Change 27905: Changes to perlfaq8 "How do I find out if I'm running interactively

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

Differences ...

==== //depot/perl/pod/perlfaq8.pod#50 (text) ====
Index: perl/pod/perlfaq8.pod
--- perl/pod/perlfaq8.pod#49~27399~	2006-03-07 06:15:46.000000000 -0800
+++ perl/pod/perlfaq8.pod	2006-04-19 09:32:26.000000000 -0700
@@ -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?
End of Patch.