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/*
* %CopyrightBegin%
*
* Copyright Scott Lystig Fritchie 2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Dynamically loadable NIF library for DTrace
*/
#include "erl_nif.h"
#include "config.h"
#include "sys.h"
#include "dtrace-wrapper.h"
#if defined(USE_DYNAMIC_TRACE) && (defined(USE_DTRACE) || defined(USE_SYSTEMTAP))
#define HAVE_USE_DTRACE 1
#endif
#ifdef HAVE_USE_DTRACE
#include "dtrace_user.h"
#endif
void dtrace_nifenv_str(ErlNifEnv *env, char *process_buf);
void get_string_maybe(ErlNifEnv *env, const ERL_NIF_TERM term, char **ptr, char *buf, int bufsiz);
#ifdef VALGRIND
# include <valgrind/memcheck.h>
#endif
#ifdef __GNUC__
# define INLINE __inline__
#else
# define INLINE
#endif
#define MESSAGE_BUFSIZ 1024
/* NIF interface declarations */
static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info);
/* The NIFs: */
static ERL_NIF_TERM available(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM user_trace_s1(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM user_trace_i4s4(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ErlNifFunc nif_funcs[] = {
{"available", 0, available},
{"user_trace_s1", 1, user_trace_s1},
{"user_trace_i4s4", 9, user_trace_i4s4}
};
ERL_NIF_INIT(dyntrace, nif_funcs, load, NULL, NULL, NULL)
static ERL_NIF_TERM atom_true;
static ERL_NIF_TERM atom_false;
static ERL_NIF_TERM atom_error;
static ERL_NIF_TERM atom_not_available;
static ERL_NIF_TERM atom_badarg;
static ERL_NIF_TERM atom_ok;
static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
atom_true = enif_make_atom(env,"true");
atom_false = enif_make_atom(env,"false");
atom_error = enif_make_atom(env,"error");
atom_not_available = enif_make_atom(env,"not_available");
atom_badarg = enif_make_atom(env,"badarg");
atom_ok = enif_make_atom(env,"ok");
return 0;
}
static ERL_NIF_TERM available(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
return atom_true;
#else
return atom_false;
#endif
}
static ERL_NIF_TERM user_trace_s1(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
ErlNifBinary message_bin;
DTRACE_CHARBUF(messagebuf, MESSAGE_BUFSIZ + 1);
if (DTRACE_ENABLED(user_trace_s1)) {
if (!enif_inspect_iolist_as_binary(env, argv[0], &message_bin) ||
message_bin.size > MESSAGE_BUFSIZ) {
return atom_badarg;
}
memcpy(messagebuf, (char *) message_bin.data, message_bin.size);
messagebuf[message_bin.size] = '\0';
DTRACE1(user_trace_s1, messagebuf);
return atom_true;
} else {
return atom_false;
}
#else
return atom_error;
#endif
}
void
get_string_maybe(ErlNifEnv *env,
const ERL_NIF_TERM term, char **ptr, char *buf, int bufsiz)
{
ErlNifBinary str_bin;
if (!enif_inspect_iolist_as_binary(env, term, &str_bin) ||
str_bin.size > bufsiz) {
*ptr = NULL;
} else {
memcpy(buf, (char *) str_bin.data, str_bin.size);
buf[str_bin.size] = '\0';
*ptr = buf;
}
}
static ERL_NIF_TERM user_trace_i4s4(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
DTRACE_CHARBUF(procbuf, 32 + 1);
DTRACE_CHARBUF(user_tagbuf, MESSAGE_BUFSIZ + 1);
char *utbuf = NULL;
ErlNifSInt64 i1, i2, i3, i4;
DTRACE_CHARBUF(messagebuf1, MESSAGE_BUFSIZ + 1);
DTRACE_CHARBUF(messagebuf2, MESSAGE_BUFSIZ + 1);
DTRACE_CHARBUF(messagebuf3, MESSAGE_BUFSIZ + 1);
DTRACE_CHARBUF(messagebuf4, MESSAGE_BUFSIZ + 1);
char *mbuf1 = NULL, *mbuf2 = NULL, *mbuf3 = NULL, *mbuf4 = NULL;
if (DTRACE_ENABLED(user_trace_i4s4)) {
dtrace_nifenv_str(env, procbuf);
get_string_maybe(env, argv[0], &utbuf, user_tagbuf, MESSAGE_BUFSIZ);
if (! enif_get_int64(env, argv[1], &i1))
i1 = 0;
if (! enif_get_int64(env, argv[2], &i2))
i2 = 0;
if (! enif_get_int64(env, argv[3], &i3))
i3 = 0;
if (! enif_get_int64(env, argv[4], &i4))
i4 = 0;
get_string_maybe(env, argv[5], &mbuf1, messagebuf1, MESSAGE_BUFSIZ);
get_string_maybe(env, argv[6], &mbuf2, messagebuf2, MESSAGE_BUFSIZ);
get_string_maybe(env, argv[7], &mbuf3, messagebuf3, MESSAGE_BUFSIZ);
get_string_maybe(env, argv[8], &mbuf4, messagebuf4, MESSAGE_BUFSIZ);
DTRACE10(user_trace_i4s4, procbuf, utbuf,
i1, i2, i3, i4, mbuf1, mbuf2, mbuf3, mbuf4);
return atom_true;
} else {
return atom_false;
}
#else
return atom_error;
#endif
}
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