external/bsd/bind/dist/unit/atf-src/atf-run/signals.cpp

   1 //
   2 // Automated Testing Framework (atf)
   3 //
   4 // Copyright (c) 2007 The NetBSD Foundation, Inc.
   5 // All rights reserved.
   6 //
   7 // Redistribution and use in source and binary forms, with or without
   8 // modification, are permitted provided that the following conditions
   9 // are met:
  10 // 1. Redistributions of source code must retain the above copyright
  11 //    notice, this list of conditions and the following disclaimer.
  12 // 2. Redistributions in binary form must reproduce the above copyright
  13 //    notice, this list of conditions and the following disclaimer in the
  14 //    documentation and/or other materials provided with the distribution.
  15 //
  16 // THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17 // CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20 // IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23 // GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25 // IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27 // IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29
  30 #if defined(HAVE_CONFIG_H)
  31 #include "bconfig.h"
  32 #endif
  33
  34 extern "C" {
  35 #include <signal.h>
  36 #include <unistd.h>
  37 }
  38
  39 #include <cerrno>
  40
  41 #include "atf-c++/detail/exceptions.hpp"
  42 #include "atf-c++/detail/sanity.hpp"
  43
  44 #include "signals.hpp"
  45
  46 namespace impl = atf::atf_run;
  47 #define IMPL_NAME "atf::atf_run"
  48
  49 const int impl::last_signo = LAST_SIGNO;
  50
  51 // ------------------------------------------------------------------------
  52 // The "signal_holder" class.
  53 // ------------------------------------------------------------------------
  54
  55 namespace {
  56
  57 static bool happened[LAST_SIGNO + 1];
  58
  59 static
  60 void
  61 holder_handler(const int signo)
  62 {
  63     happened[signo] = true;
  64 }
  65
  66 } // anonymous namespace
  67
  68 impl::signal_holder::signal_holder(const int signo) :
  69     m_signo(signo),
  70     m_sp(NULL)
  71 {
  72     happened[signo] = false;
  73     m_sp = new signal_programmer(m_signo, holder_handler);
  74 }
  75
  76 impl::signal_holder::~signal_holder(void)
  77 {
  78     if (m_sp != NULL)
  79         delete m_sp;
  80
  81     if (happened[m_signo])
  82         ::kill(::getpid(), m_signo);
  83 }
  84
  85 void
  86 impl::signal_holder::process(void)
  87 {
  88     if (happened[m_signo]) {
  89         delete m_sp;
  90         m_sp = NULL;
  91         happened[m_signo] = false;
  92         ::kill(::getpid(), m_signo);
  93         m_sp = new signal_programmer(m_signo, holder_handler);
  94     }
  95 }
  96
  97 // ------------------------------------------------------------------------
  98 // The "signal_programmer" class.
  99 // ------------------------------------------------------------------------
 100
 101 impl::signal_programmer::signal_programmer(const int signo, const handler h) :
 102     m_signo(signo),
 103     m_handler(h),
 104     m_programmed(false)
 105 {
 106     struct ::sigaction sa;
 107
 108     sa.sa_handler = m_handler;
 109     sigemptyset(&sa.sa_mask);
 110     sa.sa_flags = 0;
 111
 112     if (::sigaction(m_signo, &sa, &m_oldsa) == -1)
 113         throw atf::system_error(IMPL_NAME, "Could not install handler for "
 114                                 "signal", errno);
 115     m_programmed = true;
 116 }
 117
 118 impl::signal_programmer::~signal_programmer(void)
 119 {
 120     unprogram();
 121 }
 122
 123 void
 124 impl::signal_programmer::unprogram(void)
 125 {
 126     if (m_programmed) {
 127         if (::sigaction(m_signo, &m_oldsa, NULL) == -1)
 128             UNREACHABLE;
 129         m_programmed = false;
 130     }
 131 }
 132
 133 // ------------------------------------------------------------------------
 134 // Free functions.
 135 // ------------------------------------------------------------------------
 136
 137 void
 138 impl::reset(const int signo)
 139 {
 140     struct ::sigaction sa;
 141
 142     sa.sa_handler = SIG_DFL;
 143     sigemptyset(&sa.sa_mask);
 144     sa.sa_flags = 0;
 145
 146     (void)::sigaction(signo, &sa, NULL);
 147 }