- use pthread_atfork() to disable open sound streams in the child after a fork.

Obviusly sound won't work in child process but at least we don't leak fds
  from the parent. Now any operation on the device fd in the child will result
  in an EBADF error, which seems somewhat clean to me.

- flush our unix socket properly on RESET ioctl


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@953 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/utils/padsp.c

@@ -60,6 +60,7 @@ typedef struct fd_info fd_info;
 struct fd_info {
     pthread_mutex_t mutex;
     int ref;
+    int unusable;
     
     fd_info_type_t type;
     int app_fd, thread_fd;
@@ -82,6 +83,7 @@ struct fd_info {
 };
 
 static int dsp_drain(fd_info *i);
+static void fd_info_remove_from_list(fd_info *i);
 
 static pthread_mutex_t fd_infos_mutex = PTHREAD_MUTEX_INITIALIZER;
 static pthread_mutex_t func_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -289,15 +291,102 @@ static char *client_name(char *buf, size_t n) {
     return buf;
 }
 
+static void atfork_prepare(void) {
+    fd_info *i;
+
+    debug(__FILE__": atfork_prepare() enter\n");
+    
+    function_enter();
+
+    pthread_mutex_lock(&fd_infos_mutex);
+
+    for (i = fd_infos; i; i = i->next) {
+        pthread_mutex_lock(&i->mutex);
+        pa_threaded_mainloop_lock(i->mainloop);
+    }
+
+    pthread_mutex_lock(&func_mutex);
+
+    
+    debug(__FILE__": atfork_prepare() exit\n");
+}
+
+static void atfork_parent(void) {
+    fd_info *i;
+    
+    debug(__FILE__": atfork_parent() enter\n");
+
+    pthread_mutex_unlock(&func_mutex);
+
+    for (i = fd_infos; i; i = i->next) {
+        pa_threaded_mainloop_unlock(i->mainloop);
+        pthread_mutex_unlock(&i->mutex);
+    }
+
+    pthread_mutex_unlock(&fd_infos_mutex);
+
+    function_exit();
+    
+    debug(__FILE__": atfork_parent() exit\n");
+}
+
+static void atfork_child(void) {
+    fd_info *i;
+    
+    debug(__FILE__": atfork_child() enter\n");
+
+    /* We do only the bare minimum to get all fds closed */
+    pthread_mutex_init(&func_mutex, NULL);
+    pthread_mutex_init(&fd_infos_mutex, NULL);
+    
+    for (i = fd_infos; i; i = i->next) {
+        pthread_mutex_init(&i->mutex, NULL);
+
+        if (i->context) {
+            pa_context_disconnect(i->context);
+            pa_context_unref(i->context);
+            i->context = NULL;
+        }
+
+        if (i->stream) {
+            pa_stream_unref(i->stream);
+            i->stream = NULL;
+        }
+
+        if (i->app_fd >= 0) {
+            close(i->app_fd);
+            i->app_fd = -1;
+        }
+
+        if (i->thread_fd >= 0) {
+            close(i->thread_fd);
+            i->thread_fd = -1;
+        }
+
+        i->unusable = 1;
+    }
+
+    function_exit();
+
+    debug(__FILE__": atfork_child() exit\n");
+}
+
+static void install_atfork(void) {
+    pthread_atfork(atfork_prepare, atfork_parent, atfork_child);
+}
+
 static fd_info* fd_info_new(fd_info_type_t type, int *_errno) {
     fd_info *i;
     int sfds[2] = { -1, -1 };
     char name[64];
+    static pthread_once_t install_atfork_once = PTHREAD_ONCE_INIT;
 
     debug(__FILE__": fd_info_new()\n");
 
     signal(SIGPIPE, SIG_IGN); /* Yes, ugly as hell */
 
+    pthread_once(&install_atfork_once, install_atfork);
+    
     if (!(i = malloc(sizeof(fd_info)))) {
         *_errno = ENOMEM;
         goto fail;
@@ -313,6 +402,7 @@ static fd_info* fd_info_new(fd_info_type_t type, int *_errno) {
     pthread_mutex_init(&i->mutex, NULL);
     i->ref = 1;
     i->buf = NULL;
+    i->unusable = 0;
     PA_LLIST_INIT(fd_info, i);
 
     reset_params(i);
@@ -404,7 +494,7 @@ static fd_info* fd_info_find(int fd) {
     pthread_mutex_lock(&fd_infos_mutex);
     
     for (i = fd_infos; i; i = i->next)
-        if (i->app_fd == fd) {
+        if (i->app_fd == fd && !i->unusable) {
             fd_info_ref(i);
             break;
         }
@@ -546,7 +636,7 @@ static int create_stream(fd_info *i) {
 
     fix_metrics(i);
 
-    if (!(i->stream = pa_stream_new(i->context, "audio stream", &i->sample_spec, NULL))) {
+    if (!(i->stream = pa_stream_new(i->context, "Audio Stream", &i->sample_spec, NULL))) {
         debug(__FILE__": pa_stream_new() failed: %s\n", pa_strerror(pa_context_errno(i->context)));
         goto fail;
     }
@@ -784,6 +874,30 @@ static void success_cb(pa_stream *s, int success, void *userdata) {
     pa_threaded_mainloop_signal(i->mainloop, 0);
 }
 
+static int dsp_flush_socket(fd_info *i) {
+    int l;
+        
+    if (i->thread_fd < 0)
+        return -1;
+
+    if (ioctl(i->thread_fd, SIOCINQ, &l) < 0) {
+        debug(__FILE__": SIOCINQ: %s\n", strerror(errno));
+        return -1;
+    }
+
+    while (l > 0) {
+        char buf[1024];
+        size_t k;
+
+        k = (size_t) l > sizeof(buf) ? sizeof(buf) : (size_t) l;
+        if (read(i->thread_fd, buf, k) < 0)
+            debug(__FILE__": read(): %s\n", strerror(errno));
+        l -= k;
+    }
+
+    return 0;
+}
+
 static int dsp_empty_socket(fd_info *i) {
     int ret = -1;
     
@@ -791,7 +905,7 @@ static int dsp_empty_socket(fd_info *i) {
     for (;;) {
         int l;
         
-        if (i->thread_fd < 0)
+        if (i->thread_fd < 0 || !i->stream)
             break;
         
         if (ioctl(i->thread_fd, SIOCINQ, &l) < 0) {
@@ -861,8 +975,6 @@ static int dsp_trigger(fd_info *i) {
     pa_operation *o = NULL;
     int r = -1;
 
-    fd_info_copy_data(i, 1);
-
     if (!i->stream)
         return 0;
 
@@ -926,6 +1038,7 @@ static int dsp_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno)
         case SNDCTL_DSP_SPEED: {
             pa_sample_spec ss;
             int valid;
+            char t[256];
             
             debug(__FILE__": SNDCTL_DSP_SPEED: %i\n", *(int*) argp);
 
@@ -939,6 +1052,8 @@ static int dsp_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno)
                 free_stream(i);
             }
             
+            debug(__FILE__": ss: %s\n", pa_sample_spec_snprint(t, sizeof(t), &i->sample_spec));
+
             pa_threaded_mainloop_unlock(i->mainloop);
 
             if (!valid) {
@@ -1063,6 +1178,7 @@ static int dsp_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno)
             pa_threaded_mainloop_lock(i->mainloop);
 
             free_stream(i);
+            dsp_flush_socket(i);
             reset_params(i);
             
             pa_threaded_mainloop_unlock(i->mainloop);