diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/open.pm | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/open.pm b/lib/open.pm index c2940931b7..39e194fd19 100644 --- a/lib/open.pm +++ b/lib/open.pm @@ -166,9 +166,12 @@ Perl is configured to use PerlIO as its IO system (which is now the default). The C<open> pragma serves as one of the interfaces to declare default -"layers" (also known as "disciplines") for all I/O. Any open(), -readpipe() (aka qx//) and similar operators found within the lexical -scope of this pragma will use the declared defaults. +"layers" (also known as "disciplines") for all I/O. Any two-argument +open(), readpipe() (aka qx//) and similar operators found within the +lexical scope of this pragma will use the declared defaults. +Three-argument opens are not affected by this pragma since there you +(can) explicitly specify the layers and are supposed to know what you +are doing. With the C<IN> subpragma you can declare the default layers of input streams, and with the C<OUT> subpragma you can declare |