pragmatism first

getlogin, getlogin_r, setlogin

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This manual	Reference	Other manuals
getlogin(2freebsd)	referred by	inetutils-telnet(1) \| setlogin(2freebsd) \| xterm(1)
getlogin(2freebsd)	refer to	daemon(3) \| setsid(2) \| su(1)