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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