1Fcntl(3pm)             Perl Programmers Reference Guide             Fcntl(3pm)
2
3
4

NAME

6       Fcntl - load the C Fcntl.h defines
7

SYNOPSIS

9           use Fcntl;
10           use Fcntl qw(:DEFAULT :flock);
11

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.
18

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.
22

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.
26
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.
29
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).
36
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".
41
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.
45
46       See perlopentut to learn about the uses of the O_* constants with
47       sysopen().
48
49       See "seek" in perlfunc and "sysseek" in perlfunc about the SEEK_*
50       constants.
51
52       See "stat" in perlfunc about the S_I* constants.
53
54
55
56perl v5.30.2                      2020-03-27                        Fcntl(3pm)
Impressum