linux下多线程多串口数据转发程序

linux下多线程多串口数据转发程序

#include <sys/types.h>#include <sys/socket.h>#include <linux/in.h>#include <linux/un.h>#include <string.h>#include <signal.h>#include <stdio.h>#include <stdlib.h>#include <malloc.h>#include <errno.h>#include <unistd.h>#include <unistd.h>#include <signal.h>#include <sys/ioctl.h>#include <pthread.h>#include <sys/time.h>#include <sys/select.h>#include <fcntl.h>#include <unistd.h>#include"modbus.h"void *modbus_server_client_thread(){  while(1)       {      sleep(1);      modbus_t *mb;      int16_t tab_reg[32]={0};      mb = modbus_new_rtu("/dev/ttySAC2",19200,'N',8,1);//open port      modbus_set_slave(mb,1);//set slave address      modbus_connect(mb);      struct timeval t;      t.tv_sec=0;      t.tv_usec=1000000;//set modbus time 1000ms      modbus_set_response_timeout(mb,&t);      int regs=modbus_read_registers(mb, 30, 10, tab_reg);       printf("%d %d %d %d %d %d %d %d %d %d %d\n",regs,tab_reg[0],tab_reg[1],tab_reg[2],tab_reg[3],tab_reg[4],tab_reg[5],tab_reg[6],tab_reg[7],tab_reg[8],tab_reg[9]);      modbus_free(mb);      modbus_close(mb);        }}void *modbus_server_slave_thread(){  while(1)       {                     int socket;        modbus_t *ctx;        modbus_mapping_t *mb_mapping;        int rc;        int use_backend;        ctx = modbus_new_rtu("/dev/ttySAC3", 19200, 'N', 8, 1);        modbus_set_slave(ctx, 1);        modbus_connect(ctx);        mb_mapping = modbus_mapping_new(MODBUS_MAX_READ_BITS, 0,                                    MODBUS_MAX_READ_REGISTERS, 0);        if (mb_mapping == NULL) {        fprintf(stderr, "Failed to allocate the mapping: %s\n",                modbus_strerror(errno));        modbus_free(ctx);        return ;        }        for(;;) {        uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH];        rc = modbus_receive(ctx, query);        if (rc >= 0) {            modbus_reply(ctx, query, rc, mb_mapping);                    printf("%d,%d,%d,%d, %d,%d,%d,%d, %d,%d,%d,%d, %d,%d,%d,%d, %d,%d,%d,%d\n",query[0],query[1],query[2],query[3],query[4],query[5],query[6],query[7],query[8],query[9],query[10],query[11],query[12],query[13],query[14],query[15],query[16],query[17],query[18],query[19]);        } else {            /* Connection closed by the client or server */            break;        }        }        printf("Quit the loop: %s\n", modbus_strerror(errno));        modbus_mapping_free(mb_mapping);        close(socket);        modbus_free(ctx);       }}void main(){  int ret;  pthread_t  modbus_client_thread,modbus_slave_thread;  pthread_create(&modbus_client_thread,NULL,modbus_server_client_thread,NULL);  pthread_create(&modbus_slave_thread,NULL,modbus_server_slave_thread,NULL);    /*等待线程结束*/   pthread_join(modbus_client_thread,NULL);//pthread_join会阻塞主线程，等待子线程结束。  pthread_join(modbus_slave_thread,NULL);  return;}

一个线程串口当主机采集数据，另一个线程串口当从机发送数据。利用libmodbus库，动态编译生成后，运行程序。