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";

}