View of xos/kernel/printk.c

/* Copyright (C) 2008  Emmanuel Varoquaux
 
   This file is part of XOS.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
#include <console.h>
#include <gdt.h>
#include <asm.h>
#include <config.h>
#include <sprintf.h>
 
/* printk() utilise en interne un tampon static, plutot qu'un tampon sur la
 * pile, afin d'eviter un debordement de celle-ci. Par consequent, pour
 * empecher tout acces concurrent, les interruptions doivent etre desactivees
 * dans printk(). */
void __attribute__ ((format (printf, 1, 2))) printk(const char *format, ...)
{
  static char buf[PRINTK_BUFFER_SIZE];
  int intr;
  va_list arg;
  int n;
  unsigned short fs;
 
  disable_intr(intr);
 
  va_start(arg, format);
  if ((n = vsnprintf(buf, PRINTK_BUFFER_SIZE, format, arg)) < 0)
    goto error;
  va_end(arg);
 
  get_fs(fs);
  load_fs(KERNEL_DATA_SEL);
  console_write(buf, n);
  load_fs(fs);
 
  restore_intr(intr);
  return;
 
 error:
  va_end(arg);
  restore_intr(intr);
}