Source Output Post: 302713991

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Top Forums UNIX for Advanced & Expert Users Source Output Post 302713991 by bakunin on Thursday 11th of October 2012 01:48:41 PM

10-11-2012

Registered User

Quote:

Originally Posted by Don Cragun

Obviously, the commands specified by the action in a trap action EXIT command won't be executed if the shell is terminated by a SIGKILL signal since the shell can't catch a SIGKILL to invoke the actions specified by appropriate traps.

True. This notable exception i have explicitly stated (in post #4, last line). It is because of the nature of this signal, which is not directed at the process but rather at the kernel. A process terminated by SIGKILL doesn't terminate itself, but rather is terminated by the kernel.

Quote:

If the standard is interpreted as you expect, then no system conforms to the standard because the standard doesn't allow an exception for being terminated by SIGKILL.

Actually what i tried to get across was: save for SIGKILL, any other way of terminating a script (simple end, send a SIGTERM via "kill -15", press "CTRL-C", ...) will result in trap 0 (EXIT) being executed - not just using the "exit" built-in.

This is in fact as it should be because a script terminated by "kill -9" probably best leaves its temporary files for further inspection (one wouldn't terminate a script this way without some serious reason) and all other methods of ending a script are covered.

Thanks for sharing your thoughts.

bakunin

bakunin

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killall

killall(8)						      System Manager's Manual							killall(8)

NAME

       killall - Terminates all processes started by the user, except the calling process

SYNOPSIS

       /usr/sbin/killall [- | [-]signal_name | -signal_number]

       /usr/sbin/killall -l

FLAGS

       The  hyphen  character (without an argument) sends a SIGTERM signal initially and then sends a SIGKILL signal to all processes that survive
       for 30 seconds after receipt of the first signal.  This gives processes that catch the SIGTERM signal an opportunity to clean up.  A signal
       name, optionally preceded by a hyphen, sends the specified signal to processes.	The hyphen character (with a signal number argument) sends
       the specified signal, either a name, stripped of the SIG prefix (such as KILL), or a number (such as  9).   For	information  about  signal
       names and numbers, see the signal() system call.

       In  the System V habitat, the optional signal number does not have to be preceded with a hyphen (-).  Lists signal names in numerical order
       (as given in the /usr/include/signal.h file), stripped of the common SIG prefix.

DESCRIPTION

       This command provides a convenient means of killing all processes created by the shell that you control.  When started  by  the	superuser,
       the killall command kills all processes that can be terminated, except those processes that started it, the kernel processes, and processes
       0 and 1 (init).

   Security Configuration
       This command is modified in all security configurations of the system.

EXAMPLES

       To stop all background processes that have started, enter: killall This sends all background processes signal  9  (the  kill  signal,  also
       called  SIGKILL).   To  stop  all  background processes, giving them a chance to clean up, enter: killall - This sends signal 15 (SIGTERM),
       waits 30 seconds, and then sends signal 9 (SIGKILL).  To send a specific signal to the background processes, enter: killall -2  This  sends
       signal  2 (SIGINT) to the background processes.	To list the signal names in numerical order, stripped of the SIG prefix, enter: killall -l
       This displays a list of signals, which may vary from system to system.

FILES

       Specifies the command path

RELATED INFORMATION

       Calls: kill(2), sigaction(2), signal(2) delim off

																	killall(8)