log.c

linux下远程启动服务/bootp服务器源代码

/*
 *
 *   bootpd_nis: simple BOOTP server with NIS maps support
 *   Copyright (C) 2005 <[e-mail]>
 *
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *
 *  $Id: log.c,v 1.3 2005/03/02 21:03:41 bfleisch Exp $
 *
 */




#include "log.h"


static FILE* logfile=NULL;

static void 
logger_file(int p, const char* fmt, va_list ap)
{
  static char* P;
  time_t now;
  char t[256];
  
  if (!logfile) logfile=stderr;
  
  switch (p)
  {
    case LOG_INFO:
      P="(INFO)";
      break;
 
    case LOG_NOTICE:
      P="(NOTICE)";
      break;
    
    case LOG_DEBUG:
      P="(DEBUG)";
      break;
    
    case LOG_ERR:
    default:
      P="(ERROR)";
      break;    
  }

  time(&now);
  
  strftime(t, 256, "%c", localtime(&now));
  
  fprintf (logfile, "[%s] %s ", t, P);
  vfprintf(logfile, fmt, ap);
  fprintf (logfile, "\n");

  fflush(logfile);  
}


static void 
logger_syslog(int p, const char* fmt, va_list ap)
{
  vsyslog( p, fmt, ap);
}


/*
 * default logger function
 */
static void (*logger)(int, const char*, va_list) = logger_file;


void
log_msg(int p, const char* fmt, ...)
{
  va_list ap;
  
  va_start(ap, fmt);
  logger(p, fmt, ap);
  va_end(ap);
  
}


void
log_perror(int p, const char* fmt, ...)
{
  va_list ap;
  char msg[1024];
 
  va_start(ap,fmt); 
  vsnprintf(msg, 1024, fmt, ap);
  va_end(ap);
  log_msg(p, "%s %s", msg, strerror(errno));
  
}



void 
log_set_logfile(const char* filename)
{
  FILE* sav;
  
  sav = logfile;
  logfile = fopen(filename, "a+");
  if (!logfile)
      logfile=sav;
  else
      logger = logger_file;
}


void 
log_set_stderr()
{
  logfile = stderr;
  logger = logger_file;
}

void 
log_set_syslog(char* ident, int opt, int facility)
{
  openlog(ident, opt, facility);
  logger = logger_syslog;
}