Fcntl(3p) Perl Programmers Reference Guide Fcntl(3p)
Fcntl - load the C Fcntl.h defines
use Fcntl;
use Fcntl qw(:DEFAULT :flock);
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 dis-
tribution) and your native C compiler. This means that it
has a far more likely chance of getting the numbers right.
Only "#define" symbols get translated; you must still
correctly pack up your own arguments to pass as args for
locking functions, etc.
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 ":Fcom-
pat". For new applications the newer versions of these con-
stants 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_* constants
with sysopen().
See "seek" in perlfunc and "sysseek" in perlfunc about the
SEEK_* constants.
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Fcntl(3p) Perl Programmers Reference Guide Fcntl(3p)
See "stat" in perlfunc about the S_I* constants.
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