+/*
+ * ret: Negative on errors, zero if nothing was written and write returned
+ * EAGAIN, number of bytes written else.
+ */
+static int http_write(int fd, const char *buf, size_t len)
+{
+ size_t written = 0;
+
+ while (written < len) {
+ int ret = write(fd, buf + written, len - written);
+ if (ret < 0 && errno == EAGAIN)
+ return written;
+ if (ret < 0)
+ return -ERRNO_TO_PARA_ERROR(errno);
+ written += ret;
+ }
+ return written;
+}
+
+