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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).

     For ease of use also the SEEK_* constants (for seek() and
     sysseek(), e.g. SEEK_END) and the S_I* constants (for
     chmod() and stat()) are available for import.  They can be
     imported either separately or using the tags `:seek' and
     `:mode'.

     Please refer to your native fcntl(2), open(2), fseek(3),
     lseek(2) (equal to Perl's seek() and sysseek(),
     respectively), and chmod(2) documentation to see what
     constants are implemented in your system.

     See the perlopentut manpage to learn about the uses of the
     O_* constants with sysopen().


     See the seek entry in the perlfunc manpage and the sysseek
     entry in the perlfunc manpage about the SEEK_* constants.

     See the stat entry in the perlfunc manpage about the S_I*
     constants.









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Created 1996-2024 by Maxim Chirkov

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