Ruby in a Nutshell

Name

Fcntl — Fcntl constant module

Synopsis

The Fcntl module provides constant definitions for IO#fcntl.

Required Library

require ‘fcntl’

Constants

F_DUPFD	Duplicates file descriptor
F_GETFD	Reads the close-on-exec flag
F_SETFD	Sets the close-on-exec flags
F_GETFL	Reads the descriptor’s flags
F_SETFL	Gets the descriptor’s flags (O_APPEND, O_NONBLOCK, or O_ASYNC)
F_GETLK	Gets the flock structure
F_SETLK	Gets lock according to the lock structure (nonblocking)
F_SETLKW	Sets lock like F_SETLK (blocking)
F_RDLCK	Reads lock flag for flock structure
F_WRLCK	Writes lock flag for flock structure
F_UNLCK	Unlocks flag for flock structure
FD_CLOEXEC	Close-on-exec flag
O_CREAT	Creates file if it doesn’t exist
O_EXCL	File shouldn’t exist before creation
O_TRUNC	Truncates to length 0
O_APPEND	Appends mode
O_NONBLOCK	Nonblocking mode
O_NDELAY	Nonblocking mode
O_RDONLY	Read-only mode
O_RDWR	Read-write mode
O_WRONLY	Write-only mode