#define _GNU_SOURCE /

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

#define READ 0
#define WRITE 1

pid_t spawn(char *cmdstring);

int main(int argc, char *argv[])
{
    pid_t childpid = spawn("man 2 open");
    return 0;
}

pid_t spawn(char *cmdstring)
{
    int pipefd[2];
    char buf[32], *argv[] = {"/bin/sh", "-c", cmdstring, NULL};
    pid_t pid = fork();

    if (pipe(pipefd) == -1)
    {
        perror("pipe");
        return 1;
    }

    if (pid == -1) // Parent
        perror("fork()");
    if (pid == 0) // child
    {
        if (write(pipefd[WRITE], "child wrote here", sizeof("child wrote here")) < 0)
            perror("write");
        // execv("/bin/sh", argv);
        // perror("execve failed!");
        _exit(123);
    }

    int wstatus;

    if (pid != wait(&wstatus) || !WIFEXITED(wstatus))
        perror("Divorsed");

    if (read(pipefd[WRITE], buf, sizeof(buf)) < 0)
        perror("read");

    printf("%s\n", buf);

    return pid;
}