Create three child processes by a parent process
Okay I am trying to write a program where a parent process creates three child processes. Also waits for each of them to finish. Here is my code:
#include <stdio.h>
#include <unistd.h>
main() {
int i;
// create 3 child processes
for (i = 0; i < 3; i++) {
if (fork() == 0) {
printf("Child process no.%d with ID: %d created from parent process\n", i);
break;
}
}
// wait for each child process to finish
}
There is one error line "if (fork() == 0) {"
What is wrong with that? I tried to run it using Dev-C++.
How do I build the wait() for each of those three child processes to finish?
By the way, is there any software that allow me to use a virtual terminal (aka command) Unix/Linux on Windows?
boiishuvo
Junior Poster in Training
65 posts since Jun 2009
Reputation Points: 10
Solved Threads: 0
I don't see anything wrong with the line 9. Can you post an error message?
I do see however an error at line 10 - missing parameter for the second %d
The error message says,
"In function 'int main()':
9 line - 'fork' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)"
Ok thanks for telling me that error at line 10.
Um so I wrote to create 3 child processes, how do I make each child to work themselves, and let each of them finish using wait()?
boiishuvo
Junior Poster in Training
65 posts since Jun 2009
Reputation Points: 10
Solved Threads: 0
> 'fork' undeclared (first use this function)
This is really surprising. Is it the only error message? Does it maybe complain about unistd.h not being found?
No really.
Dev-C++ is for MS Windows, and Windows do not have the ability of forking, regardless of how many header files we include.
Aia
Nearly a Posting Maven
2,392 posts since Dec 2006
Reputation Points: 2,224
Solved Threads: 218
