HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                int access( const char *filename, int amode )


       - prototype in io.h

       - checks filename for existence & R/W access

       - amode = 06 -- check for R/W permission
                 04 -- check for R
                 02 -- check for W
                 01 -- execute (ignored)
                 00 -- check if filename exists

       - filename can be directory
       - returns 0 if OK
                -1 on error
                   errno = ENOENT if path or filename not found
                   errno = EACCES if permission denied

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