51 lines · cpp
1//===-- Linux implementation of sigaction ---------------------------------===//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/sigaction.h"10 11#include "hdr/types/sigset_t.h"12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include "src/__support/macros/config.h"15#include "src/signal/linux/signal_utils.h"16 17namespace LIBC_NAMESPACE_DECL {18 19// TOOD: Some architectures will have their signal trampoline functions in the20// vdso, use those when available.21 22extern "C" void __restore_rt();23 24LLVM_LIBC_FUNCTION(int, sigaction,25 (int signal, const struct sigaction *__restrict libc_new,26 struct sigaction *__restrict libc_old)) {27 KernelSigaction kernel_new;28 if (libc_new) {29 kernel_new = *libc_new;30 if (!(kernel_new.sa_flags & SA_RESTORER)) {31 kernel_new.sa_flags |= SA_RESTORER;32 kernel_new.sa_restorer = __restore_rt;33 }34 }35 36 KernelSigaction kernel_old;37 int ret = LIBC_NAMESPACE::syscall_impl<int>(38 SYS_rt_sigaction, signal, libc_new ? &kernel_new : nullptr,39 libc_old ? &kernel_old : nullptr, sizeof(sigset_t));40 if (ret) {41 libc_errno = -ret;42 return -1;43 }44 45 if (libc_old)46 *libc_old = kernel_old;47 return 0;48}49 50} // namespace LIBC_NAMESPACE_DECL51