1 files changed, 316 insertions, 0 deletions
diff --git a/contrib/bind/lib/isc/ev_connects.c b/contrib/bind/lib/isc/ev_connects.c
new file mode 100644
index 0000000..1cf7291
--- /dev/null
+++ b/contrib/bind/lib/isc/ev_connects.c
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 1995, 1996, 1997, 1998 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM 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_connects.c - implement asynch connect/accept for the eventlib
+ * vix 16sep96 [initial]
+ */
+
+#if !defined(LINT) && !defined(CODECENTER)
+static const char rcsid[] = "$Id: ev_connects.c,v 8.19 1998/03/20 23:26:22 halley Exp $";
+#endif
+
+/* Import. */
+
+#include "port_before.h"
+#include "fd_setsize.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <unistd.h>
+
+#include <isc/eventlib.h>
+#include <isc/assertions.h>
+#include "eventlib_p.h"
+
+#include "port_after.h"
+
+/* Forward. */
+
+static void	listener(evContext ctx, void *uap, int fd, int evmask);
+static void	connector(evContext ctx, void *uap, int fd, int evmask);
+
+/* Public. */
+
+int
+evListen(evContext opaqueCtx, int fd, int maxconn,
+	 evConnFunc func, void *uap, evConnID *id)
+{
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *new;
+	int mode;
+
+	OKNEW(new);
+	new->flags = EV_CONN_LISTEN;
+	OK(mode = fcntl(fd, F_GETFL, NULL));	/* side effect: validate fd. */
+	/*
+	 * Remember the nonblocking status.  We assume that either evSelectFD
+	 * has not been done to this fd, or that if it has then the caller
+	 * will evCancelConn before they evDeselectFD.  If our assumptions
+	 * are not met, then we might restore the old nonblocking status
+	 * incorrectly.
+	 */
+	if ((mode & O_NONBLOCK) == 0) {
+		OK(fcntl(fd, F_SETFL, mode | O_NONBLOCK));
+		new->flags |= EV_CONN_BLOCK;
+	}
+	OK(listen(fd, maxconn));
+	if (evSelectFD(opaqueCtx, fd, EV_READ, listener, new, &new->file) < 0){
+		int save = errno;
+
+		FREE(new);
+		errno = save;
+		return (-1);
+	}
+	new->flags |= EV_CONN_SELECTED;
+	new->func = func;
+	new->uap = uap;
+	new->fd = fd;
+	if (ctx->conns != NULL)
+		ctx->conns->prev = new;
+	new->prev = NULL;
+	new->next = ctx->conns;
+	ctx->conns = new;
+	if (id)
+		id->opaque = new;
+	return (0);
+}
+
+int
+evConnect(evContext opaqueCtx, int fd, void *ra, int ralen,
+	  evConnFunc func, void *uap, evConnID *id)
+{
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *new;
+
+	OKNEW(new);
+	new->flags = 0;
+	/* Do the select() first to get the socket into nonblocking mode. */
+	if (evSelectFD(opaqueCtx, fd, EV_MASK_ALL,
+		       connector, new, &new->file) < 0) {
+		int save = errno;
+
+		FREE(new);
+		errno = save;
+		return (-1);
+	}
+	new->flags |= EV_CONN_SELECTED;
+	if (connect(fd, ra, ralen) < 0 &&
+	    errno != EWOULDBLOCK &&
+	    errno != EAGAIN &&
+	    errno != EINPROGRESS) {
+		int save = errno;
+
+		(void) evDeselectFD(opaqueCtx, new->file);
+		FREE(new);
+		errno = save;
+		return (-1);
+	}
+	/* No error, or EWOULDBLOCK.  select() tells when it's ready. */
+	new->func = func;
+	new->uap = uap;
+	new->fd = fd;
+	if (ctx->conns != NULL)
+		ctx->conns->prev = new;
+	new->prev = NULL;
+	new->next = ctx->conns;
+	ctx->conns = new;
+	if (id)
+		id->opaque = new;
+	return (0);
+}
+
+int
+evCancelConn(evContext opaqueCtx, evConnID id) {
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *this = id.opaque;
+	evAccept *acc, *nxtacc;
+	int mode;
+
+	if ((this->flags & EV_CONN_SELECTED) != 0)
+		(void) evDeselectFD(opaqueCtx, this->file);
+	if ((this->flags & EV_CONN_BLOCK) != 0) {
+		mode = fcntl(this->fd, F_GETFL, NULL);
+		if (mode == -1) {
+			if (errno != EBADF)
+				return (-1);
+		} else
+			OK(fcntl(this->fd, F_SETFL, mode | O_NONBLOCK));
+	}
+	
+	/* Unlink from ctx->conns. */
+	if (this->prev != NULL)
+		this->prev->next = this->next;
+	else
+		ctx->conns = this->next;
+	if (this->next != NULL)
+		this->next->prev = this->prev;
+
+	/*
+	 * Remove `this' from the ctx->accepts list (zero or more times).
