Sending signal to inferior program.

[logitech <supriya.rao17@gmail.com>]

Hi, I am currently working with the gdb source code. I wish to send a signal
to the inferior program at a specific time. I tried forking a thread in
gdb.c which sends signal to the inferior process. To get its pid, I declared
an extern variable shared between gdb.c and linux-nat.c
But this gives a seg fault. Also the signal doesn't seem to get delivered.

In linux-nat.c

if (debug_linux_nat)
    fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n",
target_pid_to_str (ptid));

   gpid=ptid.pid; // gpid gets the pid value, the signal is sent to gpid
from gdb.c

Moreover when i debug this with flag set, gpid initially gets the value of
pid of inferior, but later it becomes -1.

Is there any other way in which I can accomplish this. 
Thanks 
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