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When doing a recv(.. MSG_WAITALL) for a message which is larger than

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the socket buffer size, the receive is done in sections.  After completing
a read, call pru_rcvd on the underlying protocol before blocking again.

This allows the the protocol to take appropriate action, such as
sending a TCP window update to the peer, if the window happened to
close because the socket buffer was filled.  If the protocol is not
notified, a TCP transfer may stall until the remote end sends a window
probe.
This commit is contained in:
Jonathan Lemon 2001-03-16 22:37:06 +00:00
parent 76db0ab017
commit 4d286823c5
1 changed files with 6 additions and 0 deletions
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6
sys/kern/uipc_socket.c
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@ -910,6 +910,12 @@ soreceive(so, psa, uio, mp0, controlp, flagsp)
!sosendallatonce(so) && !nextrecord) {
if (so->so_error || so->so_state & SS_CANTRCVMORE)
break;
/*
* Notify the protocol that some data has been
* drained before blocking.
*/
if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
(*pr->pr_usrreqs->pru_rcvd)(so, flags);
error = sbwait(&so->so_rcv);
if (error) {
sbunlock(&so->so_rcv);