Fcntl - load the C Fcntl.h defines
use Fcntl qw(:DEFAULT :flock);
This module is just a translation of the C F<fcntl.h> file.
Unlike the old mechanism of requiring a translated F<fcntl.ph>
file, this uses the B<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.
Only C<#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 provided by using the tag C<:flock>. See L<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 C<: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,
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 C<:seek> and C<: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 L<perlopentut> to learn about the uses of the O_* constants
See L<perlfunc/seek> and L<perlfunc/sysseek> about the SEEK_* constants.
See L<perlfunc/stat> about the S_I* constants.
our($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS, $AUTOLOAD);
# Items to export into callers namespace by default
# (move infrequently used names to @EXPORT_OK below)
# Other items we are prepared to export if requested
S_IFSOCK S_IFBLK S_IFCHR S_IFIFO S_IFWHT S_ENFMT
S_IRGRP S_IWGRP S_IXGRP S_IRWXG
S_IROTH S_IWOTH S_IXOTH S_IRWXO
S_IRUSR S_IWUSR S_IXUSR S_IRWXU
S_ISUID S_ISGID S_ISVTX S_ISTXT
_S_IFMT S_IFREG S_IFDIR S_IFLNK
&S_ISREG &S_ISDIR &S_ISLNK &S_ISSOCK &S_ISBLK &S_ISCHR &S_ISFIFO
&S_ISWHT &S_ISENFMT &S_IFMT &S_IMODE
# Named groups of exports
'flock' => [qw(LOCK_SH LOCK_EX LOCK_NB LOCK_UN)],
'Fcompat' => [qw(FAPPEND FASYNC FCREAT FDEFER FDSYNC FEXCL FLARGEFILE
FNDELAY FNONBLOCK FRSYNC FSYNC FTRUNC)],
'seek' => [qw(SEEK_SET SEEK_CUR SEEK_END)],
'mode' => [qw(S_ISUID S_ISGID S_ISVTX S_ISTXT
_S_IFMT S_IFREG S_IFDIR S_IFLNK
S_IFSOCK S_IFBLK S_IFCHR S_IFIFO S_IFWHT S_ENFMT
S_IRUSR S_IWUSR S_IXUSR S_IRWXU
S_IRGRP S_IWGRP S_IXGRP S_IRWXG
S_IROTH S_IWOTH S_IXOTH S_IRWXO
S_ISREG S_ISDIR S_ISLNK S_ISSOCK
sub S_IFMT
{ @_ ?
( $_[0] & _S_IFMT
() ) : _S_IFMT
() }
sub S_IMODE
{ $_[0] & 07777 }
sub S_ISREG
{ ( $_[0] & _S_IFMT
() ) == S_IFREG
() }
sub S_ISDIR
{ ( $_[0] & _S_IFMT
() ) == S_IFDIR
() }
sub S_ISLNK
{ ( $_[0] & _S_IFMT
() ) == S_IFLNK
() }
sub S_ISSOCK
{ ( $_[0] & _S_IFMT
() ) == S_IFSOCK
() }
sub S_ISBLK
{ ( $_[0] & _S_IFMT
() ) == S_IFBLK
() }
sub S_ISCHR
{ ( $_[0] & _S_IFMT
() ) == S_IFCHR
() }
sub S_ISFIFO
{ ( $_[0] & _S_IFMT
() ) == S_IFIFO
() }
sub S_ISWHT
{ ( $_[0] & _S_IFMT
() ) == S_IFWHT
() }
sub S_ISENFMT
{ ( $_[0] & _S_IFMT
() ) == S_IFENFMT
() }
(my $constname = $AUTOLOAD) =~ s/.*:://;
die "&Fcntl::constant not defined" if $constname eq 'constant';
my ($error, $val) = constant
($constname);
my (undef,$file,$line) = caller;
die "$error at $file line $line.\n";
*$AUTOLOAD = sub { $val };
XSLoader
::load
'Fcntl', $VERSION;