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from: @(#)ctermid.3 5.2 (Berkeley) 4/19/91
$NetBSD: cuserid.3,v 1.13 2010/03/22 21:55:39 joerg Exp $
.Dd November 28, 1993 .Dt CUSERID 3 .Os .Sh NAME .Nm cuserid .Nd get user name .Sh LIBRARY .Lb libcompat .Sh SYNOPSIS n stdio.h .Ft char * .Fn cuserid "char *buf" .Sh DESCRIPTION f -symbolic This interface is available from the compatibility library, libcompat and has been obsoleted by .Xr getlogin 2 . .Ef
p The .Fn cuserid function returns a character string representation of the user name associated with the effective user ID of the calling process.
p 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 n stdio.h ) bytes long. Otherwise, the user name is copied to a static buffer. .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.
p 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:
p l -enum -offset indent -compact t .Fn getlogin to return the user's login name. t .Nm getpwuid Ns Pq Fn geteuid to return the user name associated with the calling process' effective user ID. t .Nm getpwuid Ns Pq Fn getuid to return the user name associated with the calling process' real user ID. .El
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