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freeswitch/libs/openzap/src/zap_ss7_boost.c

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/*
* Copyright (c) 2007, Anthony Minessale II
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of the original author; nor the names of any contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "openzap.h"
#include "ss7_boost_client.h"
#include "zap_ss7_boost.h"
typedef uint16_t ss7_boost_request_id_t;
typedef enum {
BST_FREE,
BST_WAITING,
BST_READY,
BST_FAIL
} ss7_boost_request_status_t;
typedef struct {
ss7_boost_request_status_t status;
ss7bc_event_t event;
zap_span_t *span;
zap_channel_t *zchan;
} ss7_boost_request_t;
static ss7_boost_request_id_t current_request = 0;
static ss7_boost_request_t OUTBOUND_REQUESTS[MAX_PENDING_CALLS] = {{ 0 }};
static zap_mutex_t *request_mutex = NULL;
static zap_mutex_t *signal_mutex = NULL;
static ss7_boost_request_id_t next_request_id(void)
{
ss7_boost_request_id_t r;
zap_mutex_lock(request_mutex);
if (current_request == MAX_PENDING_CALLS) {
current_request = 0;
}
r = current_request++;
zap_mutex_unlock(request_mutex);
return r + 1;
}
static zap_channel_t *find_zchan(zap_span_t *span, ss7bc_event_t *event)
{
int i;
zap_channel_t *zchan = NULL;
zap_mutex_lock(signal_mutex);
for(i = 0; i <= span->chan_count; i++) {
if (span->channels[i].physical_span_id == event->span+1 && span->channels[i].physical_chan_id == event->chan+1) {
zchan = &span->channels[i];
if (zap_test_flag(zchan, ZAP_CHANNEL_INUSE)) {
if (zchan->state == ZAP_CHANNEL_STATE_DOWN || zchan->state >= ZAP_CHANNEL_STATE_TERMINATING) {
int x = 0;
zap_log(ZAP_LOG_WARNING, "Channel %d:%d ~ %d:%d is already in use waiting for it to become available.\n");
zap_mutex_unlock(signal_mutex);
for (x = 0; x < 200; x++) {
if (!zap_test_flag(zchan, ZAP_CHANNEL_INUSE)) {
break;
}
zap_sleep(5);
}
zap_mutex_lock(signal_mutex);
}
if (zap_test_flag(zchan, ZAP_CHANNEL_INUSE)) {
zchan = NULL;
zap_log(ZAP_LOG_ERROR, "Channel %d:%d ~ %d:%d is already in use.\n",
span->channels[i].span_id,
span->channels[i].chan_id,
span->channels[i].physical_span_id,
span->channels[i].physical_chan_id
);
}
}
break;
}
}
zap_mutex_unlock(signal_mutex);
return zchan;
}
static ZIO_CHANNEL_REQUEST_FUNCTION(ss7_boost_channel_request)
{
zap_ss7_boost_data_t *ss7_boost_data = span->signal_data;
zap_status_t status = ZAP_FAIL;
ss7_boost_request_id_t r;
ss7bc_event_t event = {0};
int sanity = 60000;
if (zap_test_flag(span, ZAP_SPAN_SUSPENDED)) {
zap_log(ZAP_LOG_CRIT, "SPAN is not online.\n");
*zchan = NULL;
return ZAP_FAIL;
}
if (span->active_count >= span->chan_count) {
zap_log(ZAP_LOG_CRIT, "All circuits are busy.\n");
*zchan = NULL;
return ZAP_FAIL;
}
r = next_request_id();
ss7bc_call_init(&event, caller_data->cid_num.digits, caller_data->ani.digits, r);
zap_set_string(event.redirection_string, caller_data->rdnis.digits);
OUTBOUND_REQUESTS[r].status = BST_WAITING;
OUTBOUND_REQUESTS[r].span = span;
if (ss7bc_connection_write(&ss7_boost_data->mcon, &event) <= 0) {
zap_log(ZAP_LOG_CRIT, "Failed to tx on ISUP socket [%s]\n", strerror(errno));
status = ZAP_FAIL;
*zchan = NULL;
goto done;
}
while(zap_running() && OUTBOUND_REQUESTS[r].status == BST_WAITING) {
zap_sleep(1);
if (!--sanity) {
status = ZAP_FAIL;
*zchan = NULL;
goto done;
}
}