+	 */
+	for (acc = HEAD(ctx->accepts), nxtacc = NULL;
+	     acc != NULL;
+	     acc = nxtacc)
+	{
+		nxtacc = NEXT(acc, link);
+		if (acc->conn == this) {
+			UNLINK(ctx->accepts, acc, link);
+			close(acc->fd);
+			FREE(acc);
+		}
+	}
+
+	/* Wrap up and get out. */
+	FREE(this);
+	return (0);
+}
+
+int evHold(evContext opaqueCtx, evConnID id) {
+	evConn *this = id.opaque;
+
+	if ((this->flags & EV_CONN_LISTEN) == 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if ((this->flags & EV_CONN_SELECTED) == 0)
+		return (0);
+	this->flags &= ~EV_CONN_SELECTED;
+	return (evDeselectFD(opaqueCtx, this->file));
+}
+
+int evUnhold(evContext opaqueCtx, evConnID id) {
+	evConn *this = id.opaque;
+	int ret;
+
+	if ((this->flags & EV_CONN_LISTEN) == 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if ((this->flags & EV_CONN_SELECTED) != 0)
+		return (0);
+	ret = evSelectFD(opaqueCtx, this->fd, EV_READ, listener, this,
+			 &this->file);
+	if (ret == 0)
+		this->flags |= EV_CONN_SELECTED;
+	return (ret);
+}
+
+int
+evTryAccept(evContext opaqueCtx, evConnID id, int *sys_errno) {
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *conn = id.opaque;
+	evAccept *new;
+
+	if ((conn->flags & EV_CONN_LISTEN) == 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	OKNEW(new);
+	new->conn = conn;
+	new->ralen = sizeof new->ra;
+	new->fd = accept(conn->fd, &new->ra, &new->ralen);
+	if (new->fd >= 0) {
+		new->lalen = sizeof new->la;
+		if (getsockname(new->fd, &new->la, &new->lalen) < 0) {
+			new->ioErrno = errno;
+			(void) close(new->fd);
+			new->fd = -1;
+		} else
+			new->ioErrno = 0;
+	} else {
+		new->ioErrno = errno;
+		if (errno == EAGAIN || errno == EWOULDBLOCK) {
+			FREE(new);
+			return (-1);
+		}
+	}
+	APPEND(ctx->accepts, new, link);
+	*sys_errno = new->ioErrno;
+	return (0);
+}
+
+/* Private. */
+
+static void
+listener(evContext opaqueCtx, void *uap, int fd, int evmask) {
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *conn = uap;
+	struct sockaddr la, ra;
+	int new, lalen, ralen;
+
+	REQUIRE((evmask & EV_READ) != 0);
+	ralen = sizeof ra;
+	new = accept(fd, &ra, &ralen);
+	if (new >= 0) {
+		lalen = sizeof la;
+		if (getsockname(new, &la, &lalen) < 0) {
+			int save = errno;
+
+			(void) close(new);
+			errno = save;
+			new = -1;
+		}
+	} else if (errno == EAGAIN || errno == EWOULDBLOCK)
+		return;
+	(*conn->func)(opaqueCtx, conn->uap, new, &la, lalen, &ra, ralen);
+}
+
+static void
+connector(evContext opaqueCtx, void *uap, int fd, int evmask) {
+	evContext_p *ctx = opaqueCtx.opaque;
+	evConn *conn = uap;
+	struct sockaddr la, ra;
+	int lalen, ralen;
+	char buf[1];
+	void *conn_uap;
+	evConnFunc conn_func;
+	evConnID id;
+	int socket_errno = 0;
+	int optlen;
+
+	lalen = sizeof la;
+	ralen = sizeof ra;
+	conn_uap = conn->uap;
+	conn_func = conn->func;
+	id.opaque = conn;
+#ifdef SO_ERROR
+	optlen = sizeof socket_errno;
+	if (fd < 0 &&
+	    getsockopt(conn->fd, SOL_SOCKET, SO_ERROR, (char *)&socket_errno,
+		       &optlen) < 0)
+		socket_errno = errno;
+	else
+		errno = socket_errno;
+#endif
+	if (evCancelConn(opaqueCtx, id) < 0 ||
+	    socket_errno ||
+#ifdef NETREAD_BROKEN
+	    0 ||
+#else
+	    read(fd, buf, 0) < 0 ||
+#endif
+	    getsockname(fd, &la, &lalen) < 0 ||
+	    getpeername(fd, &ra, &ralen) < 0) {
+		int save = errno;
+
+		(void) close(fd);	/* XXX closing caller's fd */
+		errno = save;
+		fd = -1;
+	}
+	(*conn_func)(opaqueCtx, conn_uap, fd, &la, lalen, &ra, ralen);
+}