michael@0: /*	$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $	*/
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0:  * Copyright (c) 1996-1999 by Internet Software Consortium
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /* ev_streams.c - implement asynch stream file IO for the eventlib
michael@0:  * vix 04mar96 [initial]
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #define ANDROID_CHANGES 1
michael@0: #define MOZILLA_NECKO_EXCLUDE_CODE 1
michael@0: 
michael@0: #include <sys/cdefs.h>
michael@0: #if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
michael@0: #ifdef notdef
michael@0: static const char rcsid[] = "Id: ev_streams.c,v 1.2.206.2 2004/03/17 00:29:51 marka Exp";
michael@0: #else
michael@0: __RCSID("$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $");
michael@0: #endif
michael@0: #endif
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #include <sys/uio.h>
michael@0: 
michael@0: #include <errno.h>
michael@0: 
michael@0: #include "eventlib.h"
michael@0: #include "eventlib_p.h"
michael@0: 
michael@0: #ifndef MOZILLA_NECKO_EXCLUDE_CODE
michael@0: #ifndef _LIBC
michael@0: static int	copyvec(evStream *str, const struct iovec *iov, int iocnt);
michael@0: static void	consume(evStream *str, size_t bytes);
michael@0: static void	done(evContext opaqueCtx, evStream *str);
michael@0: static void	writable(evContext opaqueCtx, void *uap, int fd, int evmask);
michael@0: static void	readable(evContext opaqueCtx, void *uap, int fd, int evmask);
michael@0: #endif
michael@0: #endif
michael@0: 
michael@0: struct iovec
michael@0: evConsIovec(void *buf, size_t cnt) {
michael@0: 	struct iovec ret;
michael@0: 
michael@0: 	memset(&ret, 0xf5, sizeof ret);
michael@0: 	ret.iov_base = buf;
michael@0: 	ret.iov_len = cnt;
michael@0: 	return (ret);
michael@0: }
michael@0: 
michael@0: #ifndef MOZILLA_NECKO_EXCLUDE_CODE
michael@0: #ifndef _LIBC
michael@0: int
michael@0: evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
michael@0: 	evStreamFunc func, void *uap, evStreamID *id)
michael@0: {
michael@0: 	evContext_p *ctx = opaqueCtx.opaque;
michael@0: 	evStream *new;
michael@0: 	int save;
michael@0: 
michael@0: 	OKNEW(new);
michael@0: 	new->func = func;
michael@0: 	new->uap = uap;
michael@0: 	new->fd = fd;
michael@0: 	new->flags = 0;
michael@0: 	if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0)
michael@0: 		goto free;
michael@0: 	if (copyvec(new, iov, iocnt) < 0)
michael@0: 		goto free;
michael@0: 	new->prevDone = NULL;
michael@0: 	new->nextDone = NULL;
michael@0: 	if (ctx->streams != NULL)
michael@0: 		ctx->streams->prev = new;
michael@0: 	new->prev = NULL;
michael@0: 	new->next = ctx->streams;
michael@0: 	ctx->streams = new;
michael@0: 	if (id != NULL)
michael@0: 		id->opaque = new;
michael@0: 	return (0);
michael@0:  free:
michael@0: 	save = errno;
michael@0: 	FREE(new);
michael@0: 	errno = save;
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: int
michael@0: evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
michael@0:        evStreamFunc func, void *uap, evStreamID *id)
michael@0: {
michael@0: 	evContext_p *ctx = opaqueCtx.opaque;
michael@0: 	evStream *new;
michael@0: 	int save;
michael@0: 
michael@0: 	OKNEW(new);
michael@0: 	new->func = func;
michael@0: 	new->uap = uap;
michael@0: 	new->fd = fd;
michael@0: 	new->flags = 0;
michael@0: 	if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0)
michael@0: 		goto free;
michael@0: 	if (copyvec(new, iov, iocnt) < 0)
