Plan 9 - man page for access (plan9 section 2)
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access - determine accessibility of file
int access(char *name, int mode)
Access evaluates the given file name for accessibility. If mode&4 is nonzero, read per-
mission is expected; if mode&2, write permission; if mode&1, execute permission. If
mode==0, the file merely need exist. In any case all directories leading to the file must
permit searches. Zero is returned if the desired access is permitted, -1 if not.
Only access bits are checked. A directory may be announced as writable by access, but an
attempt to open it for writing will fail (although files may be created there); a file may
look executable, but exec(2) will fail unless it is in proper format.
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