libc/src/signal/linux/signal.cpp

   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