maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
c4b94cff4badd26bdae83815850482ad9f2569e4
openairinterface5g/radio/rfsimulator/simulator.cpp
T

1196 lines
44 KiB
C++
Raw Blame History

/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Author and copyright: Laurent Thomas, open-cells.com
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*
* Open issues and limitations
* The read and write should be called in the same thread, that is not new USRP UHD design
* When the opposite side switch from passive reading to active R+Write, the synchro is not fully deterministic
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
#include <sys/epoll.h>
#include <netdb.h>
#include <common/utils/assertions.h>
#include <common/utils/LOG/log.h>
#include <common/utils/telnetsrv/telnetsrv.h>
#include <common/config/config_userapi.h>
#include "common_lib.h"
#define CHANNELMOD_DYNAMICLOAD
extern "C" {
#include <common/utils/load_module_shlib.h>
#include <openair1/SIMULATION/TOOLS/sim.h>
}
#include "rfsimulator.h"
#define PORT 4043 // default TCP port for this simulator
//
// CirSize defines the number of samples inquired for a read cycle
// It is bounded by a slot read capability (which depends on bandwidth and numerology)
// up to multiple slots read to allow I/Q buffering of the I/Q TCP stream
//
// As a rule of thumb:
// -it can't be less than the number of samples for a slot
// -it can range up to multiple slots
//
// The default value is chosen for 10ms buffering which makes 23040*20 = 460800 samples
// The previous value is kept below in comment it was computed for 100ms 1x 20MHz
// #define CirSize 6144000 // 100ms SiSo 20MHz LTE
#define minCirSize 460800 // 10ms SiSo 40Mhz 3/4 sampling NR78 FR1
#define sampleToByte(a, b) ((a) * (b) * sizeof(sample_t))
#define byteToSample(a, b) ((a) / (sizeof(sample_t) * (b)))
#define GENERATE_CHANNEL 10 // each frame (or slot?) in DL
#define MAX_FD_RFSIMU 250
#define SEND_BUFF_SIZE 100000000 // Socket buffer size
// Simulator role
typedef enum { SIMU_ROLE_SERVER = 1, SIMU_ROLE_CLIENT } simuRole;
//
#define RFSIMU_SECTION "rfsimulator"
#define RFSIMU_OPTIONS_PARAMNAME "options"
#define RFSIM_CONFIG_HELP_OPTIONS \
" list of comma separated options to enable rf simulator functionalities. Available options: \n" \
" chanmod: enable channel modelisation\n" \
" saviq: enable saving written iqs to a file\n"
// clang-format off
/*-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
/* configuration parameters for the rfsimulator device */
/* optname helpstr paramflags XXXptr defXXXval type numelt */
/*-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
#define simOpt PARAMFLAG_NOFREE | PARAMFLAG_CMDLINE_NOPREFIXENABLED
#define RFSIMULATOR_PARAMS_DESC { \
{"serveraddr", "<ip address to connect to>\n", simOpt, .strptr=&rfsimulator->ip, .defstrval="127.0.0.1", TYPE_STRING, 0 },\
{"serverport", "<port to connect to>\n", simOpt, .u16ptr = &(rfsimulator->port), .defuintval = PORT, TYPE_UINT16, 0}, \
{RFSIMU_OPTIONS_PARAMNAME, RFSIM_CONFIG_HELP_OPTIONS, 0, .strlistptr = NULL, .defstrlistval = NULL, TYPE_STRINGLIST, 0}, \
{"IQfile", "<file path to use when saving IQs>\n",simOpt, .strptr=&saveF, .defstrval="/tmp/rfsimulator.iqs",TYPE_STRING, 0 },\
{"modelname", "<channel model name>\n", simOpt, .strptr = &modelname, .defstrval = "AWGN", TYPE_STRING, 0}, \
{"ploss", "<channel path loss in dB>\n", simOpt, .dblptr = &(rfsimulator->chan_pathloss), .defdblval = 0, TYPE_DOUBLE, 0}, \
{"forgetfact", "<channel forget factor ((0 to 1)>\n", simOpt, .dblptr=&(rfsimulator->chan_forgetfact),.defdblval=0, TYPE_DOUBLE, 0 },\
{"offset", "<channel offset in samps>\n", simOpt, .u64ptr = &(rfsimulator->chan_offset), .defint64val = 0, TYPE_UINT64, 0}, \
{"prop_delay", "<propagation delay in ms>\n", simOpt, .dblptr=&(rfsimulator->prop_delay_ms), .defdblval=0.0, TYPE_DOUBLE, 0 },\
{"wait_timeout", "<wait timeout if no UE connected>\n", simOpt, .iptr=&(rfsimulator->wait_timeout), .defintval=1, TYPE_INT, 0 },\
};
// clang-format on
static void getset_currentchannels_type(char *buf, int debug, webdatadef_t *tdata, telnet_printfunc_t prnt);
extern int get_currentchannels_type(const char *buf, int debug, webdatadef_t *tdata, telnet_printfunc_t prnt); // in random_channel.c
static int rfsimu_setchanmod_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg);
static int rfsimu_setdistance_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg);
static int rfsimu_getdistance_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg);
static int rfsimu_vtime_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg);
// clang-format off
static telnetshell_cmddef_t rfsimu_cmdarray[] = {
