Actually, there is some evidence that this is a bug, and that current
behaviour is not intentional.
$ grep . . ; echo $?
1
open(".", O_RDONLY|O_LARGEFILE) = 3
read(3, 0x8061000, 32768) = -1 EISDIR (Is a directory)
close(3) = 0
So there was a read error, and grep didn't report it.
NEWS.gz reads:
|- `grep' now searches directories just like ordinary files; it no longer
|silently skips directories. This is the traditional behavior of
|Unix text utilities (in particular, of traditional `grep').
|Hence `grep PATTERN DIRECTORY' should report
|`grep: DIRECTORY: Is a directory' on hosts where the operating system
|does not permit programs to read directories directly, and
|`grep: DIRECTORY: Binary file matches' (or nothing) otherwise.
So it would seem that grep really should have generated a
diagnostic/warning.
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