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//===-- Linux implementation of sigaction ---------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "src/signal/sigaction.h"
#include "hdr/types/sigset_t.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/signal/linux/signal_utils.h"
namespace LIBC_NAMESPACE_DECL {
// TOOD: Some architectures will have their signal trampoline functions in the
// vdso, use those when available.
extern "C" void __restore_rt();
LLVM_LIBC_FUNCTION(int, sigaction,
(int signal, const struct sigaction *__restrict libc_new,
struct sigaction *__restrict libc_old)) {
KernelSigaction kernel_new;
if (libc_new) {
kernel_new = *libc_new;
if (!(kernel_new.sa_flags & SA_RESTORER)) {
kernel_new.sa_flags |= SA_RESTORER;
kernel_new.sa_restorer = __restore_rt;
}
}
KernelSigaction kernel_old;
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_rt_sigaction, signal, libc_new ? &kernel_new : nullptr,
libc_old ? &kernel_old : nullptr, sizeof(sigset_t));
if (ret) {
libc_errno = -ret;
return -1;
}
if (libc_old)
*libc_old = kernel_old;
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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