/*-
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* BSD 2-Clause License
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*
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* Copyright (c) 2012-2018, Jan Breuer
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file main.c
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* @date Thu Nov 15 10:58:45 UTC 2012
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*
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* @brief TCP/IP SCPI Server
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*
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include "scpi/scpi.h"
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#include "../common/scpi-def.h"
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#define CONTROL_PORT 5026
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typedef struct {
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int io;
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int io_listen;
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int control_io;
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int control_io_listen;
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FILE * fio;
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fd_set fds;
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} user_data_t;
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size_t SCPI_Write(scpi_t * context, const char * data, size_t len) {
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if (context->user_context != NULL) {
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user_data_t * u = (user_data_t *) (context->user_context);
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if (u->fio) {
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return fwrite(data, 1, len, u->fio);
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}
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}
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return 0;
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}
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scpi_result_t SCPI_Flush(scpi_t * context) {
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if (context->user_context != NULL) {
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user_data_t * u = (user_data_t *) (context->user_context);
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if (u->fio) {
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return fflush(u->fio) == 0 ? SCPI_RES_OK : SCPI_RES_ERR;
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}
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}
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return SCPI_RES_OK;
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}
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int SCPI_Error(scpi_t * context, int_fast16_t err) {
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(void) context;
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/* BEEP */
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fprintf(stderr, "**ERROR: %d, \"%s\"\r\n", (int16_t) err, SCPI_ErrorTranslate(err));
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return 0;
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}
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scpi_result_t SCPI_Control(scpi_t * context, scpi_ctrl_name_t ctrl, scpi_reg_val_t val) {
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char b[16];
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if (SCPI_CTRL_SRQ == ctrl) {
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fprintf(stderr, "**SRQ: 0x%X (%d)\r\n", val, val);
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} else {
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fprintf(stderr, "**CTRL %02x: 0x%X (%d)\r\n", ctrl, val, val);
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}
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if (context->user_context != NULL) {
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user_data_t * u = (user_data_t *) (context->user_context);
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if (u->control_io >= 0) {
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sprintf(b, "SRQ%d\r\n", val);
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return write(u->control_io, b, strlen(b)) > 0 ? SCPI_RES_OK : SCPI_RES_ERR;
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}
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}
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return SCPI_RES_OK;
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}
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scpi_result_t SCPI_Reset(scpi_t * context) {
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(void) context;
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fprintf(stderr, "**Reset\r\n");
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return SCPI_RES_OK;
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}
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scpi_result_t SCPI_SystemCommTcpipControlQ(scpi_t * context) {
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SCPI_ResultInt32(context, CONTROL_PORT);
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return SCPI_RES_OK;
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}
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static int createServer(int port) {
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int fd;
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int rc;
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int on = 1;
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struct sockaddr_in servaddr;
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/* Configure TCP Server */
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memset(&servaddr, 0, sizeof (servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servaddr.sin_port = htons(port);
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/* Create socket */
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
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perror("socket() failed");
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exit(-1);
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}
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/* Set address reuse enable */
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rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof (on));
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if (rc < 0) {
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perror("setsockopt() failed");
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close(fd);
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exit(-1);
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}
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/* Set non blocking */
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rc = ioctl(fd, FIONBIO, (char *) &on);
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if (rc < 0) {
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perror("ioctl() failed");
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close(fd);
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exit(-1);
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}
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/* Bind to socket */
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rc = bind(fd, (struct sockaddr *) &servaddr, sizeof (servaddr));
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if (rc < 0) {
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perror("bind() failed");
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close(fd);
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exit(-1);
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}
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/* Listen on socket */
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listen(fd, 1);
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if (rc < 0) {
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perror("listen() failed");
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close(fd);
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exit(-1);
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}
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return fd;
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}
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static int waitServer(user_data_t * user_data) {
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struct timeval timeout;
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int rc;
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FD_ZERO(&user_data->fds);
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if (user_data->io >= 0) {
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FD_SET(user_data->io, &user_data->fds);
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}
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if (user_data->io_listen >= 0) {
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FD_SET(user_data->io_listen, &user_data->fds);
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}
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if (user_data->control_io >= 0) {
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FD_SET(user_data->control_io, &user_data->fds);
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}
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if (user_data->control_io_listen >= 0) {
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FD_SET(user_data->control_io_listen, &user_data->fds);
