when a child process is created using fork() system call, where the child process starts execution?

Asked Nov 04 '17 at 02:31

Active Nov 04 '17 at 02:33

Viewed 36 times

The problem is that, I have read that the child process will start execution after the fork() system call but then here I must get "This is for sure Parent" only once if the child starts from fork() but as the output shows, it's printing twice.

#include  <stdio.h> 

int main(void)
{
  printf("This is for sure parent\n");
  fork();
  printf("This maybe child or parent\n");
  return 0;
}

Here is the Output:

This is for sure parent
This maybe child or parent
This is for sure parent
This maybe child or parent

edited Nov 04 '17 at 02:33

Jack

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asked Nov 04 '17 at 02:31

Haroon khan

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do not believe printf – asio_guy Nov 04 '17 at 02:35
3

That's because without flushing both processes get their copy of stdio buffer. – Jack Nov 04 '17 at 02:35
fflush(stdout) before fork() – DeepakKg Nov 04 '17 at 02:50
Does the buffer need to be flushed if the printf ends with a newline character? – Christian Gibbons Nov 04 '17 at 03:17
no becuase stdout is line buffered @ChristianGibbons – yakout Nov 04 '17 at 12:09

when a child process is created using fork() system call, where the child process starts execution?

0 Answers0