{"show models", "", (cmdfunc_t)rfsimu_setchanmod_cmd, {(webfunc_t)getset_currentchannels_type}, TELNETSRV_CMDFLAG_WEBSRVONLY | TELNETSRV_CMDFLAG_GETWEBTBLDATA, NULL},
{"setmodel", "<model name> <model type>", (cmdfunc_t)rfsimu_setchanmod_cmd, {NULL}, TELNETSRV_CMDFLAG_PUSHINTPOOLQ | TELNETSRV_CMDFLAG_TELNETONLY, NULL},
{"setdistance", "<model name> <distance>", (cmdfunc_t)rfsimu_setdistance_cmd, {NULL}, TELNETSRV_CMDFLAG_PUSHINTPOOLQ | TELNETSRV_CMDFLAG_NEEDPARAM },
{"getdistance", "<model name>", (cmdfunc_t)rfsimu_getdistance_cmd, {NULL}, TELNETSRV_CMDFLAG_PUSHINTPOOLQ},
{"vtime", "", (cmdfunc_t)rfsimu_vtime_cmd, {NULL}, TELNETSRV_CMDFLAG_PUSHINTPOOLQ | TELNETSRV_CMDFLAG_AUTOUPDATE},
{"", "", NULL},
};
// clang-format on
static telnetshell_cmddef_t *setmodel_cmddef = &(rfsimu_cmdarray[1]);
static telnetshell_vardef_t rfsimu_vardef[] = {{"", 0, 0, NULL}};
static uint64_t CirSize = minCirSize;
typedef c16_t sample_t; // 2*16 bits complex number
typedef struct buffer_s {
int conn_sock;
openair0_timestamp lastReceivedTS;
bool headerMode;
bool trashingPacket;
samplesBlockHeader_t th;
char *transferPtr;
uint64_t remainToTransfer;
char *circularBufEnd;
sample_t *circularBuf;
channel_desc_t *channel_model;
} buffer_t;
typedef struct {
int listen_sock, epollfd;
pthread_mutex_t Sockmutex;
unsigned int nb_cnx;
openair0_timestamp nextRxTstamp;
openair0_timestamp lastWroteTS;
simuRole role;
char *ip;
uint16_t port;
int saveIQfile;
buffer_t buf[MAX_FD_RFSIMU];
int next_buf;
int rx_num_channels;
int tx_num_channels;
double sample_rate;
double rx_freq;
double tx_bw;
int channelmod;
double chan_pathloss;
double chan_forgetfact;
uint64_t chan_offset;
void *telnetcmd_qid;
poll_telnetcmdq_func_t poll_telnetcmdq;
int wait_timeout;
double prop_delay_ms;
} rfsimulator_state_t;
static bool flushInput(rfsimulator_state_t *t, int timeout, bool first_time);
static buffer_t *allocCirBuf(rfsimulator_state_t *bridge, int sock)
{
uint64_t buff_index = bridge->next_buf++ % MAX_FD_RFSIMU;
buffer_t *ptr = &bridge->buf[buff_index];
bridge->nb_cnx++;
ptr->circularBuf = static_cast<sample_t *>(calloc(1, sampleToByte(CirSize, 1)));
if (ptr->circularBuf == NULL) {
LOG_E(HW, "malloc(%lu) failed\n", sampleToByte(CirSize, 1));
return NULL;
}
ptr->circularBufEnd = ((char *)ptr->circularBuf) + sampleToByte(CirSize, 1);
ptr->conn_sock = sock;
ptr->lastReceivedTS = 0;
ptr->headerMode = true;
ptr->trashingPacket = true;
ptr->transferPtr = (char *)&ptr->th;
ptr->remainToTransfer = sizeof(samplesBlockHeader_t);
int sendbuff = SEND_BUFF_SIZE;
if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sendbuff, sizeof(sendbuff)) != 0) {
LOG_E(HW, "setsockopt(SO_SNDBUF) failed\n");
return NULL;
}
struct epoll_event ev = {0};
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.ptr = ptr;
if (epoll_ctl(bridge->epollfd, EPOLL_CTL_ADD, sock, &ev) != 0) {
LOG_E(HW, "epoll_ctl(EPOLL_CTL_ADD) failed\n");
return NULL;
}
if (bridge->channelmod > 0) {
// create channel simulation model for this mode reception
char modelname[30];
snprintf(modelname,
sizeofArray(modelname),
"rfsimu_channel_%s%d",
(bridge->role == SIMU_ROLE_SERVER) ? "ue" : "enB",
bridge->nb_cnx - 1);
ptr->channel_model = find_channel_desc_fromname(modelname); // path_loss in dB
if (!ptr->channel_model) {
// Use legacy method to find channel model - this will use the same channel model for all clients
const char *legacy_model_name = (bridge->role == SIMU_ROLE_SERVER) ? "rfsimu_channel_ue0" : "rfsimu_channel_enB0";
ptr->channel_model = find_channel_desc_fromname(legacy_model_name);
if (!ptr->channel_model) {
LOG_E(HW, "Channel model %s/%s not found, check config file\n", modelname, legacy_model_name);
return NULL;
}
}
set_channeldesc_owner(ptr->channel_model, RFSIMU_MODULEID);
set_channeldesc_direction(ptr->channel_model, bridge->role == SIMU_ROLE_SERVER);
random_channel(ptr->channel_model, false);
LOG_I(HW, "Random channel %s in rfsimulator activated\n", modelname);
}
return ptr;
}
static void removeCirBuf(rfsimulator_state_t *bridge, buffer_t *buf)
{
if (epoll_ctl(bridge->epollfd, EPOLL_CTL_DEL, buf->conn_sock, NULL) != 0) {
LOG_E(HW, "epoll_ctl(EPOLL_CTL_DEL) failed\n");
}
close(buf->conn_sock);
free(buf->circularBuf);
// Fixme: no free_channel_desc_scm(bridge->buf[sock].channel_model) implemented
// a lot of mem leaks
// free(bridge->buf[sock].channel_model);
memset(buf, 0, sizeof(buffer_t));
buf->conn_sock = -1;
bridge->nb_cnx--;
}
static void socketError(rfsimulator_state_t *bridge, buffer_t *buf)
{
if (buf->conn_sock != -1) {
LOG_W(HW, "Lost socket\n");
removeCirBuf(bridge, buf);
if (bridge->role == SIMU_ROLE_CLIENT)
exit(1);
}
}
enum blocking_t {
notBlocking,
blocking
};
static int setblocking(int sock, enum blocking_t active)
{
int opts = fcntl(sock, F_GETFL);
