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printk: add interfaces for external access to the log buffer

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Add two new functions for reading the kernel log buffer.  The intention is for
them to be used by recovery/dump/debug code so the kernel log can be easily
retrieved/parsed in a crash scenario, but they are generic enough for other
people to dream up other fun uses.

[[email protected]: buncha fixes]
Signed-off-by: Mike Frysinger <[email protected]>
Cc: Robin Getz <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Russell King <[email protected]>
Cc: Paul Mundt <[email protected]>
Acked-by: Tim Bird <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Frysinger 2007-10-16 23:26:43 -07:00 • committed by Linus Torvalds
commit 0b15d04af3
2 changed files with 58 additions and 0 deletions
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52
kernel/printk.c
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@ -219,6 +219,58 @@ static inline void boot_delay_msec(void)
}
#endif
/*
* Return the number of unread characters in the log buffer.
*/
int log_buf_get_len(void)
{
return logged_chars;
}
/*
* Copy a range of characters from the log buffer.
*/
int log_buf_copy(char *dest, int idx, int len)
{
int ret, max;
bool took_lock = false;
if (!oops_in_progress) {
spin_lock_irq(&logbuf_lock);
took_lock = true;
}
max = log_buf_get_len();
if (idx < 0 || idx >= max) {
ret = -1;
} else {
if (len > max)
len = max;
ret = len;
idx += (log_end - max);
while (len-- > 0)
dest[len] = LOG_BUF(idx + len);
}
if (took_lock)
spin_unlock_irq(&logbuf_lock);
return ret;
}
/*
* Extract a single character from the log buffer.
*/
int log_buf_read(int idx)
{
char ret;
if (log_buf_copy(&ret, idx, 1) == 1)
return ret;
else
return -1;
}
/*
* Commands to do_syslog:
*