github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/cgoutils/utils.go (about)

     1  //  Copyright (c) 2017-2018 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cgoutils
    16  
    17  // #include <stdlib.h>
    18  import "C"
    19  import (
    20  	"github.com/uber/aresdb/utils"
    21  	"unsafe"
    22  )
    23  
    24  // DoCGoCall is the function wrapper to call a cgo function, check whether there is any exception thrown by the function
    25  // and converted it to a golang error if any.
    26  func DoCGoCall(f func() (uintptr, unsafe.Pointer)) uintptr {
    27  	res, pStrErr := f()
    28  	if pStrErr != nil {
    29  		errMsg := C.GoString((*C.char)(pStrErr))
    30  		C.free(pStrErr)
    31  		panic(utils.StackError(nil, errMsg))
    32  	}
    33  	return res
    34  }