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From: | |
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Date: | Fri, 6 Mar 1998 17:11:33 +0100 |
Content-Type: | text/plain |
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Dear list participant
What can I do when this script reports the following error.
shell/iX>/PERL/PUB/src/perl5.004_04-mpe/eg/sysvipc/ipcsem s
Can't get semaphore: No such file or directory
shell/iX>
shell/iX> cat /PERL/PUB/src/perl5.004_04-mpe/eg/sysvipc/ipcsem
#!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if $running_under_some_shell;
require 'sys/ipc.ph';
require 'sys/msg.ph';
require 'sys/sem.ph';
$| = 1;
$mode = shift;
die "usage: ipcmsg {r|s}\n" unless $mode =~ /^[rs]$/;
$signal = ($mode eq "s");
$id = semget(0x1234, 1, ($signal ? 0 : &IPC_CREAT) | 0644);
die "Can't get semaphore: $!\n" unless defined($id);
print "semaphore id: $id\n";
if ($signal) {
while (<STDIN>) {
print "Signalling\n";
unless (semop($id, pack("sss", 0, 1, 0))) {
die "Can't signal semaphore: $!\n";
}
}
}
else {
$SIG{'INT'} = $SIG{'QUIT'} = "leave";
for (;;) {
unless (semop($id, pack("sss", 0, -1, 0))) {
die "Can't wait for semaphore: $!\n";
}
print "Unblocked\n";
}
}
&leave;
sub leave {
if (!$signal) {
$x = semctl($id, 0, &IPC_RMID, 0);
if (!defined($x) || $x < 0) {
die "Can't remove semaphore: $!\n";
}
}
exit;
}
Any help will be appreciated.
Thanks
Raymond Roesch
mailto:[log in to unmask]
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