Android: create a generic android_ucontext.h

sandbox/linux/services/android_x86_ucontext.h

Index: sandbox/linux/services/android_x86_ucontext.h
diff --git a/sandbox/linux/services/android_x86_ucontext.h b/sandbox/linux/services/android_x86_ucontext.h
new file mode 100644
index 0000000000000000000000000000000000000000..a28cd87166373bc33f036309a8f1c52da63b6819
--- /dev/null
+++ b/sandbox/linux/services/android_x86_ucontext.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_
+#define SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_
+
+// This is basically include/uapi/asm-generic/ucontext.h from the Linux kernel.
+// In theory, Android libc's could expand the structure for its own internal
+// use, but if the libc provides an API that expects this expanded structure,
+// __BIONIC_HAVE_UCONTEXT_T should be defined.
+
+#if !defined(__BIONIC_HAVE_UCONTEXT_T)
+#include <asm/sigcontext.h>
+
+// We also need greg_t for the sandbox, include it in this header as well.
+typedef unsigned long greg_t;
+
+typedef struct ucontext {
+  unsigned long   uc_flags;
+  struct ucontext  *uc_link;
+  stack_t     uc_stack;
+  struct sigcontext uc_mcontext;
+  sigset_t    uc_sigmask; /* mask last for extensibility */
+} ucontext_t;
+
+#else
+#include <sys/ucontext.h>
+#endif  // __BIONIC_HAVE_UCONTEXT_T
+
+#endif  // SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_