llvm/compiler-rt/lib/sanitizer_common/sanitizer_signal_interceptors.inc

//===-- sanitizer_signal_interceptors.inc -----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Signal interceptors for sanitizers.
//
//===----------------------------------------------------------------------===//

#include "interception/interception.h"
#include "sanitizer_common.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_platform_interceptors.h"

usingnamespace__sanitizer;

#if SANITIZER_NETBSD
#define sigaction_symname …
#else
#define sigaction_symname …
#endif

#ifndef SIGNAL_INTERCEPTOR_SIGNAL_IMPL
#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signum, handler) …
#endif

#ifndef SIGNAL_INTERCEPTOR_SIGACTION_IMPL
#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact) …
#endif

#if SANITIZER_INTERCEPT_BSD_SIGNAL
INTERCEPTOR(uptr, bsd_signal, int signum, uptr handler) {
  SIGNAL_INTERCEPTOR_ENTER();
  if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
  SIGNAL_INTERCEPTOR_SIGNAL_IMPL(bsd_signal, signum, handler);
}
#define INIT_BSD_SIGNAL …
#else  // SANITIZER_INTERCEPT_BSD_SIGNAL
#define INIT_BSD_SIGNAL
#endif  // SANITIZER_INTERCEPT_BSD_SIGNAL

#if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
INTERCEPTOR(uptr, signal, int signum, uptr handler) { … }
#define INIT_SIGNAL …

INTERCEPTOR(int, sigaction_symname, int signum,
            const __sanitizer_sigaction *act, __sanitizer_sigaction *oldact) { … }
#define INIT_SIGACTION …

namespace __sanitizer {
int real_sigaction(int signum, const void *act, void *oldact) { … }
}  // namespace __sanitizer
#else  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
#define INIT_SIGNAL
#define INIT_SIGACTION
// We need to have defined REAL(sigaction) on other systems.
namespace __sanitizer {
struct __sanitizer_sigaction;
}
DEFINE_REAL(int, sigaction, int signum, const __sanitizer_sigaction *act,
            __sanitizer_sigaction *oldact)
#endif  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION

static void InitializeSignalInterceptors() { … }