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Top Forums UNIX for Dummies Questions & Answers starting processes with timeout? Post 302072791 by Perderabo on Sunday 7th of May 2006 11:58:44 AM
Old 05-07-2006
This is an odd thing to do. But I just got this script to work:
Code:
#! /usr/bin/ksh

sleep 200 ; kill -term -$$ &
sleep 7
kill -term -$$

One of my sleep processes represents a process that might run too long. The other sleep process is the timer. Either process could play either role, but I envisioned that first line as the timer and the second as the process to be timed. One of the processes will probably finish first and then run the "kill -term -$$". This will kill the process group. On a multiprocessor system simultaneous kills may occur, but the kernel will ensure that they happen serially. There is no race condition here. This depends on the shell putting all processes in a script into a single process group. So neither sleep process could be replaced with another shell script because it would become a new process group.
 

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kill(1) 						      General Commands Manual							   kill(1)

Name
       kill - send a signal to a process

Syntax
       kill [-sig] processid...
       kill -l

Description
       The command sends the TERM (terminate, 15) signal to the specified processes.  If a signal name or number preceded by `-' is given as first
       argument, that signal is sent instead of terminate.  For further information, see

       The terminate signal kills processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot  be  caught.
       By convention, if process number 0 is specified, all members in the process group (that is, processes resulting from the current login) are
       signaled.  This works only if you use and not if you use To kill a process it must either belong to you or you must be superuser.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be  found  by  using	It
       allows job specifiers ``%...''  so process ID's are not as often used as arguments.  See for details.

Options
       -l   Lists  signal  names.  The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG
	    prefix.

See Also
       csh(1), ps(1), kill(2), sigvec(2)

																	   kill(1)
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