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116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018 Eric van Gyzen
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <atf-c.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdlib.h>
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/*
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* TODO add tests for:
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*
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* - all error cases
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* - SS_DISABLE
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* - no effect without SA_ONSTACK
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*/
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static sig_atomic_t disabled_correct = 1;
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static sig_atomic_t level1_correct = -1;
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static sig_atomic_t level2_correct = -1;
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static void
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sig_handler(int signo, siginfo_t *info __unused, void *ucp)
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{
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ucontext_t *uc = ucp;
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// The alternate signal stack is enabled.
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disabled_correct = disabled_correct &&
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(uc->uc_stack.ss_flags & SS_DISABLE) == 0;
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if (signo == SIGUSR1) {
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// The thread was NOT running on the alternate signal
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// stack when this signal arrived.
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level1_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) == 0;
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raise(SIGUSR2);
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} else {
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// The thread WAS running on the alternate signal
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// stack when this signal arrived.
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level2_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) != 0;
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}
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}
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ATF_TC(ss_onstack);
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ATF_TC_HEAD(ss_onstack, tc)
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{
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atf_tc_set_md_var(tc, "descr", "Test reporting of SS_ONSTACK");
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}
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ATF_TC_BODY(ss_onstack, tc)
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{
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stack_t ss = {
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.ss_size = SIGSTKSZ,
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};
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stack_t oss = {
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.ss_size = 0,
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};
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ss.ss_sp = malloc(ss.ss_size);
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ATF_REQUIRE(ss.ss_sp != NULL);
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ATF_REQUIRE(sigaltstack(&ss, &oss) == 0);
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// There should be no signal stack currently configured.
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ATF_CHECK(oss.ss_sp == NULL);
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ATF_CHECK(oss.ss_size == 0);
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ATF_CHECK((oss.ss_flags & SS_DISABLE) != 0);
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ATF_CHECK((oss.ss_flags & SS_ONSTACK) == 0);
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struct sigaction sa = {
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.sa_sigaction = sig_handler,
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.sa_flags = SA_ONSTACK | SA_SIGINFO,
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};
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ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0);
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ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0);
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ATF_REQUIRE(sigaction(SIGUSR2, &sa, NULL) == 0);
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ATF_REQUIRE(raise(SIGUSR1) == 0);
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ATF_CHECK(level1_correct != -1);
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ATF_CHECK(level1_correct == 1);
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ATF_CHECK(level2_correct != -1);
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ATF_CHECK(level2_correct == 1);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, ss_onstack);
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return (atf_no_error());
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}
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