'\" te
.\"  Copyright 1989 AT&T  Copyright (c) 1997, Sun Microsystems, Inc.  All Rights Reserved
.TH cuserid 3C "30 Dec 1996" "SunOS 5.11" "Standard C Library Functions"
.SH NAME
cuserid \- get character login name of the user
.SH SYNOPSIS
.LP
.nf
#include <stdio.h>

\fBchar *\fR\fBcuserid\fR(\fBchar *\fR\fIs\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBcuserid()\fR function generates a character-string representation of the login name under which the owner of the current process is logged in. If \fIs\fR is a null pointer, this representation is generated in an internal static area whose address is returned. Otherwise, \fIs\fR is assumed to point to an array of at least \fBL_cuserid\fR characters; the representation is left in this array. The constant \fBL_cuserid\fR is defined in the <\fBstdio.h\fR> header.
.sp
.LP
In multithreaded applications, the caller must always supply an array \fIs\fR for the return value.
.SH RETURN VALUES
.sp
.LP
If the login name cannot be found, \fBcuserid()\fR returns a null pointer.  If \fIs\fR is not a null pointer, the null character \fB`\e0'\fR will be placed at \fIs\fR[\fB0\fR].
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBgetlogin\fR(3C), \fBgetpwnam\fR(3C), \fBattributes\fR(5)