2 * Copyright (C) 2016 Google, Inc.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
25 #include <sys/ptrace.h>
27 #include <sys/timerfd.h>
28 #include <sys/types.h>
31 #include "../kselftest.h"
39 if (sched_setaffinity(0, sizeof(set), &set) != 0) {
40 ksft_print_msg("sched_setaffinity() failed: %s\n",
45 if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
46 ksft_print_msg("ptrace(PTRACE_TRACEME) failed: %s\n",
51 if (raise(SIGSTOP) != 0) {
52 ksft_print_msg("raise(SIGSTOP) failed: %s\n", strerror(errno));
59 bool run_test(int cpu)
66 ksft_print_msg("fork() failed: %s\n", strerror(errno));
72 wpid = waitpid(pid, &status, __WALL);
74 ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
77 if (!WIFSTOPPED(status)) {
78 ksft_print_msg("child did not stop: %s\n", strerror(errno));
81 if (WSTOPSIG(status) != SIGSTOP) {
82 ksft_print_msg("child did not stop with SIGSTOP: %s\n",
87 if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) {
90 "ptrace(PTRACE_SINGLESTEP) not supported on this architecture: %s\n",
93 ksft_print_msg("ptrace(PTRACE_SINGLESTEP) failed: %s\n",
98 wpid = waitpid(pid, &status, __WALL);
100 ksft_print_msg("waitpid() failed: $s\n", strerror(errno));
103 if (WIFEXITED(status)) {
104 ksft_print_msg("child did not single-step: %s\n",
108 if (!WIFSTOPPED(status)) {
109 ksft_print_msg("child did not stop: %s\n", strerror(errno));
112 if (WSTOPSIG(status) != SIGTRAP) {
113 ksft_print_msg("child did not stop with SIGTRAP: %s\n",
118 if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {
119 ksft_print_msg("ptrace(PTRACE_CONT) failed: %s\n",
124 wpid = waitpid(pid, &status, __WALL);
126 ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
129 if (!WIFEXITED(status)) {
130 ksft_print_msg("child did not exit after PTRACE_CONT: %s\n",
141 struct sigevent event = {};
144 struct itimerspec spec = {};
147 ksft_exit_skip("Please run the test as root - Exiting.\n");
149 power_state_fd = open("/sys/power/state", O_RDWR);
150 if (power_state_fd < 0)
152 "open(\"/sys/power/state\") failed %s)\n",
155 timerfd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
157 ksft_exit_fail_msg("timerfd_create() failed\n");
159 spec.it_value.tv_sec = 5;
160 err = timerfd_settime(timerfd, 0, &spec, NULL);
162 ksft_exit_fail_msg("timerfd_settime() failed\n");
164 if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem"))
165 ksft_exit_fail_msg("Failed to enter Suspend state\n");
168 close(power_state_fd);
171 int main(int argc, char **argv)
174 bool do_suspend = true;
175 bool succeeded = true;
176 cpu_set_t available_cpus;
182 while ((opt = getopt(argc, argv, "n")) != -1) {
188 printf("Usage: %s [-n]\n", argv[0]);
189 printf(" -n: do not trigger a suspend/resume cycle before the test\n");
197 err = sched_getaffinity(0, sizeof(available_cpus), &available_cpus);
199 ksft_exit_fail_msg("sched_getaffinity() failed\n");
201 for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
204 if (!CPU_ISSET(cpu, &available_cpus))
207 test_success = run_test(cpu);
209 ksft_test_result_pass("CPU %d\n", cpu);
211 ksft_test_result_fail("CPU %d\n", cpu);