Vladimir Oleynik pointed out that va_start() twice in the same function isn't portable (with ppc 4xx as an example of a platform it doesn't work on). This is why va_copy exists.

/* vi: set sw=4 ts=4: */
/*
 * sleep.c - Wait for a number of seconds.
 */

#include "toys.h"

int sleep_main(void)
{
	return sleep(atol(*toys.optargs));
}