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Fcntl(3)	       Perl Programmers	Reference Guide		      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 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 v5.35.11			  2022-03-27			      Fcntl(3)

NAME | SYNOPSIS | DESCRIPTION | NOTE | EXPORTED SYMBOLS

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