Merhabalar,
Bu sefer de cok ufak bir sorun icin sizleri rahatsiz
ediyorum. freebsd ile alakali degil ama...
programda (char *) tipi bir degiskenin NULL olup olmadigini bi
yerde kontrol etmem gerekiyor.
ancak SEGMENTATION FAULT aliyorum. bunun nedenini incelemeye
calistim.
GNU DEBUGGERda olmasa napariz acaba :))
ben ilgili kodlari yazayim:
>>>>>>>>>>>>>
Line154: char *client_sid; /* acaba bir degeri
olmayinca bellekte yer ayirmiyor mu diye dusundum, degerini " "'a
esitledim yine olmadi :) */
...
Line222: query_string = strtop(tmp_str, "$\n");
Line223: client_sid = strtok(NULL, "$\n");
Line224: if
(*client_sid==NULL)
Line225:
*client_sid='$';
...
>>>>>>>>>>>>>
gdb ciktisinda bir nokta dikkatimi cekti :
>> (gdb) display *client_sid
>> 1: *client_sid = Error
accessing memory address 0x0: Bad address.
nedeni neden olabilir ki acaba?
gdb ciktisi asagida:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
kitap# gdb ipfwadmin 16848
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002
Free Software Foundation, Inc.
GDB is free software, covered by the GNU
General Public License, and you are
welcome to change it and/or distribute
copies of it under certain conditions.
Type "show copying" to see the
conditions.
There is absolutely no warranty for GDB. Type "show
warranty" for details.
This GDB was configured as
"i386-undermydesk-freebsd"...
Attaching to program:
/usr/home/ryland/ogren_c/new_ipfwadmin/ipfwadmin, process 16848
Reading
symbols from /usr/lib/libc.so.5...done.
Loaded symbols for
/usr/lib/libc.so.5
Reading symbols from
/usr/libexec/ld-elf.so.1...done.
Loaded symbols for
/usr/libexec/ld-elf.so.1
0x280ba4c3 in accept () from
/usr/lib/libc.so.5
(gdb) break 224
Breakpoint 1 at 0x804961e: file
ipfwadmin.c, line 224.
(gdb) continue
Continuing.
Breakpoint 1, accept_request (client=5) at
ipfwadmin.c:224
224 if (*client_sid==NULL)
(gdb) display *client_sid
1: *client_sid = Error accessing memory
address 0x0: Bad address.
Disabling display 1 to avoid infinite
recursion.
(gdb) display client_sid
2: client_sid = 0x0
(gdb) display
&client_sid
3: &client_sid = (char **) 0xbfbfeacc
(gdb)
step
Program received signal SIGSEGV, Segmentation fault.
0x08049624 in
accept_request (client=5) at
ipfwadmin.c:224
224 if (*client_sid==NULL)
3: &client_sid = (char **) 0xbfbfeacc
2: client_sid = 0x0
(gdb)
Program terminated with signal SIGSEGV, Segmentation fault.
The
program no longer exists.
(gdb)
q
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Su ufak tefek sorunlari atlatabilirsem program bu gece bitecek :)
saygilar.tar.gz
Ozkan KIRIK
