#include <u.h>#include <libc.h> char *e;ulong mode = 0777L; voidusage(void){	fprint(2, "usage: mkdir [-p] [-m mode] dir...\n");	exits("usage");} intmakedir(char *s){	int f; 	if(access(s, AEXIST) == 0){		fprint(2, "mkdir: %s already exists\n", s);		e = "error";		return -1;	}	f = create(s, OREAD, DMDIR | mode);	if(f < 0){		fprint(2, "mkdir: can't create %s: %r\n", s);		e = "error";		return -1;	}	close(f);	return 0;} voidmkdirp(char *s){	char *p; 	for(p=strchr(s+1, '/'); p; p=strchr(p+1, '/')){		*p = 0;		if(access(s, AEXIST) != 0 && makedir(s) < 0)			return;		*p = '/';	}	if(access(s, AEXIST) != 0)		makedir(s);}  voidmain(int argc, char *argv[]){	int i, pflag;	char *m; 	pflag = 0;	ARGBEGIN{	default:		usage();	case 'm':		m = ARGF();		if(m == nil)			usage();		mode = strtoul(m, &m, 8);		if(mode > 0777)			usage();		break;	case 'p':		pflag = 1;		break;	}ARGEND 	for(i=0; i<argc; i++){		if(pflag)			mkdirp(argv[i]);		else			makedir(argv[i]);	}	exits(e);}