1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/sched.h>
6 #include <linux/types.h>
13 #include <sys/resource.h>
15 #include <sys/types.h>
20 #include "../kselftest_harness.h"
22 #define ptr_to_u64(ptr) ((__u64)((uintptr_t)(ptr)))
24 /* Attempt to de-conflict with the selftests tree. */
26 #define SKIP(s, ...) XFAIL(s, ##__VA_ARGS__)
29 static pid_t sys_clone3(struct clone_args *args)
31 return syscall(__NR_clone3, args, sizeof(struct clone_args));
34 static int sys_waitid(int which, pid_t pid, siginfo_t *info, int options,
37 return syscall(__NR_waitid, which, pid, info, options, ru);
42 int pidfd = -1, status = 0;
43 pid_t parent_tid = -1;
44 struct clone_args args = {
45 .parent_tid = ptr_to_u64(&parent_tid),
46 .pidfd = ptr_to_u64(&pidfd),
47 .flags = CLONE_PIDFD | CLONE_PARENT_SETTID,
48 .exit_signal = SIGCHLD,
56 pidfd = open("/proc/self", O_DIRECTORY | O_RDONLY | O_CLOEXEC);
59 pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
61 EXPECT_EQ(close(pidfd), 0);
64 pidfd = open("/dev/null", O_RDONLY | O_CLOEXEC);
67 pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
69 EXPECT_EQ(close(pidfd), 0);
72 pid = sys_clone3(&args);
78 pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
80 ASSERT_EQ(WIFEXITED(info.si_status), true);
81 ASSERT_EQ(WEXITSTATUS(info.si_status), 0);
82 EXPECT_EQ(close(pidfd), 0);
84 ASSERT_EQ(info.si_signo, SIGCHLD);
85 ASSERT_EQ(info.si_code, CLD_EXITED);
86 ASSERT_EQ(info.si_pid, parent_tid);
91 int pidfd = -1, status = 0;
92 pid_t parent_tid = -1;
93 struct clone_args args = {
94 .parent_tid = ptr_to_u64(&parent_tid),
95 .pidfd = ptr_to_u64(&pidfd),
96 .flags = CLONE_PIDFD | CLONE_PARENT_SETTID,
97 .exit_signal = SIGCHLD,
105 pid = sys_clone3(&args);
109 kill(getpid(), SIGSTOP);
110 kill(getpid(), SIGSTOP);
114 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WSTOPPED, NULL), 0);
115 ASSERT_EQ(info.si_signo, SIGCHLD);
116 ASSERT_EQ(info.si_code, CLD_STOPPED);
117 ASSERT_EQ(info.si_pid, parent_tid);
119 ASSERT_EQ(sys_pidfd_send_signal(pidfd, SIGCONT, NULL, 0), 0);
121 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WCONTINUED, NULL), 0);
122 ASSERT_EQ(info.si_signo, SIGCHLD);
123 ASSERT_EQ(info.si_code, CLD_CONTINUED);
124 ASSERT_EQ(info.si_pid, parent_tid);
126 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WUNTRACED, NULL), 0);
127 ASSERT_EQ(info.si_signo, SIGCHLD);
128 ASSERT_EQ(info.si_code, CLD_STOPPED);
129 ASSERT_EQ(info.si_pid, parent_tid);
131 ASSERT_EQ(sys_pidfd_send_signal(pidfd, SIGKILL, NULL, 0), 0);
133 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL), 0);
134 ASSERT_EQ(info.si_signo, SIGCHLD);
135 ASSERT_EQ(info.si_code, CLD_KILLED);
136 ASSERT_EQ(info.si_pid, parent_tid);
138 EXPECT_EQ(close(pidfd), 0);
143 int pidfd, status = 0;
144 unsigned int flags = 0;
145 pid_t parent_tid = -1;
146 struct clone_args args = {
147 .parent_tid = ptr_to_u64(&parent_tid),
148 .flags = CLONE_PARENT_SETTID,
149 .exit_signal = SIGCHLD,
158 * Callers need to see ECHILD with non-blocking pidfds when no child
161 pidfd = sys_pidfd_open(getpid(), PIDFD_NONBLOCK);
162 EXPECT_GE(pidfd, 0) {
163 /* pidfd_open() doesn't support PIDFD_NONBLOCK. */
164 ASSERT_EQ(errno, EINVAL);
165 SKIP(return, "Skipping PIDFD_NONBLOCK test");
168 ret = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
170 ASSERT_EQ(errno, ECHILD);
171 EXPECT_EQ(close(pidfd), 0);
173 pid = sys_clone3(&args);
177 kill(getpid(), SIGSTOP);
181 pidfd = sys_pidfd_open(pid, PIDFD_NONBLOCK);
182 EXPECT_GE(pidfd, 0) {
183 /* pidfd_open() doesn't support PIDFD_NONBLOCK. */
184 ASSERT_EQ(errno, EINVAL);
185 SKIP(return, "Skipping PIDFD_NONBLOCK test");
188 flags = fcntl(pidfd, F_GETFL, 0);
190 ASSERT_GT((flags & O_NONBLOCK), 0);
193 * Callers need to see EAGAIN/EWOULDBLOCK with non-blocking pidfd when
194 * child processes exist but none have exited.
196 ret = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
198 ASSERT_EQ(errno, EAGAIN);
201 * Callers need to continue seeing 0 with non-blocking pidfd and
202 * WNOHANG raised explicitly when child processes exist but none have
205 ret = sys_waitid(P_PIDFD, pidfd, &info, WEXITED | WNOHANG, NULL);
208 ASSERT_EQ(fcntl(pidfd, F_SETFL, (flags & ~O_NONBLOCK)), 0);
210 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WSTOPPED, NULL), 0);
211 ASSERT_EQ(info.si_signo, SIGCHLD);
212 ASSERT_EQ(info.si_code, CLD_STOPPED);
213 ASSERT_EQ(info.si_pid, parent_tid);
215 ASSERT_EQ(sys_pidfd_send_signal(pidfd, SIGCONT, NULL, 0), 0);
217 ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL), 0);
218 ASSERT_EQ(info.si_signo, SIGCHLD);
219 ASSERT_EQ(info.si_code, CLD_EXITED);
220 ASSERT_EQ(info.si_pid, parent_tid);
222 EXPECT_EQ(close(pidfd), 0);