| 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 "src/signal/sigaction.h" |
| 11 | |
| 12 | #include "src/__support/common.h" |
| 13 | |
| 14 | #include <signal.h> |
| 15 | |
| 16 | namespace LIBC_NAMESPACE { |
| 17 | |
| 18 | LLVM_LIBC_FUNCTION(sighandler_t, signal, (int signum, sighandler_t handler)) { |
| 19 | struct sigaction action, old; |
| 20 | action.sa_handler = handler; |
| 21 | action.sa_flags = SA_RESTART; |
| 22 | // Errno will already be set so no need to worry about changing errno here. |
| 23 | return LIBC_NAMESPACE::sigaction(signal: signum, libc_new: &action, libc_old: &old) == -1 |
| 24 | ? SIG_ERR |
| 25 | : old.sa_handler; |
| 26 | } |
| 27 | |
| 28 | } // namespace LIBC_NAMESPACE |
| 29 |