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  1. #include <termios.h>
  2. #include <stdio.h>
  3. #include <sys/types.h>
  4. #include <sys/stat.h>
  5. #include <fcntl.h>
  6. #include <pthread.h>
  7. #include <string.h>
  8. #include <unistd.h>
  9.  
  10. void *reader(void *arg);
  11. void nonblock();
  12.  
  13. int aa=0;
  14.  
  15. int main(void)
  16. {
  17.     struct termios backup, mine;
  18.     pthread_t thread;
  19.     int leng=256,charr;
  20.     char test[256]={0};
  21.  
  22.     printf("start...\n");
  23.  
  24.     aa = open("/dev/ttyS0", O_RDWR | O_NOCTTY);
  25.     if (aa < 0) return -1;
  26.  
  27.     tcgetattr(aa,&backup);
  28.     bzero(&mine,sizeof(mine));
  29.  
  30.     mine.c_cflag = B9600 | CS8 | CLOCAL | CREAD;
  31.     mine.c_iflag = IGNPAR | ICRNL;
  32.     mine.c_oflag = 0;
  33.     mine.c_lflag = 0;
  34.     mine.c_cc[VMIN] = 1;
  35.  
  36.     tcflush(aa,TCIFLUSH);
  37.     tcsetattr(aa,TCSANOW,&mine);
  38.  
  39.     if (pthread_create(&thread,NULL,reader,NULL)) return -1;
  40.  
  41.     nonblock();
  42.  
  43.     while(1)
  44.     {
  45.         if(charr == 'q') break;
  46.         charr=fgetc(stdin);
  47.         tcflush(aa,TCIFLUSH);
  48.         write(aa,&charr,1);
  49.         printf("Sending : %c\n",charr);
  50.  
  51.         usleep(100);
  52.     }
  53.  
  54.     tcsetattr(aa,TCSANOW,&backup);
  55.     close(aa);
  56.     nonblock();
  57.     return 0;
  58.  
  59. }
  60.  
  61. void *reader(void *arg)
  62. {
  63.     int tty=aa,leng=0;
  64.     char buffer[512]={0};
  65.     while(1)
  66.     {
  67.         leng=read(tty,buffer,sizeof(buffer));
  68.         if(leng > 0)
  69.         {
  70.             printf("Received : %s Length : %d\n",buffer,leng);
  71.         }
  72.         usleep(100);
  73.     }
  74.  
  75. }
  76.  
  77. void nonblock()
  78. {
  79.     static struct termios state;
  80.     static int status = 0;
  81.  
  82.     if(status == 0)
  83. 	{
  84.         tcgetattr(STDIN_FILENO,&state);
  85.         state.c_lflag &= ~ICANON;
  86.         state.c_lflag &= ~ECHO;
  87.         state.c_cc[VMIN] = 1;
  88.         status = 1;
  89.     }
  90.     else state.c_lflag |= (ICANON | ECHO);
  91.  
  92.     tcsetattr(STDIN_FILENO,TCSANOW,&state);
  93. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.c: In function ‘main’:
prog.c:20:10: warning: unused variable ‘test’ [-Wunused-variable]
     char test[256]={0};
          ^
prog.c:19:9: warning: unused variable ‘leng’ [-Wunused-variable]
     int leng=256,charr;
         ^
/home/BlE9pX/cc6GJJQ0.o: In function `main':
prog.c:(.text.startup+0xbe): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
stdout 
Standard output is empty
https://ideone.com/nwGSDj
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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