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

       Fcntl - load the C Fcntl.h defines

	   use Fcntl;
	   use Fcntl qw(:DEFAULT :flock);

       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 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 pro-
       vided 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 constants are suggested (O_APPEND,

       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 imple-
       mented 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 v5.8.0				    2002-06-01				       Fcntl(3pm)
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