MAN page from Old RedHat 5.X perl-5.004-4.i386.rpm

Fcntl

Section: Perl Programmers Reference Guide (3)
Updated: perl 5.004, patch 04
Index

NAME

Fcntl - load the C Fcntl.h defines

SYNOPSIS

    use Fcntl;    use Fcntl qw(:DEFAULT :flock);

DESCRIPTION

This module is just a translation of the C fnctl.h file.Unlike the old mechanism of requiring a translated fnctl.phfile, this uses the h2xs program (see the Perl source distribution)and your native C compiler. This means that it has a far more likely chance of getting the numbers right.

NOTE

Only #define symbols get translated; you must still correctlypack up your own arguments to pass as args for locking functions, etc.

EXPORTED SYMBOLS

By default your system's F_* and O_* constants (eg, F_DUPFD andO_CREAT) and the FD_CLOEXEC constant are exported into your namespace.

You can request that the flock() constants (LOCK_SH, LOCK_EX, LOCK_NBand LOCK_UN) be provided by using the tag :flock. See the Exporter manpage.

You can request that the old constants (FAPPEND, FASYNC, FCREAT,FDEFER, FEXCL, FNDELAY, FNONBLOCK, FSYNC, FTRUNC) be provided forcompatibility reasons by using the tag :Fcompat. For newapplications the newer versions of these constants are suggested(O_APPEND, O_ASYNC, O_CREAT, O_DEFER, O_EXCL, O_NDELAY, O_NONBLOCK,O_SYNC, O_TRUNC).

Please refer to your native fcntl() and open() documentation to seewhat constants are implemented in your system.

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