Forum Debian Users Gang

// ser.c 
#include <stdio.h> 
#include <string.h> 
#include <unistd.h> 
#include <fcntl.h> 
#include <errno.h> 
#include <termios.h> 

int open_port(void) 
{ 
    int fd; 

    fd = open("/dev/ttyS1", O_RDWR|O_NOCTTY|O_NDELAY); 
    if (fd == -1) 
    { 
    perror("open_port: Unable open port"); 
    } 
    else 
    fcntl(fd, F_SETFL, 0); 
     
    return(fd); 
} 

void close_port(int fd) 
{ 
    close(fd); 
} 

int main(void) 
{ 
  int loc_fd; 
  loc_fd = open_port(); 
  if (loc_fd == -1) 
  { 
    return(-1); 
  } 
  else 
  { 
    sleep(5); 
    close_port(loc_fd); 
    return(-1); 
  } 
}