From 06be6d820f06c59e717cc0adbe1c255c869e05e5 Mon Sep 17 00:00:00 2001
From: Bernd Eckenfels <net-tools@lina.inka.de>
Date: Sun, 25 Nov 2001 06:48:50 +0000
Subject: [PATCH] this fixes Debian Bug #109164 (netstat -ci does only print
 stats once). It also renames add_interface and free_interface list to
 if_cache_add/free. I am not sure if removing the "proc_read" flag will harm
 performance, looks likt this check is never triggereed. Anyway, we need more
 efficient b-search sooner or later.

---
 include/interface.h |  2 +-
 lib/interface.c     | 26 +++++++++++++-------------
 netstat.c           |  4 ++--
 3 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/include/interface.h b/include/interface.h
index f95555c..0685cfc 100644
--- a/include/interface.h
+++ b/include/interface.h
@@ -64,7 +64,7 @@ struct interface {
 extern int if_fetch(struct interface *ife);
 
 extern int for_all_interfaces(int (*)(struct interface *, void *), void *);
-extern int free_interface_list(void);
+extern int if_cache_free(void);
 extern struct interface *lookup_interface(char *name);
 extern int if_readlist(void);
 
diff --git a/lib/interface.c b/lib/interface.c
index eee992b..44d18a7 100644
--- a/lib/interface.c
+++ b/lib/interface.c
@@ -7,7 +7,7 @@
    8/2000  Andi Kleen make the list operations a bit more efficient.
    People are crazy enough to use thousands of aliases now.
 
-   $Id: interface.c,v 1.20 2001/11/24 05:23:35 ecki Exp $
+   $Id: interface.c,v 1.21 2001/11/25 06:48:51 ecki Exp $
  */
 
 #include "config.h"
@@ -91,10 +91,13 @@ static struct interface *int_list, *int_last;
 
 static int if_readlist_proc(char *);
 
-static struct interface *add_interface(char *name)
+static struct interface *if_cache_add(char *name)
 {
     struct interface *ife, **nextp, *new;
 
+    if (!int_list)
+    	int_last = NULL;
+
     for (ife = int_last; ife; ife = ife->prev) {
 	    int n = nstrcmp(ife->name, name); 
 	    if (n == 0) 
@@ -121,7 +124,7 @@ struct interface *lookup_interface(char *name)
 
     if (if_readlist_proc(name) < 0) 
 	    return NULL; 
-    ife = add_interface(name); 
+    ife = if_cache_add(name); 
     return ife;
 }
 
@@ -139,13 +142,14 @@ int for_all_interfaces(int (*doit) (struct interface *, void *), void *cookie)
     return 0;
 }
 
-int free_interface_list(void)
+int if_cache_free(void)
 {
     struct interface *ife;
     while ((ife = int_list) != NULL) {
 	int_list = ife->next;
 	free(ife);
     }
+    int_last = NULL;
     return 0;
 }
 
@@ -188,7 +192,7 @@ static int if_readconf(void)
 
     ifr = ifc.ifc_req;
     for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
-	add_interface(ifr->ifr_name);
+	if_cache_add(ifr->ifr_name);
 	ifr++;
     }
     err = 0;
@@ -300,17 +304,11 @@ static int get_dev_fields(char *bp, struct interface *ife)
 
 static int if_readlist_proc(char *target)
 {
-    static int proc_read; 
     FILE *fh;
     char buf[512];
     struct interface *ife;
     int err;
 
-    if (proc_read) 
-	    return 0; 
-    if (!target) 
-	    proc_read = 1;
-
     fh = fopen(_PATH_PROCNET_DEV, "r");
     if (!fh) {
 		fprintf(stderr, _("Warning: cannot open %s (%s). Limited output.\n"),
@@ -350,7 +348,7 @@ static int if_readlist_proc(char *target)
     while (fgets(buf, sizeof buf, fh)) {
 	char *s, name[IFNAMSIZ];
 	s = get_name(name, buf);    
-	ife = add_interface(name);
+	ife = if_cache_add(name);
 	get_dev_fields(s, ife);
 	ife->statistics_valid = 1;
 	if (target && !strcmp(target,name))
@@ -359,7 +357,6 @@ static int if_readlist_proc(char *target)
     if (ferror(fh)) {
 	perror(_PATH_PROCNET_DEV);
 	err = -1;
-	proc_read = 0; 
     }
 
 #if 0
@@ -371,6 +368,9 @@ static int if_readlist_proc(char *target)
 
 int if_readlist(void) 
 { 
+    /* caller will/should check not to call this too often 
+     *   (i.e. only if int_list!= NULL 
+     */
     int err = if_readlist_proc(NULL); 
     if (!err)
 	    err = if_readconf();
diff --git a/netstat.c b/netstat.c
index 2de1737..1a066b9 100644
--- a/netstat.c
+++ b/netstat.c
@@ -6,7 +6,7 @@
  *              NET-3 Networking Distribution for the LINUX operating
  *              system.
  *
- * Version:     $Id: netstat.c,v 1.44 2001/08/26 05:25:21 ak Exp $
+ * Version:     $Id: netstat.c,v 1.45 2001/11/25 06:48:50 ecki Exp $
  *
  * Authors:     Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
@@ -1457,7 +1457,7 @@ static int iface_info(void)
 	exit(1);
     }
     if (flag_cnt)
-	free_interface_list();
+	if_cache_free();
     else {
 	close(skfd);
 	skfd = -1;
-- 
2.7.4