github.com/panjjo/go@v0.0.0-20161104043856-d62b31386338/src/runtime/cgo/gcc_traceback.c (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build cgo
     6  // +build linux
     7  
     8  #include <stdint.h>
     9  
    10  struct cgoTracebackArg {
    11  	uintptr_t  Context;
    12  	uintptr_t  SigContext;
    13  	uintptr_t* Buf;
    14  	uintptr_t  Max;
    15  };
    16  
    17  // Call the user's traceback function and then call sigtramp.
    18  // The runtime signal handler will jump to this code.
    19  // We do it this way so that the user's traceback function will be called
    20  // by a C function with proper unwind info.
    21  void
    22  x_cgo_callers(uintptr_t sig, void *info, void *context, void (*cgoTraceback)(struct cgoTracebackArg*), uintptr_t* cgoCallers, void (*sigtramp)(uintptr_t, void*, void*)) {
    23  	struct cgoTracebackArg arg;
    24  
    25  	arg.Context = 0;
    26  	arg.SigContext = (uintptr_t)(context);
    27  	arg.Buf = cgoCallers;
    28  	arg.Max = 32; // must match len(runtime.cgoCallers)
    29  	(*cgoTraceback)(&arg);
    30  	sigtramp(sig, info, context);
    31  }