Initial Contribution
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The Android Open Source Project
311
libc/netbsd/isc/ev_streams.c
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311
libc/netbsd/isc/ev_streams.c
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/* $NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $ */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-1999 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* ev_streams.c - implement asynch stream file IO for the eventlib
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* vix 04mar96 [initial]
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*/
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#include <sys/cdefs.h>
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#if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
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#ifdef notdef
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static const char rcsid[] = "Id: ev_streams.c,v 1.2.206.2 2004/03/17 00:29:51 marka Exp";
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#else
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__RCSID("$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $");
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#endif
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#endif
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <isc/eventlib.h>
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#include "eventlib_p.h"
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#ifndef _LIBC
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static int copyvec(evStream *str, const struct iovec *iov, int iocnt);
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static void consume(evStream *str, size_t bytes);
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static void done(evContext opaqueCtx, evStream *str);
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static void writable(evContext opaqueCtx, void *uap, int fd, int evmask);
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static void readable(evContext opaqueCtx, void *uap, int fd, int evmask);
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#endif
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struct iovec
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evConsIovec(void *buf, size_t cnt) {
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struct iovec ret;
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memset(&ret, 0xf5, sizeof ret);
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ret.iov_base = buf;
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ret.iov_len = cnt;
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return (ret);
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}
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#ifndef _LIBC
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int
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evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
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evStreamFunc func, void *uap, evStreamID *id)
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{
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evContext_p *ctx = opaqueCtx.opaque;
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evStream *new;
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int save;
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OKNEW(new);
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new->func = func;
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new->uap = uap;
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new->fd = fd;
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new->flags = 0;
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if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0)
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goto free;
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if (copyvec(new, iov, iocnt) < 0)
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goto free;
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new->prevDone = NULL;
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new->nextDone = NULL;
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if (ctx->streams != NULL)
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ctx->streams->prev = new;
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new->prev = NULL;
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new->next = ctx->streams;
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ctx->streams = new;
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if (id != NULL)
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id->opaque = new;
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return (0);
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free:
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save = errno;
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FREE(new);
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errno = save;
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return (-1);
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}
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int
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evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
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evStreamFunc func, void *uap, evStreamID *id)
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{
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evContext_p *ctx = opaqueCtx.opaque;
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evStream *new;
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int save;
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OKNEW(new);
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new->func = func;
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new->uap = uap;
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new->fd = fd;
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new->flags = 0;
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if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0)
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goto free;
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if (copyvec(new, iov, iocnt) < 0)
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goto free;
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new->prevDone = NULL;
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new->nextDone = NULL;
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if (ctx->streams != NULL)
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ctx->streams->prev = new;
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new->prev = NULL;
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new->next = ctx->streams;
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ctx->streams = new;
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if (id)
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id->opaque = new;
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return (0);
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free:
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save = errno;
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FREE(new);
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errno = save;
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return (-1);
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}
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int
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evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ {
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evStream *str = id.opaque;
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UNUSED(opaqueCtx);
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str->timer = timer;
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str->flags |= EV_STR_TIMEROK;
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return (0);
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}
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int
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evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ {
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evStream *str = id.opaque;
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UNUSED(opaqueCtx);
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str->flags &= ~EV_STR_TIMEROK;
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return (0);
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}
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int
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evCancelRW(evContext opaqueCtx, evStreamID id) {
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evContext_p *ctx = opaqueCtx.opaque;
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evStream *old = id.opaque;
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/*
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* The streams list is doubly threaded. First, there's ctx->streams
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* that's used by evDestroy() to find and cancel all streams. Second,
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* there's ctx->strDone (head) and ctx->strLast (tail) which thread
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* through the potentially smaller number of "IO completed" streams,
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* used in evGetNext() to avoid scanning the entire list.
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*/
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/* Unlink from ctx->streams. */
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if (old->prev != NULL)
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old->prev->next = old->next;
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else
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ctx->streams = old->next;
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if (old->next != NULL)
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old->next->prev = old->prev;
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/*
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* If 'old' is on the ctx->strDone list, remove it. Update
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* ctx->strLast if necessary.
