pipe_read
static int pipe_read(file_t *, off_t *, struct uio *, kauth_cred_t, int);
.fo_read = pipe_read,
ATF_TC(pipe_read);
ATF_TC_HEAD(pipe_read, tc)
ATF_TC_BODY(pipe_read, tc)
ATF_TP_ADD_TC(tp, pipe_read);