package main

/*
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>

void executeCmd(const char* cmd)
{
    FILE *fp;
    char buf[1024];
    int readSize;
    int bufSize;

    bufSize = sizeof(buf) - 1;
    fp = popen(cmd, "r");
    if (fp != NULL)
    {
        while(1)
        {
            readSize = fread(buf, sizeof(char), bufSize, fp);
            if(readSize <= 0)
            {
                break;
            }

            buf[readSize] = '\0';
            printf("%s", buf);
        }

        pclose(fp);
    }
    else
        printf("executeCmd popen null:%s\n",strerror(errno));
}
*/
import "C"

import (
    "fmt"
    "os/exec"
    "unsafe"
)

func RunExecCommand() {
    fmt.Println("RunExecCommand")
    bs, err := exec.Command("docker", "run ubuntu:14.04 echo hello").Output()
    if err != nil {
        fmt.Println("docker error:", err)
    } else {
        text := string(bs)
        fmt.Println(text)
    }
}

func RunCPopen() {
    fmt.Println("RunCPopen")

    gostr := "docker run ubuntu:14.04 echo hello"
    cstr := C.CString(gostr)
    C.executeCmd(cstr)
    C.free(unsafe.Pointer(cstr))
}

func main() {
    RunExecCommand()
    RunCPopen()
}