getlogin, getlogin_r, cuserid

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getlogin(3)	referred by	procenv(1) \| telnet-ssl(1) \| telnet.netkit(1) \| zshparam(1)
getlogin(3)	refer to	attributes(7) \| feature_test_macros(7) \| getuid(2) \| getutent(3) \| logname(1) \| utmp(5)