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Fcntl(3pm)                            Perl Programmers Reference Guide                            Fcntl(3pm)



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 fcntl.h file.  Unlike the old mechanism of requiring a
       translated fcntl.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 Exporter.

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

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

       See "stat" in perlfunc about the S_I* constants.



perl v5.16.2                                     2012-10-11                                       Fcntl(3pm)