/* 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 "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 */  static int prev_next = 0;  int bytes;  int i, r;  if (m->m_source == TTY_PROC_NR)  {	message mess;	/* Ask TTY driver for log output */	mess.GETKM_PTR= &kmess;	mess.m_type = GET_KMESS;	r= sendrec(TTY_PROC_NR, &mess);	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;	}  }  /* 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)];          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_next = kmess.km_next;  return EDONTREPLY;}/*===========================================================================* *				do_diagnostics				     * *===========================================================================*/PUBLIC int do_diagnostics(message *m){/* 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. */  int proc_nr;   vir_bytes src;  int count;  char c;  int i = 0;  static char diagbuf[10240];  /* Change SELF to actual process number. */  if ((proc_nr = m->DIAG_PROC_NR) == SELF)      m->DIAG_PROC_NR = proc_nr = m->m_source;  /* Now 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;  count = m->DIAG_BUF_COUNT;   while (count > 0 && i < sizeof(diagbuf)-1) {      if (sys_datacopy(proc_nr, src, SELF, (vir_bytes) &c, 1) != OK)           break;		/* stop copying on error */      src ++;      count --;      diagbuf[i++] = c;  }  log_append(diagbuf, i);  return OK;}