extproc C:\binp\misc\perl.exe -S#!perl# os2.pl:  Demonstrates the OS/2 system calls and shows off some of the# features in common with the UNIX version.do "syscalls.pl" || die "Cannot load syscalls.pl ($!)";# OS/2 version number.	$version = "  "; syscall($OS2_GetVersion,$version); 	($minor, $major) = unpack("CC", $version);	print "You are using OS/2 version ", int($major/10), 			".", int($minor/10), "\n\n"; # Process ID.	print "This process ID is $$ and its parent's ID is ", 		getppid(), "\n\n";# Priority.	printf "Current priority is %x\n", getpriority(0,0);	print "Changing priority by +5\n";	print "Failed!\n" unless setpriority(0,0,+5);	printf "Priority is now %x\n\n", getpriority(0,0);# Beep.	print "Here is an A440.\n\n";	syscall($OS2_Beep,440,50);# Pipes.  Unlike MS-DOS, OS/2 supports true asynchronous pipes.	open(ROT13, '|perl -pe y/a-zA-Z/n-za-mN-ZA-M/') || die;	select(ROT13); $|=1; select(STDOUT);	print "Type two lines of stuff, and I'll ROT13 it while you wait.\n".	      "If you type fast, you might be able to type both of your\n".	      "lines before I get a chance to translate the first line.\n";	$_ = <STDIN>; print ROT13 $_;	$_ = <STDIN>; print ROT13 $_;	close(ROT13);	print "Thanks.\n\n";# Inspecting the disks.	print "Let's look at the disks you have installed...\n\n";	$x = "\0\0";	syscall($OS2_Config, $x, 2);	print "You have ", unpack("S", $x), " floppy disks,\n";	$x = "  ";	syscall($OS2_PhysicalDisk, 1, $x, 2, 0, 0);	($numdisks) = unpack("S", $x);	print "and $numdisks partitionable disks.\n\n";	for ($i = 1; $i <= $numdisks; $i++) {		$disk = $i . ":";		$handle = "  ";		syscall($OS2_PhysicalDisk, 2, $handle, 2, $disk, 3);		($numhandle) = unpack("S", $handle);		$zero = pack("C", 0);		$parmblock = " " x 16;		syscall($OS2_IOCtl, $parmblock, $zero, 0x63, 9, $numhandle);		($x, $cylinders, $heads, $sect) = unpack("SSSS", $parmblock);		print "Hard drive #$i:\n";		print "   cylinders: $cylinders\n";		print "       heads: $heads\n";		print "    sect/trk: $sect\n";		syscall($OS2_PhysicalDisk, 3, 0, 0, $handle, 2);	}# I won't bother with the other stuff.  You get the idea.