How to terminate a child process which is running another program by doing exec

Question

I\'m doing fork in my main program,and doing exec in the child process which will run another program. Now i want to terminate the child(i.e., the program invoked by exec) and r

Answer 1

Either in or outside your program, it is possible to use kill. By including , you can kill a process with a given PID (use the fork return value to do this).

#include 

int pid;

switch (pid = fork())
{
case -1:
  /* some stuff */
  break;
case 0: 
  /* some stuff */
  break;
default:
  /* some stuff */
  kill(pid, SIGTERM);
}

It is also possible to use kill command in the shell. To find the PID of your child process, you can run ps command.

man kill
The kill() function shall send a signal to a process or a group of processes specified by pid. The signal to be sent is specified by sig and is either one from the list given in or 0. If sig is 0 (the null signal), error checking is performed but no signal is actually sent. The null signal can be used to check the validity of pid.