[lcd4linux @ 2004-01-25 05:30:08 by reinelt]

plugin_netdev for parsing /proc/net/dev added

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@338 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 148 insertions, 0 deletions

diff --git a/plugin_netdev.c b/plugin_netdev.c
new file mode 100644
index 0000000..2c1b8b9
--- /dev/null
+++ b/plugin_netdev.c
@@ -0,0 +1,148 @@
+/* $Id: plugin_netdev.c,v 1.1 2004/01/25 05:30:09 reinelt Exp $
+ *
+ * plugin for /proc/net/dev parsing
+ *
+ * Copyright 2003 Michael Reinelt <reinelt@eunet.at>
+ * Copyright 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_netdev.c,v $
+ * Revision 1.1  2004/01/25 05:30:09  reinelt
+ * plugin_netdev for parsing /proc/net/dev added
+ *
+ */
+
+/* 
+ * exported functions:
+ *
+ * int plugin_init_netdev (void)
+ *  adds functions to access /proc/net/dev
+ *
+ */
+
+
+#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 NetDev = { 0, };
+
+
+static void hash_set3 (char *key1, char *key2, char *key3, char *val) 
+{
+  char key[32];
+  
+  snprintf (key, sizeof(key), "%s.%s.%s", key1, key2, key3);
+  hash_set_delta (&NetDev, key, val);
+}
+
+
+static int parse_netdev (void)
+{
+  int age;
+  int line;
+  int  RxTx=0; // position of Receive/Transmit switch
+  FILE *stream;
+  
+  // reread every 10 msec only
+  age=hash_age(&NetDev, NULL, NULL);
+  if (age>0 && age<=10) return 0;
+  
+  stream=fopen("/proc/net/dev", "r");
+  if (stream==NULL) {
+    error ("fopen(/proc/net/dev) failed: %s", strerror(errno));
+    return -1;
+  }
+    
+  line=0;
+  while (!feof(stream)) {
+    char buffer[256];
+    char header[256];
+    char *head[32];
+    int  col;
+    
+    if (fgets (buffer, sizeof(buffer), stream) == NULL) break;
+
+    // skip line 1
+    if (++line<2) continue;
+
+    // line 2 used for headers
+    if (line==2) {
+      char *h;
+      strncpy(header, buffer, sizeof(header));
+      RxTx=(strrchr(header, '|') - header);
+      col=0;
+      h=strtok(header, "| \t\n");
+      while (h!=NULL) {
+	head[col++]=h;
+	h=strtok(NULL, "| \t\n");
+      }
+    } else {
+      char *h, *iface=NULL;
+      col=0;
+      h=strtok(buffer, ":| \t\n");
+      while (h!=NULL) {
+	if (col==0) {
+	  iface=h;
+	} else {
+	  hash_set3 (iface, (h-buffer) < RxTx ? "Rx" : "Tx", head[col], h);
+	}
+	h=strtok(NULL, "| \t\n");
+	col++;
+      }
+    }
+  }
+  fclose (stream);
+  return 0;
+}  
+
+static void my_netdev (RESULT *result, RESULT *arg1, RESULT *arg2)
+{
+  char *key;
+  int delay;
+  double value;
+  
+  if (parse_netdev()<0) {
+    SetResult(&result, R_STRING, ""); 
+    return;
+  }
+
+  key   = R2S(arg1);
+  delay = R2N(arg2);
+  
+  value  = hash_get_regex(&NetDev, key, delay);
+  
+  SetResult(&result, R_NUMBER, &value); 
+}
+
+
+int plugin_init_netdev (void)
+{
+  AddFunction ("netdev", 2, my_netdev);
+  return 0;
+}
+