从go调用C函数

我刚开始学习围棋语言,我开始非常喜欢围棋 语言 要读取阴影文件,我的代码是:

// #cgo CFLAGS: -D_POSIX_SOURCE=1
// #include <stdlib.h>
// #include <shadow.h>
// size_t size_of_shadow() { return sizeof(struct spwd); }
import "C"
import "unsafe"
import "fmt"

type Shadow struct {
    Name   string
    Passwd string
}

func Getspnam(name string) (*Shadow, error) {
    cname := C.CString(name)
    cspwd := (*C.struct_passwd)(C.malloc(C.size_of_shadow()))
    buf := (*C.char)(C.malloc(1024))
    _, err := C.getspnam_r(cname, cspwd, 1024, &cpwd)

    if unsafe.Pointer(cspwd) == unsafe.Pointer(uintptr(0)) {
        C.free(unsafe.Pointer(cname))

        if err == nil {
            err = fmt.Errorf("User %s not found", name)
        }

        return nil, err
    }

    s := Shadow{
        Name: C.GoString(cspwd.sp_namp),
        Passwd: C.GoString(cspwd.sp_pwdp),
    }

    C.free(unsafe.Pointer(cname))
    C.free(unsafe.Pointer(cspwd))
    C.free(unsafe.Pointer(buf))

    return &s, nil
}

灵感来自这个小项目和 课程:

https://github.com/LTD-Beget/passwd http://linux.die.net/man/3/getspnam

我使用的是debian拉伸go 1.6版本,安装了包管理器。 尝试编译文件时出错:

could not determine kind of name for C.getspnam_r

但当我打开头文件阴影时。h、 然而,该功能在 文件。