[sane-devel] Signal-Handling-Question ( OS/2)
Franz Bakan" <firstname.lastname@example.org
Fri, 21 Nov 2003 01:43:19 +0100 (CET)
Perhaps someone can help me with this:
When I try to stop a scan with scanimage using Ctrl+C on
OS/2 the System crashes ( TRAP D). This is probably
a fault of the driver used for SCSI-access.
I can work around this problem by encapsulating all DosDevIOCtl()
functions in a DosEnterMustComplete() DosExitMustComplete() pair.
But this 'solution' is not perfect. When I now 'Ctrl+C' the scanner stops,
the error-LED on the scanner (EPSON GT-9500) lights up and
scanimage.exe: received signal 2
scanimage.exe: trying to stop scanner
and _wait's_ until I SIGKILL the process (second Ctrl+C doesn't work).
- How to tell scanimage that the scanner allready has stopped?
- How do I reset the scanner so that the error-led turns off again?
(OK I can use the RESET-button of my EPSON-Scanner, but other
scanners probably don't have a RESET-Button)
Probably some atexit() function but where and how to place it,
scanimage allready has one?
In a second approach I've tried the following:
/* Prevent the calling process from being killed */
sigprocmask(SIG_BLOCK, &all, &oldset);
/* Now it is ok to be killed */
sigprocmask(SIG_SETMASK, &oldset, NULL);
But this way the machine still crashes hard when entering Ctrl+C
(Perhaps I made a mistake with the syntax?)
- How do I correctly delay SIG_INT with unix-like functions?
Hoping for some enlightenment,