1 files changed, 318 insertions, 0 deletions
diff --git a/lib/libc/isc/ev_streams.c b/lib/libc/isc/ev_streams.c
new file mode 100644
index 0000000..06bdfad
--- /dev/null
+++ b/lib/libc/isc/ev_streams.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996-1999 by Internet Software Consortium
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* ev_streams.c - implement asynch stream file IO for the eventlib
+ * vix 04mar96 [initial]
+ */
+
+#if !defined(LINT) && !defined(CODECENTER)
+static const char rcsid[] = "$Id: ev_streams.c,v 1.4.18.1 2005/04/27 05:01:06 sra Exp $";
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "port_before.h"
+#ifndef _LIBC
+#include "fd_setsize.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/uio.h>
+
+#include <errno.h>
+
+#include <isc/eventlib.h>
+#ifndef _LIBC
+#include <isc/assertions.h>
+#endif
+#include "eventlib_p.h"
+
+#include "port_after.h"
+
+#ifndef _LIBC
+static int	copyvec(evStream *str, const struct iovec *iov, int iocnt);
+static void	consume(evStream *str, size_t bytes);
+static void	done(evContext opaqueCtx, evStream *str);
+static void	writable(evContext opaqueCtx, void *uap, int fd, int evmask);
+static void	readable(evContext opaqueCtx, void *uap, int fd, int evmask);
+#endif
+
+struct iovec
+evConsIovec(void *buf, size_t cnt) {
+	struct iovec ret;
+
+	memset(&ret, 0xf5, sizeof ret);
+	ret.iov_base = buf;
+	ret.iov_len = cnt;
+	return (ret);
+}
+
+#ifndef _LIBC
+int
+evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
+	evStreamFunc func, void *uap, evStreamID *id)
+{
+	evContext_p *ctx = opaqueCtx.opaque;
+	evStream *new;
+	int save;
+
+	OKNEW(new);
+	new->func = func;
+	new->uap = uap;
+	new->fd = fd;
+	new->flags = 0;
+	if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0)
+		goto free;
+	if (copyvec(new, iov, iocnt) < 0)
+		goto free;
+	new->prevDone = NULL;
+	new->nextDone = NULL;
+	if (ctx->streams != NULL)
+		ctx->streams->prev = new;
+	new->prev = NULL;
+	new->next = ctx->streams;
+	ctx->streams = new;
+	if (id != NULL)
+		id->opaque = new;
+	return (0);
+ free:
+	save = errno;
+	FREE(new);
+	errno = save;
+	return (-1);
+}
+
+int
+evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
+       evStreamFunc func, void *uap, evStreamID *id)
+{
+	evContext_p *ctx = opaqueCtx.opaque;
+	evStream *new;
+	int save;
+
+	OKNEW(new);
+	new->func = func;
+	new->uap = uap;
+	new->fd = fd;
+	new->flags = 0;
+	if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0)
+		goto free;
+	if (copyvec(new, iov, iocnt) < 0)
+		goto free;
+	new->prevDone = NULL;
+	new->nextDone = NULL;
+	if (ctx->streams != NULL)
+		ctx->streams->prev = new;
+	new->prev = NULL;
+	new->next = ctx->streams;
+	ctx->streams = new;
+	if (id)
+		id->opaque = new;
+	return (0);
+ free:
+	save = errno;
+	FREE(new);
+	errno = save;
+	return (-1);
+}
+
+int
+evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ {
+	evStream *str = id.opaque;
+
+	UNUSED(opaqueCtx);
+
+	str->timer = timer;
+	str->flags |= EV_STR_TIMEROK;
+	return (0);
+}
+
+int
+evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ {
+	evStream *str = id.opaque;
+
+	UNUSED(opaqueCtx);
+
+	str->flags &= ~EV_STR_TIMEROK;
+	return (0);
+}
+
+int
+evCancelRW(evContext opaqueCtx, evStreamID id) {
+	evContext_p *ctx = opaqueCtx.opaque;
+	evStream *old = id.opaque;
+
+	/*
+	 * The streams list is doubly threaded.  First, there's ctx->streams
+	 * that's used by evDestroy() to find and cancel all streams.  Second,
+	 * there's ctx->strDone (head) and ctx->strLast (tail) which thread
+	 * through the potentially smaller number of "IO completed" streams,
+	 * used in evGetNext() to avoid scanning the entire list.
+	 */
+
+	/* Unlink from ctx->streams. */
+	if (old->prev != NULL)
+		old->prev->next = old->next;
+	else
+		ctx->streams = old->next;
+	if (old->next != NULL)
+		old->next->prev = old->prev;
+
+	/*
+	 * If 'old' is on the ctx->strDone list, remove it.  Update
+	 * ctx->strLast if necessary.
