Dear NS-users,
This is a mysterious queue access problem.
>From Mac802_11, I need to access link layer queue variables. Naturally,
I tried
In mac/mac-802_11.cc,
LL *l = (LL *)uptarget_;
fprintf(stdout,"Queue Lnegth: %d\n",l->ifq()->length());
Result is segmentation fault. I believe I access (LL *)uptarget_
without difficulty.
Also according to GDB, "l->ifq()" is a proper (Queue *) instance.
Whenever I try to access any of the member function of ifq(), I get seg
fault.
I will appreciate it if you have a quick look and provide a 2 line solution.
Thank you,
Jiwoong
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This GDB was configured as "x86_64-redhat-linux-gnu"...Using host
libthread_db library "/lib64/libthread_db.so.1".
(gdb) ns j
Undefined command: "ns". Try "help".
(gdb) run j
Starting program: /root/ns-allinone-2.30/bin/ns j
num_nodes is set 2
Starting Simulation...
Program received signal SIGSEGV, Segmentation fault.
0x000000000048e55e in Queue::length (this=0x300000003) at
./queue/queue.h:134
134 int length() { return pq_->length(); } /* number of
pkts currently in
(gdb) up
#1 0x00000000004e9621 in Mac802_11::send (this=0xda3690, p=0xe28f00,
h=0xda6b00) at mac/mac-802_11.cc:2237
2237 fprintf(stdout,"Queue Lnegth: %d\n",l->ifq()->length());
(gdb) display l
1: l = (class LL *) 0xdc0580
(gdb)
