From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Wed, 1 Apr 2020 09:13:28 +0000 (+0900)
Subject: seq: add global method to get devnode string for ALSA Sequencer
X-Git-Tag: v0.1.0~308
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=e5609cd6a9c9dca793adbf7f4192b1d983439703;p=alsa-gobject.git

seq: add global method to get devnode string for ALSA Sequencer

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---

diff --git a/src/seq/alsaseq.map b/src/seq/alsaseq.map
index 0a34538..00b636f 100644
--- a/src/seq/alsaseq.map
+++ b/src/seq/alsaseq.map
@@ -17,6 +17,7 @@ ALSA_GOBJECT_0_0_0 {
     "alsaseq_query_subscribe_type_get_type";
 
     "alsaseq_get_seq_sysname";
+    "alsaseq_get_seq_devnode";
   local:
     *;
 };
diff --git a/src/seq/query.c b/src/seq/query.c
index db9ed3a..91356e4 100644
--- a/src/seq/query.c
+++ b/src/seq/query.c
@@ -52,3 +52,45 @@ void alsaseq_get_seq_sysname(gchar **sysname, GError **error)
     udev_device_unref(dev);
     udev_unref(ctx);
 }
+
+/**
+ * alsaseq_get_seq_devnode:
+ * @devnode: (out): The devnode of ALSA Sequencer.
+ * @error: A #GError.
+ *
+ * Allocate devnode string for ALSA Sequencer and return it when exists.
+ */
+void alsaseq_get_seq_devnode(gchar **devnode, GError **error)
+{
+    struct udev *ctx;
+    struct udev_device *dev;
+    const char *node;
+
+    ctx = udev_new();
+    if (ctx == NULL) {
+        generate_error(error, errno);
+        return;
+    }
+
+    dev = udev_device_new_from_subsystem_sysname(ctx, "sound", SEQ_SYSNAME);
+    if (dev == NULL) {
+        generate_error(error, ENODEV);
+        udev_unref(ctx);
+        return;
+    }
+
+    node = udev_device_get_devnode(dev);
+    if (node == NULL) {
+        generate_error(error, ENODEV);
+        udev_device_unref(dev);
+        udev_unref(ctx);
+        return;
+    }
+
+    *devnode = strdup(node);
+    if (*devnode == NULL)
+        generate_error(error, ENOMEM);
+
+    udev_device_unref(dev);
+    udev_unref(ctx);
+}
diff --git a/src/seq/query.h b/src/seq/query.h
index 98be374..1f428f4 100644
--- a/src/seq/query.h
+++ b/src/seq/query.h
@@ -9,6 +9,8 @@ G_BEGIN_DECLS
 
 void alsaseq_get_seq_sysname(gchar **sysname, GError **error);
 
+void alsaseq_get_seq_devnode(gchar **devnode, GError **error);
+
 G_END_DECLS
 
 #endif