Add syscall clone3

regression/apps/clone3/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: MPL-2.0
+
+include ../test_common.mk
+
+EXTRA_C_FLAGS := 

regression/apps/clone3/clone_process.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#define _GNU_SOURCE
+#include <err.h>
+#include <errno.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#ifndef CLONE_PIDFD
+#define CLONE_PIDFD 0x00001000
+#endif
+
+static pid_t sys_clone3(struct clone_args *args)
+{
+	return syscall(SYS_clone3, args, sizeof(struct clone_args));
+}
+
+#define ptr_to_u64(ptr) ((__u64)((uintptr_t)(ptr)))
+
+int main(int argc, char *argv[])
+{
+	int pidfd = -1;
+	pid_t parent_tid = -1, pid = -1;
+	struct clone_args args = { 0 };
+
+	args.parent_tid = ptr_to_u64(&parent_tid); /* CLONE_PARENT_SETTID */
+	args.flags = CLONE_PARENT_SETTID;
+	args.exit_signal = SIGCHLD;
+
+	pid = sys_clone3(&args);
+	if (pid < 0) {
+		printf("%s - Failed to create new process\n", strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	if (pid == 0) {
+		printf("Child process with pid %d\n", getpid());
+		exit(EXIT_SUCCESS);
+	}
+
+	printf("Parent process: child's pid %d\n", pid);
+	printf("Parent process: child's pid %d in parent_tid\n",
+	       *(pid_t *)args.parent_tid);
+
+	waitpid(pid, NULL, 0);
+
+	if (pid != *(pid_t *)args.parent_tid)
+		exit(EXIT_FAILURE);
+
+	close(pidfd);
+
+	return 0;
+}