Hi,


The attached proposed patch adds multi process debugging feature in AIX.”

Till now AIX supported debugging only one inferior at a time, now we can be able to debug multi process.

Users can use set follow fork mode in child or parent and set detach on fork on or off to enable/disable simultaneous debugging of parent/child.


An example program is written below as follows with the gdb output:

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>



void hello_from_child(){

  printf("Hello from child \n");

}



void hello_from_parent(){

  printf("Hello from Parent \n");

}



int main(){

  pid_t childpid;

  printf("I should not be printed after fork as I am executed \n");

  childpid = fork();

  if (childpid == 0)

   hello_from_child();

  else

    hello_from_parent();



  return 0;

}



GDB Output:-



(gdb) b hello_from_child

Breakpoint 1 at 0x10000584: file test_fork.c, line 6.

(gdb) set follow-fork-mode child

(gdb) set detach-on-fork off

(gdb) r

Starting program: /home/test_fork

I should not be printed after fork as I am executed

[Attaching after process 23331156 fork to child process 23134700]

[New inferior 2 (process 23134700)]

[Switching to process 23134700]



Thread 2.1 hit Breakpoint 1, hello_from_child ()

    at test_fork.c:6

6         printf("Hello from child \n");

(gdb) c

Continuing.

Hello from child

[Inferior 2 (process 23134700) exited normally]

(gdb)





The following are the results after running the "gdb.base" test suite:-



With patch



# of expected passes            26584
# of unexpected failures        3968
# of unexpected successes       1
# of expected failures          17
# of known failures             26
# of unresolved testcases       109
# of untested testcases         79
# of unsupported tests          62
# of paths in test names        1
# of duplicate test names       2



Without patch



# of expected passes 26244
# of unexpected failures 4230
# of unexpected successes 1
# of expected failures 17
# of known failures 26
# of unresolved testcases 110
# of untested testcases 79
# of unsupported tests 62
# of paths in test names 1
# of duplicate test names 4




Please find attached the patch [See file: 0001-Enable-multi-process-debugging-for-AIX.patch]


I have left comments in my patch to make it easy to understand and justify [code lines] the same. Let me know what you think.


Kindly give us feedback at the earliest.

Have a nice day ahead.


Thanks and regards,

Aditya.

Bye.