System.Posix.FileControl

Documentation

fcntl :: Fd -> Fcntl a -> IO a

Perform one of the operations in Fcntl

data Fcntl a where

Type of operations which fcntl can perform. Available operations vary depending on platforms. Please consult manpage on your platform for details.

All possible operations are:

• Duplicating a file descriptor

  • F_DUPFD
  • F_DUPFD_CLOEXEC

• File descriptor flags

  • F_GETFD:
  • F_SETFD
• File status flags
• F_GETFL
• F_SETFL
• Advisory or mandatory locking
• F_GETLK
• F_SETLK
• F_SETLKW
• Open file description locks (Linux 3.15 or later).

-fgnu flag needs to be enabled to use this feature.

• F_OFD_GETLK
• F_OFD_SETLK
• F_OFD_SETLKW
• Managing signals
• F_GETOWN
• F_SETOWN
• F_GETOWN_EX
• F_SETOWN_EX
• F_GETSIG
• F_SETSIG
• Leases
• F_GETLEASE
• F_SETLEASE
• File and directory change notification (dnotify; Linux 2.4 or later)
• F_NOTIFY
• Changing the capacity of a pipe
• F_GETPIPE_SZ
• F_SETPIPE_SZ
• File leasing
• F_GET_SEALS
• F_ADD_SEALS

Constructors

F_DUPFD :: Fd -> Fcntl Fd

F_DUPFD_CLOEXEC :: Fd -> Fcntl Fd

F_GETFD :: Fcntl FileDescriptorFlags

F_SETFD :: FileDescriptorFlags -> Fcntl ()

F_GETFL :: Fcntl FileStatusFlags

F_SETFL :: FileStatusFlags -> Fcntl ()

F_GETLK :: Fcntl Flock

F_SETLK :: Flock -> Fcntl ()

F_SETLKW :: Flock -> Fcntl ()

F_GETOWN :: Fcntl ProcessID

F_SETOWN :: ProcessID -> Fcntl ()

File descriptor flags

data FileDescriptorFlags

pattern FD_CLOEXEC :: FileDescriptorFlags

File status flags

data FileStatusFlags

pattern O_RDONLY :: FileStatusFlags

pattern O_WRONLY :: FileStatusFlags

pattern O_RDWR :: FileStatusFlags

pattern O_ACCMODE :: FileStatusFlags

pattern O_CREAT :: FileStatusFlags

pattern O_EXCL :: FileStatusFlags

pattern O_NONBLOCK :: FileStatusFlags

pattern O_NOCTTY :: FileStatusFlags

pattern O_TRUNC :: FileStatusFlags

pattern O_APPEND :: FileStatusFlags

pattern O_NDELAY :: FileStatusFlags

Advisory and mandatory locking

data Flock

newFlock :: IO Flock

Allocate a flock structure. The allocated memory will be garbage collected automatically.

flockType :: Flock -> Var FlockType

data FlockType

pattern F_RDLCK :: FlockType

pattern F_WRLCK :: FlockType

pattern F_UNLCK :: FlockType

flockWhence :: Flock -> Var FlockWhence

data FlockWhence

pattern SEEK_SET :: FlockWhence

pattern SEEK_CUR :: FlockWhence

pattern SEEK_END :: FlockWhence

flockStart :: Flock -> Var FileOffset

flockLen :: Flock -> Var FileOffset

flockPid :: Flock -> Var ProcessID