getProcessID :: IO ProcessID |
getProcessID
calls getpid
to obtain the ProcessID for
the current process.
getParentProcessID :: IO ProcessID |
getProcessID
calls getppid
to obtain the ProcessID for
the parent of the current process.
getRealUserID :: IO UserID |
getRealUserID
calls getuid
to obtain the real UserID
associated with the current process.
getEffectiveUserID :: IO UserID |
getEffectiveUserID
calls geteuid
to obtain the effective
UserID associated with the current process.
setUserID :: UserID -> IO () |
setUserID uid calls setuid
to set the real, effective, and
saved set-user-id associated with the current process to uid.
getLoginName :: IO String |
getLoginName
calls getlogin
to obtain the login name
associated with the current process.
getRealGroupID :: IO GroupID |
getRealGroupID
calls getgid
to obtain the real GroupID
associated with the current process.
getEffectiveGroupID :: IO GroupID |
getEffectiveGroupID
calls getegid
to obtain the effective
GroupID associated with the current process.
setGroupID :: GroupID -> IO () |
setGroupID gid calls setgid
to set the real, effective, and
saved set-group-id associated with the current process to gid.
getGroups :: IO [GroupID] |
getGroups
calls getgroups
to obtain the list of
supplementary GroupIDs associated with the current process.
getEffectiveUserName :: IO String |
getEffectiveUserName
calls cuserid
to obtain a name
associated with the effective UserID of the process.
getProcessGroupID :: IO ProcessGroupID |
getProcessGroupID
calls getpgrp
to obtain the
ProcessGroupID for the current process.
createProcessGroup :: ProcessID -> IO ProcessGroupID |
createProcessGroup pid calls setpgid
to make
process pid a new process group leader.
joinProcessGroup :: ProcessGroupID -> IO ProcessGroupID |
joinProcessGroup pgid calls setpgid
to set the
ProcessGroupID of the current process to pgid.
setProcessGroupID :: ProcessID -> ProcessGroupID -> IO () |
setProcessGroupID pid pgid calls setpgid
to set the
ProcessGroupID for process pid to pgid.
createSession :: IO ProcessGroupID |
createSession
calls setsid
to create a new session
with the current process as session leader.
systemName :: SystemID -> String nodeName :: SystemID -> String release :: SystemID -> String version :: SystemID -> String machine :: SystemID -> String getSystemID :: IO SystemID |
getSystemID
calls uname
to obtain information
about the current operating system.
> epochTime :: IO EpochTime |
epochTime
calls time
to obtain the number of
seconds that have elapsed since the epoch (Jan 01 00:00:00 GMT 1970).
elapsedTime :: ProcessTimes -> ClockTick userTime :: ProcessTimes -> ClockTick systemTime :: ProcessTimes -> ClockTick childUserTime :: ProcessTimes -> ClockTick childSystemTime :: ProcessTimes -> ClockTick getProcessTimes :: IO ProcessTimes |
getProcessTimes
calls times
to obtain time-accounting
information for the current process and its children.
getControllingTerminalName :: IO FilePath |
getControllingTerminalName
calls ctermid
to obtain
a name associated with the controlling terminal for the process. If a
controlling terminal exists,
getControllingTerminalName
returns the name of the
controlling terminal.
The operation may fail with:
There is no controlling terminal, or its name cannot be determined.
Various other causes.
getTerminalName :: Fd -> IO FilePath |
getTerminalName fd calls ttyname
to obtain a name associated
with the terminal for Fd fd. If fd is associated
with a terminal, getTerminalName
returns the name of the
terminal.
The operation may fail with:
The channel is not associated with a terminal.
The channel is associated with a terminal, but it has no name.
Various other causes.
queryTerminal :: Fd -> IO Bool |
queryTerminal fd calls isatty
to determine whether or
not Fd fd is associated with a terminal.
getSysVar :: SysVar -> IO Limit |
getSysVar var calls sysconf
to obtain the
dynamic value of the requested configurable system limit or option.
For defined system limits, getSysVar
returns the associated
value. For defined system options, the result of getSysVar
is undefined, but not failure.
The operation may fail with:
The requested system limit or option is undefined.