130 lines
3.7 KiB
Groff
130 lines
3.7 KiB
Groff
.\" Copyright (c) 1990, 1991 The Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)ctermid.3 5.2 (Berkeley) 4/19/91
|
|
.\" $Id: cuserid.3,v 1.2 1994/01/10 23:32:22 jtc Exp $
|
|
.\"
|
|
.Dd November 28, 1993
|
|
.Dt CUSERID 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm cuserid
|
|
.Nd get user name
|
|
.Sh SYNOPSIS
|
|
.Fd #include <stdio.h>
|
|
.Ft char *
|
|
.Fn cuserid "char *buf"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn cuserid
|
|
function returns a character string representation of the user name
|
|
associated with the effective user ID of the calling process.
|
|
.Pp
|
|
If
|
|
.Fa buf
|
|
is not the
|
|
.Dv NULL
|
|
pointer, the user name is copied into the memory referenced by
|
|
.Fa buf .
|
|
The argument
|
|
.Fa buf
|
|
is assumed to point to an array at least
|
|
.Dv L_cuserid
|
|
(as defined in the include
|
|
file
|
|
.Aq Pa stdio.h )
|
|
bytes long.
|
|
Otherwise, the user name is copied to a static buffer.
|
|
.Pp
|
|
.Sh RETURN VALUES
|
|
If
|
|
.Fa buf
|
|
is not the
|
|
.Dv NULL
|
|
pointer,
|
|
.Fa buf
|
|
is returned;
|
|
otherwise the address of the static buffer is returned.
|
|
.Pp
|
|
If the user name could not be determined, if
|
|
.Fa buf
|
|
is not the
|
|
.Dv NULL
|
|
pointer, the null character
|
|
.Sq \e0
|
|
will be stored at
|
|
.Fa *buf ;
|
|
otherwise
|
|
the
|
|
.Dv NULL
|
|
pointer is returned.
|
|
.Sh SEE ALSO
|
|
.Xr getlogin 2 ,
|
|
.Xr getpwent 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn cuserid
|
|
function conforms to
|
|
.St -p1003.1-88 .
|
|
.Sh BUGS
|
|
Due to irreconcilable differences in historic implementations,
|
|
.Fn cuserid
|
|
was removed from the
|
|
.St -p1003.1-90
|
|
standard.
|
|
This implementation exists purely for compatibility with existing programs.
|
|
New programs should use one of the following three alternatives to
|
|
obtain the user name:
|
|
.Pp
|
|
.Bl -enum -offset indent -compact
|
|
.It
|
|
.Fn getlogin
|
|
to return the user's login name.
|
|
.It
|
|
.Nm getpwuid Ns Pq Fn geteuid
|
|
to return the user name associated with the calling process' effective user ID.
|
|
.It
|
|
.Nm getpwuid Ns Pq Fn getuid
|
|
to return the user name associated with the calling process' real user ID.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn cuserid
|
|
function uses
|
|
.Fn getpwuid ;
|
|
thus the results of a user's call to
|
|
.Fn getpwent ,
|
|
.Fn getpwnam
|
|
or
|
|
.Fn getpwuid
|
|
will be overwritten by subsequent calls to
|
|
.Fn cuserid .
|