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BSD 2.11 - man page for getlogin (bsd section 3)

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 /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()).
FILES
/var/run/utmp
SEE ALSO
getpwent(3), utmp(5), ttyslot(3)
DIAGNOSTICS
Returns a NULL pointer (0) if name not found.
BUGS
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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