[cups.development] how can I pause/resume printer using cups

[Michael Sweet]

If you want to stop the printer from your filter, use:

    fputs("STATE: paused\n", stderr);

Note that this will immediately cause your filter to be killed (SIGTERM) and the queue will be stopped, which is probably *not* what you want.

Your filter or backend can set another STATE: value and then wait for notification (via some external IPC mechanism with the user session), effectively pausing the current job.  For example:

    fputs("STATE: +com.vendor-authentication\n", stderr);
    ... send a notification to a user-space daemon/agent and wait for a response ...
    fputs("STATE: -com.vendor-authentication\n", stderr);

How you communicate with the user session is entirely operating system specific - on Mac OS X use Launch Agents:

    http://developer.apple.com/mac/library/technotes/tn2005/tn2083.html

On Linux you'd probably use DBUS.

On Jan 28, 2010, at 5:17 AM, akbar wrote:

> Hi every one,
> 
> I need to pause the printer for the current job and resume the printer after authorization.can any body give some sample code for this.
> 
> please help me.
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___________________________________________________
Michael Sweet, Senior Printing System Engineer