if (opts < 0) {
LOG_E(HW, "fcntl(F_GETFL) failed, errno(%d)\n", errno);
return -1;
}
if (active == blocking)
opts = opts & ~O_NONBLOCK;
else
opts = opts | O_NONBLOCK;
opts = fcntl(sock, F_SETFL, opts);
if (opts < 0) {
LOG_E(HW, "fcntl(F_SETFL) failed, errno(%d)\n", errno);
return -1;
}
return 0;
}
static void fullwrite(int fd, void *_buf, ssize_t count, rfsimulator_state_t *t) {
if (t->saveIQfile != -1) {
if (write(t->saveIQfile, _buf, count) != count)
LOG_E(HW, "write() in save iq file failed (%d)\n", errno);
}
char *buf = static_cast<char *>(_buf);
ssize_t l;
while (count) {
l = write(fd, buf, count);
if (l == 0) {
LOG_E(HW, "write() failed, returned 0\n");
return;
}
if (l < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN) {
LOG_D(HW, "write() failed, errno(%d)\n", errno);
usleep(250);
continue;
} else {
LOG_E(HW, "write() failed, errno(%d)\n", errno);
return;
}
}
count -= l;
buf += l;
}
}
static void rfsimulator_readconfig(rfsimulator_state_t *rfsimulator) {
char *saveF = NULL;
char *modelname = NULL;
paramdef_t rfsimu_params[] = RFSIMULATOR_PARAMS_DESC;
int p = config_paramidx_fromname(rfsimu_params, sizeofArray(rfsimu_params), RFSIMU_OPTIONS_PARAMNAME);
int ret = config_get(config_get_if(), rfsimu_params, sizeofArray(rfsimu_params), RFSIMU_SECTION);
AssertFatal(ret >= 0, "configuration couldn't be performed\n");
rfsimulator->saveIQfile = -1;
for (int i = 0; i < rfsimu_params[p].numelt; i++) {
if (strcmp(rfsimu_params[p].strlistptr[i], "saviq") == 0) {
rfsimulator->saveIQfile = open(saveF, O_APPEND | O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (rfsimulator->saveIQfile != -1)
LOG_I(HW, "Will save written IQ samples in %s\n", saveF);
else {
LOG_E(HW, "open(%s) failed for IQ saving, errno(%d)\n", saveF, errno);
exit(-1);
}
break;
} else if (strcmp(rfsimu_params[p].strlistptr[i], "chanmod") == 0) {
init_channelmod();
load_channellist(rfsimulator->tx_num_channels, rfsimulator->rx_num_channels, rfsimulator->sample_rate, rfsimulator->rx_freq, rfsimulator->tx_bw);
rfsimulator->channelmod = true;
} else {
fprintf(stderr, "unknown rfsimulator option: %s\n", rfsimu_params[p].strlistptr[i]);
exit(-1);
}
}
if ( strncasecmp(rfsimulator->ip,"enb",3) == 0 ||
strncasecmp(rfsimulator->ip,"server",3) == 0 )
rfsimulator->role = SIMU_ROLE_SERVER;
else
rfsimulator->role = SIMU_ROLE_CLIENT;
}
static int rfsimu_setchanmod_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg) {
char *modelname = NULL;
char *modeltype = NULL;
rfsimulator_state_t *t = (rfsimulator_state_t *)arg;
if (t->channelmod == false) {
prnt("%s: ERROR channel modelisation disabled...\n", __func__);
return 0;
}
if (buff == NULL) {
prnt("%s: ERROR wrong rfsimu setchannelmod command...\n", __func__);
return 0;
}
if (debug)
prnt("%s: rfsimu_setchanmod_cmd buffer \"%s\"\n", __func__, buff);
int s = sscanf(buff, "%m[^ ] %ms\n", &modelname, &modeltype);
if (s == 2) {
int channelmod = modelid_fromstrtype(modeltype);
if (channelmod < 0)
prnt("%s: ERROR: model type %s unknown\n", __func__, modeltype);
else {
rfsimulator_state_t *t = (rfsimulator_state_t *)arg;
int found = 0;
for (int i = 0; i < MAX_FD_RFSIMU; i++) {
buffer_t *b = &t->buf[i];
if (b->channel_model == NULL)
continue;
if (b->channel_model->model_name == NULL)
continue;
if (b->conn_sock >= 0 && (strcmp(b->channel_model->model_name, modelname) == 0)) {
channel_desc_t *newmodel = new_channel_desc_scm(t->tx_num_channels,
t->rx_num_channels,
static_cast<SCM_t>(channelmod),
t->sample_rate,
t->rx_freq,
t->tx_bw,
30e-9, // TDL delay-spread parameter
0.0,
CORR_LEVEL_LOW,
t->chan_forgetfact, // forgetting_factor
t->chan_offset, // propagation delay in samples
t->chan_pathloss,
0); // noise_power
set_channeldesc_owner(newmodel, RFSIMU_MODULEID);
set_channeldesc_direction(newmodel, t->role == SIMU_ROLE_SERVER);
set_channeldesc_name(newmodel, modelname);
random_channel(newmodel, false);
channel_desc_t *oldmodel = b->channel_model;
b->channel_model = newmodel;
free_channel_desc_scm(oldmodel);
prnt("%s: New model type %s applied to channel %s connected to sock %d\n", __func__, modeltype, modelname, i);
found = 1;
break;
}
} /* for */
if (found == 0)
prnt("%s: Channel %s not found or not currently used\n", __func__, modelname);
}
} else {
prnt("%s: ERROR: 2 parameters required: model name and model type (%i found)\n", __func__, s);
}
free(modelname);
free(modeltype);
return CMDSTATUS_FOUND;
}
static void getset_currentchannels_type(char *buf, int debug, webdatadef_t *tdata, telnet_printfunc_t prnt)
{
if (strncmp(buf, "set", 3) == 0) {
char cmd[256];
snprintf(cmd, sizeof(cmd), "setmodel %s %s", tdata->lines[0].val[1], tdata->lines[0].val[3]);
push_telnetcmd_func_t push_telnetcmd = (push_telnetcmd_func_t)get_shlibmodule_fptr("telnetsrv", TELNET_PUSHCMD_FNAME);
