5 Fcntl - load the C Fcntl.h defines
10 use Fcntl qw(:DEFAULT :flock);
14 This module is just a translation of the C F<fcntl.h> file.
15 Unlike the old mechanism of requiring a translated F<fcntl.ph>
16 file, this uses the B<h2xs> program (see the Perl source distribution)
17 and your native C compiler. This means that it has a
18 far more likely chance of getting the numbers right.
22 Only C<#define> symbols get translated; you must still correctly
23 pack up your own arguments to pass as args for locking functions, etc.
25 =head1 EXPORTED SYMBOLS
27 By default your system's F_* and O_* constants (eg, F_DUPFD and
28 O_CREAT) and the FD_CLOEXEC constant are exported into your namespace.
30 You can request that the flock() constants (LOCK_SH, LOCK_EX, LOCK_NB
31 and LOCK_UN) be provided by using the tag C<:flock>. See L<Exporter>.
33 You can request that the old constants (FAPPEND, FASYNC, FCREAT,
34 FDEFER, FEXCL, FNDELAY, FNONBLOCK, FSYNC, FTRUNC) be provided for
35 compatibility reasons by using the tag C<:Fcompat>. For new
36 applications the newer versions of these constants are suggested
37 (O_APPEND, O_ASYNC, O_CREAT, O_DEFER, O_EXCL, O_NDELAY, O_NONBLOCK,
40 For ease of use also the SEEK_* constants (for seek() and sysseek(),
41 e.g. SEEK_END) and the S_I* constants (for chmod() and stat()) are
42 available for import. They can be imported either separately or using
43 the tags C<:seek> and C<:mode>.
45 Please refer to your native fcntl(2), open(2), fseek(3), lseek(2)
46 (equal to Perl's seek() and sysseek(), respectively), and chmod(2)
47 documentation to see what constants are implemented in your system.
49 See L<perlopentut> to learn about the uses of the O_* constants
52 See L<perlfunc/seek> and L<perlfunc/sysseek> about the SEEK_* constants.
54 See L<perlfunc/stat> about the S_I* constants.
59 our($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
68 # Named groups of exports
70 'flock' => [qw(LOCK_SH LOCK_EX LOCK_NB LOCK_UN)],
71 'Fcompat' => [qw(FAPPEND FASYNC FCREAT FDEFER FDSYNC FEXCL FLARGEFILE
72 FNDELAY FNONBLOCK FRSYNC FSYNC FTRUNC)],
73 'seek' => [qw(SEEK_SET SEEK_CUR SEEK_END)],
74 'mode' => [qw(S_ISUID S_ISGID S_ISVTX S_ISTXT
75 _S_IFMT S_IFREG S_IFDIR S_IFLNK
76 S_IFSOCK S_IFBLK S_IFCHR S_IFIFO S_IFWHT S_ENFMT
77 S_IRUSR S_IWUSR S_IXUSR S_IRWXU
78 S_IRGRP S_IWGRP S_IXGRP S_IRWXG
79 S_IROTH S_IWOTH S_IXOTH S_IRWXO
80 S_IREAD S_IWRITE S_IEXEC
81 S_ISREG S_ISDIR S_ISLNK S_ISSOCK
82 S_ISBLK S_ISCHR S_ISFIFO
88 # Items to export into callers namespace by default
89 # (move infrequently used names to @EXPORT_OK below)
162 # Other items we are prepared to export if requested
184 ), map {@{$_}} values %EXPORT_TAGS);