getlogin(3)
Name
getlogin − get login name
Syntax
char *getlogin()
Description
The getlogin subroutine 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 getpw ( getuid ).
Restrictions
The return values point to static data whose content is overwritten by each call.
Return Values
Returns NULL (0) if name not found.
Files
/etc/utmp