| 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-exception |
|---|
| 6 | // |
|---|
| 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 | |
|---|
| 15 | namespace LIBC_NAMESPACE_DECL { |
|---|
| 16 | |
|---|
| 17 | // Our LLVM_LIBC_FUNCTION macro doesn't handle function pointer return types. |
|---|
| 18 | using signal_handler = void (*)(int); |
|---|
| 19 | |
|---|
| 20 | LLVM_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) == -1 |
|---|
| 27 | ? SIG_ERR |
|---|
| 28 | : old.sa_handler; |
|---|
| 29 | } |
|---|
| 30 | |
|---|
| 31 | } // namespace LIBC_NAMESPACE_DECL |
|---|
| 32 | |
|---|