push_telnetcmd(setmodel_cmddef, cmd, prnt);
} else {
get_currentchannels_type("modify type", debug, tdata, prnt);
}
}
static int rfsimu_setdistance_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg)
{
if (debug)
prnt("%s() buffer \"%s\"\n", __func__, buff);
char *modelname;
int distance;
int s = sscanf(buff, "%m[^ ] %d\n", &modelname, &distance);
if (s != 2) {
prnt("%s: require exact two parameters\n", __func__);
return CMDSTATUS_VARNOTFOUND;
}
rfsimulator_state_t *t = (rfsimulator_state_t *)arg;
const double sample_rate = t->sample_rate;
const double c = 299792458; /* 3e8 */
const uint64_t new_offset = (double)distance * sample_rate / c;
const double new_distance = (double)new_offset * c / sample_rate;
const double new_delay_ms = new_offset * 1000.0 / sample_rate;
prnt("\n%s: new_offset %lu, new (exact) distance %.3f m, new delay %f ms\n", __func__, new_offset, new_distance, new_delay_ms);
t->prop_delay_ms = new_delay_ms;
t->chan_offset = new_offset;
/* Set distance in rfsim and channel model, update channel and ringbuffer */
for (int i = 0; i < MAX_FD_RFSIMU; i++) {
buffer_t *b = &t->buf[i];
if (b->conn_sock <= 0 || b->channel_model == NULL || b->channel_model->model_name == NULL || strcmp(b->channel_model->model_name, modelname) != 0) {
if (b->channel_model != NULL && b->channel_model->model_name != NULL)
prnt(" %s: model %s unmodified\n", __func__, b->channel_model->model_name);
continue;
}
channel_desc_t *cd = b->channel_model;
cd->channel_offset = new_offset;
}
free(modelname);
return CMDSTATUS_FOUND;
}
static int rfsimu_getdistance_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg)
{
if (debug)
prnt("%s() buffer \"%s\"\n", __func__, (buff != NULL) ? buff : "NULL");
rfsimulator_state_t *t = (rfsimulator_state_t *)arg;
const double sample_rate = t->sample_rate;
const double c = 299792458; /* 3e8 */
for (int i = 0; i < MAX_FD_RFSIMU; i++) {
buffer_t *b = &t->buf[i];
if (b->conn_sock <= 0 || b->channel_model == NULL || b->channel_model->model_name == NULL)
continue;
channel_desc_t *cd = b->channel_model;
const uint64_t offset = cd->channel_offset;
const double distance = (double)offset * c / sample_rate;
prnt("%s: %s offset %lu distance %.3f m\n", __func__, cd->model_name, offset, distance);
}
prnt("%s: <default> offset %lu delay %f ms\n", __func__, t->chan_offset, t->prop_delay_ms);
return CMDSTATUS_FOUND;
}
static int rfsimu_vtime_cmd(char *buff, int debug, telnet_printfunc_t prnt, void *arg)
{
rfsimulator_state_t *t = (rfsimulator_state_t *)arg;
const openair0_timestamp ts = t->nextRxTstamp;
const double sample_rate = t->sample_rate;
prnt("%s: vtime measurement: TS %llu sample_rate %.3f\n", __func__, ts, sample_rate);
return CMDSTATUS_FOUND;
}
static int startServer(openair0_device *device)
{
int sock = -1;
struct addrinfo *results = NULL;
struct addrinfo *rp = NULL;
rfsimulator_state_t *t = (rfsimulator_state_t *)device->priv;
t->role = SIMU_ROLE_SERVER;
char port[6];
snprintf(port, sizeof(port), "%d", t->port);
struct addrinfo hints = {
.ai_flags = AI_PASSIVE,
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
};
int s = getaddrinfo(NULL, port, &hints, &results);
if (s != 0) {
LOG_E(HW, "getaddrinfo: %s\n", gai_strerror(s));
freeaddrinfo(results);
return -1;
}
int enable = 1;
int disable = 0;
for (rp = results; rp != NULL; rp = rp->ai_next) {
sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sock == -1) {
continue;
}
if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &disable, sizeof(int)) != 0) {
continue;
}
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) != 0) {
continue;
}
if (bind(sock, rp->ai_addr, rp->ai_addrlen) == 0) {
break;
}
close(sock);
sock = -1;
}
freeaddrinfo(results);
if (sock <= 0) {
LOG_E(HW, "could not open a socket\n");
return -1;
}
t->listen_sock = sock;
if (listen(t->listen_sock, 5) != 0) {
LOG_E(HW, "listen() failed, errno(%d)\n", errno);
return -1;
}
struct epoll_event ev = {0};
ev.events = EPOLLIN;
ev.data.ptr = NULL;
if (epoll_ctl(t->epollfd, EPOLL_CTL_ADD, t->listen_sock, &ev) != 0) {
LOG_E(HW, "epoll_ctl(EPOLL_CTL_ADD) failed, errno(%d)\n", errno);
return -1;
}
return 0;
}
static int client_try_connect(const char *host, uint16_t port)
{
int sock = -1;
int s;
struct addrinfo *result = NULL;
struct addrinfo *rp = NULL;
char dport[6];
snprintf(dport, sizeof(dport), "%d", port);
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
};
s = getaddrinfo(host, dport, &hints, &result);
if (s != 0) {
LOG_E(HW, "getaddrinfo: %s\n", gai_strerror(s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sock == -1) {
continue;
}
if (connect(sock, rp->ai_addr, rp->ai_addrlen) != -1) {
break;
}
close(sock);
sock = -1;
}
