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authorReinhard Tartler <siretart@tauware.de>2011-04-27 19:24:15 +0200
committerReinhard Tartler <siretart@tauware.de>2011-04-27 19:24:15 +0200
commit181cec4348da40331b3e8ab365732c025ec149b2 (patch)
treee2e749be67c8253a8096aaf92aab9c51f1a17f7f /plugin_netdev.c
downloadlcd4linux-181cec4348da40331b3e8ab365732c025ec149b2.tar.gz
Import upstream version 0.11.0~svn1143
Diffstat (limited to 'plugin_netdev.c')
-rw-r--r--plugin_netdev.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/plugin_netdev.c b/plugin_netdev.c
new file mode 100644
index 0000000..2f7e13c
--- /dev/null
+++ b/plugin_netdev.c
@@ -0,0 +1,190 @@
+/* $Id: plugin_netdev.c 840 2007-09-09 12:17:42Z michael $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_netdev.c $
+ *
+ * plugin for /proc/net/dev 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_netdev (void)
+ * adds functions to access /proc/net/dev
+ *
+ */
+
+
+#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 "qprintf.h"
+#include "hash.h"
+
+
+static HASH NetDev;
+static FILE *Stream = NULL;
+static char *DELIMITER = " :|\t\n";
+
+static int parse_netdev(void)
+{
+ int age;
+ int row, col;
+ static int first_time = 1;
+
+ /* reread every 10 msec only */
+ age = hash_age(&NetDev, NULL);
+ if (age > 0 && age <= 10)
+ return 0;
+
+ if (Stream == NULL)
+ Stream = fopen("/proc/net/dev", "r");
+ if (Stream == NULL) {
+ error("fopen(/proc/net/dev) failed: %s", strerror(errno));
+ return -1;
+ }
+
+ rewind(Stream);
+ row = 0;
+
+ while (!feof(Stream)) {
+ char buffer[256];
+ char dev[16];
+ char *beg, *end;
+ unsigned int len;
+
+ if (fgets(buffer, sizeof(buffer), Stream) == NULL)
+ break;
+
+ switch (++row) {
+
+ case 1:
+ /* skip row 1 */
+ continue;
+
+ case 2:
+ /* row 2 used for headers */
+ if (first_time) {
+ char *RxTx = strrchr(buffer, '|');
+ first_time = 0;
+ col = 0;
+ beg = buffer;
+ while (beg) {
+ char key[32];
+
+ while (strchr(DELIMITER, *beg))
+ beg++;
+ if ((end = strpbrk(beg, DELIMITER)) != NULL)
+ *end = '\0';
+ qprintf(key, sizeof(key), "%s_%s", beg < RxTx ? "Rx" : "Tx", beg);
+ hash_set_column(&NetDev, col++, key);
+ beg = end ? end + 1 : NULL;
+ }
+ }
+ continue;
+
+ default:
+ /* fetch interface name (1st column) as key */
+ beg = buffer;
+ while (*beg && *beg == ' ')
+ beg++;
+ end = beg + 1;
+ while (*end && *end != ':')
+ end++;
+ len = end - beg;
+ if (len >= sizeof(dev))
+ len = sizeof(dev) - 1;
+ strncpy(dev, beg, len);
+ dev[len] = '\0';
+
+ hash_put_delta(&NetDev, dev, buffer);
+ }
+ }
+
+ return 0;
+}
+
+static void my_netdev(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
+{
+ char *dev, *key;
+ int delay;
+ double value;
+
+ if (parse_netdev() < 0) {
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+
+ dev = R2S(arg1);
+ key = R2S(arg2);
+ delay = R2N(arg3);
+
+ value = hash_get_regex(&NetDev, dev, key, delay);
+
+ SetResult(&result, R_NUMBER, &value);
+}
+
+static void my_netdev_fast(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
+{
+ char *dev, *key;
+ int delay;
+ double value;
+
+ if (parse_netdev() < 0) {
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+
+ dev = R2S(arg1);
+ key = R2S(arg2);
+ delay = R2N(arg3);
+
+ value = hash_get_delta(&NetDev, dev, key, delay);
+
+ SetResult(&result, R_NUMBER, &value);
+}
+
+
+int plugin_init_netdev(void)
+{
+ hash_create(&NetDev);
+ hash_set_delimiter(&NetDev, " :|\t\n");
+
+ AddFunction("netdev", 3, my_netdev);
+ AddFunction("netdev::fast", 3, my_netdev_fast);
+ return 0;
+}
+
+void plugin_exit_netdev(void)
+{
+ if (Stream != NULL) {
+ fclose(Stream);
+ Stream = NULL;
+ }
+ hash_destroy(&NetDev);
+}