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