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 (argc == 1)
		usage();

	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 (typec) {
	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	if (argc == 1)
24	usage();
25
26	if (argv[0][0] == '-' && argv[0][1] == 'm' && !argv[0][2]) {
27	mode_set = strtoul(argv[1], &endp, 8);
28	argv += 2;
29	}
30
31	name = *argv++;
32	if (!name)
33	usage();
34
35	type = *argv++;
36	if (!type \|\| !type[0] \|\| type[1])
37	usage();
38	typec = type[0];
39
40	mode = 0;
41	switch (typec) {
42	case 'c':
43	mode = S_IFCHR;
44	break;
45	case 'b':
46	mode = S_IFBLK;
47	break;
48	case 'p':
49	mode = S_IFIFO;
50	break;
51	default:
52	usage();
53	}
54
55	if (mode == S_IFIFO) {
56	dev = 0;
57	} else {
58	if (!argv[0] \|\| !argv[1])
59	usage();
60
61	major_num = strtol(*argv++, &endp, 0);
62	if (*endp != '\0')
63	usage();
64	minor_num = strtol(*argv++, &endp, 0);
65	if (*endp != '\0')
66	usage();
67	dev = makedev(major_num, minor_num);
68	}
69
70	if (*argv)
71	usage();
72
73	if (mknod(name, mode\|0666, dev) == -1) {
74	perror("mknod");
75	exit(1);
76	}
77
78	if (mode_set && chmod(name, mode_set)) {
79	perror("chmod");
80	exit(1);
81	}
82
83	exit(0);
84	}