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char *getlogin()
getlogin() 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 user ID 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 /etc/utmp for the process's terminal, it returns a NULL pointer. The correct procedure for determining the login name is to call cuserid(), or to call getlogin() and, if it fails, to call getpwuid(getuid()).
getlogin() returns a pointer to the login name on success. If the name is not found, it returns NULL.
The return values point to static data whose content is overwritten by each call.
getlogin() does not work for processes running under a pty (for example, emacs shell buffers, or shell tools) unless the program ``fakes'' the login name in the /etc/utmp file.
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Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97