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Full Discussion: Perl alarm signal
Top Forums Shell Programming and Scripting Perl alarm signal Post 95668 by reggiej on Friday 13th of January 2006 12:25:13 PM
Old 01-13-2006
Perl alarm signal
I am trying to write a signal to exit when a process times out. What I have come up with from poking around the web is this.

#!/usr/bin/perl

eval {
local $SIG{ALRM} = sub { die "alarm clock restart" };
alarm 10;

open(DSMADMC, "dsmadmc -se=tsmpc1 -id=XXXXX -pass=XXXXX -commadelimited
<<EOF
select * from summary where schedule_name=\'WEEKLY_ARCHIVE_11PM\' |") or
die "exec: $!\n";
EOF
;
alarm 0;
};
if ($@ and $@ !~ /alarm clock restart/) { die }

while ($line=<DSMADMC>) {
chomp($line);
print ("$line\n");
} #end while

What I am trying to do is that whenver

open(DSMADMC, "dsmadmc -se=tsmpc1 -id=XXXXX -pass=XXXXX -commadelimited
<<EOF
select * from summary where schedule_name=\'WEEKLY_ARCHIVE_11PM\' |") or
die "exec: $!\n";
EOF
;
times out the exit occurs. So far when I set the alarm to 0 to test nothing happens. Can someone set me straight as to what I need to do?
 

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LEARN ABOUT MOJAVE

alarm

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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