+	 */
+	if (old->prevDone == NULL && old->nextDone == NULL) {
+		/*
+		 * Either 'old' is the only item on the done list, or it's
+		 * not on the done list.  If the former, then we unlink it
+		 * from the list.  If the latter, we leave the list alone.
+		 */
+		if (ctx->strDone == old) {
+			ctx->strDone = NULL;
+			ctx->strLast = NULL;
+		}
+	} else {
+		if (old->prevDone != NULL)
+			old->prevDone->nextDone = old->nextDone;
+		else
+			ctx->strDone = old->nextDone;
+		if (old->nextDone != NULL)
+			old->nextDone->prevDone = old->prevDone;
+		else
+			ctx->strLast = old->prevDone;
+	}
+
+	/* Deallocate the stream. */
+	if (old->file.opaque)
+		evDeselectFD(opaqueCtx, old->file);
+	memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount);
+	FREE(old);
+	return (0);
+}
+
+/* Copy a scatter/gather vector and initialize a stream handler's IO. */
+static int
+copyvec(evStream *str, const struct iovec *iov, int iocnt) {
+	int i;
+
+	str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt);
+	if (str->iovOrig == NULL) {
+		errno = ENOMEM;
+		return (-1);
+	}
+	str->ioTotal = 0;
+	for (i = 0; i < iocnt; i++) {
+		str->iovOrig[i] = iov[i];
+		str->ioTotal += iov[i].iov_len;
+	}
+	str->iovOrigCount = iocnt;
+	str->iovCur = str->iovOrig;
+	str->iovCurCount = str->iovOrigCount;
+	str->ioDone = 0;
+	return (0);
+}
+
+/* Pull off or truncate lead iovec(s). */
+static void
+consume(evStream *str, size_t bytes) {
+	while (bytes > 0U) {
+		if (bytes < (size_t)str->iovCur->iov_len) {
+			str->iovCur->iov_len -= bytes;
+			str->iovCur->iov_base = (void *)
+				((u_char *)str->iovCur->iov_base + bytes);
+			str->ioDone += bytes;
+			bytes = 0;
+		} else {
+			bytes -= str->iovCur->iov_len;
+			str->ioDone += str->iovCur->iov_len;
+			str->iovCur++;
+			str->iovCurCount--;
+		}
+	}
+}
+
+/* Add a stream to Done list and deselect the FD. */
+static void
+done(evContext opaqueCtx, evStream *str) {
+	evContext_p *ctx = opaqueCtx.opaque;
+
+	if (ctx->strLast != NULL) {
+		str->prevDone = ctx->strLast;
+		ctx->strLast->nextDone = str;
+		ctx->strLast = str;
+	} else {
+		INSIST(ctx->strDone == NULL);
+		ctx->strDone = ctx->strLast = str;
+	}
+	evDeselectFD(opaqueCtx, str->file);
+	str->file.opaque = NULL;
+	/* evDrop() will call evCancelRW() on us. */
+}
+
+/* Dribble out some bytes on the stream.  (Called by evDispatch().) */
+static void
+writable(evContext opaqueCtx, void *uap, int fd, int evmask) {
+	evStream *str = uap;
+	int bytes;
+
+	UNUSED(evmask);
+
+	bytes = writev(fd, str->iovCur, str->iovCurCount);
+	if (bytes > 0) {
+		if ((str->flags & EV_STR_TIMEROK) != 0)
+			evTouchIdleTimer(opaqueCtx, str->timer);
+		consume(str, bytes);
+	} else {
+		if (bytes < 0 && errno != EINTR) {
+			str->ioDone = -1;
+			str->ioErrno = errno;
+		}
+	}
+	if (str->ioDone == -1 || str->ioDone == str->ioTotal)
+		done(opaqueCtx, str);
+}
+
+/* Scoop up some bytes from the stream.  (Called by evDispatch().) */
+static void
+readable(evContext opaqueCtx, void *uap, int fd, int evmask) {
+	evStream *str = uap;
+	int bytes;
+
+	UNUSED(evmask);
+
+	bytes = readv(fd, str->iovCur, str->iovCurCount);
+	if (bytes > 0) {
+		if ((str->flags & EV_STR_TIMEROK) != 0)
+			evTouchIdleTimer(opaqueCtx, str->timer);
+		consume(str, bytes);
+	} else {
+		if (bytes == 0)
+			str->ioDone = 0;
+		else {
+			if (errno != EINTR) {
+				str->ioDone = -1;
+				str->ioErrno = errno;
+			}
+		}
+	}
+	if (str->ioDone <= 0 || str->ioDone == str->ioTotal)
+		done(opaqueCtx, str);
+}
+#endif
+
+/*! \file */