freeaddrinfo(result);
return sock;
}
static int startClient(openair0_device *device)
{
rfsimulator_state_t *t = static_cast<rfsimulator_state_t *>(device->priv);
t->role = SIMU_ROLE_CLIENT;
int sock;
while (true) {
LOG_I(HW, "Trying to connect to %s:%d\n", t->ip, t->port);
sock = client_try_connect(t->ip, t->port);
if (sock > 0) {
LOG_I(HW, "Connection to %s:%d established\n", t->ip, t->port);
break;
}
LOG_I(HW, "connect() to %s:%d failed, errno(%d)\n", t->ip, t->port, errno);
sleep(1);
}
if (setblocking(sock, notBlocking) == -1) {
return -1;
}
buffer_t *b = allocCirBuf(t, sock);
if (!b)
return -1;
// read a 1 sample block to initialize the current time
bool have_to_wait;
do {
have_to_wait = true;
flushInput(t, 3, true);
if (b->lastReceivedTS)
have_to_wait = false;
} while (have_to_wait);
if (b->lastReceivedTS > 0)
b->lastReceivedTS--;
t->nextRxTstamp = b->lastReceivedTS;
LOG_D(HW, "Client got first timestamp: starting at %lu\n", t->nextRxTstamp);
if (b->channel_model)
b->channel_model->start_TS = t->nextRxTstamp;
return 0;
}
static int rfsimulator_write_internal(rfsimulator_state_t *t,
openair0_timestamp timestamp,
void ***samplesVoid,
int nsamps,
int nbAnt,
uint64_t beam_map,
int flags)
{
mutexlock(t->Sockmutex);
LOG_D(HW, "Sending %d samples at time: %ld, nbAnt %d\n", nsamps, timestamp, nbAnt);
for (int i = 0; i < MAX_FD_RFSIMU; i++) {
buffer_t *b = &t->buf[i];
if (b->conn_sock >= 0) {
if (!nbAnt)
LOG_E(HW, "rfsimulator sending 0 tx antennas\n");
samplesBlockHeader_t header = {(uint32_t)nsamps, (uint32_t)nbAnt, (uint64_t)timestamp, 0, 0, beam_map};
fullwrite(b->conn_sock, &header, sizeof(header), t);
if (nbAnt == 1) {
fullwrite(b->conn_sock, samplesVoid[0][0], sampleToByte(nsamps, nbAnt), t);
} else {
sample_t tmpSamples[nsamps][nbAnt];
for (int a = 0; a < nbAnt; a++) {
sample_t *in = (sample_t *)samplesVoid[0][a];
for (int s = 0; s < nsamps; s++)
tmpSamples[s][a] = in[s];
}
fullwrite(b->conn_sock, (void *)tmpSamples, sampleToByte(nsamps, nbAnt), t);
}
}
}
if (t->lastWroteTS != 0 && fabs((double)t->lastWroteTS - timestamp) > (double)CirSize)
LOG_W(HW, "Discontinuous TX gap too large Tx:%lu, %lu\n", t->lastWroteTS, timestamp);
if (t->lastWroteTS > timestamp)
LOG_W(HW, "Not supported to send Tx out of order %lu, %lu\n", t->lastWroteTS, timestamp);
if ((flags != TX_BURST_START) && (flags != TX_BURST_START_AND_END) && (t->lastWroteTS < timestamp))
LOG_W(HW,
"Gap in writing to USRP: last written %lu, now %lu, gap %lu\n",
t->lastWroteTS,
timestamp,
timestamp - t->lastWroteTS);
t->lastWroteTS = timestamp + nsamps;
mutexunlock(t->Sockmutex);
LOG_D(HW,
"Sent %d samples at time: %ld->%ld, energy in first antenna: %d\n",
nsamps,
timestamp,
timestamp + nsamps,
signal_energy(static_cast<int32_t *>(samplesVoid[0][0]), nsamps));
/* trace only first antenna */
T(T_USRP_TX_ANT0, T_INT(timestamp), T_BUFFER(samplesVoid[0], (int)sampleToByte(nsamps, 1)));
return nsamps;
}
static int rfsimulator_write_beams(openair0_device *device,
openair0_timestamp timestamp,
void ***samplesVoid,
int nsamps,
int nbAnt,
int num_beams,
int flags)
{
timestamp -= device->openair0_cfg->command_line_sample_advance;
rfsimulator_state_t *t = static_cast<rfsimulator_state_t *>(device->priv);
return rfsimulator_write_internal(t, timestamp, samplesVoid, nsamps, nbAnt, 1, flags);
}
static int rfsimulator_write(openair0_device *device, openair0_timestamp timestamp, void **buff, int nsamps, int cc, int flags)
{
void **tmp = buff;
return rfsimulator_write_beams(device, timestamp, &tmp, nsamps, cc, 1, flags);
}
static bool add_client(rfsimulator_state_t *t)
{
struct sockaddr_storage sa = {0};
socklen_t socklen = sizeof(sa);
int conn_sock = accept(t->listen_sock, (struct sockaddr *)&sa, &socklen);
if (conn_sock == -1) {
LOG_E(HW, "accept() failed, errno(%d)\n", errno);
return false;
}
if (setblocking(conn_sock, notBlocking)) {
return false;
}
mutexlock(t->Sockmutex);
buffer_t *new_buf = allocCirBuf(t, conn_sock);
if (new_buf == NULL) {
mutexunlock(t->Sockmutex);
return false;
}
new_buf->lastReceivedTS = t->lastWroteTS;
char ip[INET6_ADDRSTRLEN];
getnameinfo((struct sockaddr *)&sa, socklen, ip, sizeof(ip), NULL, 0, NI_NUMERICHOST);
uint16_t port = ((struct sockaddr_in *)&sa)->sin_port;
LOG_I(HW, "Client connects from %s:%d\n", ip, port);
c16_t v = {0};
void *samplesVoid[t->tx_num_channels];
for (int i = 0; i < t->tx_num_channels; i++)
samplesVoid[i] = (void *)&v;
samplesBlockHeader_t header = {1, (uint32_t)t->tx_num_channels, (uint64_t)t->lastWroteTS, 0, 0, 1};
fullwrite(conn_sock, &header, sizeof(header), t);
fullwrite(conn_sock, samplesVoid, sampleToByte(1, t->tx_num_channels), t);
if (new_buf->channel_model)
new_buf->channel_model->start_TS = t->lastWroteTS;
