cuserid - get login name

Syntax	#include <stdio.h> char *cuserid(char *s);
Description	cuserid() generates a character representation of the name associated with the real user ID of the current process. If s is a null pointer, this string is generated in an area that may be static and thus overwritten by subsequent calls to cuserid(). The address of this area is returned. If s is not a null pointer, s is assumed to point to an array of at least {L_cuserid} bytes, and the string representation of the login name is placed in this array. The symbolic constant {L_cuserid} is defined in stdio.h and has a value greater than 0. cuserid() is not thread-safe.
Return val.	s	if s is not a null pointer. If the login name cannot be found, the null byte 0 will be placed at *s .
	Address of the buffer containing the login name
		if s is a null pointer and the login name can be found.
	Null pointer	if s is a null pointer and the login name cannot be found.
Notes	The functionality of cuserid() defined in the POSIX.1-1988 standard and XPG3 differs from that of historical implementations and XPG2. In the ISO POSIX-1 standard, the cuserid function has been removed entirely. Both functionalities are allowed in XPG4, but both are also marked to be withdrawn. The XPG2 functionality can be obtained by using the following syntax: getpwuid(getuid()) The XPG3 functionality can be obtained by using the following syntax: getpwuid(geteuid())
See also	getlogin(), getpwnam(), getpwuid(), getuid(), geteuid(), stdio.h, and the manual "POSIX Basics" [1 (Related publications)].