Improve error reporting in non-blocking write code

common.c

@@ -647,9 +647,10 @@ ssize_t non_blocking_write(int fd, const void *buf, size_t count) {
       // debug(1, "non-blocking write error waiting for pipe to become ready for writing...");
     } else if (rc == 0) {
       // warn("non-blocking write timeout waiting for pipe to become ready for writing");
-      rc = -2;
+      rc = -1;
+      errno = -ETIME;
     } else { // rc > 0, implying it might be ready
-      size_t bytes_written = write(fd, ibuf, bytes_remaining);
+      ssize_t bytes_written = write(fd, ibuf, bytes_remaining);
       if (bytes_written == -1) {
         // debug(1,"Error %d in non_blocking_write: \"%s\".",errno,strerror(errno));
         rc = -1;