#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2021 Mark Johnston <markj@FreeBSD.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# ptrace(2) test scenario by Mark Johnston
# https://people.freebsd.org/~markj/ptrace_stop_mt.c
# Fixed by r303423.
# stopped on signal 17 after detach
# UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND
# 1001 47125 62778 0 52 0 6568 2456 wait S+ 2 0:00.01 /bin/sh ./ptrace10.sh
# 1001 47146 47125 0 23 0 6108 1928 nanslp S+ 2 0:00.00 ./ptrace10
# 1001 47148 47146 0 24 0 6240 1932 - T+ 2 0:00.00 ./ptrace10
# 1001 47148 47146 0 24 0 6240 1932 - T+ 2 0:00.00 ./ptrace10
. ../default.cfg
cd /tmp
cat > ptrace10.c <<EOF
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <err.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void
sighup(int sig __unused)
{
}
static void
sleep_forever(void)
{
while (1)
sleep(1);
}
static void *
thread(void *arg __unused)
{
sleep_forever();
return (NULL);
}
int
main(void)
{
struct sigaction act;
sigset_t set;
pthread_t t;
pid_t pid, ret;
int e, try, limit, r, status;
e = 0;
pid = fork();
if (pid < 0)
err(1, "fork");
if (pid == 0) {
act.sa_handler = sighup;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
if (sigaction(SIGHUP, &act, NULL) != 0)
err(1, "sigaction");
r = pthread_create(&t, NULL, thread, NULL);
if (r != 0)
errc(1, r, "pthread_create");
/* Force SIGHUP to be delivered to the new thread. */
sigemptyset(&set);
sigaddset(&set, SIGHUP);
r = pthread_sigmask(SIG_BLOCK, &set, NULL);
if (r != 0)
errc(1, r, "pthread_sigmask");
sleep_forever();
} else {
sleep(1); /* give the child a chance to set itself up */
limit = 100;
for (try = 1; try <= limit; try++) {
if (kill(pid, SIGHUP) != 0)
err(1, "kill(SIGHUP)");
if (ptrace(PT_ATTACH, pid, NULL, 0) != 0)
err(1, "ptrace(PT_ATTACH)");
if (waitpid(pid, &status, WUNTRACED) != pid)
err(1, "waitpid 1");
if (!WIFSTOPPED(status))
errx(1, "unexpected status %d after PT_ATTACH",
status);
if (ptrace(PT_DETACH, pid, NULL, 0) != 0)
err(1, "ptrace(PT_DETACH)");
sleep(1);
ret = waitpid(pid, &status, WUNTRACED | WNOHANG);
if (ret < 0)
err(1, "waitpid");
if (ret == 0)
continue;
if (!WIFSTOPPED(status))
errx(1, "unexpected status %d after PT_DETACH",
status);
printf("stopped on signal %d after detach\n",
WSTOPSIG(status));
e = 1;
break;
}
}
kill(pid, SIGINT);
return (e);
}
EOF
mycc -o ptrace10 -Wall -Wextra -O2 -g ptrace10.c -lpthread || exit 1
rm ptrace10.c
./ptrace10
s=$?
if [ $s -ne 0 ]; then
ps -lxH | grep -v grep | egrep "UID|ptrace10"
while pgrep -q ptrace10; do
pkill -9 ptrace10
done
fi
wait
rm -f ptrace10
exit $s
