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 extern "C" {
31 #include <signal.h>
32 #include <unistd.h>
33 }
34
35 #include <cerrno>
36 #include <cstdlib>
37
38 #include "exceptions.hpp"
39 #include "signals.hpp"
40
41 namespace impl = tools::signals;
42 #define IMPL_NAME "tools::signals"
43
44 #define LAST_SIGNO 63
45 const int impl::last_signo = LAST_SIGNO;
46
47 // ------------------------------------------------------------------------
48 // The "signal_holder" class.
49 // ------------------------------------------------------------------------
50
51 namespace {
52
53 static bool happened[LAST_SIGNO + 1];
54
55 static
56 void
holder_handler(const int signo)57 holder_handler(const int signo)
58 {
59 happened[signo] = true;
60 }
61
62 } // anonymous namespace
63
signal_holder(const int signo)64 impl::signal_holder::signal_holder(const int signo) :
65 m_signo(signo),
66 m_sp(NULL)
67 {
68 happened[signo] = false;
69 m_sp = new signal_programmer(m_signo, holder_handler);
70 }
71
~signal_holder(void)72 impl::signal_holder::~signal_holder(void)
73 {
74 if (m_sp != NULL)
75 delete m_sp;
76
77 if (happened[m_signo])
78 ::kill(::getpid(), m_signo);
79 }
80
81 void
process(void)82 impl::signal_holder::process(void)
83 {
84 if (happened[m_signo]) {
85 delete m_sp;
86 m_sp = NULL;
87 happened[m_signo] = false;
88 ::kill(::getpid(), m_signo);
89 m_sp = new signal_programmer(m_signo, holder_handler);
90 }
91 }
92
93 // ------------------------------------------------------------------------
94 // The "signal_programmer" class.
95 // ------------------------------------------------------------------------
96
signal_programmer(const int signo,const handler h)97 impl::signal_programmer::signal_programmer(const int signo, const handler h) :
98 m_signo(signo),
99 m_handler(h),
100 m_programmed(false)
101 {
102 struct ::sigaction sa;
103
104 sa.sa_handler = m_handler;
105 sigemptyset(&sa.sa_mask);
106 sa.sa_flags = 0;
107
108 if (::sigaction(m_signo, &sa, &m_oldsa) == -1)
109 throw tools::system_error(IMPL_NAME, "Could not install handler for "
110 "signal", errno);
111 m_programmed = true;
112 }
113
~signal_programmer(void)114 impl::signal_programmer::~signal_programmer(void)
115 {
116 unprogram();
117 }
118
119 void
unprogram(void)120 impl::signal_programmer::unprogram(void)
121 {
122 if (m_programmed) {
123 if (::sigaction(m_signo, &m_oldsa, NULL) == -1)
124 std::abort();
125 m_programmed = false;
126 }
127 }
128
129 // ------------------------------------------------------------------------
130 // Free functions.
131 // ------------------------------------------------------------------------
132
133 void
reset(const int signo)134 impl::reset(const int signo)
135 {
136 struct ::sigaction sa;
137
138 sa.sa_handler = SIG_DFL;
139 sigemptyset(&sa.sa_mask);
140 sa.sa_flags = 0;
141
142 (void)::sigaction(signo, &sa, NULL);
143 }
144