#include <sys/wait.h>

#include <err.h>
#include <signal.h>
#include <spawn.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int
main(int argc, char **argv)
{
	struct timespec t0, t1, dt;
	pid_t child, pid;
	int error, status;

	setprogname(argv[0]);
	if (argc < 2)
		errx(1, "Usage: %s <cmd>...", getprogname());
	argc--;
	argv++;

	if (clock_gettime(CLOCK_MONOTONIC, &t0) == -1)
		err(1, "clock_gettime");

	error = posix_spawnp(&child, *argv, /*file_actions*/NULL, /*attr*/NULL,
	    argv, /*envp*/NULL);
	if (error)
		errc(1, error, "posix_spawnp");

	if ((pid = wait(&status)) != child) {
		if (pid == -1)
			err(1, "wait");
		else
			errx(1, "wrong child: %jd", (intmax_t)pid);
	}

	if (clock_gettime(CLOCK_MONOTONIC, &t1) == -1)
		err(1, "clock_gettime");

	timespecsub(&t1, &t0, &dt);
	printf("%jd.%09ld\n", (intmax_t)dt.tv_sec, dt.tv_nsec);

	if (WIFSIGNALED(status))
		raise(WTERMSIG(status));
	if (!WIFEXITED(status))
		errx(1, "bogus status: 0x%x", status);
	return WEXITSTATUS(status);
}