34 static pid_t pidfd_clone(int flags, int *pidfd)  in pidfd_clone()  argument
40 	return __clone2(do_child, stack, stack_size, flags | SIGCHLD, NULL, pidfd);  in pidfd_clone()
42 	return clone(do_child, stack + stack_size, flags | SIGCHLD, NULL, pidfd);  in pidfd_clone()
46 static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,  in sys_pidfd_send_signal()  argument
49 	return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);  in sys_pidfd_send_signal()
52 static int pidfd_metadata_fd(pid_t pid, int pidfd)  in pidfd_metadata_fd()  argument
68 	ret = sys_pidfd_send_signal(pidfd, 0, NULL, 0);  in pidfd_metadata_fd()
86 	int pidfd = -1, ret = EXIT_FAILURE;  in main()  local
92 	pid = pidfd_clone(CLONE_PIDFD, &pidfd);  in main()
95 	if (pidfd == -1) {  in main()
100 	procfd = pidfd_metadata_fd(pid, pidfd);  in main()
101 	close(pidfd);  in main()