usr/utils/mknod.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

char *progname;

static __noreturn usage(void)
{
	fprintf(stderr, "Usage: %s [-m mode] name {b|c|p} major minor\n",
			progname);
	exit(1);
}

int main(int argc, char *argv[])
{
	char *name, *type, typec, *endp;
	unsigned int major_num, minor_num;
	mode_t mode, mode_set = 0;
	dev_t dev;

	progname = *argv++;

	if (argv[0][0] == '-' && argv[0][1] == 'm' && !argv[0][2]) {
		mode_set = strtoul(argv[1], &endp, 8);
		argv += 2;
	}

	name = *argv++;
	if (!name)
		usage();

	type = *argv++;
	if (!type || !type[0] || type[1])
		usage();
	typec = type[0];

	mode = 0;
	switch (type[0]) {
	case 'c':
		mode = S_IFCHR;
		break;
	case 'b':
		mode = S_IFBLK;
		break;
	case 'p':
		mode = S_IFIFO;
		break;
	default:
		usage();
	}

	if (mode == S_IFIFO) {
		dev = 0;
	} else {
		if (!argv[0] || !argv[1])
			usage();

		major_num = strtol(*argv++, &endp, 0);
		if (*endp != '\0')
			usage();
		minor_num = strtol(*argv++, &endp, 0);
		if (*endp != '\0')
			usage();
		dev = makedev(major_num, minor_num);
	}

	if (*argv)
		usage();

	if (mknod(name, mode|0666, dev) == -1) {
		perror("mknod");
		exit(1);
	}

	if (mode_set && chmod(name, mode_set)) {
		perror("chmod");
		exit(1);
	}

	exit(0);
}
1	#include <stdio.h>
2	#include <stdlib.h>
3	#include <string.h>
4	#include <sys/stat.h>
5
6	char *progname;
7
8	static __noreturn usage(void)
9	{
10	fprintf(stderr, "Usage: %s [-m mode] name {b\|c\|p} major minor\n",
11	progname);
12	exit(1);
13	}
14
15	int main(int argc, char *argv[])
16	{
17	char name, type, typec, *endp;
18	unsigned int major_num, minor_num;
19	mode_t mode, mode_set = 0;
20	dev_t dev;
21
22	progname = *argv++;
23
24	if (argv[0][0] == '-' && argv[0][1] == 'm' && !argv[0][2]) {
25	mode_set = strtoul(argv[1], &endp, 8);
26	argv += 2;
27	}
28
29	name = *argv++;
30	if (!name)
31	usage();
32
33	type = *argv++;
34	if (!type \|\| !type[0] \|\| type[1])
35	usage();
36	typec = type[0];
37
38	mode = 0;
39	switch (type[0]) {
40	case 'c':
41	mode = S_IFCHR;
42	break;
43	case 'b':
44	mode = S_IFBLK;
45	break;
46	case 'p':
47	mode = S_IFIFO;
48	break;
49	default:
50	usage();
51	}
52
53	if (mode == S_IFIFO) {
54	dev = 0;
55	} else {
56	if (!argv[0] \|\| !argv[1])
57	usage();
58
59	major_num = strtol(*argv++, &endp, 0);
60	if (*endp != '\0')
61	usage();
62	minor_num = strtol(*argv++, &endp, 0);
63	if (*endp != '\0')
64	usage();
65	dev = makedev(major_num, minor_num);
66	}
67
68	if (*argv)
69	usage();
70
71	if (mknod(name, mode\|0666, dev) == -1) {
72	perror("mknod");
73	exit(1);
74	}
75
76	if (mode_set && chmod(name, mode_set)) {
77	perror("chmod");
78	exit(1);
79	}
80
81	exit(0);
82	}