This is xnu-10002.1.13. See this file in:
#include "perf_index.h"
#include "fail.h"
#include "test_file_helper.h"
#include "ramdisk.h"
#include <sys/param.h>
#include <stdio.h>

const char ramdisk_name[] = "StressRAMDisk";
char ramdisk_path[MAXPATHLEN];

DECL_SETUP {
	int retval;

	retval = setup_ram_volume(ramdisk_name, ramdisk_path);
	VERIFY(retval == PERFINDEX_SUCCESS, "setup_ram_volume failed");

	printf("ramdisk: %s\n", ramdisk_path);

	return test_file_write_setup(ramdisk_path, num_threads, length);
}

DECL_TEST {
	return test_file_write(ramdisk_path, thread_id, num_threads, length, 0L);
}

DECL_CLEANUP {
	int retval;

	retval = test_file_write_cleanup(ramdisk_path, num_threads, length);
	VERIFY(retval == PERFINDEX_SUCCESS, "test_file_read_cleanup failed");

	retval = cleanup_ram_volume(ramdisk_path);
	VERIFY(retval == 0, "cleanup_ram_volume failed");

	return PERFINDEX_SUCCESS;
}