linux-dvb-apps.git - linux-dvb-apps Debian packaging

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/* $Id: plugin_loadavg.c,v 1.10 2005/05/08 04:32:44 reinelt Exp $ * * plugin for load average * * Copyright (C) 2003 Michael Reinelt <reinelt@eunet.at> * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * 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: plugin_loadavg.c,v $ * Revision 1.10 2005/05/08 04:32:44 reinelt * CodingStyle added and applied * * Revision 1.9 2005/01/18 06:30:23 reinelt * added (C) to all copyright statements * * Revision 1.8 2004/06/26 12:05:00 reinelt * * uh-oh... the last CVS log message messed up things a lot... * * Revision 1.7 2004/06/26 09:27:21 reinelt * * added '-W' to CFLAGS * changed all C++ comments to C ones * cleaned up a lot of signed/unsigned mistakes * * Revision 1.6 2004/03/11 06:39:59 reinelt * big patch from Martin: * - reuse filehandles * - memory leaks fixed * - earlier busy-flag checking with HD44780 * - reuse memory for strings in RESULT and hash * - netdev_fast to wavid time-consuming regex * * Revision 1.5 2004/03/08 18:46:21 hejl * Fixed bug introduced with "caching" the loadavg values * * Revision 1.4 2004/03/03 03:47:04 reinelt * big patch from Martin Hejl: * - use qprintf() where appropriate * - save CPU cycles on gettimeofday() * - add quit() functions to free allocated memory * - fixed lots of memory leaks * * Revision 1.3 2004/01/30 07:12:35 reinelt * HD44780 busy-flag support from Martin Hejl * loadavg() uClibc replacement from Martin Heyl * round() uClibc replacement from Martin Hejl * warning in i2c_sensors fixed * [ * * Revision 1.2 2004/01/29 04:40:02 reinelt * every .c file includes "config.h" now * * Revision 1.1 2004/01/15 04:29:45 reinelt * moved lcd4linux.conf.sample to *.old * lcd4linux.conf.sample with new layout * new plugins 'loadavg' and 'meminfo' * text widget have pre- and postfix * */ /* * exported functions: * * int plugin_init_loadavg (void) * adds functions for load average * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/time.h> #include <fcntl.h> #include "debug.h" #include "plugin.h" #ifndef HAVE_GETLOADAVG static int fd = -2; int getloadavg(double loadavg[], int nelem) { char buf[65], *p; ssize_t nread; int i; if (fd == -2) fd = open("/proc/loadavg", O_RDONLY); if (fd < 0) return -1; lseek(fd, 0, SEEK_SET); nread = read(fd, buf, sizeof buf - 1); if (nread < 0) return -1; buf[nread - 1] = '\0'; if (nelem > 3) nelem = 3; p = buf; for (i = 0; i < nelem; ++i) { char *endp; loadavg[i] = strtod(p, &endp); if (endp == NULL || endp == p) /* This should not happen. The format of /proc/loadavg must have changed. Don't return with what we have, signal an error. */ return -1; p = endp; } return i; } #endif static void my_loadavg(RESULT * result, RESULT * arg1) { static int nelem = -1; int index, age; static double loadavg[3]; static struct timeval last_value; struct timeval now; gettimeofday(&now, NULL); age = (now.tv_sec - last_value.tv_sec) * 1000 + (now.tv_usec - last_value.tv_usec) / 1000; /* reread every 10 msec only */ if (nelem == -1 || age == 0 || age > 10) { nelem = getloadavg(loadavg, 3); if (nelem < 0) { error("getloadavg() failed!"); SetResult(&result, R_STRING, ""); return; } last_value = now; } index = R2N(arg1); if (index < 1 || index > nelem) { error("loadavg(%d): index out of range!", index); SetResult(&result, R_STRING, ""); return; } SetResult(&result, R_NUMBER, &(loadavg[index - 1])); return; } int plugin_init_loadavg(void) { AddFunction("loadavg", 1, my_loadavg); return 0; } void plugin_exit_loadavg(void) { #ifndef HAVE_GETLOADAVG if (fd > 0) close(fd); fd = -2; #endif }


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