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// Copyright 2015 RedHat, Inc.
// 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.
package sdjournal
import (
"github.com/coreos/go-systemd/v22/internal/dlopen"
"sync"
"unsafe"
)
var (
// lazy initialized
libsystemdHandle *dlopen.LibHandle
libsystemdMutex = &sync.Mutex{}
libsystemdFunctions = map[string]unsafe.Pointer{}
libsystemdNames = []string{
// systemd < 209
"libsystemd-journal.so.0",
"libsystemd-journal.so",
// systemd >= 209 merged libsystemd-journal into libsystemd proper
"libsystemd.so.0",
"libsystemd.so",
}
)
func getFunction(name string) (unsafe.Pointer, error) {
libsystemdMutex.Lock()
defer libsystemdMutex.Unlock()
if libsystemdHandle == nil {
h, err := dlopen.GetHandle(libsystemdNames)
if err != nil {
return nil, err
}
libsystemdHandle = h
}
f, ok := libsystemdFunctions[name]
if !ok {
var err error
f, err = libsystemdHandle.GetSymbolPointer(name)
if err != nil {
return nil, err
}
libsystemdFunctions[name] = f
}
return f, nil
}
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