print STDIN "abc" ;
Filehandle %s opened only for output [pp_print]
- print <STDOUT> ;
+ $a = <STDOUT> ;
print() on closed filehandle %s [pp_print]
close STDIN ; print STDIN "abc" ;
########
# pp_hot.c [pp_print]
use warnings 'io' ;
-print STDIN "anc";
-print <STDOUT>;
-print <STDERR>;
-open(FOO, ">&STDOUT") and print <FOO>;
-print getc(STDERR);
-print getc(FOO);
-####################################################################
-# The next test is known to fail on some systems (Linux+old glibc, #
-# some *BSDs (including Mac OS X and NeXT), among others. #
-# We skip it for now (on the grounds that it is "just" a warning). #
-####################################################################
-#read(FOO,$_,1);
+# There is no guarantee that STDOUT is output only, or STDIN input only.
+# Certainly on some BSDs (at least FreeBSD, Darwin, BSDi) file descriptors
+# 1 and 2 are opened read/write on the tty, and the IO layers may reflect this.
+# So we must make our own file handle that is read only.
+my $file = "./xcv" ; unlink $file ;
+open (FH, ">$file") or die $! ;
+close FH or die $! ;
+die "There is no file $file" unless -f $file ;
+open (FH, "<$file") or die $! ;
+print FH "anc" ;
+open(FOO, "<&FH") or die $! ;
+print FOO "anc" ;
no warnings 'io' ;
-print STDIN "anc";
+print FH "anc" ;
+print FOO "anc" ;
+use warnings 'io' ;
+print FH "anc" ;
+print FOO "anc" ;
+close (FH) or die $! ;
+close (FOO) or die $! ;
+unlink $file ;
EXPECT
-Filehandle STDIN opened only for input at - line 3.
-Filehandle STDOUT opened only for output at - line 4.
-Filehandle STDERR opened only for output at - line 5.
-Filehandle FOO opened only for output at - line 6.
-Filehandle STDERR opened only for output at - line 7.
-Filehandle FOO opened only for output at - line 8.
+Filehandle FH opened only for input at - line 12.
+Filehandle FOO opened only for input at - line 14.
+Filehandle FH opened only for input at - line 19.
+Filehandle FOO opened only for input at - line 20.
########
# pp_hot.c [pp_print]
use warnings 'closed' ;
# pp_hot.c [Perl_do_readline]
use warnings 'io' ;
my $file = "./xcv" ; unlink $file ;
-open (FH, ">./xcv") ;
+open (FH, ">$file") or die $! ;
my $a = <FH> ;
no warnings 'io' ;
$a = <FH> ;
-close (FH) ;
+use warnings 'io' ;
+open(FOO, ">&FH") or die $! ;
+$a = <FOO> ;
+no warnings 'io' ;
+$a = <FOO> ;
+use warnings 'io' ;
+$a = <FOO> ;
+$a = <FH> ;
+close (FH) or die $! ;
+close (FOO) or die $! ;
unlink $file ;
EXPECT
Filehandle FH opened only for output at - line 5.
+Filehandle FOO opened only for output at - line 10.
+Filehandle FOO opened only for output at - line 14.
+Filehandle FH opened only for output at - line 15.
########
# pp_hot.c [Perl_sub_crush_depth]
use warnings 'recursion' ;