMIT(d->ratelimit, 10*PA_USEC_PER_SEC, 5);
+
if (!(t = udev_device_get_property_value(dev, "PULSE_NAME")))
if (!(t = udev_device_get_property_value(dev, "ID_ID")))
if (!(t = udev_device_get_property_value(dev, "ID_PATH")))
t = path_get_card_id(path);
n = pa_namereg_make_valid_name(t);
+ d->card_name = pa_sprintf_malloc("alsa_card.%s", n);
+ d->args = pa_sprintf_malloc("device_id=\"%s\" "
+ "name=\"%s\" "
+ "card_name=\"%s\" "
+ "tsched=%s "
+ "ignore_dB=%s "
+ "card_properties=\"module-udev-detect.discovered=1\"",
+ path_get_card_id(path),
+ n,
+ d->card_name,
+ pa_yes_no(u->use_tsched),
+ pa_yes_no(u->ignore_dB));
+ pa_xfree(n);
- card_name = pa_sprintf_malloc("alsa_card.%s", n);
- args = pa_sprintf_malloc("device_id=\"%s\" "
- "name=\"%s\" "
- "card_name=\"%s\" "
- "tsched=%i "
- "card_properties=\"module-udev-detect.discovered=1\"",
- path_get_card_id(path),
- n,
- card_name,
- (int) u->use_tsched);
-
- pa_log_debug("Loading module-alsa-card with arguments '%s'", args);
- m = pa_module_load(u->core, "module-alsa-card", args);
- pa_xfree(args);
-
- if (m) {
- pa_log_info("Card %s (%s) added.", path, n);
-
- d = pa_xnew(struct device, 1);
- d->path = pa_xstrdup(path);
- d->card_name = card_name;
- d->module = m->index;
- d->accessible = TRUE;
-
- pa_hashmap_put(u->devices, d->path, d);
- } else
- pa_xfree(card_name);
+ pa_hashmap_put(u->devices, d->path, d);
- pa_xfree(n);
+ verify_access(u, d);
}
static void remove_card(struct userdata *u, struct udev_device *dev) {
@@ -172,7 +348,10 @@ static void remove_card(struct userdata *u, struct udev_device *dev) {
return;
pa_log_info("Card %s removed.", d->path);
- pa_module_unload_request_by_index(u->core, d->module, TRUE);
+
+ if (d->module != PA_INVALID_INDEX)
+ pa_module_unload_request_by_index(u->core, d->module, TRUE);
+
device_free(d);
}
@@ -249,6 +428,34 @@ fail:
u->udev_io = NULL;
}
+static pa_bool_t pcm_node_belongs_to_device(
+ struct device *d,
+ const char *node) {
+
+ char *cd;
+ pa_bool_t b;
+
+ cd = pa_sprintf_malloc("pcmC%sD", path_get_card_id(d->path));
+ b = pa_startswith(node, cd);
+ pa_xfree(cd);
+
+ return b;
+}
+
+static pa_bool_t control_node_belongs_to_device(
+ struct device *d,
+ const char *node) {
+
+ char *cd;
+ pa_bool_t b;
+
+ cd = pa_sprintf_malloc("controlC%s", path_get_card_id(d->path));
+ b = pa_streq(node, cd);
+ pa_xfree(cd);
+
+ return b;
+}
+
static void inotify_cb(
pa_mainloop_api*a,
pa_io_event* e,
@@ -262,10 +469,13 @@ static void inotify_cb(
} buf;
struct userdata *u = userdata;
static int type = 0;
- pa_bool_t verify = FALSE;
+ pa_bool_t deleted = FALSE;
+ struct device *d;
+ void *state;
for (;;) {
ssize_t r;
+ struct inotify_event *event;
pa_zero(buf);
if ((r = pa_read(fd, &buf, sizeof(buf), &type)) <= 0) {
@@ -277,25 +487,60 @@ static void inotify_cb(
goto fail;
}
- if ((buf.e.mask & IN_CLOSE_WRITE) && pa_startswith(buf.e.name, "pcmC"))
- verify = TRUE;
+ event = &buf.e;
+ while (r > 0) {
+ size_t len;
+
+ if ((size_t) r < sizeof(struct inotify_event)) {
+ pa_log("read() too short.");
+ goto fail;
+ }
+
+ len = sizeof(struct inotify_event) + event->len;
+
+ if ((size_t) r < len) {
+ pa_log("Payload missing.");
+ goto fail;
+ }
+
+ /* From udev we get the guarantee that the control
+ * device's ACL is changed last. To avoid races when ACLs
+ * are changed we hence watch only the control device */
+ if (((event->mask & IN_ATTRIB) && pa_startswith(event->name, "controlC")))
+ PA_HASHMAP_FOREACH(d, u->devices, state)
+ if (control_node_belongs_to_device(d, event->name))
