hurd: Add missing fcntl-internal.h

	* hurd/fcntl-internal.h: New file.

1 files changed, 62 insertions, 0 deletions

diff --git a/hurd/fcntl-internal.h b/hurd/fcntl-internal.h
new file mode 100644
index 0000000000..d795e4089c
--- /dev/null
+++ b/hurd/fcntl-internal.h
@@ -0,0 +1,62 @@
+/* Helper functions for translating between O_* and SOCK_* flags.
+   Copyright (C) 2008-2018 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
+   <https://www.gnu.org/licenses/>.  */
+
+
+#include <fcntl.h>
+#include <sys/socket.h>
+
+/* Do some compile-time checks for the SOCK_* constants, which we rely on.  */
+_Static_assert (SOCK_CLOEXEC == O_CLOEXEC,
+    "SOCK_CLOEXEC is assumed to be the same as O_CLOEXEC");
+_Static_assert (((SOCK_MAX - 1) | SOCK_TYPE_MASK) == SOCK_TYPE_MASK,
+    "SOCK_TYPE_MASK must contain SOCK_MAX - 1");
+_Static_assert ((SOCK_CLOEXEC & SOCK_TYPE_MASK) == 0,
+    "SOCK_TYPE_MASK must not contain SOCK_CLOEXEC");
+_Static_assert ((SOCK_NONBLOCK & SOCK_TYPE_MASK) == 0,
+    "SOCK_TYPE_MASK must not contain SOCK_NONBLOCK");
+
+
+/* Convert from SOCK_* flags to O_* flags.  */
+__extern_always_inline
+int
+sock_to_o_flags (int in)
+{
+  int out = 0;
+
+  if (in & SOCK_NONBLOCK)
+    out |= O_NONBLOCK;
+  /* Others are passed through unfiltered.  */
+  out |= in & ~(SOCK_NONBLOCK);
+
+  return out;
+}
+
+/* Convert from O_* flags to SOCK_* flags.  */
+__extern_always_inline
+int
+o_to_sock_flags (int in)
+{
+  int out = 0;
+
+  if (in & O_NONBLOCK)
+    out |= SOCK_NONBLOCK;
+  /* Others are passed through unfiltered.  */
+  out |= in & ~(O_NONBLOCK);
+
+  return out;
+}