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
