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node_dtrace.h
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SRC_NODE_DTRACE_H_
#define SRC_NODE_DTRACE_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "node_internals.h"
extern "C" {
/*
* The following structures are passed directly to DTrace when probes are fired.
* Translators in node.d translate these structures into the corresponding D
* structures, taking care of dealing with the user process data model (32-bit
* or 64-bit) and structure versions (see node_dtrace_http_server_request_t
* below).
*/
typedef struct {
int32_t fd;
int32_t port;
char* remote;
int32_t buffered;
} node_dtrace_connection_t;
typedef struct {
char* url;
char* method;
} node_dtrace_http_client_request_t;
/*
* The original version of this structure contained only a url and method, just
* like the client request above. To add the new forwardedFor field, the
* structure layout was changed to begin with an integer version. The
* translator knows whether it's looking at an old- or new-version structure
* based on whether the version field's value is a reasonable pointer (i.e.
* address greater than 4K). No doubt this is filthy, but there's not much else
* we can do, and it works reliably.
*
* This version of the structure also contains padding that should be zeroed out
* by the consumer so that future versions of the translator can simply check if
* a field is present by checking it against nullptr.
*/
typedef struct {
union {
uint32_t version;
uintptr_t unused; /* for compat. with old 64-bit struct */
} _un;
char* url;
char* method;
char* forwardedFor;
char* _pad[8];
} node_dtrace_http_server_request_t;
} // extern "C"
namespace node {
void InitDTrace(Environment* env, v8::Local<v8::Object> target);
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_NODE_DTRACE_H_