external/bsd/atf/dist/atf-c/signals.c

   1 /*
   2  * Automated Testing Framework (atf)
   3  *
   4  * Copyright (c) 2007, 2008 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 #include <sys/types.h>
  35
  36 #include <errno.h>
  37 #include <stdbool.h>
  38 #include <unistd.h>
  39
  40 #include "atf-c/error.h"
  41 #include "atf-c/sanity.h"
  42 #include "atf-c/signals.h"
  43
  44 const int atf_signals_last_signo = LAST_SIGNO;
  45
  46 /* ---------------------------------------------------------------------
  47  * The "atf_signal_holder" type.
  48  * --------------------------------------------------------------------- */
  49
  50 static bool happened[LAST_SIGNO + 1];
  51
  52 static
  53 void
  54 holder_handler(int signo)
  55 {
  56     happened[signo] = true;
  57 }
  58
  59 /*
  60  * Constructors/destructors.
  61  */
  62
  63 atf_error_t
  64 atf_signal_holder_init(atf_signal_holder_t *sh, int signo)
  65 {
  66     atf_error_t err;
  67
  68     err = atf_signal_programmer_init(&sh->m_sp, signo, holder_handler);
  69     if (atf_is_error(err))
  70         goto out;
  71
  72     atf_object_init(&sh->m_object);
  73     sh->m_signo = signo;
  74     happened[signo] = false;
  75
  76     INV(!atf_is_error(err));
  77 out:
  78     return err;
  79 }
  80
  81 void
  82 atf_signal_holder_fini(atf_signal_holder_t *sh)
  83 {
  84     atf_signal_programmer_fini(&sh->m_sp);
  85
  86     if (happened[sh->m_signo])
  87         kill(getpid(), sh->m_signo);
  88
  89     atf_object_fini(&sh->m_object);
  90 }
  91
  92 /*
  93  * Getters.
  94  */
  95
  96 void
  97 atf_signal_holder_process(atf_signal_holder_t *sh)
  98 {
  99     if (happened[sh->m_signo]) {
 100         int ret;
 101         atf_error_t err;
 102
 103         atf_signal_programmer_fini(&sh->m_sp);
 104         happened[sh->m_signo] = false;
 105
 106         ret = kill(getpid(), sh->m_signo);
 107         INV(ret != -1);
 108
 109         err = atf_signal_programmer_init(&sh->m_sp, sh->m_signo,
 110                                          holder_handler);
 111         INV(!atf_is_error(err));
 112     }
 113 }
 114
 115 /* ---------------------------------------------------------------------
 116  * The "atf_signal_programmer" type.
 117  * --------------------------------------------------------------------- */
 118
 119 /*
 120  * Constructors/destructors.
 121  */
 122
 123 atf_error_t
 124 atf_signal_programmer_init(atf_signal_programmer_t *sp, int signo,
 125                            atf_signal_handler_t handler)
 126 {
 127     atf_error_t err;
 128     struct sigaction sa;
 129
 130     sa.sa_handler = handler;
 131     sigemptyset(&sa.sa_mask);
 132     sa.sa_flags = 0;
 133
 134     if (sigaction(signo, &sa, &sp->m_oldsa) == -1)
 135         err = atf_libc_error(errno, "Failed to program signal %d", signo);
 136     else {
 137         atf_object_init(&sp->m_object);
 138         sp->m_signo = signo;
 139         err = atf_no_error();
 140     }
 141
 142     return err;
 143 }
 144
 145 void
 146 atf_signal_programmer_fini(atf_signal_programmer_t *sp)
 147 {
 148     if (sigaction(sp->m_signo, &sp->m_oldsa, NULL) == -1)
 149         UNREACHABLE;
 150
 151     atf_object_fini(&sp->m_object);
 152 }
 153
 154 /* ---------------------------------------------------------------------
 155  * Free functions.
 156  * --------------------------------------------------------------------- */
 157
 158 void
 159 atf_signal_reset(int signo)
 160 {
 161     struct sigaction sa;
 162
 163     sa.sa_handler = SIG_DFL;
 164     sigemptyset(&sa.sa_mask);
 165     sa.sa_flags = 0;
 166
 167     (void)sigaction(signo, &sa, NULL);
 168 }