CUSERID(3)						   BSD Library Functions Manual 						CUSERID(3)

NAME

     cuserid -- get user name

LIBRARY

     Compatibility Library (libcompat, -lcompat)

SYNOPSIS

     #include <stdio.h>

     char *
     cuserid(char *buf);

DESCRIPTION

     This interface is available from the compatibility library, libcompat and has been obsoleted by getlogin(2).

     The cuserid() function returns a character string representation of the user name associated with the effective user ID of the calling
     process.

     If buf is not the NULL pointer, the user name is copied into the memory referenced by buf.  The argument buf is assumed to point to an array
     at least L_cuserid (as defined in the include file <stdio.h>) bytes long.	Otherwise, the user name is copied to a static buffer.

RETURN VALUES

     If buf is not the NULL pointer, buf is returned; otherwise the address of the static buffer is returned.

     If the user name could not be determined, if buf is not the NULL pointer, the null character '' will be stored at *buf; otherwise the NULL
     pointer is returned.

SEE ALSO

     getlogin(2), getpwent(3)

STANDARDS

     The cuserid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

BUGS

     Due to irreconcilable differences in historic implementations, cuserid() was removed from the ISO/IEC 9945-1:1990 (``POSIX.1'') 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:

	   1.	getlogin() to return the user's login name.
	   2.	getpwuid(geteuid()) to return the user name associated with the calling process' effective user ID.
	   3.	getpwuid(getuid()) to return the user name associated with the calling process' real user ID.

BSD
								 November 28, 1993							       BSD