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| author | Steve Grazzini <grazz@pobox.com> | 2003-06-18 15:42:37 -0400 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 2003-06-19 14:08:13 +0000 |
| commit | 7ff032551aa263179d4cb6df3dd91502d713e6ba (patch) | |
| tree | 7dd25bf874fe4d2842d7e56fa2b9da375cf60df3 /pod/perltie.pod | |
| parent | ca9279baf07d6843f58a31f1ce3ff7dc875faf1a (diff) | |
| download | perl-7ff032551aa263179d4cb6df3dd91502d713e6ba.tar.gz | |
Re: [perl #17934] tied STDERR and internal warnings
Message-ID: <20030618234237.GA6267@grazzini.net>
p4raw-id: //depot/perl@19819
Diffstat (limited to 'pod/perltie.pod')
| -rw-r--r-- | pod/perltie.pod | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/pod/perltie.pod b/pod/perltie.pod index 3665f0420e..8f3a6774ae 100644 --- a/pod/perltie.pod +++ b/pod/perltie.pod @@ -794,9 +794,16 @@ READ, and possibly CLOSE, UNTIE and DESTROY. The class can also provide: BINMOD OPEN, EOF, FILENO, SEEK, TELL - if the corresponding perl operators are used on the handle. -It is especially useful when perl is embedded in some other program, -where output to STDOUT and STDERR may have to be redirected in some -special way. See nvi and the Apache module for examples. +When STDERR is tied, its PRINT method will be called to issue warnings +and error messages. This feature is temporarily disabled during the call, +which means you can use C<warn()> inside PRINT without starting a recursive +loop. And just like C<__WARN__> and C<__DIE__> handlers, STDERR's PRINT +method may be called to report parser errors, so the caveats mentioned under +L<perlvar/%SIG> apply. + +All of this is especially useful when perl is embedded in some other +program, where output to STDOUT and STDERR may have to be redirected +in some special way. See nvi and the Apache module for examples. In our example we're going to create a shouting handle. |