node/src/node_dtrace.h at master · magicmonkey/node · GitHub

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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 NODE_DTRACE_H_

#define NODE_DTRACE_H_

#include "node.h"

#include "v8.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 NULL.

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;

}

namespace node {

void InitDTrace(v8::Handle<v8::Object> target);

}

#endif

node/src/node_dtrace.h at master · magicmonkey/node · GitHub

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