#include "common.h"int getMdVersion(mdu_version_t * ver) {    int file;    int ret;    file = open("/dev/md0",O_RDONLY);    if (file < 0) {	if (errno != ENOENT)		goto err;	file = open("/dev/md/0",O_RDONLY);	if (file < 0)		goto err;    }    ret = ioctl(file, RAID_VERSION, (unsigned long)ver);    if (ret == -1) {	if (errno == EINVAL) {	    /* just fake it */	    ver->major = 0;	    ver->minor = 36;	    ver->patchlevel = 0;	} else {err:	    fprintf(stderr, "cannot determine md version: ");	    if (errno == EACCES)	        fprintf(stderr, "need to be run as root.\n");	    else if (errno == ENOSYS)	        fprintf(stderr, "kernel has no RAID support.\n");	    else if (errno == EEXIST)	        fprintf(stderr, "device already running!\n");	    else if (errno == ENOENT)	        fprintf(stderr, "no MD device file in /dev.\n");	    else	        fprintf(stderr, "%d.\n", errno);	    close(file);	    return -1;	}    }    close(file);    return 0;}