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author | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
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committer | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
commit | a031b83a09a8628435317a03f199cdc18b78262f (patch) | |
tree | bc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/github.com/coreos/pkg/dlopen/dlopen.go | |
parent | 2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff) | |
download | podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.gz podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.bz2 podman-a031b83a09a8628435317a03f199cdc18b78262f.zip |
Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/github.com/coreos/pkg/dlopen/dlopen.go')
-rw-r--r-- | vendor/github.com/coreos/pkg/dlopen/dlopen.go | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/vendor/github.com/coreos/pkg/dlopen/dlopen.go b/vendor/github.com/coreos/pkg/dlopen/dlopen.go new file mode 100644 index 000000000..23774f612 --- /dev/null +++ b/vendor/github.com/coreos/pkg/dlopen/dlopen.go @@ -0,0 +1,82 @@ +// Copyright 2016 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 dlopen provides some convenience functions to dlopen a library and +// get its symbols. +package dlopen + +// #cgo LDFLAGS: -ldl +// #include <stdlib.h> +// #include <dlfcn.h> +import "C" +import ( + "errors" + "fmt" + "unsafe" +) + +var ErrSoNotFound = errors.New("unable to open a handle to the library") + +// LibHandle represents an open handle to a library (.so) +type LibHandle struct { + Handle unsafe.Pointer + Libname string +} + +// GetHandle tries to get a handle to a library (.so), attempting to access it +// by the names specified in libs and returning the first that is successfully +// opened. Callers are responsible for closing the handler. If no library can +// be successfully opened, an error is returned. +func GetHandle(libs []string) (*LibHandle, error) { + for _, name := range libs { + libname := C.CString(name) + defer C.free(unsafe.Pointer(libname)) + handle := C.dlopen(libname, C.RTLD_LAZY) + if handle != nil { + h := &LibHandle{ + Handle: handle, + Libname: name, + } + return h, nil + } + } + return nil, ErrSoNotFound +} + +// GetSymbolPointer takes a symbol name and returns a pointer to the symbol. +func (l *LibHandle) GetSymbolPointer(symbol string) (unsafe.Pointer, error) { + sym := C.CString(symbol) + defer C.free(unsafe.Pointer(sym)) + + C.dlerror() + p := C.dlsym(l.Handle, sym) + e := C.dlerror() + if e != nil { + return nil, fmt.Errorf("error resolving symbol %q: %v", symbol, errors.New(C.GoString(e))) + } + + return p, nil +} + +// Close closes a LibHandle. +func (l *LibHandle) Close() error { + C.dlerror() + C.dlclose(l.Handle) + e := C.dlerror() + if e != nil { + return fmt.Errorf("error closing %v: %v", l.Libname, errors.New(C.GoString(e))) + } + + return nil +} |