Minimal Linux and Windows process spawn test

minimal_fork_test.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef _WIN32
	#include <process.h> /* Required for _spawnv */
	#include <windows.h>
	/* We make getpid() work in a similar 
		way on Windows as it does on Linux */
	#define getpid() GetCurrentProcessId()
#endif
#ifdef __linux__
	#include <unistd.h>
#endif

void spawn_new_process(char * const *argv);
int pid;

int main(int argc, char *argv[])
{
	pid = getpid();
	if(argc > 1 && strcmp(argv[1],"the_new_process") == 0)
	{
		printf("[%d] This is a new process, and not a fork.\n", pid);
	}	
	else
	{
		printf("[%d] This is the original process.\n", pid);
		char *new_args[2];
		new_args[0] = argv[0];
		new_args[1] = "the_new_process";
		spawn_new_process((char * const *)new_args);
	}
	return(0);
}

void spawn_new_process(char * const *argv)
{
	#ifdef _WIN32
		/* This code block will also be reached on a 
		   64 bit version of a Windows desktop OS */
		_spawnv(_P_NOWAIT, argv[0], (const char * const *)argv);
	#endif
	
	
	#ifdef __linux__
		pid = getpid();
	
		/* Create copy of current process */
		pid = fork();
	
		/* The parent`s new pid will be 0 */
		if(pid != 0)
		{
			/* We are now in a child progress 
			   Execute different process */
			printf("[%d] Child (fork) process will call exec.\n",
				 pid);
			execv(argv[0], argv);

		
			/* This code will never be executed */
			printf("[%d] Child (fork) process is exiting.\n", pid);
			exit(EXIT_SUCCESS);
		}
	#endif

	/* We are still in the original process */
	printf("[%d] Original process is exiting.\n", pid);
	exit(EXIT_SUCCESS);
}