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package dl
import (
"errors"
"unsafe"
)
//#cgo LDFLAGS: -ldl
//#include <stdlib.h>
//#include <dlfcn.h>
import "C"
type Flag int
const (
RTLD_LAZY Flag = C.RTLD_LAZY // Relocations are performed at an
// implementation-defined time.
RTLD_NOW Flag = C.RTLD_NOW // Relocations are performed when the
// object is loaded.
RTLD_GLOBAL Flag = C.RTLD_GLOBAL // All symbols are available for
// relocation processing of other
// modules.
RTLD_LOCAL Flag = C.RTLD_LOCAL // All symbols are not made available
// for relocation processing by other
// modules.
)
type Handle struct {
c unsafe.Pointer
}
func Open(name string, flags Flag) (Handle, error) {
nameC := C.CString(name)
defer C.free(unsafe.Pointer(nameC))
dlerror()
ptr := C.dlopen(nameC, C.int(flags))
if ptr == nil {
return Handle{}, dlerror()
}
return Handle{ptr}, nil
}
// This returns uintptr instead of unsafe.Pointer so that code using
// reflect cannot obtain unsafe.Pointers without importing the unsafe
// package explicitly.
func (h Handle) Sym(symbol string) (uintptr, error) {
symbolC := C.CString(symbol)
defer C.free(unsafe.Pointer(symbolC))
dlerror()
ptr := C.dlsym(h.c, symbolC)
if ptr == nil {
return 0, dlerror()
}
return uintptr(ptr), nil
}
func (h Handle) Close() error {
dlerror()
r := C.dlclose(h.c)
if r != 0 {
return dlerror()
}
return nil
}
func dlerror() error {
strC := C.dlerror()
if strC == nil {
return nil
}
return errors.New(C.GoString(strC))
}
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