setkey.c revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
1#include <stdio.h>
2#include <stdlib.h>
3#include <fcntl.h>
4#include <string.h>
5#include <linux/kd.h>
6#include <linux/vt.h>
7#include <errno.h>
8
9static void setkey_usage(char *argv[])
10{
11    fprintf(stderr, "%s [-t <table>] [-k <index>] [-v value] [-r] [-h]\n"
12            "  -t <table> Select table\n"
13            "  -k <index> Select key\n"
14            "  -v <value> Set entry\n"
15            "  -r         Read current entry\n"
16            "  -h         Print help\n", argv[0]);
17}
18
19#define TTYDEV	"/dev/tty0"
20
21int setkey_main(int argc, char *argv[])
22{
23    int fd;
24    struct kbentry kbe;
25    int did_something = 0;
26
27    kbe.kb_table = 0;
28    kbe.kb_index = -1;
29    kbe.kb_value = 0;
30
31    fd = open(TTYDEV, O_RDWR | O_SYNC);
32    if (fd < 0) {
33        fprintf(stderr, "open %s: %s\n", TTYDEV, strerror(errno));
34        return 1;
35    }
36
37    do {
38        int c, ret;
39
40        c = getopt(argc, argv, "t:k:v:hr");
41        if (c == EOF)
42            break;
43
44        switch (c) {
45        case 't':
46            kbe.kb_table = strtol(optarg, NULL, 0);
47            break;
48        case 'k':
49            kbe.kb_index = strtol(optarg, NULL, 0);
50            break;
51        case 'v':
52            kbe.kb_value = strtol(optarg, NULL, 0);
53            ret = ioctl(fd, KDSKBENT, &kbe);
54            if (ret < 0) {
55                fprintf(stderr, "KDSKBENT %d %d %d failed: %s\n",
56                        kbe.kb_table, kbe.kb_index, kbe.kb_value,
57                        strerror(errno));
58                return 1;
59            }
60            did_something = 1;
61            break;
62        case 'r':
63            ret = ioctl(fd, KDGKBENT, &kbe);
64            if (ret < 0) {
65                fprintf(stderr, "KDGKBENT %d %d  failed: %s\n",
66                        kbe.kb_table, kbe.kb_index, strerror(errno));
67                return 1;
68            }
69            printf("0x%x 0x%x 0x%x\n",
70                   kbe.kb_table, kbe.kb_index, kbe.kb_value);
71            did_something = 1;
72            break;
73        case 'h':
74            setkey_usage(argv);
75            return 1;
76        case '?':
77            fprintf(stderr, "%s: invalid option -%c\n",
78                argv[0], optopt);
79            return 1;
80        }
81    } while (1);
82
83    if(optind != argc || !did_something) {
84        setkey_usage(argv);
85        return 1;
86    }
87
88    return 0;
89}
90