1 files changed, 137 insertions, 0 deletions
diff --git a/plugin_meminfo.c b/plugin_meminfo.c
new file mode 100644
index 0000000..b7af6dc
--- /dev/null
+++ b/plugin_meminfo.c
@@ -0,0 +1,137 @@
+/* $Id: plugin_meminfo.c 840 2007-09-09 12:17:42Z michael $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_meminfo.c $
+ *
+ * plugin for /proc/meminfo parsing
+ *
+ * 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_meminfo (void)
+ *  adds functions to access /proc/meminfo
+ *
+ */
+
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "debug.h"
+#include "plugin.h"
+
+#include "hash.h"
+
+
+static HASH MemInfo;
+static FILE *stream = NULL;
+
+static int parse_meminfo(void)
+{
+    int age;
+
+    /* reread every 10 msec only */
+    age = hash_age(&MemInfo, NULL);
+    if (age > 0 && age <= 10)
+	return 0;
+
+    if (stream == NULL)
+	stream = fopen("/proc/meminfo", "r");
+    if (stream == NULL) {
+	error("fopen(/proc/meminfo) failed: %s", strerror(errno));
+	return -1;
+    }
+
+    rewind(stream);
+    while (!feof(stream)) {
+	char buffer[256];
+	char *c, *key, *val;
+	fgets(buffer, sizeof(buffer), stream);
+	c = strchr(buffer, ':');
+	if (c == NULL)
+	    continue;
+	key = buffer;
+	val = c + 1;
+	/* strip leading blanks from key */
+	while (isspace(*key))
+	    *key++ = '\0';
+	/* strip trailing blanks from key */
+	do
+	    *c = '\0';
+	while (isspace(*--c));
+	/* strip leading blanks from value */
+	while (isspace(*val))
+	    *val++ = '\0';
+	/* strip trailing blanks from value */
+	for (c = val; *c != '\0'; c++);
+	while (isspace(*--c))
+	    *c = '\0';
+	/* skip lines that do not end with " kB" */
+	if (*c == 'B' && *(c - 1) == 'k' && *(c - 2) == ' ') {
+	    /* strip trailing " kB" from value */
+	    *(c - 2) = '\0';
+	    /* add entry to hash table */
+	    hash_put(&MemInfo, key, val);
+	}
+    }
+    return 0;
+}
+
+static void my_meminfo(RESULT * result, RESULT * arg1)
+{
+    char *key, *val;
+
+    if (parse_meminfo() < 0) {
+	SetResult(&result, R_STRING, "");
+	return;
+    }
+
+    key = R2S(arg1);
+    val = hash_get(&MemInfo, key, NULL);
+    if (val == NULL)
+	val = "";
+
+    SetResult(&result, R_STRING, val);
+}
+
+
+int plugin_init_meminfo(void)
+{
+    hash_create(&MemInfo);
+    AddFunction("meminfo", 1, my_meminfo);
+    return 0;
+}
+
+
+void plugin_exit_meminfo(void)
+{
+    if (stream != NULL) {
+	fclose(stream);
+	stream = NULL;
+    }
+    hash_destroy(&MemInfo);
+}