LibBSD | rtemsbsd/libio: Give a duplicated descriptor an identity of its own (!153)

[Sang Woo Kim (@physwkim)]

Sang Woo Kim commented on a discussion on testsuite/pipe01/test_main.c: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/153#note_155910

 > +
 > +	rv = pipe2(fd, O_NONBLOCK);
 > +	assert(rv == 0);
 > +
 > +	errno = 0;
 > +	n = read(fd[0], &buf[0], sizeof(buf));
 > +	assert(n == -1);
 > +	assert(errno == EAGAIN);
 > +
 > +	rv = close(fd[0]);
 > +	assert(rv == 0);
 > +	rv = close(fd[1]);
 > +	assert(rv == 0);
 > +
 > +	errno = 0;
 > +	rv = pipe2(fd, 0x40000000);

An arbitrary bit that maps to no O_ flag — the intent was to exercise the unknown-flag EINVAL path. Changed to `~(O_NONBLOCK | O_CLOEXEC)` so the test states that intent.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/153#note_155910
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