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(3) Library Functions Manual pause(3)
NAME
pause - Suspends a process until it receives a signal
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <unistd.h>
int pause( void );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
pause(): POSIX.1, XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
DESCRIPTION
The pause() function suspends the calling process until it receives a signal whose action is either to execute a signal-catching function
or terminate the process. The signal must be one that is acknowledged by the calling process. The pause() function does not affect the
action taken when a signal is received.
The pause() function suspends the calling process by suspending the calling thread. Other threads in the process, if any, are not sus-
pended.
RETURN VALUES
When the received signal causes the calling process to terminate, the pause() function does not return.
When the signal is caught by the calling process and control is returned from the signal-catching function, the calling thread resumes exe-
cution from the point of suspension. At that point, the pause() function returns a value of -1 and sets errno to indicate the error.
ERRORS
The pause() function sets errno to the specified values for the following conditions: The signal has been caught by the calling process and
control has been returned from the signal-catching function.
RELATED INFORMATION
Functions: kill(2), sigaction(2), sigvec(2), wait(2)
Routines: alarm(3)
Standards: standards(5) delim off
pause(3)