kppp/utils.cpp

   1 //---------------------------------------------------------------------------
   2 //
   3 //             kPPP: A pppd front end for the KDE project
   4 //
   5 //---------------------------------------------------------------------------
   6 //
   7 // (c) 1997-1998 Bernd Johannes Wuebben <wuebben@kde.org>
   8 // (c) 1997-1999 Mario Weilguni <mweilguni@kde.org>
   9 // (c) 1998-1999 Harri Porten <porten@kde.org>
  10 //
  11 // derived from Jay Painters "ezppp"
  12 //
  13 //---------------------------------------------------------------------------
  14 //
  15 //  $Id$
  16 //
  17 //---------------------------------------------------------------------------
  18 //
  19 //  This program is free software; you can redistribute it and-or
  20 //  modify it under the terms of the GNU Library General Public
  21 //  License as published by the Free Software Foundation; either
  22 //  version 2 of the License, or (at your option) any later version.
  23 //
  24 //  This program is distributed in the hope that it will be useful,
  25 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27 //  Library General Public License for more details.
  28 //
  29 //  You should have received a copy of the GNU Library General Public
  30 //  License along with this program; if not, write to the Free
  31 //  Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  32 //
  33 //---------------------------------------------------------------------------
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <limits.h>
  41
  42 #include "utils.h"
  43 #include "kpppconfig.h"
  44
  45 // in case of error, we simply return "0" and hope it's ok :-)
  46 int pppInterfaceNumber() {
  47   char ifname[PATH_MAX];
  48
  49   for(int i = 0; i < 8; i++) {
  50     snprintf(ifname, sizeof(ifname), "%s/ppp%d.pid", PPP_PID_DIR, i);
  51     if(access(ifname, F_OK) == -1)
  52       return i;
  53   }
  54
  55   // panic
  56   fprintf(stderr, "pppInterfaceNumber: cannot detect ppp interface number!\n");
  57   return 0;
  58 }
  59