perlipc.pod: mkfifo()

Message-ID: <20050611122656.GC8181@solemn.turbinal.org>

p4raw-id: //depot/perl@24807

diff --git a/pod/perlipc.pod b/pod/perlipc.pod
index efae687..671da85 100644 (file)
--- a/pod/perlipc.pod
+++ b/pod/perlipc.pod
@@ -246,7 +246,12 @@ mechanism for processes communicating on the same machine.  It works
 just like a regular, connected anonymous pipes, except that the
 processes rendezvous using a filename and don't have to be related.
 
-To create a named pipe, use the Unix command mknod(1) or on some
+To create a named pipe, use the C<POSIX::mkfifo()> function.
+
+    use POSIX qw(mkfifo);
+    mkfifo($path, 0700) or die "mkfifo $path failed: $!";
+
+You can also use the Unix command mknod(1) or on some
 systems, mkfifo(1).  These may not be in your normal path.
 
     # system return val is backwards, so && not ||
@@ -272,13 +277,13 @@ to find out whether anyone (or anything) has accidentally removed our fifo.
 
     chdir; # go home
     $FIFO = '.signature';
-    $ENV{PATH} .= ":/etc:/usr/games";
 
     while (1) {
        unless (-p $FIFO) {
            unlink $FIFO;
-           system('mknod', $FIFO, 'p')
-               && die "can't mknod $FIFO: $!";
+           require POSIX;
+           POSIX::mkfifo($FIFO, 0700)
+               or die "can't mkfifo $FIFO: $!";
        }
 
        # next line blocks until there's a reader