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 "hdr/types/sighandler_t.h" 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include "src/signal/sigaction.h" 15 16 namespace LIBC_NAMESPACE_DECL { 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(signum, &action, &old) == -1 24 ? SIG_ERR 25 : old.sa_handler; 26 } 27 28 } // namespace LIBC_NAMESPACE_DECL 29