Fcntl

Section: Perl Programmers Reference Guide (3)
Updated: perl 5.004, patch 55
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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.ph file, 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 correctly pack 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 and O_CREAT) and the FD_CLOEXEC constant are exported into your namespace.

You can request that the flock() constants (LOCK_SH, LOCK_EX, LOCK_NB and 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 for compatibility reasons by using the tag :Fcompat. For new applications 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 see what constants are implemented in your system.


 

Index

NAME
SYNOPSIS
DESCRIPTION
NOTE
EXPORTED SYMBOLS

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Time: 23:58:15 GMT, February 15, 2023