Library that has reference to fork() in C

Question

What is the library that defines fork(). I am learning to use fork(). I found out that the Standard I/O Library : stdio.h is enough for fork() to work but that does not apply in my case.

I am using gcc in Code::Blocks on Windows 8 Pro

My Code is:

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<malloc.h>
#include <time.h>

int main(void)
{

    pid_t process;
    process = fork();

    if(process< 0)
    {
        printf("fork failed");
    }
    if(process > 0)
    {
        printf("\nParent Process Executed");
    }

    if(process == 0)
    {
        printf("\nChild Process Executed");
    }
    return 0 ;
}

The Exact Error I get is:

useoffork.o:useoffork.c:(.text+0xf): undefined reference to `fork'

this may help you man fork...http://linux.die.net/man/2/fork — Omkant, Nov 30 '12 at 10:26
possible duplicate of [Undefined reference to fork() in Code::Blocks editor in Windows OS](http://stackoverflow.com/questions/8819673/undefined-reference-to-fork-in-codeblocks-editor-in-windows-os) — Rohan, Dec 01 '12 at 10:13

iabdalkader · Accepted Answer · 2012-11-30T10:54:52.077

4

The C standard library (glibc) implements fork() which calls a UNIX/Linux-specific system call eventually to create a process, on Windows, you should use the winapi CreateProcess() see this example in MSDN.

Note: Cygwin fork() is just a wrapper around CreateProcess() see How is fork() implemented?

edited Nov 30 '12 at 10:54

answered Nov 30 '12 at 10:30

iabdalkader

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what should i include for that? @mux ? – cipher Nov 30 '12 at 10:33
@cipher the link has an example – iabdalkader Nov 30 '12 at 10:34
i needed basic thing in `C` And your link is regarding `C++` . Anywaysm Thanks for the help. – cipher Nov 30 '12 at 10:36
@cipher no it's not C++ specific, see this [example](http://msdn.microsoft.com/en-us/library/windows/desktop/ms682512%28v=vs.85%29.aspx) – iabdalkader Nov 30 '12 at 10:38
1

Actually, `fork()` is a Unix thing, it's specified by POSIX (and SVr4 and BSD, see [the manual page](http://linux.die.net/man/2/fork). It's not part of the C standard. – unwind Nov 30 '12 at 10:43
@unwind I didn't say it's standard C I said the C standard library usually implements it :) – iabdalkader Nov 30 '12 at 10:44
@cipher You should accept this answer instead of mine. It's more informative. – cnicutar Nov 30 '12 at 10:47
If that's what you yourself say. I will go with that – cipher Nov 30 '12 at 10:47

score 3 · Answer 2 · answered Nov 30 '12 at 10:27

3

I am using gcc in Code::Blocks on Windows 8 Pro

You don't have fork on windows. You can use cygwin or something like that though.

answered Nov 30 '12 at 10:27

cnicutar

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alternate solution for windows without using cygwin? – MOHAMED Nov 30 '12 at 10:30
1

@MohamedKALLEL Don't use `fork`. – cnicutar Nov 30 '12 at 10:31

score 2 · Answer 3 · edited Mar 20 '21 at 15:45

2

#include <unistd.h>

The C library defines fork().

It is the UNIX/Linux-specific system calls to create a process, on linux etc.

edited Mar 20 '21 at 15:45

Syscall

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answered Mar 20 '21 at 08:39

Rana Muhammad Usama

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Library that has reference to fork() in C

3 Answers3

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