This simple perl script was designed under FreeBSD, and, right now, is

limited to it. It provides a simple way of determining and directing

administrators in what has to be done to get IPC working, and configured.

Usage:

ipc_check.pl

- simply checks for semaphores and shared memory being enabled

- if one or other is not enabled, appropriate "options" are provided

to get it compiled into the kernel

ipc_check.pl -B <# of buffers>

- checks to see if there are sufficient shared memory buffers to

run the postmaster with a -B option as provided

- if insufficient buffers are provided, appropriate 'sysctl' commands,

and instructions, are provided to the administrator to increase

them

if(@ARGV > 1) {

if($ARGV[0] eq "-B") {

$buffers = $ARGV[1];

}

}

if($buffers > 0) {

$kb_memory_required = $buffers * 8;

}

$shm = `sysctl kern.ipc | grep shmall`;

( $junk, $shm_amt ) = split(/ /, $shm);

chomp($shm_amt);

$sem = `sysctl kern.ipc | grep semmap`;

print "\n\n";

if(length($shm) > 0) {

printf "shared memory enabled: %d kB available\n", $shm_amt * 4;

if($buffers > 0) {

if($kb_memory_required / 4 > $shm_amt) {

print "\n";

print "to provide enough shared memory for a \"-B $buffers\" setting\n";

print "issue the following command\n\n";

printf "\tsysctl -w kern.ipc.shmall=%d\n", $kb_memory_required / 4;

print "\nand add the following to your /etc/sysctl.conf file:\n\n";

printf "\tkern.ipc.shmall=%d\n", $kb_memory_required / 4;

} else {

print "\n";

print "no changes to kernel required for a \"-B $buffers\" setting\n";

}

}

} else {

print "no shared memory support available\n";

print "add the following option to your kernel config:\n\n";

print "\toptions SYSVSHM\n\n";

}

print "\n==========================\n\n";

if(length($sem) > 0) {

print "semaphores enabled\n";

} else {

print "no semaphore support available\n";

print "add the following option to your kernel config:\n\n";

print "\toptions SYSVSEM\n\n";

}