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Top Forums UNIX for Advanced & Expert Users Not able to Display the Catched Signal Post 302691511 by DGPickett on Friday 24th of August 2012 04:47:45 PM
Old 08-24-2012
It is wise to log debug stuff to stderr, which by default is completely unbuffered. Just change 'printf(' to 'fprintf( stderr,'.

If speed is a focus, don't write bulk to unbuffered or line buffered FILE*'s like stderr, use a well buffered one, see man setvbuf(), some multiple of the disk page or packet size size like 65536 or 57600, less than the system write buffer or socket send buffer size, and fflush() only if necessary.

Calling exit() almost always flushes FILE*'s free of charge, but I had a primitive C compiler once that didn't.

---------- Post updated at 04:47 PM ---------- Previous update was at 04:46 PM ----------

You can use a tool like strace/truss/tusc to trace system calls and signals of the running process to a log file, and see what signals are doing what to your process.
 

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KILL(1) 						    BSD General Commands Manual 						   KILL(1)

NAME
kill -- terminate or signal a process SYNOPSIS
kill [-s signal_name] pid ... kill -l [exit_status] kill -signal_name pid ... kill -signal_number pid ... DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operand(s). Only the super-user may send signals to other users' processes. The options are as follows: -s signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -l [exit_status] If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status. -signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -signal_number A non-negative decimal integer, specifying the signal to be sent instead of the default TERM. The following pids have special meanings: -1 If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user. Some of the more commonly used signals: 1 HUP (hang up) 2 INT (interrupt) 3 QUIT (quit) 6 ABRT (abort) 9 KILL (non-catchable, non-ignorable kill) 14 ALRM (alarm clock) 15 TERM (software termination signal) Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page. SEE ALSO
builtin(1), csh(1), killall(1), ps(1), kill(2), sigaction(2) STANDARDS
The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A kill command appeared in Version 6 AT&T UNIX. BUGS
A replacement for the command ``kill 0'' for csh(1) users should be provided. BSD
April 28, 1995 BSD
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