#include <stdio.h>
#include <unistd.h>

extern char **environ;

// simple example of program replacing itself with exec
int main(void) {
    printf("In exec.c %d\n", getpid());
    printf("In exec.c parent is %d.\n", getppid());
    char *argv[] = {"./process_example", NULL}; 
    execve("./process_example", argv, environ);

    // if we get here there has been an error
    perror("execve");
    return 1;
}