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loadkmap: explain what happens with K_ALLOCATED key value

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2013-09-19 17:56:59 +02:00
parent a6ed6a3148
commit 054f3eb784
1 changed files with 19 additions and 8 deletions
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27
console-tools/loadkmap.c
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@@ -48,6 +48,7 @@ int loadkmap_main(int argc UNUSED_PARAM, char **argv)
if (argv[1])
bb_show_usage();
/* bb_warn_ignoring_args(argv[1]); */
fd = get_console_fd_or_die();
/* or maybe:
opt = getopt32(argv, "C:", &tty_name);
@@ -61,14 +62,24 @@ int loadkmap_main(int argc UNUSED_PARAM, char **argv)
xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);
for (i = 0; i < MAX_NR_KEYMAPS; i++) {
if (flags[i] == 1) {
xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
for (j = 0; j < NR_KEYS; j++) {
ke.kb_index = j;
ke.kb_table = i;
ke.kb_value = ibuff[j];
ioctl(fd, KDSKBENT, &ke);
}
if (flags[i] != 1)
continue;
xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
for (j = 0; j < NR_KEYS; j++) {
ke.kb_index = j;
ke.kb_table = i;
ke.kb_value = ibuff[j];
/*
* Note: table[idx:0] can contain special value
* K_ALLOCATED (marks allocated tables in kernel).
* dumpkmap saves the value as-is; but attempts
* to load it here fail, since it isn't a valid
* key value: it is K(KT_SPEC,126) == 2<<8 + 126,
* whereas last valid KT_SPEC is
* K_BARENUMLOCK == K(KT_SPEC,19).
* So far we just ignore these errors:
*/
ioctl(fd, KDSKBENT, &ke);
}
}