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Top Forums Shell Programming and Scripting Killing a program in shell script Post 302775289 by MadeInGermany on Monday 4th of March 2013 01:35:39 PM
Old 03-04-2013
You mean the shell script eventually hangs, because it runs an I/O command that eventually hangs?
Then, in the shell script, define a timeout function like this:
Code:
timeout () {
to=$1
shift
perl -e "alarm $to; exec @ARGV" "$@"
}

and run the critical I/O commands like this example
Code:
timeout 300 critical_command ... # kill if running >300 seconds

The call to perl is needed to install an alarm signal handler.
 

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ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME
alarm -- set signal timer alarm LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> unsigned alarm(unsigned seconds); DESCRIPTION
This interface is made obsolete by setitimer(2). The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds. If an alarm has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call. The request alarm(0) voids the current alarm and the signal SIGALRM will not be delivered. Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000. RETURN VALUES
The return value of alarm() is the amount of time left on the timer from a previous call to alarm(). If no alarm is currently set, the return value is 0. SEE ALSO
setitimer(2), sigaction(2), sigpause(2), sigvec(2), signal(3), sleep(3), ualarm(3), usleep(3) HISTORY
An alarm() function appeared in Version 7 AT&T UNIX. BSD
April 19, 1994 BSD
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