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Within LTS Haskell 24.63 (ghc-9.10.3)
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getEffectiveGroupID :: IO GroupIDunix System.Posix.User getEffectiveGroupID calls getegid to obtain the effective GroupID associated with the current process.
getEffectiveUserID :: IO UserIDunix System.Posix.User getEffectiveUserID calls geteuid to obtain the effective UserID associated with the current process.
getGroupEntryForID :: GroupID -> IO GroupEntryunix System.Posix.User getGroupEntryForID gid calls getgrgid_r to obtain the GroupEntry information associated with GroupID gid. This operation may fail with isDoesNotExistError if no such group exists.
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unix System.Posix.User getRealGroupID calls getgid to obtain the real GroupID associated with the current process.
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unix System.Posix.User getRealUserID calls getuid to obtain the real UserID associated with the current process.
getUserEntryForID :: UserID -> IO UserEntryunix System.Posix.User getUserEntryForID uid calls getpwuid_r to obtain the UserEntry information associated with UserID uid. This operation may fail with isDoesNotExistError if no such user exists.
groupID :: GroupEntry -> GroupIDunix System.Posix.User No documentation available.
setEffectiveGroupID :: GroupID -> IO ()unix System.Posix.User setEffectiveGroupID uid calls setegid to set the effective group-id associated with the current process to gid. This does not update the real group-id or set-group-id.
setEffectiveUserID :: UserID -> IO ()unix System.Posix.User setEffectiveUserID uid calls seteuid to set the effective user-id associated with the current process to uid. This does not update the real user-id or set-user-id.
setGroupID :: GroupID -> IO ()unix System.Posix.User setGroupID gid calls setgid to set the real, effective, and saved set-group-id associated with the current process to gid.