Re: [uml-devel] ]PATCH 3.03 1/1] um: VDE backend needs to handle EINTR/EAGAIN

[Frank Laub <frank.laub@gmail.com>]

Handle EINTR and EAGAIN during vde_send() and vde_recv() in case the VDE library doesn't. Use the same approach that net_user.c takes.

Signed-off-by: Frank Laub<flaub@anomali.es>

--- a/arch/um/drivers/vde_user.c
+++ b/arch/um/drivers/vde_user.c
@@ -11,6 +11,7 @@
  #include "um_malloc.h"
  #include "user.h"
  #include "vde.h"
+#include "os.h"

  static int vde_user_init(void *data, void *dev)
  {
@@ -103,7 +104,7 @@ int vde_user_read(void *conn, void *buf,
      if (vconn == NULL)
          return 0;

-    rv = vde_recv(vconn, buf, len, 0);
+    CATCH_EINTR(rv = vde_recv(vconn, buf, len, 0));
      if (rv < 0) {
          if (errno == EAGAIN)
              return 0;
@@ -118,10 +119,17 @@ int vde_user_read(void *conn, void *buf,
  int vde_user_write(void *conn, void *buf, int len)
  {
      VDECONN *vconn = conn;
+    int rv;

      if (vconn == NULL)
          return 0;

-    return vde_send(vconn, buf, len, 0);
+    CATCH_EINTR(rv = vde_send(vconn, buf, len, 0));
+    if (rv < 0) {
+        if (errno == EAGAIN)
+            return 0;
+        return -errno;
+    }
+    return rv;
  }


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