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.

perldoc2tree.cgi: /usr/lib/perl5/5.8.8/i386-linux-thread-multi/Fcntl.pm: cannot resolve L in paragraph 12.

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.

perldoc2tree.cgi: /usr/lib/perl5/5.8.8/i386-linux-thread-multi/Fcntl.pm: cannot resolve L in paragraph 16.

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

perldoc2tree.cgi: /usr/lib/perl5/5.8.8/i386-linux-thread-multi/Fcntl.pm: cannot resolve L in paragraph 17. perldoc2tree.cgi: /usr/lib/perl5/5.8.8/i386-linux-thread-multi/Fcntl.pm: cannot resolve L in paragraph 17.

See perlfunc/seek and perlfunc/sysseek about the SEEK_* constants.

perldoc2tree.cgi: /usr/lib/perl5/5.8.8/i386-linux-thread-multi/Fcntl.pm: cannot resolve L in paragraph 18.

See perlfunc/stat about the S_I* constants.