hi randy,
the klogctl(10, NULL, 0) is only available since 2.6.6
a lot of embedded systems are still using 2.4.x.
therefore i suggest (untested of cause):
#if kernel >266
int get_size()
{
int len;
len = klogctl(10, NULL, 0); /* read ringbuffer size */
if (len <= 0)
len = 16384;
return len;
}
#else
int get_size()
{
return 16384;
}
#endif
re,
wh
Randy Robertson schrieb:
> I wasted a bunch of time wondering why even when I increased
> CONFIG_LOG_BUF_SHIFT I was missing
> the first half second of my boot logs from dmesg. I saw a bunch of linux
> code referencing early_printk,
> and thought there was some magic crossover time when things actually started
> going to the log buffer.
>
> I didn't even think to read the dmesg man page because it never even occurred
> to me that dmesg would be
> dumb enough to hard code the size of the kernel buffer.
>
> If you would kindly apply this patch, you would be doing humanity a great
> service by ensuring that nobody ever
> wastes time because of this again.
>
> ---
> util-linux/dmesg.c | 8 +++++++-
> 1 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
> index f52026c..236a3dc 100644
> --- a/util-linux/dmesg.c
> +++ b/util-linux/dmesg.c
> @@ -31,7 +31,13 @@ int dmesg_main(int argc UNUSED_PARAM, char **argv)
> return EXIT_SUCCESS;
> }
>
> - len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384;
> + if (flags & OPT_s) {
> + len = xatoul_range(size, 2, INT_MAX);
> + } else {
> + len = klogctl(10, NULL, 0); /* read ringbuffer size */
> + if (len <= 0)
> + len = 16384;
> + }
> buf = xmalloc(len);
> len = klogctl(3 + (flags & OPT_c), buf, len);
> if (len < 0)
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