diff options
Diffstat (limited to 'vendor/github.com/coreos/go-systemd/v22/sdjournal/functions.go')
-rw-r--r-- | vendor/github.com/coreos/go-systemd/v22/sdjournal/functions.go | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/vendor/github.com/coreos/go-systemd/v22/sdjournal/functions.go b/vendor/github.com/coreos/go-systemd/v22/sdjournal/functions.go new file mode 100644 index 000000000..3cbd05658 --- /dev/null +++ b/vendor/github.com/coreos/go-systemd/v22/sdjournal/functions.go @@ -0,0 +1,66 @@ +// 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 +} |