minix/servers/is/diag.c
Ben Gras 42050e39f8 kernel and servers send diagnostic messages to IS; IS sends them to TTY
and the new log driver if enabled.

new usyslogd is started from /usr/etc/rc. New device created by
MAKEDEV.sh. /var/log created by etc/mtree/minix.tree (on root for
now). Made select() slightly more generic, with less code duplication.
2005-07-08 17:30:01 +00:00

176 lines
5.1 KiB
C

#include <stdio.h>
#include <fcntl.h>
#include "is.h"
#include "../../kernel/const.h"
#include "../../kernel/type.h"
/*==========================================================================*
* log_message *
*==========================================================================*/
PRIVATE void log_message(char *buf)
{
#if ENABLE_LOG
message m;
m.m_type = DIAGNOSTICS;
m.DIAG_PRINT_BUF = buf;
m.DIAG_BUF_COUNT = strlen(buf);
_sendrec(LOG_PROC_NR, &m);
#endif
return;
}
/*==========================================================================*
* 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 */
static int prev_next = 0;
int size, next;
int bytes;
int i, r;
/* Try to get a fresh copy of the buffer with kernel messages. */
if ((r=sys_getkmessages(&kmess)) != OK) {
report("IS","couldn't get copy of kmessages", r);
return;
}
/* 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_next) % KMESS_BUF_SIZE;
r=prev_next; /* start at previous old */
i=0;
while (bytes > 0) {
print_buf[i] = kmess.km_buf[(r%KMESS_BUF_SIZE)];
diag_putc( kmess.km_buf[(r%KMESS_BUF_SIZE)] );
bytes --;
r ++;
i ++;
}
/* Now terminate the new message and print it. */
print_buf[i] = 0;
printf(print_buf);
/* Also send message to log device. */
log_message(print_buf);
}
/* 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 = next;
return EDONTREPLY;
}
/*===========================================================================*
* do_diagnostics *
*===========================================================================*/
PUBLIC int do_diagnostics(message *m)
{
/* The IS 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.
*/
int result;
int proc_nr;
vir_bytes src;
int count;
char c;
int i = 0;
static char diagbuf[1024];
/* Forward the message to the TTY driver. Inform the TTY driver about the
* original sender, so that it knows where the buffer to be printed is.
* The message type, DIAGNOSTICS, remains the same.
*/
if ((proc_nr = m->DIAG_PROC_NR) == SELF)
m->DIAG_PROC_NR = proc_nr = m->m_source;
result = _sendrec(TTY, m);
/* Now also make a copy for the private buffer at the IS server, so
* that the messages can be reviewed at a later time.
*/
src = (vir_bytes) m->DIAG_PRINT_BUF;
count = m->DIAG_BUF_COUNT;
while (count > 0) {
if (sys_datacopy(proc_nr, src, SELF, (vir_bytes) &c, 1) != OK)
break; /* stop copying on error */
diag_putc(c); /* accumulate character */
src ++;
count --;
diagbuf[i++] = c;
if(i == sizeof(diagbuf) - 1) {
diagbuf[i] = '\0';
log_message(diagbuf);
i = 0;
}
}
if(i > 0) {
/* This is safe; if i were too large,
* this would have been done above.
*/
diagbuf[i] = '\0';
log_message(diagbuf);
}
return result;
}
/*===========================================================================*
* diag_putc *
*===========================================================================*/
PUBLIC void diag_putc(c)
int c; /* char to be added to diag buffer */
{
diag_buf[diag_next] = c;
diag_next = (diag_next + 1) % DIAG_BUF_SIZE;
if (diag_size < DIAG_BUF_SIZE)
diag_size += 1;
}
/*===========================================================================*
* diagnostics_dmp *
*===========================================================================*/
PUBLIC void diagnostics_dmp()
{
char print_buf[DIAG_BUF_SIZE+1]; /* buffer used to print */
int start; /* calculate start of messages */
int size, r;
/* Reprint all diagnostic messages. First determine start and copy the
* buffer into a print-buffer. This is done because the messages in the
* copy may wrap (the buffer is circular).
*/
start = ((diag_next + DIAG_BUF_SIZE) - diag_size) % DIAG_BUF_SIZE;
r = 0;
size = diag_size;
while (size > 0) {
print_buf[r] = diag_buf[(start+r) % DIAG_BUF_SIZE];
r ++;
size --;
}
print_buf[r] = 0; /* make sure it terminates */
printf("Dump of diagnostics from device drivers and servers.\n\n");
printf(print_buf); /* print the messages */
}