[질문] GDB Attach문 공부중에 질문드립니다.

#include

int main (void)
{
unsigned int sum = 0, j;

while (1) {j++;}

sum = 5 + j;
printf("sum, i = %d\t%d\n", sum, j);

return 0;
}

위에 소스를 attach 하던중에 궁금한점이 있는데요,

1) gdb 안에서 while문을 강제종료한 다음에 다음 명령을 시킬 수 없나요?

2) j값을 임의의 값을 넣은 다음에 sum 값을 볼 수 없나요?

3) j 값에 따른 sum 값을 볼 수 없나요?

4) 위에 소스를 j를 i로 바꾸고 gdb 에서 set i = 0 이런식으로 하면 아래와 같이 구문에러가 뜨는데요. 왜그렇죠?

josh@atFS:~/gdb/atc> gcc -g atc.c
josh@atFS:~/gdb/atc> ls
a.out atc.c
josh@atFS:~/gdb/atc> ./a.out &
[1] 5707
josh@atFS:~/gdb/atc> gdb a.out
GNU gdb 6.2.1
Copyright 2004 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 "i586-suse-linux"...Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) attach 5707
Attaching to program: /home/josh/gdb/atc/a.out, process 5707
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
0x080483ad in main () at atc.c:7
7 while (1) {i++;}
(gdb) p i
$1 = 981097437
(gdb) set i = 0
A syntax error in expression, near `= 0'.
(gdb) set i=0
A syntax error in expression, near `=0'.

그럼 답변 부탁드립니다.

감사합니다. ^^