go-ml-dev/dyl

// +build !windows

package dyl

/*
#cgo LDFLAGS: -ldl
#include <dlfcn.h>
#include <stdlib.h>
*/
import "C"

import (
    "golang.org/x/xerrors"
    "os/user"
    "unsafe"
)

func loadLibrary(dlname string) (uintptr, error) {
    s := C.CString(dlname)
    defer C.free(unsafe.Pointer(s))
    h := C.dlopen(s, C.RTLD_LAZY)
    if h == nil {
        return 0, xerrors.Errorf("failed to load dynamic library")
    }
    return uintptr(h), nil
}

func bindFunction(h uintptr, funcname string, p unsafe.Pointer) error {
    n := C.CString(funcname)
    defer C.free(unsafe.Pointer(n))
    fp := uintptr(C.dlsym(unsafe.Pointer(h), n))
    if fp == 0 {
        return xerrors.Errorf("dynamic library does not have symbol %v", funcname)
    }
    q := (*uintptr)(p)
    (*q) = fp
    return nil
}

func expandCache(s string) string {
    usr, err := user.Current()
    if err != nil {
        panic(err.Error())
    }
    return usr.HomeDir + "/.cache/" + s
}