[svn:perlfaq] r5942 - perlfaq/trunk

Author: robert
Date: Wed Apr 19 22:59:48 2006
New Revision: 5942

Modified:
   perlfaq/trunk/perlfaq8.pod

Log:
Change 27905 by stevep@stevep-mccoy on 2006/04/19 16:32:26

	Changes to perlfaq8 "How do I find out if I'm running interactively 
	or not?" suggested by Slaven Rezic in RT #38901: perlfaq8 correction

Affected files ...

... //depot/perl/pod/perlfaq8.pod#50 edit



Modified: perlfaq/trunk/perlfaq8.pod
==============================================================================
--- perlfaq/trunk/perlfaq8.pod	(original)
+++ perlfaq/trunk/perlfaq8.pod	Wed Apr 19 22:59:48 2006
@@ -1005,13 +1005,19 @@
 the current process group of your controlling terminal as follows:
 
     use POSIX qw/getpgrp tcgetpgrp/;
-    open(TTY, "/dev/tty") or die $!;
-    $tpgrp = tcgetpgrp(fileno(*TTY));
-    $pgrp = getpgrp();
-    if ($tpgrp == $pgrp) {
-        print "foreground\n";
+    
+    # Some POSIX systems, such as Linux, can be
+    # without a /dev/tty at boot time. 
+    if (!open(TTY, "/dev/tty")) {
+        print "no tty\n";
     } else {
-        print "background\n";
+        $tpgrp = tcgetpgrp(fileno(*TTY));
+        $pgrp = getpgrp();
+        if ($tpgrp == $pgrp) {
+            print "foreground\n";
+        } else {
+            print "background\n";
+        }
     }
 
 =head2 How do I timeout a slow event?