141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* This file handle diagnostic output that is directly sent to the LOG driver.
|
|
* This output can either be a kernel message (announced through a SYS_EVENT
|
|
* with a SIGKMESS in the signal set) or output from another system process
|
|
* (announced through a DIAGNOSTICS message).
|
|
*
|
|
* Changes:
|
|
* 21 July 2005: Created (Jorrit N. Herder)
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <minix/type.h>
|
|
#include <minix/safecopies.h>
|
|
|
|
#include "log.h"
|
|
#include "../../kernel/const.h"
|
|
#include "../../kernel/config.h"
|
|
#include "../../kernel/type.h"
|
|
|
|
/*==========================================================================*
|
|
* do_new_kmess *
|
|
*==========================================================================*/
|
|
PUBLIC int do_new_kmess(m)
|
|
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 */
|
|
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;
|
|
}
|
|
|
|
/* Ask TTY driver for log output */
|
|
mess.GETKM_GRANT= gid;
|
|
mess.m_type = GET_KMESS_S;
|
|
r= sendrec(TTY_PROC_NR, &mess);
|
|
cpf_revoke(gid);
|
|
|
|
if (r == OK) r= mess.m_type;
|
|
if (r != OK)
|
|
{
|
|
report("LOG","couldn't get copy of kmessages from TTY", r);
|
|
return EDONTREPLY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Try to get a fresh copy of the buffer with kernel messages. */
|
|
if ((r=sys_getkmessages(&kmess)) != OK) {
|
|
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
|
|
* help of the current and previous 'next' index. Note that the kernel
|
|
* buffer is circular. This works fine if less then KMESS_BUF_SIZE bytes
|
|
* is new data; else we miss % KMESS_BUF_SIZE here.
|
|
* 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_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)];
|
|
bytes --;
|
|
r ++;
|
|
i ++;
|
|
}
|
|
/* Now terminate the new message and save it in the log. */
|
|
print_buf[i] = 0;
|
|
log_append(print_buf, i);
|
|
}
|
|
|
|
/* Almost done, store 'next' so that we can determine what part of the
|
|
* kernel messages buffer to print next time a notification arrives.
|
|
*/
|
|
*prev_nextp = kmess.km_next;
|
|
return EDONTREPLY;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_diagnostics *
|
|
*===========================================================================*/
|
|
PUBLIC int do_diagnostics(message *m, int safe)
|
|
{
|
|
/* The LOG server handles all diagnostic messages from servers and device
|
|
* drivers. It forwards the message to the TTY driver to display it to the
|
|
* user. It also saves a copy in a local buffer so that messages can be
|
|
* reviewed at a later time.
|
|
*/
|
|
vir_bytes src;
|
|
int count;
|
|
char c;
|
|
int i = 0, offset = 0;
|
|
static char diagbuf[10240];
|
|
|
|
/* Also make a copy for the private buffer at the LOG server, so
|
|
* that the messages can be reviewed at a later time.
|
|
*/
|
|
src = (vir_bytes) m->DIAG_PRINT_BUF_G;
|
|
count = m->DIAG_BUF_COUNT;
|
|
while (count > 0 && i < sizeof(diagbuf)-1) {
|
|
int r;
|
|
if(safe) {
|
|
r = sys_safecopyfrom(m->m_source, src, offset, (vir_bytes) &c, 1, D);
|
|
} else {
|
|
r = sys_datacopy(m->m_source, src+offset, SELF, (vir_bytes) &c, 1);
|
|
}
|
|
if(r != OK) break;
|
|
offset ++;
|
|
count --;
|
|
diagbuf[i++] = c;
|
|
}
|
|
log_append(diagbuf, i);
|
|
|
|
return OK;
|
|
}
|