dlfcn_cgo_unix.go RawHistoryFolder

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
3
4//go:build freebsd || linux || netbsd
5
6package cgo
7
8/*
9#cgo !netbsd LDFLAGS: -ldl
10
11#include <dlfcn.h>
12#include <stdlib.h>
13*/
14import "C"
15
16import (
17	"errors"
18	"unsafe"
19)
20
21func Dlopen(filename string, flag int) (uintptr, error) {
22	cfilename := C.CString(filename)
23	defer C.free(unsafe.Pointer(cfilename))
24	handle := C.dlopen(cfilename, C.int(flag))
25	if handle == nil {
26		return 0, errors.New(C.GoString(C.dlerror()))
27	}
28	return uintptr(handle), nil
29}
30
31func Dlsym(handle uintptr, symbol string) (uintptr, error) {
32	csymbol := C.CString(symbol)
33	defer C.free(unsafe.Pointer(csymbol))
34	symbolAddr := C.dlsym(*(*unsafe.Pointer)(unsafe.Pointer(&handle)), csymbol)
35	if symbolAddr == nil {
36		return 0, errors.New(C.GoString(C.dlerror()))
37	}
38	return uintptr(symbolAddr), nil
39}
40
41func Dlclose(handle uintptr) error {
42	result := C.dlclose(*(*unsafe.Pointer)(unsafe.Pointer(&handle)))
43	if result != 0 {
44		return errors.New(C.GoString(C.dlerror()))
45	}
46	return nil
47}
48
49// all that is needed is to assign each dl function because then its
50// symbol will then be made available to the linker and linked to inside dlfcn.go
51var (
52	_ = C.dlopen
53	_ = C.dlsym
54	_ = C.dlerror
55	_ = C.dlclose
56)