1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause 5# 6# Copyright (c) 2016 Mark Johnston <markj@FreeBSD.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# ptrace(2) test scenario by Mark Johnston 31# https://people.freebsd.org/~markj/ptrace_stop.c 32# Fixed by r303423. 33 34. ../default.cfg 35 36cd /tmp 37cat > ptrace9.c <<EOF 38#include <sys/types.h> 39#include <sys/ptrace.h> 40#include <sys/wait.h> 41 42#include <err.h> 43#include <signal.h> 44#include <stdio.h> 45#include <unistd.h> 46 47static void 48sigalrm(int sig __unused) 49{ 50 _exit(0); 51} 52 53static void 54sighup(int sig __unused) 55{ 56} 57 58int 59main(void) 60{ 61 struct sigaction act; 62 pid_t pid; 63 int e, status; 64 65 signal(SIGALRM, sigalrm); 66 e = 1; 67 pid = fork(); 68 if (pid < 0) 69 err(1, "fork"); 70 if (pid == 0) { 71 act.sa_handler = sighup; 72 act.sa_flags = 0; 73 sigemptyset(&act.sa_mask); 74 if (sigaction(SIGHUP, &act, NULL) != 0) 75 err(1, "sigaction"); 76 alarm(5); 77 while (1) { 78 sleep(1); 79 } 80 } else { 81 alarm(5); 82 sleep(1); /* give the child a chance to call sigaction */ 83 84 if (kill(pid, SIGSTOP) != 0) 85 err(1, "kill(SIGSTOP)"); 86 87 printf("waiting for child to stop...\n"); 88 if (waitpid(pid, &status, WUNTRACED) != pid) 89 err(1, "waitpid"); 90 if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) 91 errx(1, "unexpected status %d after SIGSTOP", status); 92 93 if (kill(pid, SIGHUP) != 0) 94 err(1, "kill(SIGHUP)"); 95 96 if (ptrace(PT_ATTACH, pid, NULL, 0) != 0) 97 err(1, "ptrace(PT_ATTACH)"); 98 if (waitpid(pid, &status, WUNTRACED) != pid) 99 err(1, "waitpid"); 100 if (!WIFSTOPPED(status)) 101 errx(1, "unexpected status %d after PT_ATTACH", status); 102 printf("stopping signal is %d\n", WSTOPSIG(status)); 103 if (ptrace(PT_DETACH, pid, NULL, 0) != 0) 104 err(1, "ptrace(PT_DETACH)"); 105 106 /* if ptrace works as expected, we'll block here */ 107 printf("waiting on child...\n"); fflush(stdout); 108 if (waitpid(pid, &status, WUNTRACED) != pid) 109 err(1, "waitpid"); 110 if (!WIFSTOPPED(status)) 111 errx(1, "unexpected status %d after PT_DETACH", status); 112 printf("child is stopped after detach (sig %d)\n", 113 WSTOPSIG(status)); fflush(stdout); 114 e = 1; 115 } 116 117 return (e); 118} 119EOF 120 121mycc -o ptrace9 -Wall -Wextra -O2 -g ptrace9.c || exit 1 122rm ptrace9.c 123 124echo "Expect: 125 waiting for child to stop... 126 stopping signal is 17 127 waiting on child..." 128./ptrace9 129s=$? 130 131pkill -9 ptrace9 132rm -f ptrace9 133exit $s 134