NAME

sv_acquire, sv_release − change owner, group, permissions of window devices

SYNOPSIS

sv_acquire [ startwin [ nwins [ nbackground ]]]

sv_release

DESCRIPTION

sv_acquire changes the owner, group and permissions of window system devices to the user ID, group ID, and the permissions specified in /etc/svdtab (see svdtab(5)), if there is an entry in that file.  If no entry exists in /etc/svdtab, no changes will be made. 

sv_release returns the owner, and group to root and wheel.  The permissions are set as specified in /etc/svdtab. 

startwin indicates the first win to change, nwins indicates the number of windows to change, nbackgound indicates the number of win devices to change in the backgound. 

This is a setuid root program spawned by the window system (for example, sunview(1)).  sv_acquire exits if the user does not own console devices listed in /etc/fbtab (see fbtab(5)).  sv_acquire exits with 0 on success and −1 on failure. 

EXAMPLES

In the following example, sv_acquire sets the user ID and the group ID of /dev/win0 through /dev/win15 in the foreground and spawns a background process to set /dev/win16 through /dev/win256 and exit with error status. 

sv_acquire 0 256 240

The purpose of spawning a background process is to allow the caller to avoid waiting for all win devices to be changed.  Note: a diskless 3/50 sets approximately 16 wins per second. 

SEE ALSO

sunview(1), fbtab(5), svdtab(5)

Sun Release 4.1  —  Last change: 25 January 1990