BSD 2.11 - man page for getlogin (bsd section 3)
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getlogin - get login name
Getlogin returns a pointer to the login name as found in /var/run/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 terminal, or if there is
no entry in /var/run/utmp for the process's terminal, getlogin returns a NULL pointer (0).
A reasonable procedure for determining the login name is to first call getlogin and if it
fails, to call getpwuid(getuid()).
getpwent(3), utmp(5), ttyslot(3)
Returns a NULL pointer (0) if name not found.
The return values point to static data whose content is overwritten by each call.
7th Edition November 27, 1996 GETLOGIN(3)
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