diff options
| author | Alexandre Ratchov <ratchov@cvs.openbsd.org> | 2019-07-12 06:30:56 +0000 |
|---|---|---|
| committer | Alexandre Ratchov <ratchov@cvs.openbsd.org> | 2019-07-12 06:30:56 +0000 |
| commit | fdf5bff0e600532b05030b1ca0071ee9a2be28f2 (patch) | |
| tree | 3db7c00a171911fb9dd337419f3f7faf764399de /lib | |
| parent | 77dbe3a6d01aec61ec827f376205fb6e73ab7b26 (diff) | |
Add affinity between the program and its mixer control.
Currently, if there are two instances of the same program, sndiod will
allocate one volume control to each. If both programs disconnect and
reconnect, the information of which control is assigned to which
program is lost. This makes difficult to run two instances of a player
and crossfade between each other with a MIDI controller.
To address this, the program chooses a 32-bit "id" (for now the
process pid) and sends it to the server. The server records the id in
the client's slot structure. When the server accepts a new
connection, it uses the id to identify the slot the client used during
the previous connection; if it was not recycled yet, it's assigned to
the program.
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libsndio/amsg.h | 4 | ||||
| -rw-r--r-- | lib/libsndio/aucat.c | 3 |
2 files changed, 4 insertions, 3 deletions
diff --git a/lib/libsndio/amsg.h b/lib/libsndio/amsg.h index 760f7ec7ad8..a22ea0e1078 100644 --- a/lib/libsndio/amsg.h +++ b/lib/libsndio/amsg.h @@ -1,4 +1,4 @@ -/* $OpenBSD: amsg.h,v 1.11 2018/07/28 09:07:48 ratchov Exp $ */ +/* $OpenBSD: amsg.h,v 1.12 2019/07/12 06:30:55 ratchov Exp $ */ /* * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org> * @@ -99,7 +99,7 @@ struct amsg { #define AMSG_VERSION 7 uint8_t version; /* protocol version */ uint8_t devnum; /* device number */ - uint32_t _reserved[1]; /* for future use */ + uint32_t id; /* client id */ #define AMSG_OPTMAX 12 char opt[AMSG_OPTMAX]; /* profile name */ char who[12]; /* hint for leases */ diff --git a/lib/libsndio/aucat.c b/lib/libsndio/aucat.c index b418f4e0fdd..4b86ed3fdb2 100644 --- a/lib/libsndio/aucat.c +++ b/lib/libsndio/aucat.c @@ -1,4 +1,4 @@ -/* $OpenBSD: aucat.c,v 1.76 2019/06/29 06:05:26 ratchov Exp $ */ +/* $OpenBSD: aucat.c,v 1.77 2019/07/12 06:30:55 ratchov Exp $ */ /* * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org> * @@ -486,6 +486,7 @@ _aucat_open(struct aucat *hdl, const char *str, unsigned int mode) hdl->wmsg.u.hello.version = AMSG_VERSION; hdl->wmsg.u.hello.mode = htons(mode); hdl->wmsg.u.hello.devnum = devnum; + hdl->wmsg.u.hello.id = htonl(getpid()); strlcpy(hdl->wmsg.u.hello.who, __progname, sizeof(hdl->wmsg.u.hello.who)); strlcpy(hdl->wmsg.u.hello.opt, opt, |