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dlopen.go
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dlopen.go
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// Package dlopen allows preloading dynamic libraries.
package dlopen
/*
#include <dlfcn.h>
#include <stdlib.h>
#cgo LDFLAGS: -ldl
*/
import "C"
import (
"errors"
"fmt"
"os"
"strings"
"unsafe"
)
// Load loads a binary dynamic library.
func Load(filename string) (hdl unsafe.Pointer, e error) {
filenameC := C.CString(filename)
defer C.free(unsafe.Pointer(filenameC))
C.dlerror()
hdl = C.dlopen(filenameC, C.RTLD_LAZY|C.RTLD_GLOBAL)
if err := C.dlerror(); err != nil {
e = errors.New(C.GoString(err))
}
return
}
// LoadGroup loads a .so file that contains a GROUP.
func LoadGroup(groupFilename string) error {
content, e := os.ReadFile(groupFilename)
if e != nil {
return e
}
tokens := strings.Split(string(content), " ")
if len(tokens) < 4 || tokens[0] != "GROUP" || tokens[1] != "(" {
return errors.New("dlopen.LoadGroup parse error")
}
libs := groupError{}
for _, filename := range tokens {
if strings.HasSuffix(filename, ".so") {
libs[filename] = nil
}
}
for {
failed := groupError{}
for filename := range libs {
if _, e := Load(filename); e != nil {
failed[filename] = e
}
}
switch len(failed) {
case 0:
return nil
case len(libs):
// libs in GROUP may have inter-dependencies, but each round should resolve some dependencies
return failed
}
libs = failed
}
}
type groupError map[string]error
func (e groupError) Error() string {
var b []byte
delim := "dlopen.LoadGroup:"
for filename, err := range e {
b = fmt.Appendf(b, "%s %s (%v)", delim, filename, err)
delim = ","
}
return string(b)
}