141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/* $NetBSD: net.c,v 1.35 2009/04/11 10:57:55 lukem Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#ifdef _STANDALONE
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#include <lib/libkern/libkern.h>
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#else
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#include <string.h>
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#endif
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#include <net/if.h>
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#include <net/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#ifdef _STANDALONE
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#include "stand.h"
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#define delay()
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#else
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#define panic printf
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#define delay() usleep(100000)
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#define getsecs() time(NULL)
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#endif
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#include "net.h"
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/*
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* Send a packet and wait for a reply, with exponential backoff.
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*
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* The send routine must return the actual number of bytes written,
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* or -1 on error.
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*
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* The receive routine can indicate success by returning the number of
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* bytes read; it can return 0 to indicate EOF; it can return -1 with a
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* non-zero errno to indicate failure; finally, it can return -1 with a
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* zero errno to indicate it isn't done yet.
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*/
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ssize_t
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sendrecv(struct iodesc *d,
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ssize_t (*sproc)(struct iodesc *, void *, size_t),
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void *sbuf, size_t ssize,
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ssize_t (*rproc)(struct iodesc *, void *, size_t, saseconds_t),
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void *rbuf, size_t rsize)
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{
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ssize_t cc;
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satime_t t, tlast;
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saseconds_t tmo, tleft;
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#ifdef NET_DEBUG
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if (debug)
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printf("sendrecv: called\n");
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#endif
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tmo = MINTMO;
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tlast = 0;
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tleft = 0;
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t = getsecs();
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for (;;) {
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if (tleft <= 0) {
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if (tmo >= MAXTMO) {
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errno = ETIMEDOUT;
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return -1;
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}
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cc = (*sproc)(d, sbuf, ssize);
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tleft = tmo;
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tmo <<= 1;
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if (tmo > MAXTMO)
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tmo = MAXTMO;
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if (cc == -1) {
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/* Error on transmit; wait before retrying */
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while ((getsecs() - t) < tmo)
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delay();
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tleft = 0;
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continue;
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}
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if ((size_t)cc < ssize)
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panic("sendrecv: short write! (%zd < %zu)",
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cc, ssize);
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tlast = t;
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}
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/* Try to get a packet and process it. */
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cc = (*rproc)(d, rbuf, rsize, tleft);
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/* Return on data, EOF or real error. */
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if (cc != -1 || errno != 0)
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return cc;
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/* Timed out or didn't get the packet we're waiting for */
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t = getsecs();
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tleft -= t - tlast;
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tlast = t;
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}
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}
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