michael@0: 		goto free;
michael@0: 	new->prevDone = NULL;
michael@0: 	new->nextDone = NULL;
michael@0: 	if (ctx->streams != NULL)
michael@0: 		ctx->streams->prev = new;
michael@0: 	new->prev = NULL;
michael@0: 	new->next = ctx->streams;
michael@0: 	ctx->streams = new;
michael@0: 	if (id)
michael@0: 		id->opaque = new;
michael@0: 	return (0);
michael@0:  free:
michael@0: 	save = errno;
michael@0: 	FREE(new);
michael@0: 	errno = save;
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: int
michael@0: evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ {
michael@0: 	evStream *str = id.opaque;
michael@0: 
michael@0: 	UNUSED(opaqueCtx);
michael@0: 
michael@0: 	str->timer = timer;
michael@0: 	str->flags |= EV_STR_TIMEROK;
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: int
michael@0: evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ {
michael@0: 	evStream *str = id.opaque;
michael@0: 
michael@0: 	UNUSED(opaqueCtx);
michael@0: 
michael@0: 	str->flags &= ~EV_STR_TIMEROK;
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: int
michael@0: evCancelRW(evContext opaqueCtx, evStreamID id) {
michael@0: 	evContext_p *ctx = opaqueCtx.opaque;
michael@0: 	evStream *old = id.opaque;
michael@0: 
michael@0: 	/*
michael@0: 	 * The streams list is doubly threaded.  First, there's ctx->streams
michael@0: 	 * that's used by evDestroy() to find and cancel all streams.  Second,
michael@0: 	 * there's ctx->strDone (head) and ctx->strLast (tail) which thread
michael@0: 	 * through the potentially smaller number of "IO completed" streams,
michael@0: 	 * used in evGetNext() to avoid scanning the entire list.
michael@0: 	 */
michael@0: 
michael@0: 	/* Unlink from ctx->streams. */
michael@0: 	if (old->prev != NULL)
michael@0: 		old->prev->next = old->next;
michael@0: 	else
michael@0: 		ctx->streams = old->next;
michael@0: 	if (old->next != NULL)
michael@0: 		old->next->prev = old->prev;
michael@0: 
michael@0: 	/*
michael@0: 	 * If 'old' is on the ctx->strDone list, remove it.  Update
michael@0: 	 * ctx->strLast if necessary.
michael@0: 	 */
michael@0: 	if (old->prevDone == NULL && old->nextDone == NULL) {
michael@0: 		/*
michael@0: 		 * Either 'old' is the only item on the done list, or it's
michael@0: 		 * not on the done list.  If the former, then we unlink it
michael@0: 		 * from the list.  If the latter, we leave the list alone.
michael@0: 		 */
michael@0: 		if (ctx->strDone == old) {
michael@0: 			ctx->strDone = NULL;
michael@0: 			ctx->strLast = NULL;
michael@0: 		}
michael@0: 	} else {
michael@0: 		if (old->prevDone != NULL)
michael@0: 			old->prevDone->nextDone = old->nextDone;
michael@0: 		else
michael@0: 			ctx->strDone = old->nextDone;
michael@0: 		if (old->nextDone != NULL)
michael@0: 			old->nextDone->prevDone = old->prevDone;
michael@0: 		else
michael@0: 			ctx->strLast = old->prevDone;
michael@0: 	}
michael@0: 
michael@0: 	/* Deallocate the stream. */
michael@0: 	if (old->file.opaque)
michael@0: 		evDeselectFD(opaqueCtx, old->file);
michael@0: 	memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount);
michael@0: 	FREE(old);
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /* Copy a scatter/gather vector and initialize a stream handler's IO. */
michael@0: static int
michael@0: copyvec(evStream *str, const struct iovec *iov, int iocnt) {
michael@0: 	int i;
michael@0: 
michael@0: 	str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt);
michael@0: 	if (str->iovOrig == NULL) {
michael@0: 		errno = ENOMEM;
