1 #include <u.h>
2 #include <libc.h>
3 
4 int touch(int, char *);
5 ulong now;
6 int tflag;
7 
8 void
9 usage(void)
10 {
11 	fprint(2, "usage: touch [-c] [-t time] files\n");
12 	exits("usage");
13 }
14 
15 void
16 main(int argc, char **argv)
17 {
18 	int nocreate = 0;
19 	int status = 0;
20 
21 	now = time(0);
22 	ARGBEGIN{
23 	case 't':
24 		tflag = 1;
25 		now = strtoul(EARGF(usage()), 0, 0);
26 		break;
27 	case 'c':
28 		nocreate = 1;
29 		break;
30 	default:
31 		usage();
32 	}ARGEND
33 
34 	if(!*argv)
35 		usage();
36 	while(*argv)
37 		status += touch(nocreate, *argv++);
38 	if(status)
39 		exits("touch");
40 	exits(0);
41 }
42 
43 int
44 touch(int nocreate, char *name)
45 {
46 	Dir stbuff;
47 	int fd;
48 
49 	nulldir(&stbuff);
50 	stbuff.mtime = now;
51 	if(dirwstat(name, &stbuff) >= 0)
52 		return 0;
53 	if(nocreate){
54 		fprint(2, "touch: %s: cannot wstat: %r\n", name);
55 		return 1;
56 	}
57 	if((fd = create(name, OWRITE, 0666)) < 0) {
58 		fprint(2, "touch: %s: cannot create: %r\n", name);
59 		return 1;
60 	}
61 	if(tflag && dirfwstat(fd, &stbuff) < 0){
62 		fprint(2, "touch: %s: cannot wstat: %r\n", name);
63 		close(fd);
64 		return 1;
65 	}
66 	close(fd);
67 	return 0;
68 }