fcntl(3)

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 cor
rectly 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(), respec tively), and chmod(2) documentation to see what constants
are implemented in your system.

See perlopentut to learn about the uses of the O_* con
stants with sysopen().

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

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