diff options
Diffstat (limited to 'lib/libsndio')
| -rw-r--r-- | lib/libsndio/sioctl_open.3 | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/lib/libsndio/sioctl_open.3 b/lib/libsndio/sioctl_open.3 index f4edb55929e..b1204552e01 100644 --- a/lib/libsndio/sioctl_open.3 +++ b/lib/libsndio/sioctl_open.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sioctl_open.3,v 1.7 2020/06/18 14:49:46 schwarze Exp $ +.\" $OpenBSD: sioctl_open.3,v 1.8 2020/06/18 16:21:28 schwarze Exp $ .\" .\" Copyright (c) 2011-2020 Alexandre Ratchov <alex@caoua.org> .\" @@ -82,8 +82,7 @@ Each control has an integer .Em address and an integer .Em value . -Depending on the control type, its integer value represents either a -continuous quantity or a boolean. +Some values are boolean and can only be switched to either 0 (off) or 1 (on). Any control may be changed by submitting a new value to its address. When values change, asynchronous notifications are sent. @@ -156,7 +155,7 @@ struct sioctl_desc { unsigned int addr; /* control address */ #define SIOCTL_NONE 0 /* deleted */ #define SIOCTL_NUM 2 /* integer in the maxval range */ -#define SIOCTL_SW 3 /* on/off switch (0 or 1) */ +#define SIOCTL_SW 3 /* on/off switch (1 or 0) */ #define SIOCTL_VEC 4 /* number, element of vector */ #define SIOCTL_LIST 5 /* switch, element of a list */ unsigned int type; /* one of above */ @@ -182,19 +181,19 @@ Possible types are: .It Dv SIOCTL_NONE A previously valid control was deleted. .It Dv SIOCTL_NUM -A continuous control in the range from 0 to +An integer control in the range from 0 to .Fa maxval , inclusive. For instance the volume of the speaker. .It Dv SIOCTL_SW -A on/off switch control. +A boolean control. For instance the switch to mute the speaker. .It Dv SIOCTL_VEC -Element of an array of continuous controls. +Element of an array of integer controls. For instance the knob to control the amount of signal flowing from the line input to the speaker. .It Dv SIOCTL_LIST -An element of an array of on/off switches. +An element of an array of boolean switches. For instance the line-in position of the speaker source selector. .El @@ -238,7 +237,7 @@ The .Fn sioctl_onval function can be used to register a call-back which will be invoked whenever a control changes. -Continuous values are in the range from 0 to +Integer values are in the range from 0 to .Fa maxval . .Ss Interface to poll(2) The |