+ d->need_verify = TRUE;
+
+ /* ALSA doesn't really give us any guarantee on the closing
+ * order, so let's simply hope */
+ if (((event->mask & IN_CLOSE_WRITE) && pa_startswith(event->name, "pcmC")))
+ PA_HASHMAP_FOREACH(d, u->devices, state)
+ if (pcm_node_belongs_to_device(d, event->name))
+ d->need_verify = TRUE;
+
+ /* /dev/snd/ might have been removed */
+ if ((event->mask & (IN_DELETE_SELF|IN_MOVE_SELF)))
+ deleted = TRUE;
+
+ event = (struct inotify_event*) ((uint8_t*) event + len);
+ r -= len;
+ }
}
- if (verify) {
- struct device *d;
- void *state;
-
- pa_log_debug("Verifying access.");
-
- PA_HASHMAP_FOREACH(d, u->devices, state)
+ PA_HASHMAP_FOREACH(d, u->devices, state)
+ if (d->need_verify) {
+ d->need_verify = FALSE;
verify_access(u, d);
- }
+ }
- return;
+ if (!deleted)
+ return;
fail:
- a->io_free(u->inotify_io);
- u->inotify_io = NULL;
+ if (u->inotify_io) {
+ a->io_free(u->inotify_io);
+ u->inotify_io = NULL;
+ }
if (u->inotify_fd >= 0) {
pa_close(u->inotify_fd);
@@ -307,17 +552,38 @@ static int setup_inotify(struct userdata *u) {
char *dev_snd;
int r;
+ if (u->inotify_fd >= 0)
+ return 0;
+
if ((u->inotify_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
pa_log("inotify_init1() failed: %s", pa_cstrerror(errno));
return -1;
}
dev_snd = pa_sprintf_malloc("%s/snd", udev_get_dev_path(u->udev));
- r = inotify_add_watch(u->inotify_fd, dev_snd, IN_CLOSE_WRITE);
+ r = inotify_add_watch(u->inotify_fd, dev_snd, IN_ATTRIB|IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MOVE_SELF);
pa_xfree(dev_snd);
if (r < 0) {
- pa_log("inotify_add_watch() failed: %s", pa_cstrerror(errno));
+ int saved_errno = errno;
+
+ pa_close(u->inotify_fd);
+ u->inotify_fd = -1;
+
+ if (saved_errno == ENOENT) {
+ pa_log_debug("/dev/snd/ is apparently not existing yet, retrying to create inotify watch later.");
+ return 0;
+ }
+
+ if (saved_errno == ENOSPC) {
+ pa_log("You apparently ran out of inotify watches, probably because Tracker/Beagle took them all away. "
+ "I wished people would do their homework first and fix inotify before using it for watching whole "
+ "directory trees which is something the current inotify is certainly not useful for. "
+ "Please make sure to drop the Tracker/Beagle guys a line complaining about their broken use of inotify.");
+ return 0;
+ }
+
+ pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno));
return -1;
}
@@ -332,6 +598,7 @@ int pa__init(pa_module *m) {
struct udev_enumerate *enumerate = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
int fd;
+ pa_bool_t use_tsched = TRUE, ignore_dB = FALSE;
pa_assert(m);
@@ -343,13 +610,19 @@ int pa__init(pa_module *m) {
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
- u->use_tsched = TRUE;
u->inotify_fd = -1;
- if (pa_modargs_get_value_boolean(ma, "tsched", &u->use_tsched) < 0) {
- pa_log("Failed to parse tsched argument.");
+ if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
+ pa_log("Failed to parse tsched= argument.");
+ goto fail;
+ }
+ u->use_tsched = use_tsched;
+
+ if (pa_modargs_get_value_boolean(ma, "ignore_dB", &ignore_dB) < 0) {
+ pa_log("Failed to parse ignore_dB= argument.");
goto fail;
}
+ u->ignore_dB = ignore_dB;
if (!(u->udev = udev_new())) {
pa_log("Failed to initialize udev library.");
@@ -402,7 +675,7 @@ int pa__init(pa_module *m) {
udev_enumerate_unref(enumerate);
- pa_log_info("Loaded %u modules.", pa_hashmap_size(u->devices));
+ pa_log_info("Found %u cards.", pa_hashmap_size(u->devices));
pa_modargs_free(ma);
generated by cgit (git 2.34.1) at 2025-10-31 13:45:26 +0000