| // Copyright 2015 CoreOS, Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // +build linux |
| |
| package dlopen |
| |
| // #include <string.h> |
| // #include <stdlib.h> |
| // |
| // int |
| // my_strlen(void *f, const char *s) |
| // { |
| // size_t (*strlen)(const char *); |
| // |
| // strlen = (size_t (*)(const char *))f; |
| // return strlen(s); |
| // } |
| import "C" |
| |
| import ( |
| "fmt" |
| "unsafe" |
| ) |
| |
| func strlen(libs []string, s string) (int, error) { |
| h, err := GetHandle(libs) |
| if err != nil { |
| return -1, fmt.Errorf(`couldn't get a handle to the library: %v`, err) |
| } |
| defer h.Close() |
| |
| f := "strlen" |
| cs := C.CString(s) |
| defer C.free(unsafe.Pointer(cs)) |
| |
| strlen, err := h.GetSymbolPointer(f) |
| if err != nil { |
| return -1, fmt.Errorf(`couldn't get symbol %q: %v`, f, err) |
| } |
| |
| len := C.my_strlen(strlen, cs) |
| |
| return int(len), nil |
| } |