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Switch behavior of fifos to more closely match what goes on in other OSes.

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Basically FIFOs become a real pain to abuse as a rendevous point without
this change because you can't really select(2) on them because they always
return ready even though there is no writer (to signal EOF).

Obtained from: BSD/os
This commit is contained in:
Alfred Perlstein 2001-11-08 10:28:32 +00:00
parent ce17880650
commit d25c683ad5
1 changed files with 5 additions and 0 deletions
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5
sys/fs/fifofs/fifo_vnops.c
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@ -284,6 +284,11 @@ fifo_read(ap)
VOP_UNLOCK(ap->a_vp, 0, td);
error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
(struct mbuf **)0, (int *)0);
/*
* Clear EOF indication after first such return.
*/
if (uio->uio_resid == startresid)
rso->so_state &= ~SS_CANTRCVMORE;
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
if (ap->a_ioflag & IO_NDELAY)
rso->so_state &= ~SS_NBIO;