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Need separate 'prev_next' pointers for kernel and TTY.

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This commit is contained in:
Philip Homburg 2008-02-25 11:53:37 +00:00
parent 830b79f0d5
commit 65df875abb
1 changed files with 12 additions and 4 deletions
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16
drivers/log/diag.c
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@ -26,20 +26,26 @@ message *m; /* notification message */
/* Notification for a new kernel message. */
struct kmessages kmess; /* entire kmess structure */
char print_buf[KMESS_BUF_SIZE]; /* copy new message here */
static int prev_next = 0;
int bytes;
int i, r;
int *prev_nextp;
static int kernel_prev_next = 0;
static int tty_prev_next = 0;
if (m->m_source == TTY_PROC_NR)
{
cp_grant_id_t gid;
message mess;
prev_nextp= &tty_prev_next;
gid= cpf_grant_direct(TTY_PROC_NR, (vir_bytes)&kmess, sizeof(kmess),
CPF_WRITE);
if (gid == -1)
{
#if 0
report("LOG","cpf_grant_direct failed for TTY", errno);
#endif
return EDONTREPLY;
}
@ -63,6 +69,7 @@ message *m; /* notification message */
report("LOG","couldn't get copy of kmessages", r);
return EDONTREPLY;
}
prev_nextp= &kernel_prev_next;
}
/* Print only the new part. Determine how many new bytes there are with
@ -72,8 +79,9 @@ message *m; /* notification message */
* Check for size being positive, the buffer might as well be emptied!
*/
if (kmess.km_size > 0) {
bytes = ((kmess.km_next + KMESS_BUF_SIZE) - prev_next) % KMESS_BUF_SIZE;
r=prev_next; /* start at previous old */
bytes = ((kmess.km_next + KMESS_BUF_SIZE) - (*prev_nextp)) %
KMESS_BUF_SIZE;
r= *prev_nextp; /* start at previous old */
i=0;
while (bytes > 0) {
print_buf[i] = kmess.km_buf[(r%KMESS_BUF_SIZE)];
@ -89,7 +97,7 @@ message *m; /* notification message */
/* Almost done, store 'next' so that we can determine what part of the
* kernel messages buffer to print next time a notification arrives.
*/
prev_next = kmess.km_next;
*prev_nextp = kmess.km_next;
return EDONTREPLY;
}