/*

$ dcc set_status.c -o set_status
$ dcc get_status.c -o get_status
$ ./set_status
Environment variable 'STATUS' has value 'great'
$

*/
#include <stdio.h>
#include <stdlib.h>
#include <spawn.h>
#include <sys/wait.h>
#include <errno.h>

// simple example of setting an environment variable
int main(void) {

    // set environment variable STATUS
    setenv("STATUS", "great", 1);

    char *getenv_argv[] = {"./get_status", NULL};
    pid_t pid;
    extern char **environ;
    int ret = posix_spawn(&pid, "./get_status", NULL, NULL, 
    	      getenv_argv, environ);
    if (ret != 0) {
        errno = ret;
        perror("spawn");
        return 1;
    }  
    
    
    int exit_status;
    if (waitpid(pid, &exit_status, 0) == -1) {
        perror("waitpid");
        exit(1);
    }

    // exit with whatever status s exited with
    return exit_status;
}