Add pidfd regression test

test/src/apps/process/pidfd.c

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include "../test.h"
+
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/poll.h>
+#include <fcntl.h>
+#include <signal.h>
+
+static int child_pid;
+static int pid_fd;
+
+FN_SETUP(create_child)
+{
+	child_pid = CHECK(fork());
+
+	if (child_pid == 0) {
+		while (1) {
+			usleep(100);
+		}
+		exit(EXIT_SUCCESS);
+	}
+}
+END_SETUP()
+
+FN_TEST(pidfd_open)
+{
+	pid_fd = TEST_SUCC(syscall(SYS_pidfd_open, child_pid, 0));
+}
+END_TEST()
+
+FN_TEST(read_write)
+{
+	char buf[1] = {};
+	TEST_ERRNO(read(pid_fd, buf, 1), EINVAL);
+	TEST_ERRNO(pread(pid_fd, buf, 1, 0), ESPIPE);
+	TEST_ERRNO(write(pid_fd, "a", 1), EINVAL);
+	TEST_ERRNO(pwrite(pid_fd, "b", 1, 0), ESPIPE);
+}
+END_TEST()
+
+FN_TEST(set_nonblocking)
+{
+	int flags =
+		TEST_RES(fcntl(pid_fd, F_GETFL, 0), (_ret & O_NONBLOCK) == 0);
+	TEST_SUCC(fcntl(pid_fd, F_SETFL, flags | O_NONBLOCK));
+	TEST_RES(fcntl(pid_fd, F_GETFL, 0), (_ret & O_NONBLOCK) != 0);
+}
+END_TEST()
+
+FN_TEST(file_stat)
+{
+	struct stat file_info;
+	TEST_RES(fstat(pid_fd, &file_info),
+		 file_info.st_mode == 0600 && file_info.st_size == 0 &&
+			 file_info.st_blksize == 4096);
+}
+END_TEST()
+
+#define POLL_EVENTS (POLLIN | POLLOUT | POLLHUP | POLLERR)
+static struct pollfd pfd;
+
+FN_TEST(poll)
+{
+	pfd.fd = pid_fd;
+	pfd.events = POLL_EVENTS;
+	TEST_RES(poll(&pfd, 1, 0), pfd.revents == 0);
+
+	TEST_SUCC(kill(child_pid, SIGKILL));
+	sleep(1);
+	TEST_RES(poll(&pfd, 1, 0), pfd.revents == POLLIN);
+}
+END_TEST()
+
+FN_TEST(wait)
+{
+#define P_PIDFD 3
+	TEST_SUCC(waitid(P_PIDFD, pid_fd, NULL, WNOHANG | WEXITED));
+	pfd.revents = 0;
+	TEST_RES(poll(&pfd, 1, 0), pfd.revents == POLLIN);
+	TEST_ERRNO(waitid(P_PIDFD, pid_fd, NULL, WNOHANG | WEXITED), ECHILD);
+}
+END_TEST()
+
+FN_SETUP(cleanup)
+{
+	CHECK(close(pid_fd));
+}
+END_SETUP()

test/src/apps/scripts/process.sh

@@ -35,6 +35,7 @@ mmap/mmap_readahead
 mmap/mmap_vmrss
 process/group_session
 process/job_control
+process/pidfd
 process/wait4
 pthread/pthread_test
 pty/open_pty