1Fcntl(3pm)             Perl Programmers Reference Guide             Fcntl(3pm)
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NAME

6       Fcntl - load the C Fcntl.h defines
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SYNOPSIS

9           use Fcntl;
10           use Fcntl qw(:DEFAULT :flock);
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DESCRIPTION

13       This module is just a translation of the C fcntl.h file.  Unlike the
14       old mechanism of requiring a translated fcntl.ph file, this uses the
15       h2xs program (see the Perl source distribution) and your native C
16       compiler.  This means that it has a far more likely chance of getting
17       the numbers right.
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NOTE

20       Only "#define" symbols get translated; you must still correctly pack up
21       your own arguments to pass as args for locking functions, etc.
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EXPORTED SYMBOLS

24       By default your system's F_* and O_* constants (eg, F_DUPFD and
25       O_CREAT) and the FD_CLOEXEC constant are exported into your namespace.
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27       You can request that the flock() constants (LOCK_SH, LOCK_EX, LOCK_NB
28       and LOCK_UN) be provided by using the tag ":flock".  See Exporter.
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30       You can request that the old constants (FAPPEND, FASYNC, FCREAT,
31       FDEFER, FEXCL, FNDELAY, FNONBLOCK, FSYNC, FTRUNC) be provided for
32       compatibility reasons by using the tag ":Fcompat".  For new
33       applications the newer versions of these constants are suggested
34       (O_APPEND, O_ASYNC, O_CREAT, O_DEFER, O_EXCL, O_NDELAY, O_NONBLOCK,
35       O_SYNC, O_TRUNC).
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37       For ease of use also the SEEK_* constants (for seek() and sysseek(),
38       e.g. SEEK_END) and the S_I* constants (for chmod() and stat()) are
39       available for import.  They can be imported either separately or using
40       the tags ":seek" and ":mode".
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42       Please refer to your native fcntl(2), open(2), fseek(3), lseek(2)
43       (equal to Perl's seek() and sysseek(), respectively), and chmod(2)
44       documentation to see what constants are implemented in your system.
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46       See perlopentut to learn about the uses of the O_* constants with
47       sysopen().
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49       See "seek" in perlfunc and "sysseek" in perlfunc about the SEEK_*
50       constants.
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52       See "stat" in perlfunc about the S_I* constants.
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56perl v5.36.0                      2022-08-30                        Fcntl(3pm)
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