32 lines · cpp
1//===-- Linux implementation of signal ------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/signal/signal.h"10#include "hdr/signal_macros.h"11#include "src/__support/common.h"12#include "src/__support/macros/config.h"13#include "src/signal/sigaction.h"14 15namespace LIBC_NAMESPACE_DECL {16 17// Our LLVM_LIBC_FUNCTION macro doesn't handle function pointer return types.18using signal_handler = void (*)(int);19 20LLVM_LIBC_FUNCTION(signal_handler, signal,21 (int signum, signal_handler handler)) {22 struct sigaction action, old;23 action.sa_handler = handler;24 action.sa_flags = SA_RESTART;25 // Errno will already be set so no need to worry about changing errno here.26 return LIBC_NAMESPACE::sigaction(signum, &action, &old) == -127 ? SIG_ERR28 : old.sa_handler;29}30 31} // namespace LIBC_NAMESPACE_DECL32