Index: tls_read.3
===================================================================
RCS file: /cvs/src/lib/libtls/man/tls_read.3,v
diff -u -p -r1.7 tls_read.3
--- tls_read.3	9 Jul 2019 17:58:33 -0000	1.7
+++ tls_read.3	8 May 2024 00:26:10 -0000
@@ -92,12 +92,15 @@ After closing the connection,
 .Fa ctx
 can be passed to
 .Xr tls_free 3 .
+.Fn tls_close
+is safe to call if the underlying socket is no longer connected.
 .\" XXX Fn tls_reset does what?
 .Sh RETURN VALUES
 .Fn tls_read
 and
 .Fn tls_write
-return a size on success or -1 on error.
+return -1 on error, 0 if the underlying socket is disconnected, or
+a size on success.
 .Pp
 .Fn tls_handshake
 and
@@ -165,6 +168,8 @@ while (len > 0) {
 		continue;
 	if (ret == -1)
 		errx(1, "tls_write: %s", tls_error(ctx));
+	if (ret == 0)
+		errx(1, "tls_write: socket disconnected");
 	buf += ret;
 	len -= ret;
 }
@@ -179,7 +184,7 @@ non-blocking file descriptor using
 pfd[0].fd = fd;
 pfd[0].events = POLLIN|POLLOUT;
 while (len > 0) {
-	nready = poll(pfd, 1, 0);
+	nready = poll(pfd, 1, INFTIM);
 	if (nready == -1)
 		err(1, "poll");
 	if ((pfd[0].revents & (POLLERR|POLLNVAL)))
@@ -194,6 +199,8 @@ while (len > 0) {
 			pfd[0].events = POLLOUT;
 		else if (ret == -1)
 			errx(1, "tls_write: %s", tls_error(ctx));
+		else if (ret == 0)
+			errx(1, "tls_write: socket disconnected");
 		else {
 			buf += ret;
 			len -= ret;