Import tmux, a terminal multiplexor allowing (among other things) a single

terminal to be switched between several different windows and programs
displayed on one terminal be detached from one terminal and moved to another.

ok deraadt pirofti

1 files changed, 97 insertions, 0 deletions

diff --git a/usr.bin/tmux/buffer-poll.c b/usr.bin/tmux/buffer-poll.c
new file mode 100644
index 00000000000..dc6507a5e38
--- /dev/null
+++ b/usr.bin/tmux/buffer-poll.c
@@ -0,0 +1,97 @@
+/* $OpenBSD: buffer-poll.c,v 1.1 2009/06/01 22:58:49 nicm Exp $ */
+
+/*
+ * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, 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.
+ */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "tmux.h"
+
+/* Set up pollfd for buffers. */
+void
+buffer_set(
+    struct pollfd *pfd, int fd, unused struct buffer *in, struct buffer *out)
+{
+	pfd->fd = fd;
+	pfd->events = POLLIN;
+	if (BUFFER_USED(out) > 0)
+		pfd->events |= POLLOUT;
+}
+
+/* Fill buffers from socket based on poll results. */
+int
+buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
+{
+	ssize_t	n;
+
+#if 0
+	log_debug("buffer_poll (%ld): fd=%d, revents=%d; out=%zu in=%zu",
+	    (long) getpid(),
+	    pfd->fd, pfd->revents, BUFFER_USED(out), BUFFER_USED(in));
+#endif
+
+	if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
+		return (-1);
+	if (pfd->revents & POLLIN) {
+		buffer_ensure(in, BUFSIZ);
+		n = read(pfd->fd, BUFFER_IN(in), BUFFER_FREE(in));
+#if 0
+		log_debug("buffer_poll: fd=%d, read=%zd", pfd->fd, n);
+#endif
+		if (n == 0)
+			return (-1);
+		if (n == -1) {
+			if (errno != EINTR && errno != EAGAIN)
+				return (-1);
+		} else
+			buffer_add(in, n);
+	}
+	if (BUFFER_USED(out) > 0 && pfd->revents & POLLOUT) {
+		n = write(pfd->fd, BUFFER_OUT(out), BUFFER_USED(out));
+#if 0
+		log_debug("buffer_poll: fd=%d, write=%zd", pfd->fd, n);
+#endif
+		if (n == -1) {
+			if (errno != EINTR && errno != EAGAIN)
+				return (-1);
+		} else
+			buffer_remove(out, n);
+	}
+	return (0);
+}
+
+/* Flush buffer output to socket. */
+void
+buffer_flush(int fd, struct buffer *in, struct buffer *out)
+{
+	struct pollfd	pfd;
+
+	while (BUFFER_USED(out) > 0) {
+		buffer_set(&pfd, fd, in, out);
+
+		if (poll(&pfd, 1, INFTIM) == -1) {
+			if (errno == EAGAIN || errno == EINTR)
+				continue;
+			fatal("poll failed");
+		}
+
+		if (buffer_poll(&pfd, in, out) != 0)
+			break;
+	}
+}