if (OUTBOUND_REQUESTS[r].status == BST_READY && OUTBOUND_REQUESTS[r].zchan) {
*zchan = OUTBOUND_REQUESTS[r].zchan;
status = ZAP_SUCCESS;
} else {
status = ZAP_FAIL;
*zchan = NULL;
}
done:
OUTBOUND_REQUESTS[r].status = BST_FREE;
return status;
}
static ZIO_CHANNEL_OUTGOING_CALL_FUNCTION(ss7_boost_outgoing_call)
{
zap_status_t status = ZAP_SUCCESS;
return status;
}
static void handle_call_start_ack(ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
zap_channel_t *zchan;
OUTBOUND_REQUESTS[event->call_setup_id].event = *event;
if ((zchan = find_zchan(OUTBOUND_REQUESTS[event->call_setup_id].span, event))) {
OUTBOUND_REQUESTS[event->call_setup_id].status = BST_READY;
if (zap_channel_open_chan(zchan) != ZAP_SUCCESS) {
zap_log(ZAP_LOG_ERROR, "OPEN ERROR [%s]\n", zchan->last_error);
} else {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_PROGRESS_MEDIA);
zap_set_flag(zchan, ZAP_CHANNEL_OUTBOUND);
OUTBOUND_REQUESTS[event->call_setup_id].zchan = zchan;
return;
}
}
zap_log(ZAP_LOG_CRIT, "START ACK CANT FIND A CHAN %d:%d\n", event->span+1,event->chan+1);
ss7bc_exec_command(mcon,
event->span,
event->chan,
event->call_setup_id,
SIGBOOST_EVENT_CALL_STOPPED,
ZAP_CAUSE_DESTINATION_OUT_OF_ORDER);
OUTBOUND_REQUESTS[event->call_setup_id].status = BST_FAIL;
}
static void handle_call_start_nack(ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
OUTBOUND_REQUESTS[event->call_setup_id].event = *event;
OUTBOUND_REQUESTS[event->call_setup_id].status = BST_FAIL;
ss7bc_exec_command(mcon,
event->span,
event->chan,
event->call_setup_id,
SIGBOOST_EVENT_CALL_START_NACK_ACK,
0);
}
static void handle_call_stop(zap_span_t *span, ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
zap_channel_t *zchan;
if ((zchan = find_zchan(span, event))) {
zchan->caller_data.hangup_cause = event->release_cause;
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_TERMINATING);
} else {
zap_log(ZAP_LOG_CRIT, "STOP CANT FIND A CHAN %d:%d\n", event->span+1,event->chan+1);
}
ss7bc_exec_command(mcon,
event->span,
event->chan,
0,
SIGBOOST_EVENT_CALL_STOPPED_ACK,
0);
}
static void handle_call_answer(zap_span_t *span, ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
zap_channel_t *zchan;
if ((zchan = find_zchan(span, event))) {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_UP);
} else {
zap_log(ZAP_LOG_CRIT, "ANSWER CANT FIND A CHAN %d:%d\n", event->span+1,event->chan+1);
}
}
static void handle_call_start(zap_span_t *span, ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
zap_channel_t *zchan;
if (!(zchan = find_zchan(span, event))) {
goto error;
}
if (zap_channel_open_chan(zchan) != ZAP_SUCCESS) {
goto error;
}
zap_set_string(zchan->caller_data.cid_num.digits, (char *)event->calling_number_digits);
zap_set_string(zchan->caller_data.cid_name, (char *)event->calling_number_digits);
zap_set_string(zchan->caller_data.ani.digits, (char *)event->calling_number_digits);
zap_set_string(zchan->caller_data.dnis.digits, (char *)event->called_number_digits);
zap_set_string(zchan->caller_data.rdnis.digits, (char *)event->redirection_string);
zchan->caller_data.screen = event->calling_number_screening_ind;
zchan->caller_data.pres = event->calling_number_presentation;
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_RING);
return;
error:
zap_log(ZAP_LOG_CRIT, "START CANT FIND A CHAN %d:%d\n", event->span+1,event->chan+1);
