GDB-following child process with gdb

["DEEPAK E P" <deepak dot embar at wipro dot com>]

Hi ,

  I have a red hat linux system.
uname -a
Linux 2.2.14-12smp #1 SMP Tue Apr 25 12:58:06 EDT 2000 i686 unknown

 

gdb --version
GNU gdb 19991004
Copyright 1998 Free Software Foundation, Inc

   I have not been able to follow the child process after a fork call.

 

  Tried the following:

 

(gdb) l
1       main()
2       {
3               int j;
4               printf("Hello world\n");
5

6               if (fork() == 0 ) {
7                       printf("Chile process\n");
8               } else {
9                       printf("Parent process\n");
10              }
(gdb) set follow-fork-mode child
(gdb) show follow-fork-mode
Debugger response to a program call of fork or vfork is "child".
(gdb) break 7
Breakpoint 1 at 0x804841e: file junk.c, line 7.
(gdb) r
Hello world
Parent process

 

Program exited with code 017.

Note: I have compiled with -g option :
     gcc -g -o jk junk.c 

Also tried :
(gdb) break fork
Breakpoint 1 at 0x804830c
(gdb) r
Starting program: /home/deepakep/local/./jk
Breakpoint 1 at 0x400abc90
Hello world

 

Breakpoint 1, 0x400abc90 in __libc_fork () from /lib/libc.so.6
(gdb) return 0

 

This also doesnt work.

Do i have to pick up a patch etc ??, or am i missing something here ?

 

Thanks in advance for the help

dk