mutexunlock(t->Sockmutex);
return true;
}
static void process_recv_header(rfsimulator_state_t *t, buffer_t *b, bool first_time)
{
// check the header and start block transfer
if (b->remainToTransfer != 0)
return;
b->headerMode = false; // We got the header
if (first_time) {
b->lastReceivedTS = b->th.timestamp;
b->trashingPacket = true;
} else {
if (b->lastReceivedTS < (int64_t)b->th.timestamp) {
// We have a transmission hole to fill, like TDD
// we create no signal samples up to the beginning of this reception
int nbAnt = b->th.nbAnt;
if (!nbAnt)
LOG_E(HW, "rfsimulator receive 0 rx antennas\n");
if (b->th.timestamp - b->lastReceivedTS < CirSize) {
// case we wrap at circular buffer end
for (uint64_t index = b->lastReceivedTS; index < b->th.timestamp; index++) {
for (int a = 0; a < nbAnt; a++) {
b->circularBuf[(index * nbAnt + a) % CirSize] = (c16_t){0};
}
}
} else {
// case no circular buffer wrap
memset(b->circularBuf, 0, sampleToByte(CirSize, 1));
}
b->lastReceivedTS = b->th.timestamp;
} else if (b->lastReceivedTS > (int64_t)b->th.timestamp) {
LOG_W(HW, "Received data in past: current is %lu, new reception: %lu!\n", b->lastReceivedTS, b->th.timestamp);
b->trashingPacket = true;
}
// verify the time gap is not too large
mutexlock(t->Sockmutex);
if (t->lastWroteTS != 0 && (fabs((double)t->lastWroteTS - b->lastReceivedTS) > (double)CirSize))
LOG_W(HW, "UEsock(%d) Tx/Rx shift too large Tx:%lu, Rx:%lu\n", b->conn_sock, t->lastWroteTS, b->lastReceivedTS);
mutexunlock(t->Sockmutex);
}
// move back the pointer to overwrite the header, we don't need it anymore
b->transferPtr = (char *)&b->circularBuf[(b->lastReceivedTS * b->th.nbAnt) % CirSize];
// we now need to read the samples
b->remainToTransfer = sampleToByte(b->th.size, b->th.nbAnt);
if (!b->remainToTransfer)
b->headerMode = true; // We got a header with 0 antennas, no I/Q to read
return;
}
static void process_recv(rfsimulator_state_t *t, buffer_t *b, bool first_time)
{
if (b->transferPtr == b->circularBufEnd)
b->transferPtr = (char *)b->circularBuf;
if (!b->trashingPacket) {
b->lastReceivedTS = b->th.timestamp + b->th.size - byteToSample(b->remainToTransfer, b->th.nbAnt);
LOG_D(HW, "UEsock: %d Set b->lastReceivedTS %ld\n", b->conn_sock, b->lastReceivedTS);
}
if (b->remainToTransfer == 0) {
LOG_D(HW, "UEsock: %d Completed block reception: %ld\n", b->conn_sock, b->lastReceivedTS);
b->headerMode = true;
b->transferPtr = (char *)&b->th;
b->remainToTransfer = sizeof(samplesBlockHeader_t);
b->trashingPacket = false;
}
}
static bool flushInput(rfsimulator_state_t *t, int timeout, bool first_time)
{
// Process all incoming events on sockets
// store the data in lists
struct epoll_event events[MAX_FD_RFSIMU] = {{0}};
int nfds = epoll_wait(t->epollfd, events, MAX_FD_RFSIMU, timeout);
if (nfds == -1) {
if (!(errno == EINTR || errno == EAGAIN))
LOG_W(HW, "epoll_wait() failed, errno(%d)\n", errno);
return false;
}
for (int nbEv = 0; nbEv < nfds; ++nbEv) {
buffer_t *b = static_cast<buffer_t *>(events[nbEv].data.ptr);
if (events[nbEv].events & EPOLLIN && b == NULL) {
bool ret = add_client(t);
if (!ret)
return ret;
continue;
} else {
if (events[nbEv].events & (EPOLLHUP | EPOLLERR | EPOLLRDHUP)) {
socketError(t, b);
continue;
}
}
if (b->circularBuf == NULL) {
LOG_E(HW, "Received data on not connected socket %d\n", events[nbEv].data.fd);
continue;
}
ssize_t blockSz;
if (b->headerMode)
blockSz = b->remainToTransfer;
else
blockSz =
b->transferPtr + b->remainToTransfer <= b->circularBufEnd ? b->remainToTransfer : b->circularBufEnd - b->transferPtr;
ssize_t sz = recv(b->conn_sock, b->transferPtr, blockSz, MSG_DONTWAIT);
if (sz <= 0) {
if (sz < 0 && errno != EAGAIN)
LOG_E(HW, "recv() failed, errno(%d)\n", errno);
continue;
}
LOG_D(HW, "Socket rcv %zd bytes\n", sz);
b->remainToTransfer -= sz;
b->transferPtr += sz;
if (b->headerMode)
process_recv_header(t, b, first_time);
else
process_recv(t, b, first_time);
}
return nfds > 0;
}
static int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, void **samplesVoid, int nsamps, int nbAnt)
{
rfsimulator_state_t *t = static_cast<rfsimulator_state_t *>(device->priv);
LOG_D(HW,
"Enter rfsimulator_read, expect %d samples, will release at TS: %ld, nbAnt %d\n",
nsamps,
t->nextRxTstamp + nsamps,
nbAnt);
// deliver data from received data
// check if a UE is connected
int first_sock;
for (first_sock = 0; first_sock < MAX_FD_RFSIMU; first_sock++)
if (t->buf[first_sock].circularBuf != NULL)
break;
if (first_sock == MAX_FD_RFSIMU) {
// no connected device (we are eNB, no UE is connected)
if (t->nextRxTstamp == 0)
LOG_I(HW, "No connected device, generating void samples...\n");
if (!flushInput(t, t->wait_timeout, false)) {
for (int x = 0; x < nbAnt; x++)