ss7bc_exec_command(mcon,
event->span,
event->chan,
0,
SIGBOOST_EVENT_CALL_START_NACK,
0);
}
static void handle_heartbeat(ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
int err;
err = ss7bc_connection_write(mcon, event);
if (err <= 0) {
zap_log(ZAP_LOG_CRIT, "Failed to tx on ISUP socket [%s]: %s\n", strerror(errno));
}
mcon->hb_elapsed = 0;
return;
}
static void handle_restart_ack(ss7bc_connection_t *mcon, zap_span_t *span, ss7bc_event_t *event)
{
mcon->rxseq_reset = 0;
mcon->up = 1;
zap_set_state_all(span, ZAP_CHANNEL_STATE_RESTART);
zap_clear_flag_locked(span, ZAP_SPAN_SUSPENDED);
mcon->hb_elapsed = 0;
}
static int parse_ss7_event(zap_span_t *span, ss7bc_connection_t *mcon, ss7bc_event_t *event)
{
zap_mutex_lock(signal_mutex);
if (zap_test_flag(span, ZAP_SPAN_SUSPENDED) &&
event->event_id != SIGBOOST_EVENT_SYSTEM_RESTART_ACK && event->event_id != SIGBOOST_EVENT_HEARTBEAT) {
zap_log(ZAP_LOG_WARNING,
"INVALID EVENT: %s:(%X) [w%dg%d] Rc=%i CSid=%i Seq=%i Cd=[%s] Ci=[%s]\n",
ss7bc_event_id_name(event->event_id),
event->event_id,
event->span+1,
event->chan+1,
event->release_cause,
event->call_setup_id,
event->fseqno,
(event->called_number_digits_count ? (char *) event->called_number_digits : "N/A"),
(event->calling_number_digits_count ? (char *) event->calling_number_digits : "N/A")
);
goto end;
}
zap_log(ZAP_LOG_DEBUG,
"RX EVENT: %s:(%X) [w%dg%d] Rc=%i CSid=%i Seq=%i Cd=[%s] Ci=[%s]\n",
ss7bc_event_id_name(event->event_id),
event->event_id,
event->span+1,
event->chan+1,
event->release_cause,
event->call_setup_id,
event->fseqno,
(event->called_number_digits_count ? (char *) event->called_number_digits : "N/A"),
(event->calling_number_digits_count ? (char *) event->calling_number_digits : "N/A")
);
switch(event->event_id) {
case SIGBOOST_EVENT_CALL_START:
handle_call_start(span, mcon, event);
break;
case SIGBOOST_EVENT_CALL_STOPPED:
handle_call_stop(span, mcon, event);
break;
case SIGBOOST_EVENT_CALL_START_ACK:
handle_call_start_ack(mcon, event);
break;
case SIGBOOST_EVENT_CALL_START_NACK:
handle_call_start_nack(mcon, event);
break;
case SIGBOOST_EVENT_CALL_ANSWERED:
handle_call_answer(span, mcon, event);
break;
case SIGBOOST_EVENT_HEARTBEAT:
handle_heartbeat(mcon, event);
break;
case SIGBOOST_EVENT_CALL_START_NACK_ACK:
//handle_call_start_nack_ack(event);
break;
case SIGBOOST_EVENT_CALL_STOPPED_ACK:
//handle_call_stop_ack(event);
break;
case SIGBOOST_EVENT_INSERT_CHECK_LOOP:
//handle_call_loop_start(event);
break;
case SIGBOOST_EVENT_REMOVE_CHECK_LOOP:
//handle_call_stop(event);
break;
case SIGBOOST_EVENT_SYSTEM_RESTART_ACK:
handle_restart_ack(mcon, span, event);
break;
case SIGBOOST_EVENT_AUTO_CALL_GAP_ABATE:
//handle_gap_abate(event);
break;
default:
zap_log(ZAP_LOG_WARNING, "No handler implemented for [%s]\n", ss7bc_event_id_name(event->event_id));
break;
}
end:
zap_mutex_unlock(signal_mutex);
return 0;
}
static __inline__ void state_advance(zap_channel_t *zchan)
{
zap_ss7_boost_data_t *ss7_boost_data = zchan->span->signal_data;
ss7bc_connection_t *mcon = &ss7_boost_data->mcon;
zap_sigmsg_t sig;
zap_status_t status;
zap_log(ZAP_LOG_DEBUG, "%d:%d STATE [%s]\n", zchan->span_id, zchan->chan_id, zap_channel_state2str(zchan->state));
memset(&sig, 0, sizeof(sig));
sig.chan_id = zchan->chan_id;
sig.span_id = zchan->span_id;
sig.channel = zchan;
switch (zchan->state) {