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}
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timeout.tv_sec = 5;
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timeout.tv_usec = 0;
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rc = select(FD_SETSIZE, &user_data->fds, NULL, NULL, &timeout);
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return rc;
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}
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static void processIoListen(user_data_t * user_data) {
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struct sockaddr_in cliaddr;
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socklen_t clilen;
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clilen = sizeof (cliaddr);
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user_data->io = accept(user_data->io_listen, (struct sockaddr *) &cliaddr, &clilen);
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user_data->fio = fdopen(user_data->io, "r+");
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printf("Connection established %s\r\n", inet_ntoa(cliaddr.sin_addr));
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}
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static void processSrqIoListen(user_data_t * user_data) {
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struct sockaddr_in cliaddr;
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socklen_t clilen;
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clilen = sizeof (cliaddr);
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user_data->control_io = accept(user_data->control_io_listen, (struct sockaddr *) &cliaddr, &clilen);
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printf("Control Connection established %s\r\n", inet_ntoa(cliaddr.sin_addr));
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}
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static void closeIo(user_data_t * user_data) {
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fclose(user_data->fio);
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user_data->fio = NULL;
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user_data->io = -1;
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}
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static void closeSrqIo(user_data_t * user_data) {
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close(user_data->control_io);
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user_data->control_io = -1;
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}
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static void processIo(user_data_t * user_data) {
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int rc;
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char smbuffer[10];
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rc = recv(user_data->io, smbuffer, sizeof (smbuffer), 0);
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if (rc < 0) {
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if (errno != EWOULDBLOCK) {
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closeIo(user_data);
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perror(" recv() failed");
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}
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} else if (rc == 0) {
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closeIo(user_data);
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printf("Connection closed\r\n");
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} else {
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SCPI_Input(&scpi_context, smbuffer, rc);
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}
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}
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static void processSrqIo(user_data_t * user_data) {
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int rc;
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char smbuffer[10];
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rc = recv(user_data->control_io, smbuffer, sizeof (smbuffer), 0);
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if (rc < 0) {
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if (errno != EWOULDBLOCK) {
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closeSrqIo(user_data);
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perror(" recv() failed");
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}
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} else if (rc == 0) {
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closeSrqIo(user_data);
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printf("Control Connection closed\r\n");
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} else {
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/* nothing to do */
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}
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}
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/*
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*
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*/
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int main(int argc, char** argv) {
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(void) argc;
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(void) argv;
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int rc;
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#ifdef __cplusplus
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user_data_t user_data = {
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/*.io_listen =*/ -1,
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/*.io =*/ -1,
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/*.control_io_listen =*/ -1,
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/*.control_io =*/ -1,
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/*.fio =*/ NULL,
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/*.fds =*/ 0,
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};
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#else
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user_data_t user_data = {
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.io_listen = -1,
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.io = -1,
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.control_io_listen = -1,
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.control_io = -1,
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.fio = NULL,
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};
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#endif
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/* user_context will be pointer to socket */
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SCPI_Init(&scpi_context,
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scpi_commands,
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&scpi_interface,
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scpi_units_def,
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SCPI_IDN1, SCPI_IDN2, SCPI_IDN3, SCPI_IDN4,
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scpi_input_buffer, SCPI_INPUT_BUFFER_LENGTH,
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scpi_error_queue_data, SCPI_ERROR_QUEUE_SIZE);
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scpi_context.user_context = &user_data;
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user_data.io_listen = createServer(5025);
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user_data.control_io_listen = createServer(CONTROL_PORT);
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while (1) {
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rc = waitServer(&user_data);
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if (rc < 0) { /* failed */
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perror("select failed");
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exit(-1);
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}
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if (rc == 0) { /* timeout */
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SCPI_Input(&scpi_context, NULL, 0);
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}
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if ((user_data.io_listen >= 0) && FD_ISSET(user_data.io_listen, &user_data.fds)) {
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processIoListen(&user_data);
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}
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if ((user_data.control_io_listen >= 0) && FD_ISSET(user_data.control_io_listen, &user_data.fds)) {
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processSrqIoListen(&user_data);
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}
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if ((user_data.io >= 0) && FD_ISSET(user_data.io, &user_data.fds)) {
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processIo(&user_data);
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}
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if ((user_data.control_io >= 0) && FD_ISSET(user_data.control_io, &user_data.fds)) {
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processSrqIo(&user_data);
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}
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}
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return (EXIT_SUCCESS);
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}
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