memset(samplesVoid[x], 0, sampleToByte(nsamps, 1));
t->nextRxTstamp += nsamps;
if (((t->nextRxTstamp / nsamps) % 100) == 0)
LOG_D(HW, "No UE, Generating void samples for Rx: %ld\n", t->nextRxTstamp);
*ptimestamp = t->nextRxTstamp - nsamps;
return nsamps;
}
} else {
bool have_to_wait;
do {
have_to_wait = false;
buffer_t *b = NULL;
for (int sock = 0; sock < MAX_FD_RFSIMU; sock++) {
b = &t->buf[sock];
if (b->circularBuf && (t->nextRxTstamp + nsamps) > b->lastReceivedTS) {
have_to_wait = true;
break;
}
}
if (have_to_wait) {
LOG_D(HW,
"Waiting on socket, current last ts: %ld, expected at least : %ld\n",
b->lastReceivedTS,
t->nextRxTstamp + nsamps);
flushInput(t, 3, false);
}
} while (have_to_wait);
}
struct timespec start_time;
int ret = clock_gettime(CLOCK_REALTIME, &start_time);
AssertFatal(ret == 0, "clock_gettime() failed: errno %d, %s\n", errno, strerror(errno));
// Clear the output buffer
for (int a = 0; a < nbAnt; a++)
memset(samplesVoid[a], 0, sampleToByte(nsamps, 1));
cf_t temp_array[nbAnt][nsamps];
bool apply_noise_per_channel = get_noise_power_dBFS() == INVALID_DBFS_VALUE;
int num_chanmod_channels = 0;
// Add all input nodes signal in the output buffer
for (int sock = 0; sock < MAX_FD_RFSIMU; sock++) {
buffer_t *ptr = &t->buf[sock];
if (ptr->circularBuf && !ptr->trashingPacket) {
bool reGenerateChannel = false;
// fixme: when do we regenerate
// it seems legacy behavior is: never in UL, each frame in DL
if (reGenerateChannel)
random_channel(ptr->channel_model, 0);
if (t->poll_telnetcmdq)
t->poll_telnetcmdq(t->telnetcmd_qid, t);
for (int a_rx = 0; a_rx < nbAnt; a_rx++) { // loop over number of Rx antennas
if (ptr->channel_model != NULL) { // apply a channel model
if (num_chanmod_channels == 0) {
memset(temp_array, 0, sizeof(temp_array));
}
num_chanmod_channels++;
rxAddInput(ptr->circularBuf,
temp_array[a_rx],
a_rx,
ptr->channel_model,
nsamps,
t->nextRxTstamp,
CirSize,
apply_noise_per_channel);
} else { // no channel modeling
int nbAnt_tx = ptr->th.nbAnt; // number of Tx antennas
int firstIndex = (CirSize + t->nextRxTstamp - t->chan_offset) % CirSize;
sample_t *out = (sample_t *)samplesVoid[a_rx];
if (nbAnt_tx == 1 && t->nb_cnx == 1) { // optimized for 1 Tx and 1 UE
sample_t *firstSample = (sample_t *)&(ptr->circularBuf[firstIndex]);
if ((uint64_t)firstIndex + (uint64_t)nsamps > CirSize) {
int tailSz = CirSize - firstIndex;
memcpy(out, firstSample, sampleToByte(tailSz, 1));
memcpy(out + tailSz, &ptr->circularBuf[0], sampleToByte(nsamps - tailSz, 1));
} else {
memcpy(out, firstSample, sampleToByte(nsamps, 1));
}
} else {
// SIMD (with simde) optimization might be added here later
LOG_D(HW, "nbAnt_tx %d nbAnt %d\n", nbAnt_tx, nbAnt);
double H_awgn_mimo_coeff[nbAnt_tx];
for (int a_tx = 0; a_tx < nbAnt_tx; a_tx++) {
uint32_t ant_diff = abs(a_tx - a_rx);
H_awgn_mimo_coeff[a_tx] = ant_diff ? (0.2 / ant_diff) : 1.0;
}
for (int i = 0; i < nsamps; i++) { // loop over nsamps
for (int a_tx = 0; a_tx < nbAnt_tx; a_tx++) { // sum up signals from nbAnt_tx antennas
out[i].r += (short)(ptr->circularBuf[((firstIndex + i) * nbAnt_tx + a_tx) % CirSize].r * H_awgn_mimo_coeff[a_tx]);
out[i].i += (short)(ptr->circularBuf[((firstIndex + i) * nbAnt_tx + a_tx) % CirSize].i * H_awgn_mimo_coeff[a_tx]);
} // end for a_tx
} // end for i (number of samps)
} // end of 1 tx antenna optimization
} // end of no channel modeling
} // end for a (number of rx antennas)
}
}
if (apply_noise_per_channel && num_chanmod_channels > 0) {
// Noise is already applied through the channel model
for (int a = 0; a < nbAnt; a++) {
sample_t *out = (sample_t *)samplesVoid[a];
for (int i = 0; i < nsamps; i++) {
out[i].r += lroundf(temp_array[a][i].r);
out[i].i += lroundf(temp_array[a][i].i);
}
}
} else if (num_chanmod_channels > 0) {
// Apply noise from global setting
int16_t noise_power = (int16_t)(32767.0 / powf(10.0, .05 * -get_noise_power_dBFS()));
for (int a = 0; a < nbAnt; a++) {
sample_t *out = (sample_t *)samplesVoid[a];
for (int i = 0; i < nsamps; i++) {
out[i].r += lroundf(temp_array[a][i].r + noise_power * gaussZiggurat(0.0, 1.0));
out[i].i += lroundf(temp_array[a][i].i + noise_power * gaussZiggurat(0.0, 1.0));
}
}
}
struct timespec end_time;
ret = clock_gettime(CLOCK_REALTIME, &end_time);
AssertFatal(ret == 0, "clock_gettime() failed: errno %d, %s\n", errno, strerror(errno));
double diff_ns = (end_time.tv_sec - start_time.tv_sec) * 1000000000 + (end_time.tv_nsec - start_time.tv_nsec);
static double average = 0.0;
average = (average * 0.98) + (nsamps / (diff_ns / 1e9) * 0.02);
static int calls = 0;
if (calls++ % 10000 == 0) {
LOG_D(HW, "Rfsimulator: velocity %.2f Msps, realtime requirements %.2f Msps\n", average / 1e6, t->sample_rate / 1e6);
}
