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32.17. Fcntl
use Fcntl; # Import standard fcntl.h constants.
use Fcntl ":flock";# Import LOCK_* constants.
use Fcntl ":seek"; # Import SEEK_CUR, SEEK_SET, SEEK_END.
use Fcntl ":mode"; # Import S_* stat checking constants.
use Fcntl ":Fcompat"; # Import F* constants.
The Fcntl module provides constants for use with various Perl
built-in functions. The default set of imports includes constants
like F_GETFL and F_SETFL for fcntl, SEEK_SET and
SEEK_END for seek and sysseek, and O_CREAT and O_EXCL
for sysopen. Supported import tags include ":flock" to access
the LOCK_EX, LOCK_NB, LOCK_SH, and LOCK_UN constants for
flock; ":mode" to get at constants from sys/stat.h like
S_IRUSR and S_ISFIFO; ":seek" to get at the three arguments
for seek and sysseek; and ":Fcompat" to get the old-style
symbols with a leading "F" but not "F_", like FAPPEND,
FASYNC, and FNONBLOCK. See the online documentation for the
Fcntl module and your operating system's documentation on the
relevant syscalls, like fcntl(2), lseek(2), open(2), and
stat(2).