ustream-fd: retry partial writes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/ustream-fd.c b/ustream-fd.c
index a47ff9430a1d3cda85e858f0c0ab771ffb9d77bd..a2527080ad44bf7ae2f3a51986da3b6aed162b4f 100644 (file)
--- a/ustream-fd.c
+++ b/ustream-fd.c
@@ -83,28 +83,33 @@ static void ustream_fd_read_pending(struct ustream_fd *sf, bool *more)
 static int ustream_fd_write(struct ustream *s, const char *buf, int buflen, bool more)
 {
        struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
-       ssize_t len;
+       ssize_t ret = 0, len;
 
        if (!buflen)
                return 0;
 
-retry:
-       len = write(sf->fd.fd, buf, buflen);
-       if (!len)
-               goto retry;
+       while (buflen) {
+               len = write(sf->fd.fd, buf, buflen);
+
+               if (len < 0) {
+                       if (errno == EINTR)
+                               continue;
+
+                       if (errno == EAGAIN || errno == EWOULDBLOCK)
+                               break;
 
-       if (len < 0) {
-               if (errno == EINTR)
-                       goto retry;
+                       return -1;
+               }
 
-               if (errno == EAGAIN || errno == EWOULDBLOCK)
-                       len = 0;
+               ret += len;
+               buf += len;
+               buflen -= len;
        }
 
-       if (len >= 0 && len < buflen)
+       if (buflen)
                ustream_fd_set_uloop(s, true);
 
-       return len;
+       return ret;
 }
 
 static bool __ustream_fd_poll(struct ustream_fd *sf, unsigned int events)