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8304de2e34
(login): Use mutex to secure against concurrent access to wtmp file. (logout): Rewrite using POSIX calls. (utmp_fd): Initialized to -1 now. Any value < 0 is treated as closed in subsequent functions. (utmp_readonly): New variable, indicating utmp file open for reading only. (internal_setutent): New function implementing setutent(). (setutent): Call internal_setutent now. (endutent): Reset utmp_readonly. (getutent): Return immediately if utmp file can't be opened. (getutid): Ditto. (getutline): Ditto. (pututline): Ditto. Use mutex to secure against concurrent access to utmp file.