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Full Discussion: Problem with handling SIGINT
Top Forums Programming Problem with handling SIGINT Post 302170157 by JamesGoh on Sunday 24th of February 2008 06:24:14 PM
Old 02-24-2008
Problem with handling SIGINT
For a program I am designing, which involves handling the keyboard input Ctrl^c (SIGINT), it is taking ages for the program to actually recognise and perform the corresponding action whenever I run it and hit Ctrl^C at the CL. I have to do at least 3 Ctrl^Cs before the program will actually register and handle SIGINT appropriately.

Currently Im using signal() to map the various types of unix signals (i.e SIGINT, SIGSTSP) to handler functions I have defined in my program. What the handler functions do is call exit(0) (which quits the program) whenever the corresponding signal has been received by the program. As I mentioned before, it is taking several Ctrl^Cs to get the handler functions to be invoked, when it should just be 1 Ctrl^C.

Im unsure what could be causing my problem. Please feel free to make any suggestions.
 

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LEARN ABOUT LINUX

ctrlaltdel

CTRLALTDEL(8)						     Linux Programmer's Manual						     CTRLALTDEL(8)

NAME

       ctrlaltdel - set the function of the Ctrl-Alt-Del combination

SYNOPSIS

       ctrlaltdel hard|soft

DESCRIPTION

       Based  on examination of the linux/kernel/sys.c code, it is clear that there are two supported functions that the Ctrl-Alt-Del sequence can
       perform: a hard reset, which immediately reboots the computer without calling sync(2) and without any other preparation; and a soft  reset,
       which sends the SIGINT (interrupt) signal to the init process (this is always the process with PID 1).  If this option is used, the init(8)
       program must support this feature.  Since there are now several init(8) programs in the Linux community, please consult	the  documentation
       for the version that you are currently using.

       ctrlaltdel is usually used in the /etc/rc.local file.

FILES

       /etc/rc.local

SEE ALSO

       simpleinit(8), init(8)

AUTHOR

       Peter Orbaek (poe@daimi.aau.dk)

AVAILABILITY

       The ctrlaltdel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

Linux 1.2							  25 October 1993						     CTRLALTDEL(8)
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