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9gc: do a dummy read each 10 second of inactivity, hoping for Android to not close the socket

--- a/9gc.c

+++ b/9gc.c

@@ -322,6 +322,7 @@

 static int

 chatrw(C9aux *a)

 {

+	struct timeval t;

 	fd_set r, e;

 	int n, sz;

 	C9tag tag;

@@ -334,9 +335,11 @@

 	FD_ZERO(&e);

 	FD_SET(a->f, &e);

 	FD_SET(0, &e);

+	memset(&t, 0, sizeof(t));

+	t.tv_sec = 10;

 	for (;;) {

 		errno = 0;

-		if ((n = select(a->f + 1, &r, NULL, &e, NULL)) < 0 || FD_ISSET(a->f, &e) || FD_ISSET(0, &e)) {

+		if ((n = select(a->f + 1, &r, NULL, &e, &t)) < 0 || FD_ISSET(a->f, &e) || FD_ISSET(0, &e)) {

 			if (errno == EINTR)

 				continue;

 			return -1;

@@ -345,9 +348,9 @@

 	}

 	ctx = (C9ctx*)a;

-	if (FD_ISSET(a->f, &r))

+	if (FD_ISSET(a->f, &r)) {

 		c9proc(ctx);

-	if (FD_ISSET(0, &r)) {

+	} else if (FD_ISSET(0, &r)) {

 		s = (char*)a->rdbuf;

 		sz = sprintf(s, "%s → ", nick);

 		for (;;) {

@@ -362,6 +365,8 @@

 				break;

 			}

 		}

+	} else {

+		c9read(ctx, &tag, Chatfid, 0, 0);

 	}

 	return 0;