Portability	non-portable (requires POSIX)
Stability	provisional
Maintainer	libraries@haskell.org

System.Posix.User

Contents

User environment
- Querying the user environment
  - The group database
  - The user database
- Modifying the user environment

Description

POSIX user/group support

Synopsis

User environment

Querying the user environment

getRealUserID :: IO UserID Source

getRealUserID calls getuid to obtain the real UserID associated with the current process.

getRealGroupID :: IO GroupID Source

getRealGroupID calls getgid to obtain the real GroupID associated with the current process.

getEffectiveUserID :: IO UserID Source

getEffectiveUserID calls geteuid to obtain the effective UserID associated with the current process.

getEffectiveGroupID :: IO GroupID Source

getEffectiveGroupID calls getegid to obtain the effective GroupID associated with the current process.

getGroups :: IO [GroupID]Source

getGroups calls getgroups to obtain the list of supplementary GroupIDs associated with the current process.

getLoginName :: IO String Source

getLoginName calls getlogin to obtain the login name associated with the current process.

getEffectiveUserName :: IO String Source

getEffectiveUserName gets the name associated with the effective UserID of the process.

The group database

data GroupEntry Source

Constructors

GroupEntry
Fields groupName :: String The name of this group (gr_name) groupPassword :: String The password for this group (gr_passwd) groupID :: GroupID The unique numeric ID for this group (gr_gid) groupMembers :: [String] A list of zero or more usernames that are members (gr_mem)

Instances

Eq GroupEntry
Read GroupEntry
Show GroupEntry

getGroupEntryForID :: GroupID -> IO GroupEntry Source

getGroupEntryForID gid calls getgrgid to obtain the GroupEntry information associated with GroupID gid.

getGroupEntryForName :: String -> IO GroupEntry Source

getGroupEntryForName name calls getgrnam to obtain the GroupEntry information associated with the group called name.

getAllGroupEntries :: IO [GroupEntry]Source

getAllGroupEntries returns all group entries on the system by repeatedly calling getgrent

The user database

data UserEntry Source

Constructors

UserEntry

Fields

userName :: String: Textual name of this user (pw_name)
userPassword :: String: Password -- may be empty or fake if shadow is in use (pw_passwd)
userID :: UserID: Numeric ID for this user (pw_uid)
userGroupID :: GroupID: Primary group ID (pw_gid)
userGecos :: String: Usually the real name for the user (pw_gecos)
homeDirectory :: String: Home directory (pw_dir)
userShell :: String: Default shell (pw_shell)

Instances

Eq UserEntry
Read UserEntry
Show UserEntry

getUserEntryForID :: UserID -> IO UserEntry Source

getUserEntryForID gid calls getpwuid to obtain the UserEntry information associated with UserID uid.

getUserEntryForName :: String -> IO UserEntry Source

getUserEntryForName name calls getpwnam to obtain the UserEntry information associated with the user login name.

getAllUserEntries :: IO [UserEntry]Source

getAllUserEntries returns all user entries on the system by repeatedly calling getpwent

Modifying the user environment

setUserID :: UserID -> IO ()Source

setUserID uid calls setuid to set the real, effective, and saved set-user-id associated with the current process to uid.

setGroupID :: GroupID -> IO ()Source

setGroupID gid calls setgid to set the real, effective, and saved set-group-id associated with the current process to gid.

setEffectiveUserID :: UserID -> IO ()Source

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.

setEffectiveGroupID :: GroupID -> IO ()Source

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.

setGroups :: [GroupID] -> IO ()Source

setGroups calls setgroups to set the list of supplementary GroupIDs associated with the current process.