Initial Contribution
diff --git a/libc/netbsd/isc/ev_streams.c b/libc/netbsd/isc/ev_streams.c
new file mode 100644
index 0000000..aeecc3e
--- /dev/null
+++ b/libc/netbsd/isc/ev_streams.c
@@ -0,0 +1,311 @@
+/* $NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $ */
+
+/*
+ * 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]
+ */
+
+#include <sys/cdefs.h>
+#if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
+#ifdef notdef
+static const char rcsid[] = "Id: ev_streams.c,v 1.2.206.2 2004/03/17 00:29:51 marka Exp";
+#else
+__RCSID("$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $");
+#endif
+#endif
+
+#include <sys/types.h>
+#include <sys/uio.h>
+
+#include <errno.h>
+
+#include <isc/eventlib.h>
+#include "eventlib_p.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