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	str->ioTotal = 0;
michael@0: 	for (i = 0; i < iocnt; i++) {
michael@0: 		str->iovOrig[i] = iov[i];
michael@0: 		str->ioTotal += iov[i].iov_len;
michael@0: 	}
michael@0: 	str->iovOrigCount = iocnt;
michael@0: 	str->iovCur = str->iovOrig;
michael@0: 	str->iovCurCount = str->iovOrigCount;
michael@0: 	str->ioDone = 0;
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /* Pull off or truncate lead iovec(s). */
michael@0: static void
michael@0: consume(evStream *str, size_t bytes) {
michael@0: 	while (bytes > 0U) {
michael@0: 		if (bytes < (size_t)str->iovCur->iov_len) {
michael@0: 			str->iovCur->iov_len -= bytes;
michael@0: 			str->iovCur->iov_base = (void *)
michael@0: 				((u_char *)str->iovCur->iov_base + bytes);
michael@0: 			str->ioDone += bytes;
michael@0: 			bytes = 0;
michael@0: 		} else {
michael@0: 			bytes -= str->iovCur->iov_len;
michael@0: 			str->ioDone += str->iovCur->iov_len;
michael@0: 			str->iovCur++;
michael@0: 			str->iovCurCount--;
michael@0: 		}
michael@0: 	}
michael@0: }
michael@0: 
michael@0: /* Add a stream to Done list and deselect the FD. */
michael@0: static void
michael@0: done(evContext opaqueCtx, evStream *str) {
michael@0: 	evContext_p *ctx = opaqueCtx.opaque;
michael@0: 
michael@0: 	if (ctx->strLast != NULL) {
michael@0: 		str->prevDone = ctx->strLast;
michael@0: 		ctx->strLast->nextDone = str;
michael@0: 		ctx->strLast = str;
michael@0: 	} else {
michael@0: 		INSIST(ctx->strDone == NULL);
michael@0: 		ctx->strDone = ctx->strLast = str;
michael@0: 	}
michael@0: 	evDeselectFD(opaqueCtx, str->file);
michael@0: 	str->file.opaque = NULL;
michael@0: 	/* evDrop() will call evCancelRW() on us. */
michael@0: }
michael@0: 
michael@0: /* Dribble out some bytes on the stream.  (Called by evDispatch().) */
michael@0: static void
michael@0: writable(evContext opaqueCtx, void *uap, int fd, int evmask) {
michael@0: 	evStream *str = uap;
michael@0: 	int bytes;
michael@0: 
michael@0: 	UNUSED(evmask);
michael@0: 
michael@0: 	bytes = writev(fd, str->iovCur, str->iovCurCount);
michael@0: 	if (bytes > 0) {
michael@0: 		if ((str->flags & EV_STR_TIMEROK) != 0)
michael@0: 			evTouchIdleTimer(opaqueCtx, str->timer);
michael@0: 		consume(str, bytes);
michael@0: 	} else {
michael@0: 		if (bytes < 0 && errno != EINTR) {
michael@0: 			str->ioDone = -1;
michael@0: 			str->ioErrno = errno;
michael@0: 		}
michael@0: 	}
michael@0: 	if (str->ioDone == -1 || str->ioDone == str->ioTotal)
michael@0: 		done(opaqueCtx, str);
michael@0: }
michael@0: 
michael@0: /* Scoop up some bytes from the stream.  (Called by evDispatch().) */
michael@0: static void
michael@0: readable(evContext opaqueCtx, void *uap, int fd, int evmask) {
michael@0: 	evStream *str = uap;
michael@0: 	int bytes;
michael@0: 
michael@0: 	UNUSED(evmask);
michael@0: 
michael@0: 	bytes = readv(fd, str->iovCur, str->iovCurCount);
michael@0: 	if (bytes > 0) {
michael@0: 		if ((str->flags & EV_STR_TIMEROK) != 0)
michael@0: 			evTouchIdleTimer(opaqueCtx, str->timer);
michael@0: 		consume(str, bytes);
michael@0: 	} else {
michael@0: 		if (bytes == 0)
michael@0: 			str->ioDone = 0;
michael@0: 		else {
michael@0: 			if (errno != EINTR) {
michael@0: 				str->ioDone = -1;
michael@0: 				str->ioErrno = errno;
michael@0: 			}
michael@0: 		}
michael@0: 	}
michael@0: 	if (str->ioDone <= 0 || str->ioDone == str->ioTotal)
michael@0: 		done(opaqueCtx, str);
michael@0: }
michael@0: #endif
michael@0: #endif