Programming

How can i run a back ground process....

I.e for example by using fork() i need to run seperate 4 background processes..
How can send a process to background

???

1) If the process is already running,
Press Ctrl + z to suspend it and then give the following command
bg + job number

2) while starting the process follow it with an ampersand

command &

How to run 4 seperate processes in the background, concurrently...
(I.E as background processes.)
by using fork().

(Something like... one parent & 4 concurrently running children)

Fork the main process four times and do exec after forking....
is not that what you are looking for ?

I need to run 4-processes concurrently in the background.
(I.ene parent with 4 concurrently running children.All 4 children should be in the same level.)

Parent
|
|
------- - - - - ----
| | | |
c1 c2 c3 c4 (same level)

I tried like this(code below)...But it doen't do what i want.Pls help me with this code. How can i

do this...
Is there any other easy way of doing this.....?


#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

#define NUM_CHILDREN 4
pid_t children[NUM_CHILDREN];
int i;

for(i=0;i<NUM_CHILDREN;i++){
if( (children[i]=fork()) == 0 ){
sleep(5);/**/
}
sleep(8);/**/
}

How can i verify that there are 4 concurrent processes running in the background?
(Is 'pstree' command OR any other better way! )

how to differentiate processes

If there are 1-parent & 4-concurrent same level children, how to differntiate those Processes.

I.e: 4 child processes should able to call diffenent functions.

Child1 should call function-A while
Child2 should call function-B
Child3 should call function-c
Child4 should call function-D


Can i use pid of processes to do this...
If so how???

Are there any other method.

hello..
is anyone can help me? what is header file of the six exec's process plzzz...?