1 files changed, 39 insertions, 0 deletions
diff --git a/support/xwrite.c b/support/xwrite.c
new file mode 100644
index 0000000000..452359e4ad
--- /dev/null
+++ b/support/xwrite.c
@@ -0,0 +1,39 @@
+/* write with error checking and retries.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/xunistd.h>
+
+#include <support/check.h>
+
+void
+xwrite (int fd, const void *buffer, size_t length)
+{
+  const char *p = buffer;
+  const char *end = p + length;
+  while (p < end)
+    {
+      ssize_t ret = write (fd, p, end - p);
+      if (ret < 0)
+        FAIL_EXIT1 ("write of %zu bytes failed after %zd: %m",
+                    length, p - (const char *) buffer);
+      if (ret == 0)
+        FAIL_EXIT1 ("write return 0 after writing %zd bytes of %zu",
+                    p - (const char *) buffer, length);
+      p += ret;
+    }
+}