[PATCH v2 2/3] libxl: check for underlying xenstore operation failure...

[Paul Durrant <paul.durrant@citrix.com>]

...in libxl__xs_writev_perms() and libxl__xs_printf()

ERROR_FAIL is returned when any underlying operation fails. This is a
semantic change in the case of a vasprintf() failure in libxl__xs_printf(),
but appears to be better than returning a hardcoded -1.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
 tools/libxl/libxl_xshelp.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/tools/libxl/libxl_xshelp.c b/tools/libxl/libxl_xshelp.c
index 3cac4f2..a178039 100644
--- a/tools/libxl/libxl_xshelp.c
+++ b/tools/libxl/libxl_xshelp.c
@@ -57,9 +57,11 @@ int libxl__xs_writev_perms(libxl__gc *gc, xs_transaction_t t,
         path = libxl__sprintf(gc, "%s/%s", dir, kvs[i]);
         if (path && kvs[i + 1]) {
             int length = strlen(kvs[i + 1]);
-            xs_write(ctx->xsh, t, path, kvs[i + 1], length);
-            if (perms)
-                xs_set_permissions(ctx->xsh, t, path, perms, num_perms);
+            if (!xs_write(ctx->xsh, t, path, kvs[i + 1], length))
+                return ERROR_FAIL;
+            if (perms &&
+                !xs_set_permissions(ctx->xsh, t, path, perms, num_perms))
+                return ERROR_FAIL;
         }
     }
     return 0;
@@ -108,11 +110,10 @@ int libxl__xs_printf(libxl__gc *gc, xs_transaction_t t,
     va_end(ap);
 
     if (ret == -1) {
-        return -1;
+        return ERROR_FAIL;
     }
-    xs_write(ctx->xsh, t, path, s, ret);
-    free(s);
-    return 0;
+    libxl__ptr_add(gc, s);
+    return xs_write(ctx->xsh, t, path, s, ret) ? 0 : ERROR_FAIL;
 }
 
 char * libxl__xs_read(libxl__gc *gc, xs_transaction_t t, const char *path)
-- 
2.1.4