Currently midi capable programs can control midi hardware, but

cannot cooperate with other programs.  The aim of this change is
to allow any program to send midi data to other programs as they
were midi hardware. For instance, this change should solve the
longstanding problem of using a midi sequencer with software
synthesizers. More precisely:

 - new midicat(1) utility (actually hardlink to aucat(1)).
   it creates software midi thru boxes, allowing programs
   to send midi messages to other programs as they were
   midi(4) hardware.

 - new midi api in libsndio (see mio_open(3)), to access
   midi(4) devices and midicat(1) sockets in a uniform way.

 - new device naming scheme <service>:<unit>[.<option>],
   common to audio and midi.

 - new sndio(7) manual describing concepts and naming

The current audio device naming still works, but people having
scripts or configuration files containing device names could read
the sndio(7) man page and slowly start updating device names.

discussed with jakemsr@ and deraadt@, help form jmc@

1 files changed, 21 insertions, 6 deletions

diff --git a/lib/libsndio/aucat.c b/lib/libsndio/aucat.c
index cefa0443f0d..5e249f35961 100644
--- a/lib/libsndio/aucat.c
+++ b/lib/libsndio/aucat.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: aucat.c,v 1.21 2009/05/16 12:10:52 ratchov Exp $	*/
+/*	$OpenBSD: aucat.c,v 1.22 2009/07/25 08:44:26 ratchov Exp $	*/
 /*
  * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
  *
@@ -167,22 +167,34 @@ aucat_runmsg(struct aucat_hdl *hdl)
 }
 
 struct sio_hdl *
-sio_open_aucat(char *path, unsigned mode, int nbio)
+sio_open_aucat(char *str, unsigned mode, int nbio)
 {
 	extern char *__progname;
 	int s;
+	char unit[4], *sep, *opt;
 	struct aucat_hdl *hdl;
 	struct sockaddr_un ca;	
 	socklen_t len = sizeof(struct sockaddr_un);
 	uid_t uid;
 
-	if (path == NULL)
-		path = SIO_AUCAT_PATH;
+	sep = strchr(str, '.');
+	if (sep == NULL) {
+		opt = "default";
+		strlcpy(unit, str, sizeof(unit));
+	} else {
+		opt = sep + 1;
+		if (sep - str >= sizeof(unit)) {
+			DPRINTF("sio_open_aucat: %s: too long\n", str);
+			return NULL;
+		}
+		strlcpy(unit, str, opt - str);
+	}
+	DPRINTF("sio_open_aucat: trying %s -> %s.%s\n", str, unit, opt);
 	uid = geteuid();
-	if (strchr(path, '/') != NULL)
+	if (strchr(str, '/') != NULL)
 		return NULL;
 	snprintf(ca.sun_path, sizeof(ca.sun_path),
-	    "/tmp/aucat-%u/%s", uid, path);
+	    "/tmp/aucat-%u/softaudio%s", uid, unit);
 	ca.sun_family = AF_UNIX;
 
 	hdl = malloc(sizeof(struct aucat_hdl));
@@ -196,6 +208,7 @@ sio_open_aucat(char *path, unsigned mode, int nbio)
 	while (connect(s, (struct sockaddr *)&ca, len) < 0) {
 		if (errno == EINTR)
 			continue;
+		DPERROR("sio_open_aucat: connect");
 		goto bad_connect;
 	}
 	if (fcntl(s, F_SETFD, FD_CLOEXEC) < 0) {
@@ -222,6 +235,8 @@ sio_open_aucat(char *path, unsigned mode, int nbio)
 		hdl->wmsg.u.hello.proto |= AMSG_REC;
 	strlcpy(hdl->wmsg.u.hello.who, __progname,
 	    sizeof(hdl->wmsg.u.hello.who));
+	strlcpy(hdl->wmsg.u.hello.opt, opt,
+	    sizeof(hdl->wmsg.u.hello.opt));
 	hdl->wtodo = sizeof(struct amsg);
 	if (!aucat_wmsg(hdl))
 		goto bad_connect;