7.2.26 Fcntl - Load the C fcntl.h Defines

use Fcntl;  $nonblock_flag = O_NDELAY(); $create_flag = O_CREAT(); $read_write_flag = O_RDWR();

This module is just a translation of the C fcntl.h file. Unlike the old mechanism which required a translated fcntl.ph file, fcntl uses the h2xs program (see the Perl source distribution) and your native C compiler. This means that it has a much better chance of getting the numbers right.

Note that only #define symbols get translated; you must still correctly pack up your own arguments to pass as arguments for locking functions and so on.

The following routines are exported by default, and each routine returns the value of the #define that is the same as the routine name:

FD_CLOEXEC	F_DUPFD	F_GETFD	F_GETFL	F_GETLK	F_RDLCK
F_SETFD	F_SETFL	F_SETLK	F_SETLKW	F_UNLCK	F_WRLCK
O_APPEND	O_CREAT	O_EXCL	O_NDELAY	O_NOCTTY
O_NONBLOCK	O_RDONLY	O_RDWR	O_TRUNC	O_WRONLY