*ptimestamp = t->nextRxTstamp; // return the time of the first sample
t->nextRxTstamp += nsamps;
LOG_D(HW,
"Rx to upper layer: %d from %ld to %ld, energy in first antenna %d\n",
nsamps,
*ptimestamp,
t->nextRxTstamp,
signal_energy(static_cast<int32_t *>(samplesVoid[0]), nsamps));
/* trace only first antenna */
T(T_USRP_RX_ANT0, T_INT(t->nextRxTstamp), T_BUFFER(samplesVoid[0], (int)sampleToByte(nsamps, 1)));
return nsamps;
}
static int rfsimulator_get_stats(openair0_device *device) {
return 0;
}
static int rfsimulator_reset_stats(openair0_device *device) {
return 0;
}
static void rfsimulator_end(openair0_device *device) {
rfsimulator_state_t *s = static_cast<rfsimulator_state_t *>(device->priv);
for (int i = 0; i < MAX_FD_RFSIMU; i++) {
buffer_t *b = &s->buf[i];
if (b->conn_sock >= 0)
removeCirBuf(s, b);
}
close(s->epollfd);
free(s);
}
static void stopServer(openair0_device *device)
{
rfsimulator_state_t *t = (rfsimulator_state_t *)device->priv;
DevAssert(t != NULL);
close(t->listen_sock);
rfsimulator_end(device);
}
static int rfsimulator_stop(openair0_device *device) {
return 0;
}
static int rfsimulator_set_freq(openair0_device *device, openair0_config_t *openair0_cfg) {
rfsimulator_state_t *s = static_cast<rfsimulator_state_t *>(device->priv);
s->rx_freq = openair0_cfg->rx_freq[0];
return 0;
}
static int rfsimulator_set_gains(openair0_device *device, openair0_config_t *openair0_cfg) {
return 0;
}
static int rfsimulator_write_init(openair0_device *device) {
return 0;
}
extern "C" __attribute__((__visibility__("default")))
int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
// to change the log level, use this on command line
// --log_config.hw_log_level debug
rfsimulator_state_t *rfsimulator = static_cast<rfsimulator_state_t *>(calloc(sizeof(rfsimulator_state_t), 1));
// initialize channel simulation
rfsimulator->tx_num_channels = openair0_cfg->tx_num_channels;
rfsimulator->rx_num_channels = openair0_cfg->rx_num_channels;
rfsimulator->sample_rate = openair0_cfg->sample_rate;
rfsimulator->rx_freq = openair0_cfg->rx_freq[0];
rfsimulator->tx_bw = openair0_cfg->tx_bw;
rfsimulator_readconfig(rfsimulator);
if (rfsimulator->prop_delay_ms > 0.0)
rfsimulator->chan_offset = ceil(rfsimulator->sample_rate * rfsimulator->prop_delay_ms / 1000);
if (rfsimulator->chan_offset != 0) {
if (CirSize < minCirSize + rfsimulator->chan_offset) {
CirSize = minCirSize + rfsimulator->chan_offset;
LOG_I(HW, "CirSize = %lu\n", CirSize);
}
rfsimulator->prop_delay_ms = rfsimulator->chan_offset * 1000 / rfsimulator->sample_rate;
LOG_I(HW, "propagation delay %f ms, %lu samples\n", rfsimulator->prop_delay_ms, rfsimulator->chan_offset);
}
mutexinit(rfsimulator->Sockmutex);
LOG_I(HW,
"Running as %s\n",
rfsimulator->role == SIMU_ROLE_SERVER ? "server waiting opposite rfsimulators to connect"
: "client: will connect to a rfsimulator server side");
device->trx_start_func = rfsimulator->role == SIMU_ROLE_SERVER ? startServer : startClient;
device->trx_get_stats_func = rfsimulator_get_stats;
device->trx_reset_stats_func = rfsimulator_reset_stats;
device->trx_end_func = rfsimulator->role == SIMU_ROLE_SERVER ? stopServer : rfsimulator_end;
device->trx_stop_func = rfsimulator_stop;
device->trx_set_freq_func = rfsimulator_set_freq;
device->trx_set_gains_func = rfsimulator_set_gains;
device->trx_write_func = rfsimulator_write;
device->trx_write_beams_func = rfsimulator_write_beams;
device->trx_read_func = rfsimulator_read;
/* let's pretend to be a b2x0 */
device->type = RFSIMULATOR;
openair0_cfg[0].rx_gain[0] = 0;
device->openair0_cfg = &openair0_cfg[0];
device->priv = rfsimulator;
device->trx_write_init = rfsimulator_write_init;
for (int i = 0; i < MAX_FD_RFSIMU; i++)
rfsimulator->buf[i].conn_sock = -1;
rfsimulator->next_buf = 0;
AssertFatal((rfsimulator->epollfd = epoll_create1(0)) != -1, "epoll_create1() failed, errno(%d)", errno);
// we need to call randominit() for telnet server (use gaussdouble=>uniformrand)
randominit();
set_taus_seed(0);
/* look for telnet server, if it is loaded, add the channel modeling commands to it */
add_telnetcmd_func_t addcmd = (add_telnetcmd_func_t)get_shlibmodule_fptr("telnetsrv", TELNET_ADDCMD_FNAME);
if (addcmd != NULL) {
rfsimulator->poll_telnetcmdq = (poll_telnetcmdq_func_t)get_shlibmodule_fptr("telnetsrv", TELNET_POLLCMDQ_FNAME);
addcmd("rfsimu", rfsimu_vardef, rfsimu_cmdarray);
for (int i = 0; rfsimu_cmdarray[i].cmdfunc != NULL; i++) {
if (rfsimu_cmdarray[i].qptr != NULL) {
rfsimulator->telnetcmd_qid = rfsimu_cmdarray[i].qptr;
break;
}
}
}
/* write on a socket fails if the other end is closed and we get SIGPIPE */
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
perror("SIGPIPE");
exit(1);
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink