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Full Discussion: kill signal
Top Forums UNIX for Advanced & Expert Users kill signal Post 59434 by Perderabo on Monday 20th of December 2004 10:10:13 AM
Old 12-20-2004
Since its USR1 it can't be generated directly by the kernal as the result of a malfunction by the signaled process. Somewhere there must be a signaling process. The default action for USR1 is to just die. If an error file is being generated, your mq process must be catching the signal. So writing a quick wrapper to ignore the signal is out. If the mq process is running as the user "joe", only joe and root can signal it. That limits down the suspects. If you can predict when it happens, run a ps -ef just before. Also look for cron and at jobs belonging to joe and to root.

It is possible that signal comes from the process itself. A process can use raise() or the equivalent to signal itself. This may mean that mq is breaking somehow at that time because it is regularly being asked to somwthing that it can't.
 

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pause(2)							   System Calls 							  pause(2)

NAME
pause - suspend process until signal SYNOPSIS
#include <unistd.h> int pause(void); DESCRIPTION
The pause() function suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored by the calling process. If the signal causes termination of the calling process, pause() does not return. If the signal is caught by the calling process and control is returned from the signal-catching function (see signal(3C)), the calling process resumes execution from the point of suspension. RETURN VALUES
Since pause() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completion return value. If interrupted, it returns -1 and sets errno to indicate the error. ERRORS
The pause() function will fail if: EINTR A signal is caught by the calling process and control is returned from the signal-catching function. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
alarm(2), kill(2), signal(3C), wait(3C), attributes(5), standards(5) SunOS 5.11 28 Dec 1996 pause(2)
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