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NetBSD 6.1.5 - man page for cuserid (netbsd section 3)

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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
     '\0' 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 com-
     patibility 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
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