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9gc: exit when stdin is broken; print \r before every message is sent

--- a/9gc.c

+++ b/9gc.c

@@ -352,10 +352,13 @@

 		for (;;) {

 			if ((n = read(0, s+sz, sizeof(a->rdbuf)-sz)) > 0)

 				sz += n;

+			else

+				exit(0);

 			if (s[sz-1] != '\n'){

 				s[sz-1] = '\n';

 			}else{

 				c9write(ctx, &tag, Chatfid, 0, s, sz);

+				write(1, "\r", 1);

 				break;

 			}

 		}