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uClibc thread-safety analysis

Things that are still known to be needed for thread safety:

        none

Things that might be nice, but are not required:

        getnetent_r             

        gethostent_r            

        getprotoent_r           

        getnetbyname_r          

        getnetbyaddr_r          

Functions that use static data and may still need locking:

        --------------------------------------------------------------------

        libc/inet/rpc/rpc_thread.c:

        __rpc_thread_variables is currently disabled, since thread

        local storage seems to not be correctly specified as

        weak functions.

        --------------------------------------------------------------------

        unistd/getpass.c:

        static char buf[PWD_BUFFER_SIZE];

        getpass                                           <---

        NOTE: This function returns a pointer to a static data structure.

        This seems like it requires an _r version of this function.  Glibc

        does the same thing.  Oops!  So much for thread-safe glibc!

        --------------------------------------------------------------------

        unistd/sysconf.c:

        static long int ret_vals[_UCLIBC_SYSCONF_NUM_VALID_ARGS];

        find_or_add_in_table                             <---

        main                                             <---

        NOTE: I'm not sure if this needs to be made reentrant...

        --------------------------------------------------------------------