unix-2.4.0.1: POSIX functionalitySource codeContentsIndex
System.Posix.Unistd
Portabilitynon-portable (requires POSIX)
Stabilityprovisional
Maintainerlibraries@haskell.org
Contents
System environment
Sleeping
Description
POSIX miscellaneous stuff, mostly from unistd.h
Synopsis
data SystemID = SystemID {
systemName :: String
nodeName :: String
release :: String
version :: String
machine :: String
}
getSystemID :: IO SystemID
data SysVar
= ArgumentLimit
| ChildLimit
| ClockTick
| GroupLimit
| OpenFileLimit
| PosixVersion
| HasSavedIDs
| HasJobControl
getSysVar :: SysVar -> IO Integer
sleep :: Int -> IO Int
usleep :: Int -> IO ()
nanosleep :: Integer -> IO ()
System environment
data SystemID Source
Constructors
SystemID
systemName :: String
nodeName :: String
release :: String
version :: String
machine :: String
getSystemID :: IO SystemIDSource
data SysVar Source
Constructors
ArgumentLimit
ChildLimit
ClockTick
GroupLimit
OpenFileLimit
PosixVersion
HasSavedIDs
HasJobControl
getSysVar :: SysVar -> IO IntegerSource
Sleeping
sleep :: Int -> IO IntSource

Sleep for the specified duration (in seconds). Returns the time remaining (if the sleep was interrupted by a signal, for example).

GHC Note: the comment for usleep also applies here.

usleep :: Int -> IO ()Source

Sleep for the specified duration (in microseconds).

GHC Note: Control.Concurrent.threadDelay is a better choice. Without the -threaded option, usleep will block all other user threads. Even with the -threaded option, usleep requires a full OS thread to itself. Control.Concurrent.threadDelay has neither of these shortcomings.

nanosleep :: Integer -> IO ()Source
Sleep for the specified duration (in nanoseconds)
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