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vmcore-dmesg: Collect full dmesg regardless of logged_chars

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logged_chars would be set to 0 by `dmesg -c`, but full dmesg is useful
for debugging. So instead of using logged_chars directly, we calculate
it by ourselves.

Now logged_chars is set to the minimum of log_end and log_buf_len, as
the same logic as crash utility is using.

Signed-off-by: Dangyi Liu <dliu@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Dangyi Liu
2015-10-28 17:15:24 +08:00
committed by Simon Horman
parent 35cb8a0761
commit 61cfab4e2c
1 changed files with 6 additions and 0 deletions
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6
vmcore-dmesg/vmcore-dmesg.c
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@@ -540,6 +540,12 @@ static void dump_dmesg_legacy(int fd)
exit(53); exit(53);
} }
/*
* To collect full dmesg including the part before `dmesg -c` is useful
* for later debugging. Use same logic as what crash utility is using.
*/
logged_chars = log_end < log_buf_len ? log_end : log_buf_len;
write_to_stdout(buf + (log_buf_len - logged_chars), logged_chars); write_to_stdout(buf + (log_buf_len - logged_chars), logged_chars);
} }