XSetScreenSaver(3X11) XLIB FUNCTIONS XSetScreenSaver(3X11)
NAME
XSetScreenSaver, XForceScreenSaver, XActivateScreenSaver, XResetScreenSaver, XGetScreenSaver - manipulate the screen saver
SYNTAX
int XSetScreenSaver(Display *display, int timeout, int interval, int prefer_blanking, int allow_exposures);
int XForceScreenSaver(Display *display, int mode);
int XActivateScreenSaver(Display *display);
int XResetScreenSaver(Display *display);
int XGetScreenSaver(Display *display, int *timeout_return, int *interval_return, int *prefer_blanking_return, int *allow_exposures_return);
ARGUMENTS
allow_exposures
Specifies the screen save control values. You can pass DontAllowExposures, AllowExposures, or DefaultExposures.
allow_exposures_return
Returns the current screen save control value (DontAllowExposures, AllowExposures, or DefaultExposures).
display Specifies the connection to the X server.
interval Specifies the interval, in seconds, between screen saver alterations.
interval_return
Returns the interval between screen saver invocations.
mode Specifies the mode that is to be applied. You can pass ScreenSaverActive or ScreenSaverReset.
prefer_blanking
Specifies how to enable screen blanking. You can pass DontPreferBlanking, PreferBlanking, or DefaultBlanking.
prefer_blanking_return
Returns the current screen blanking preference (DontPreferBlanking, PreferBlanking, or DefaultBlanking).
timeout Specifies the timeout, in seconds, until the screen saver turns on.
timeout_return
Returns the timeout, in seconds, until the screen saver turns on.
DESCRIPTION
Timeout and interval are specified in seconds. A timeout of 0 disables the screen saver (but an activated screen saver is not deacti-
vated), and a timeout of -1 restores the default. Other negative values generate a BadValue error. If the timeout value is nonzero,
XSetScreenSaver enables the screen saver. An interval of 0 disables the random-pattern motion. If no input from devices (keyboard, mouse,
and so on) is generated for the specified number of timeout seconds once the screen saver is enabled, the screen saver is activated.
For each screen, if blanking is preferred and the hardware supports video blanking, the screen simply goes blank. Otherwise, if either
exposures are allowed or the screen can be regenerated without sending Expose events to clients, the screen is tiled with the root window
background tile randomly re-origined each interval seconds. Otherwise, the screens' state do not change, and the screen saver is not acti-
vated. The screen saver is deactivated, and all screen states are restored at the next keyboard or pointer input or at the next call to
XForceScreenSaver with mode ScreenSaverReset.
If the server-dependent screen saver method supports periodic change, the interval argument serves as a hint about how long the change
period should be, and zero hints that no periodic change should be made. Examples of ways to change the screen include scrambling the col-
ormap periodically, moving an icon image around the screen periodically, or tiling the screen with the root window background tile, ran-
domly re-origined periodically.
XSetScreenSaver can generate a BadValue error.
If the specified mode is ScreenSaverActive and the screen saver currently is deactivated, XForceScreenSaver activates the screen saver even
if the screen saver had been disabled with a timeout of zero. If the specified mode is ScreenSaverReset and the screen saver currently is
enabled, XForceScreenSaver deactivates the screen saver if it was activated, and the activation timer is reset to its initial state (as if
device input had been received).
XForceScreenSaver can generate a BadValue error.
The XActivateScreenSaver function activates the screen saver.
The XResetScreenSaver function resets the screen saver.
The XGetScreenSaver function gets the current screen saver values.
DIAGNOSTICS
BadValue Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argu-
ment, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this
error.
SEE ALSO
Xlib - C Language X Interface
XFree86 Version 4.7.0 XSetScreenSaver(3X11)