/* $Id: wifi.c,v 1.6 2004/01/29 04:40:03 reinelt Exp $ * * WIFI specific functions * * Copyright 2003 Xavier Vello <xavier66@free.fr> * * based on lcd4linux/isdn.c which is * Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at> * * This file is part of LCD4Linux. * * LCD4Linux 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, or (at your option) * any later version. * * LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA. * * * $Log: wifi.c,v $ * Revision 1.6 2004/01/29 04:40:03 reinelt * every .c file includes "config.h" now * * Revision 1.5 2004/01/09 04:16:06 reinelt * added 'section' argument to cfg_get(), but NULLed it on all calls by now. * * Revision 1.4 2004/01/06 22:33:14 reinelt * Copyright statements cleaned up * * Revision 1.3 2003/12/01 07:08:51 reinelt * * Patches from Xavier: * - WiFi: make interface configurable * - "quiet" as an option from the config file * - ignore missing "MemShared" on Linux 2.6 * * Revision 1.2 2003/11/28 18:34:55 nicowallmeier * Minor bugfixes * * Revision 1.1 2003/11/14 05:59:37 reinelt * added wifi.c wifi.h which have been forgotten at the last checkin * */ /* * exported functions: * * Wifi (int *signal, int *link, int *noise) * returns 0 if ok, -1 if error * sets *signal to signal level (which determines the rate) * sets *link to link quality * sets *noise to noise level (reverse of link quality) * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/types.h> #include "debug.h" #include "wifi.h" #include "filter.h" #include "cfg.h" int Wifi (int *signal, int *link, int *noise) { int ws, wl, wn; static int fd=-2; char buffer[4096]; char *p; char *interface=cfg_get(NULL, "Wifi.Interface", "wlan0"); *signal=0; *link=0; *noise=0; if (fd==-1) return -1; if (fd==-2) { fd = open("/proc/net/wireless", O_RDONLY); // the real procfs file //fd = open("/wireless", O_RDONLY); // a fake file for testing if (fd==-1) { error ("open(/proc/net/wireless) failed: %s", strerror(errno)); return -1; } debug ("open(/proc/net/wireless)=%d", fd); } if (lseek(fd, 0L, SEEK_SET)!=0) { error ("lseek(/proc/net/wireless) failed: %s", strerror(errno)); fd=-1; return -1; } if (read (fd, &buffer, sizeof(buffer)-1)==-1) { error("read(/proc/net/wireless) failed: %s", strerror(errno)); fd=-1; return -1; } p=strstr(buffer, interface); if (p!=NULL) { // TODO : size of interface ?? if (sscanf(p+13, "%d", &wl)!=1) { error ("parse(/proc/net/wireless) failed: unknown format"); fd=-1; return -1; } if (sscanf(p+19, "%d", &ws)!=1) { error ("parse(/proc/net/wireless) failed: unknown format"); fd=-1; return -1; } if (sscanf(p+25, "%d", &wn)!=1) { error ("parse(/proc/net/wireless) failed: unknown format"); fd=-1; return -1; } } else { error("read(/proc/net/wireless) failed: %s", strerror(errno)); fd=-1; return -1; } *signal=ws; *link=wl; *noise=wn; return 0; }