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*/
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if (old->prevDone == NULL && old->nextDone == NULL) {
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/*
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* Either 'old' is the only item on the done list, or it's
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* not on the done list. If the former, then we unlink it
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* from the list. If the latter, we leave the list alone.
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*/
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if (ctx->strDone == old) {
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ctx->strDone = NULL;
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ctx->strLast = NULL;
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}
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} else {
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if (old->prevDone != NULL)
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old->prevDone->nextDone = old->nextDone;
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else
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ctx->strDone = old->nextDone;
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if (old->nextDone != NULL)
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old->nextDone->prevDone = old->prevDone;
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else
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ctx->strLast = old->prevDone;
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}
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/* Deallocate the stream. */
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if (old->file.opaque)
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evDeselectFD(opaqueCtx, old->file);
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memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount);
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FREE(old);
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return (0);
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}
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/* Copy a scatter/gather vector and initialize a stream handler's IO. */
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static int
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copyvec(evStream *str, const struct iovec *iov, int iocnt) {
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int i;
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str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt);
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if (str->iovOrig == NULL) {
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errno = ENOMEM;
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return (-1);
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}
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str->ioTotal = 0;
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for (i = 0; i < iocnt; i++) {
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str->iovOrig[i] = iov[i];
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str->ioTotal += iov[i].iov_len;
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}
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str->iovOrigCount = iocnt;
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str->iovCur = str->iovOrig;
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str->iovCurCount = str->iovOrigCount;
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str->ioDone = 0;
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return (0);
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}
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/* Pull off or truncate lead iovec(s). */
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static void
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consume(evStream *str, size_t bytes) {
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while (bytes > 0U) {
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if (bytes < (size_t)str->iovCur->iov_len) {
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str->iovCur->iov_len -= bytes;
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str->iovCur->iov_base = (void *)
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((u_char *)str->iovCur->iov_base + bytes);
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str->ioDone += bytes;
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bytes = 0;
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} else {
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bytes -= str->iovCur->iov_len;
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str->ioDone += str->iovCur->iov_len;
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str->iovCur++;
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str->iovCurCount--;
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}
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}
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}
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/* Add a stream to Done list and deselect the FD. */
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static void
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done(evContext opaqueCtx, evStream *str) {
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evContext_p *ctx = opaqueCtx.opaque;
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if (ctx->strLast != NULL) {
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str->prevDone = ctx->strLast;
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ctx->strLast->nextDone = str;
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ctx->strLast = str;
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} else {
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INSIST(ctx->strDone == NULL);
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ctx->strDone = ctx->strLast = str;
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}
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evDeselectFD(opaqueCtx, str->file);
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str->file.opaque = NULL;
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/* evDrop() will call evCancelRW() on us. */
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}
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/* Dribble out some bytes on the stream. (Called by evDispatch().) */
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static void
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writable(evContext opaqueCtx, void *uap, int fd, int evmask) {
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evStream *str = uap;
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int bytes;
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UNUSED(evmask);
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bytes = writev(fd, str->iovCur, str->iovCurCount);
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if (bytes > 0) {
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if ((str->flags & EV_STR_TIMEROK) != 0)
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evTouchIdleTimer(opaqueCtx, str->timer);
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consume(str, bytes);
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} else {
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if (bytes < 0 && errno != EINTR) {
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str->ioDone = -1;
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str->ioErrno = errno;
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}
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}
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if (str->ioDone == -1 || str->ioDone == str->ioTotal)
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done(opaqueCtx, str);
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}
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/* Scoop up some bytes from the stream. (Called by evDispatch().) */
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static void
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readable(evContext opaqueCtx, void *uap, int fd, int evmask) {
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evStream *str = uap;
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int bytes;
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UNUSED(evmask);
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bytes = readv(fd, str->iovCur, str->iovCurCount);
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if (bytes > 0) {
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if ((str->flags & EV_STR_TIMEROK) != 0)
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evTouchIdleTimer(opaqueCtx, str->timer);
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consume(str, bytes);
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} else {
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if (bytes == 0)
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str->ioDone = 0;
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else {
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if (errno != EINTR) {
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str->ioDone = -1;
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str->ioErrno = errno;
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}
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}
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}
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if (str->ioDone <= 0 || str->ioDone == str->ioTotal)
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done(opaqueCtx, str);
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}
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#endif
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