1 files changed, 141 insertions, 0 deletions
diff --git a/plugin_loadavg.c b/plugin_loadavg.c
new file mode 100644
index 0000000..4f366a8
--- /dev/null
+++ b/plugin_loadavg.c
@@ -0,0 +1,141 @@
+/* $Id: plugin_loadavg.c 840 2007-09-09 12:17:42Z michael $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_loadavg.c $
+ *
+ * plugin for load average
+ *
+ * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.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.
+ *
+ */
+
+/* 
+ * 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
+}