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.TH Fcntl 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide"
Fcntl \- load the C Fcntl.h defines
\& use Fcntl qw(:DEFAULT :flock);
This module is just a translation of the C \fIfnctl.h\fR file.
Unlike the old mechanism of requiring a translated \fIfnctl.ph\fR
file, this uses the \fBh2xs\fR 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 \f(CW\*(C`#define\*(C'\fR symbols get translated; you must still correctly
pack up your own arguments to pass as args for locking functions, etc.
.IX Header "EXPORTED SYMBOLS"
By default your system's F_* and O_* constants (eg, F_DUPFD and
O_CREAT) and the \s-1FD_CLOEXEC\s0 constant are exported into your namespace.
You can request that the \fIflock()\fR constants (\s-1LOCK_SH\s0, \s-1LOCK_EX\s0, \s-1LOCK_NB\s0
and \s-1LOCK_UN\s0) be provided by using the tag \f(CW\*(C`:flock\*(C'\fR. See Exporter.
You can request that the old constants (\s-1FAPPEND\s0, \s-1FASYNC\s0, \s-1FCREAT\s0,
\&\s-1FDEFER\s0, \s-1FEXCL\s0, \s-1FNDELAY\s0, \s-1FNONBLOCK\s0, \s-1FSYNC\s0, \s-1FTRUNC\s0) be provided for
compatibility reasons by using the tag \f(CW\*(C`:Fcompat\*(C'\fR. 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 \fIseek()\fR and \fIsysseek()\fR,
e.g. \s-1SEEK_END\s0) and the S_I* constants (for \fIchmod()\fR and \fIstat()\fR) are
available for import. They can be imported either separately or using
the tags \f(CW\*(C`:seek\*(C'\fR and \f(CW\*(C`:mode\*(C'\fR.
Please refer to your native \fIfcntl\fR\|(2), \fIopen\fR\|(2), \fIfseek\fR\|(3), \fIlseek\fR\|(2)
(equal to Perl's \fIseek()\fR and \fIsysseek()\fR, respectively), and \fIchmod\fR\|(2)
documentation to see what constants are implemented in your system.
See perlopentut to learn about the uses of the O_* constants
See \*(L"seek\*(R" in perlfunc and \*(L"sysseek\*(R" in perlfunc about the SEEK_* constants.
See \*(L"stat\*(R" in perlfunc about the S_I* constants.