delete webtry from main skia repo; it's been moved to buildbots

experimental/webtry/seccomp_bpf.h

-/*
- * seccomp example for x86 (32-bit and 64-bit) with BPF macros
- *
- * Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
- * Authors:
- *  Will Drewry <wad@chromium.org>
- *  Kees Cook <keescook@chromium.org>
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- *
- * A stripped down version of the file found in this tutorial: http://outflux.net/teach-seccomp/.
- */
-#ifndef _SECCOMP_BPF_H_
-#define _SECCOMP_BPF_H_
-
-#ifndef SK_UNSAFE_BUILD_DESKTOP_ONLY
-
-#define _GNU_SOURCE 1
-#include <stdio.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <signal.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <sys/prctl.h>
-#ifndef PR_SET_NO_NEW_PRIVS
-# define PR_SET_NO_NEW_PRIVS 38
-#endif
-
-#include <linux/unistd.h>
-#include <linux/audit.h>
-#include <linux/filter.h>
-#ifdef HAVE_LINUX_SECCOMP_H
-# include <linux/seccomp.h>
-#endif
-#ifndef SECCOMP_MODE_FILTER
-# define SECCOMP_MODE_FILTER             2 /* uses user-supplied filter. */
-# define SECCOMP_RET_KILL      0x00000000U /* kill the task immediately */
-# define SECCOMP_RET_TRAP      0x00030000U /* disallow and force a SIGSYS */
-# define SECCOMP_RET_ALLOW     0x7fff0000U /* allow */
-struct seccomp_data {
-    int nr;
-    __u32 arch;
-    __u64 instruction_pointer;
-    __u64 args[6];
-};
-#endif
-#ifndef SYS_SECCOMP
-# define SYS_SECCOMP 1
-#endif
-
-#define syscall_nr (offsetof(struct seccomp_data, nr))
-
-#define EXAMINE_SYSCALL \
-    BPF_STMT(BPF_LD+BPF_W+BPF_ABS, syscall_nr)
-
-#define ALLOW_SYSCALL(name) \
-    BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
-    BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
-
-#define KILL_PROCESS \
-    BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
-
-#endif /* SK_UNSAFE_BUILD_DESKTOP_ONLY */
-
-#endif /* _SECCOMP_BPF_H_ */