case ZAP_CHANNEL_STATE_DOWN:
{
zap_channel_done(zchan);
}
break;
case ZAP_CHANNEL_STATE_PROGRESS_MEDIA:
case ZAP_CHANNEL_STATE_PROGRESS:
{
if (zap_test_flag(zchan, ZAP_CHANNEL_OUTBOUND)) {
sig.event_id = ZAP_SIGEVENT_PROGRESS_MEDIA;
if ((status = ss7_boost_data->signal_cb(&sig) != ZAP_SUCCESS)) {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_HANGUP);
}
} else {
}
}
break;
case ZAP_CHANNEL_STATE_RING:
{
if (!zap_test_flag(zchan, ZAP_CHANNEL_OUTBOUND)) {
sig.event_id = ZAP_SIGEVENT_START;
if ((status = ss7_boost_data->signal_cb(&sig) != ZAP_SUCCESS)) {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_HANGUP);
}
}
}
break;
case ZAP_CHANNEL_STATE_RESTART:
{
if (zchan->last_state > ZAP_CHANNEL_STATE_HANGUP) {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_HANGUP);
} else {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
}
}
break;
case ZAP_CHANNEL_STATE_UP:
{
if (zap_test_flag(zchan, ZAP_CHANNEL_OUTBOUND)) {
sig.event_id = ZAP_SIGEVENT_UP;
if ((status = ss7_boost_data->signal_cb(&sig) != ZAP_SUCCESS)) {
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_HANGUP);
}
} else {
ss7bc_exec_command(mcon,
zchan->physical_span_id-1,
zchan->physical_chan_id-1,
0,
SIGBOOST_EVENT_CALL_START_ACK,
0);
ss7bc_exec_command(mcon,
zchan->physical_span_id-1,
zchan->physical_chan_id-1,
0,
SIGBOOST_EVENT_CALL_ANSWERED,
0);
}
}
break;
case ZAP_CHANNEL_STATE_DIALING:
{
}
break;
case ZAP_CHANNEL_STATE_HANGUP:
{
if (zap_test_flag(zchan, ZAP_CHANNEL_ANSWERED)) {
ss7bc_exec_command(mcon,
zchan->physical_span_id-1,
zchan->physical_chan_id-1,
0,
SIGBOOST_EVENT_CALL_STOPPED,
zchan->caller_data.hangup_cause);
} else {
ss7bc_exec_command(mcon,
zchan->physical_span_id-1,
zchan->physical_chan_id-1,
0,
SIGBOOST_EVENT_CALL_START_NACK,
zchan->caller_data.hangup_cause);
}
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
}
break;
case ZAP_CHANNEL_STATE_TERMINATING:
{
sig.event_id = ZAP_SIGEVENT_STOP;
status = ss7_boost_data->signal_cb(&sig);
zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
}
default:
break;
}
}
static __inline__ void init_outgoing_array(void)
{
memset(&OUTBOUND_REQUESTS, 0, sizeof(OUTBOUND_REQUESTS));
}
static __inline__ void check_state(zap_span_t *span)
{
if (zap_test_flag(span, ZAP_SPAN_STATE_CHANGE)) {
uint32_t j;
for(j = 1; j <= span->chan_count; j++) {
if (zap_test_flag((&span->channels[j]), ZAP_CHANNEL_STATE_CHANGE)) {
zap_mutex_lock(signal_mutex);
state_advance(&span->channels[j]);
zap_mutex_unlock(signal_mutex);
zap_clear_flag_locked((&span->channels[j]), ZAP_CHANNEL_STATE_CHANGE);
}
}
zap_clear_flag_locked(span, ZAP_SPAN_STATE_CHANGE);
}
}
static void *zap_ss7_boost_run(zap_thread_t *me, void *obj)
{
zap_span_t *span = (zap_span_t *) obj;
zap_ss7_boost_data_t *ss7_boost_data = span->signal_data;
ss7bc_connection_t *mcon, *pcon;
uint32_t ms = 10, too_long = 60000;
ss7_boost_data->pcon = ss7_boost_data->mcon;
if (ss7bc_connection_open(&ss7_boost_data->mcon,
ss7_boost_data->mcon.cfg.local_ip,
ss7_boost_data->mcon.cfg.local_port,
ss7_boost_data->mcon.cfg.remote_ip,
ss7_boost_data->mcon.cfg.remote_port) < 0) {
zap_log(ZAP_LOG_DEBUG, "Error: Opening MCON Socket [%d] %s\n", ss7_boost_data->mcon.socket, strerror(errno));
goto end;
}
if (ss7bc_connection_open(&ss7_boost_data->pcon,
ss7_boost_data->pcon.cfg.local_ip,
++ss7_boost_data->pcon.cfg.local_port,
