1 // Copyright 2010 Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above copyright 11 // notice, this list of conditions and the following disclaimer in the 12 // documentation and/or other materials provided with the distribution. 13 // * Neither the name of Google Inc. nor the names of its contributors 14 // may be used to endorse or promote products derived from this software 15 // without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #include "utils/signals/misc.hpp" 30 31 #if defined(HAVE_CONFIG_H) 32 # include "config.h" 33 #endif 34 35 extern "C" { 36 #include <signal.h> 37 } 38 39 #include <cerrno> 40 #include <cstddef> 41 42 #include "utils/format/macros.hpp" 43 #include "utils/signals/exceptions.hpp" 44 45 namespace signals = utils::signals; 46 47 48 /// Number of the last valid signal. 49 const int utils::signals::last_signo = LAST_SIGNO; 50 51 52 /// Resets a signal handler to its default behavior. 53 /// 54 /// \param signo The number of the signal handler to reset. 55 /// 56 /// \throw signals::system_error If there is a problem trying to reset the 57 /// signal handler to its default behavior. 58 void 59 signals::reset(const int signo) 60 { 61 struct ::sigaction sa; 62 sa.sa_handler = SIG_DFL; 63 sigemptyset(&sa.sa_mask); 64 sa.sa_flags = 0; 65 66 if (::sigaction(signo, &sa, NULL) == -1) { 67 const int original_errno = errno; 68 throw system_error(F("Failed to reset signal %s") % signo, 69 original_errno); 70 } 71 } 72