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.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "Fcntl 3" .TH Fcntl 3 2021-06-26 "perl v5.38.0" "Perl Programmers Reference Guide" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME Fcntl \- load the C Fcntl.h defines .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 2 \& use Fcntl; \& use Fcntl qw(:DEFAULT :flock); .Ve .SH DESCRIPTION .IX Header "DESCRIPTION" This module is just a translation of the C \fIfcntl.h\fR file. Unlike the old mechanism of requiring a translated \fIfcntl.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. .SH NOTE .IX Header "NOTE" 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. .SH "EXPORTED SYMBOLS" .IX Header "EXPORTED SYMBOLS" 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. .PP You can request that the \fBflock()\fR constants (LOCK_SH, LOCK_EX, LOCK_NB and LOCK_UN) be provided by using the tag \f(CW\*(C`:flock\*(C'\fR. See Exporter. .PP 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 \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, O_SYNC, O_TRUNC). .PP For ease of use also the SEEK_* constants (for \fBseek()\fR and \fBsysseek()\fR, e.g. SEEK_END) and the S_I* constants (for \fBchmod()\fR and \fBstat()\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. .PP Please refer to your native \fBfcntl\fR\|(2), \fBopen\fR\|(2), \fBfseek\fR\|(3), \fBlseek\fR\|(2) (equal to Perl's \fBseek()\fR and \fBsysseek()\fR, respectively), and \fBchmod\fR\|(2) documentation to see what constants are implemented in your system. .PP See perlopentut to learn about the uses of the O_* constants with \fBsysopen()\fR. .PP See "seek" in perlfunc and "sysseek" in perlfunc about the SEEK_* constants. .PP See "stat" in perlfunc about the S_I* constants.