ss7_boost_data->pcon.cfg.remote_ip,
ss7_boost_data->pcon.cfg.remote_port) < 0) {
zap_log(ZAP_LOG_DEBUG, "Error: Opening PCON Socket [%d] %s\n", ss7_boost_data->pcon.socket, strerror(errno));
goto end;
}
mcon = &ss7_boost_data->mcon;
pcon = &ss7_boost_data->pcon;
top:
init_outgoing_array();
ss7bc_exec_command(mcon,
0,
0,
-1,
SIGBOOST_EVENT_SYSTEM_RESTART,
0);
while (zap_running() && zap_test_flag(ss7_boost_data, ZAP_SS7_BOOST_RUNNING)) {
fd_set rfds, efds;
struct timeval tv = { 0, ms * 1000 };
int max, activity, i = 0;
ss7bc_event_t *event = NULL;
FD_ZERO(&rfds);
FD_ZERO(&efds);
FD_SET(mcon->socket, &rfds);
FD_SET(mcon->socket, &efds);
FD_SET(pcon->socket, &rfds);
FD_SET(pcon->socket, &efds);
max = ((pcon->socket > mcon->socket) ? pcon->socket : mcon->socket) + 1;
if ((activity = select(max, &rfds, NULL, &efds, &tv)) < 0) {
goto error;
}
if (activity) {
if (FD_ISSET(pcon->socket, &efds) || FD_ISSET(mcon->socket, &efds)) {
goto error;
}
if (FD_ISSET(pcon->socket, &rfds)) {
if ((event = ss7bc_connection_readp(pcon, i))) {
parse_ss7_event(span, mcon, event);
} else goto top;
}
if (FD_ISSET(mcon->socket, &rfds)) {
if ((event = ss7bc_connection_read(mcon, i))) {
parse_ss7_event(span, mcon, event);
} else goto top;
}
}
check_state(span);
mcon->hb_elapsed += ms;
if (mcon->hb_elapsed >= too_long && (mcon->up || !zap_test_flag(span, ZAP_SPAN_SUSPENDED))) {
zap_set_state_all(span, ZAP_CHANNEL_STATE_RESTART);
zap_set_flag_locked(span, ZAP_SPAN_SUSPENDED);
mcon->up = 0;
zap_log(ZAP_LOG_CRIT, "Lost Heartbeat!\n");
}
}
goto end;
error:
zap_log(ZAP_LOG_CRIT, "Socket Error!\n");
end:
ss7bc_connection_close(&ss7_boost_data->mcon);
ss7bc_connection_close(&ss7_boost_data->pcon);
zap_clear_flag(ss7_boost_data, ZAP_SS7_BOOST_RUNNING);
zap_log(ZAP_LOG_DEBUG, "SS7_BOOST thread ended.\n");
return NULL;
}
zap_status_t zap_ss7_boost_init(void)
{
zap_mutex_create(&request_mutex);
zap_mutex_create(&signal_mutex);
return ZAP_SUCCESS;
}
zap_status_t zap_ss7_boost_start(zap_span_t *span)
{
zap_ss7_boost_data_t *ss7_boost_data = span->signal_data;
zap_set_flag(ss7_boost_data, ZAP_SS7_BOOST_RUNNING);
return zap_thread_create_detached(zap_ss7_boost_run, span);
}
zap_status_t zap_ss7_boost_configure_span(zap_span_t *span,
const char *local_ip, int local_port,
const char *remote_ip, int remote_port,
zio_signal_cb_t sig_cb)
{
zap_ss7_boost_data_t *ss7_boost_data = NULL;
if (!local_ip && local_port && remote_ip && remote_port && sig_cb) {
return ZAP_FAIL;
}
ss7_boost_data = malloc(sizeof(*ss7_boost_data));
assert(ss7_boost_data);
memset(ss7_boost_data, 0, sizeof(*ss7_boost_data));
zap_set_string(ss7_boost_data->mcon.cfg.local_ip, local_ip);
ss7_boost_data->mcon.cfg.local_port = local_port;
zap_set_string(ss7_boost_data->mcon.cfg.remote_ip, remote_ip);
ss7_boost_data->mcon.cfg.remote_port = remote_port;
ss7_boost_data->signal_cb = sig_cb;
span->signal_data = ss7_boost_data;
span->signal_type = ZAP_SIGTYPE_SS7BOOST;
span->outgoing_call = ss7_boost_outgoing_call;
span->channel_request = ss7_boost_channel_request;
zap_set_flag_locked(span, ZAP_SPAN_SUSPENDED);
return ZAP_SUCCESS;
}
/* For Emacs:
* Local Variables:
* mode:c
* indent-tabs-mode:t
* tab-width:4
* c-basic-offset:4
* End:
* For VIM:
* vim:set softtabstop=4 shiftwidth=4 tabstop=4 expandtab:
*/
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