snd_ctl_sync_vmaster(9) centos man page | unix.com

SND_CTL_SYNC_VMASTER(9) 					 Control/Mixer API					   SND_CTL_SYNC_VMASTER(9)

NAME
       snd_ctl_sync_vmaster - Sync the vmaster slaves and hook

SYNOPSIS
       void snd_ctl_sync_vmaster(struct snd_kcontrol * kcontrol, bool hook_only);

ARGUMENTS
       kcontrol
	   vmaster kctl element

       hook_only
	   sync only the hook

DESCRIPTION
       Forcibly call the put callback of each slave and call the hook function to synchronize with the current value of the given vmaster element.
       NOP when NULL is passed to kcontrol.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SND_CTL_SYNC_VMASTER(9)