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Guile Reference Manual

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38.4 User Information

The facilities in this section provide an interface to the user and group database. They should be used with care since they are not reentrant.

The following functions accept an object representing user information and return a selected component:

passwd:name
The name of the userid.
passwd:passwd
The encrypted passwd.
passwd:uid
The user id number.
passwd:gid
The group id number.
passwd:gecos
The full name.
passwd:dir
The home directory.
passwd:shell
The login shell.

Scheme Procedure: getpwuid uid
Look up an integer userid in the user database.

Scheme Procedure: getpwnam name
Look up a user name string in the user database.

Scheme Procedure: setpwent
Initializes a stream used by getpwent to read from the user database. The next use of getpwent will return the first entry. The return value is unspecified.

Scheme Procedure: getpwent
Return the next entry in the user database, using the stream set by setpwent.

Scheme Procedure: endpwent
Closes the stream used by getpwent. The return value is unspecified.

Scheme Procedure: setpw [arg]
C Function: scm_setpwent (arg)
If called with a true argument, initialize or reset the password data stream. Otherwise, close the stream. The setpwent and endpwent procedures are implemented on top of this.

Scheme Procedure: getpw [user]
C Function: scm_getpwuid (user)
Look up an entry in the user database. obj can be an integer, a string, or omitted, giving the behaviour of getpwuid, getpwnam or getpwent respectively.

The following functions accept an object representing group information and return a selected component:

group:name
The group name.
group:passwd
The encrypted group password.
group:gid
The group id number.
group:mem
A list of userids which have this group as a supplementary group.

Scheme Procedure: getgrgid gid
Look up an integer group id in the group database.

Scheme Procedure: getgrnam name
Look up a group name in the group database.

Scheme Procedure: setgrent
Initializes a stream used by getgrent to read from the group database. The next use of getgrent will return the first entry. The return value is unspecified.

Scheme Procedure: getgrent
Return the next entry in the group database, using the stream set by setgrent.

Scheme Procedure: endgrent
Closes the stream used by getgrent. The return value is unspecified.

Scheme Procedure: setgr [arg]
C Function: scm_setgrent (arg)
If called with a true argument, initialize or reset the group data stream. Otherwise, close the stream. The setgrent and endgrent procedures are implemented on top of this.

Scheme Procedure: getgr [name]
C Function: scm_getgrgid (name)
Look up an entry in the group database. obj can be an integer, a string, or omitted, giving the behaviour of getgrgid, getgrnam or getgrent respectively.

In addition to the accessor procedures for the user database, the following shortcut procedures are also available.

Scheme Procedure: cuserid
C Function: scm_cuserid ()
Return a string containing a user name associated with the effective user id of the process. Return #f if this information cannot be obtained.

Scheme Procedure: getlogin
C Function: scm_getlogin ()
Return a string containing the name of the user logged in on the controlling terminal of the process, or #f if this information cannot be obtained.


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