v7 man page for getlogin

GETLOGIN(3)						     Library Functions Manual						       GETLOGIN(3)

NAME
       getlogin - get login name

SYNOPSIS
       char *getlogin();

DESCRIPTION
       Getlogin  returns  a  pointer  to  the login name as found in /etc/utmp.  It may be used in conjunction with getpwnam to locate the correct
       password file entry when the same userid is shared by several login names.

       If getlogin is called within a process that is not attached to a typewriter, it returns NULL.  The correct procedure  for  determining  the
       login name is to first call getlogin and if it fails, to call getpwuid.

FILES
       /etc/utmp

SEE ALSO
       getpwent(3), getgrent(3), utmp(5)

DIAGNOSTICS
       Returns NULL (0) if name not found.

BUGS
       The return values point to static data whose content is overwritten by each call.

																       GETLOGIN(3)