Thread: Processes

Hi everyone first of all i want to thank.
fnoyan
http://www.advancedlinuxprogramming....04-threads.pdf

He mention this link and it has been helpful with what i have been working on. Our class is specially dealing with Processes which will be chapter 3 of this book. This the program i want to output that is attached.

I am stuck in this part where i need to do the Printing System Process Chart using “ps -al”

When it prints the ps -all it does not give me the same output. Why do you think is not printing the same output?

this is the code i have so far:

Code:

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main ()
{
  pid_t child_pid;
  int return_value; // return value to show the system process using "ps -all"

  printf("Iam a process. \b\n");
  printf ("My PID is %d and my parent's PID is %d \b\n", (int)getpid (),(int)getppid ());
           // getpid(): returns the process ID of the current process.
           // getppid(): returns the process ID of the parent of the current process
printf("Forking a child off \b\n");
  child_pid = fork(); //creating the child
  if (child_pid != 0)
     {
       printf("Child: I have been created!\b\n");
       printf("I created a child and its PID is %d \b\n", (int) child_pid);  // childs proccess ID (PID)
       printf("Printing System Process chart using \"ps -al\" \b\n");
     }
  else
      {
         printf("this is the child process, with id %d\n",(int) getpid ()); // returning to step 3 in program II
      }


  return_value = system ("ls -all /");
  //return return_value;

  return 0;
}

Thanks

Wise_ron

Originally Posted by wise_ron

I am stuck in this part where i need to do the Printing System Process Chart using “ps -al”

Code:

  return_value = system ("ls -all /");

Um, did you mean ps -all instead of ls -all???

Code:

i meant ps -all

I still dont get the output that i want. Can someone explain how the ps works and give me a basic example.

Thanks