COM포트로 들어오는 데이터를 파일에 쓰기...

소스 올립니다.
baud는
매크로로 이미 정의되어 있는게 있습니다.

/usr/include/termios.h 에
B9600, B19200 같은식으로 헤더에 있습니다.
더 많은 정보가 termios.h에 친절하게도 잘 되어 있네요.
주석 없어도 한눈에 보이니까 걱정 마시고 한번 보시면 좋을듯 합니다.

이건 제가 쓰는 용도가 고정되어 이렇게 쓰는것뿐이고
더 많은 기능을 알아보세요.

/*
 Copyright (c) 2002 Information Equipment co.,LTD.
 All Right Reserved.

 Code by JaeHyuk Cho <minzkn@infoeq.co.kr> 
*/

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/time.h>

int MZ_OpenSerial(void *s_DeviceName, int s_Baud);
int MZ_CloseSerial(int s_Handle);
int MZ_RecvSerial(int s_Handle, void *s_Buffer, int s_Length, int s_Timeout_Sec, int s_Timeout_uSec);
int MZ_SendSerial(int s_Handle, void *s_Buffer, int s_Length, int s_Timeout_Sec, int s_Timeout_uSec);

int MZ_OpenSerial(void *s_DeviceName, int s_Baud)
{
 int s_Return = (-1);
 if(s_DeviceName == (void *)0)s_DeviceName = "/dev/ttyS0";
 s_Return = open((char *)s_DeviceName, O_RDWR | O_NOCTTY | O_NONBLOCK, 0644);
 if(s_Return >= 0)
 {
  struct termios s_Termios;
  int s_Count;
  if(tcgetattr(s_Return, &s_Termios) == 0)
  {
   s_Termios.c_iflag     = IGNBRK | IGNPAR;
   s_Termios.c_oflag     = 0;
   s_Termios.c_cflag     = CS8 | CLOCAL;
   s_Termios.c_lflag     = 0;
   for(s_Count = 0;s_Count < NCCS;s_Count++)s_Termios.c_cc[s_Count] = 0;
   s_Termios.c_cc[VMIN]  = 1;
   s_Termios.c_cc[VTIME] = 0;
   if((cfsetispeed(&s_Termios, s_Baud) < 0) || (cfsetispeed(&s_Termios, s_Baud) < 0))
   {
    close(s_Return);
    s_Return = (-1);
    fprintf(stderr, "%s: %s - [ERROR] Can not set speed !!!\n", __FILE__, __FUNCTION__);
   }
   else
   {
    if(tcsetattr(s_Return, TCSANOW, &s_Termios) < 0)
    {
     close(s_Return);
     s_Return = (-1);
     fprintf(stderr, "%s: %s - [ERROR] Can not set attr !!!\n", __FILE__, __FUNCTION__);
    }
    else
    {
     if(tcflush(s_Return, TCIOFLUSH) < 0)
     {
      close(s_Return);
      s_Return = (-1);
      fprintf(stderr, "%s: %s - [ERROR] Can not flush tcio !!!\n", __FILE__, __FUNCTION__);
     }
    } 
   }
  }
  else 
  {
   close(s_Return);
   s_Return = (-1);   
   fprintf(stderr, "%s: %s - [ERROR] Can not get termios structure !!!\n", __FILE__, __FUNCTION__);
  }
 }
 else fprintf(stderr, "%s: %s - [ERROR] Can not open serial device \"%s\" !!!\n", __FILE__, __FUNCTION__, (char *)s_DeviceName);
 return(s_Return); 
}

int MZ_CloseSerial(int s_Handle)
{
 if(s_Handle >= 0)close(s_Handle);
 s_Handle = (-1); 
 return(s_Handle);
}

int MZ_RecvSerial(int s_Handle, void *s_Buffer, int s_Length, int s_Timeout_Sec, int s_Timeout_uSec)
{
 int s_Return = (-1);	
 struct timeval s_TimeVal;
 fd_set s_fdread;    
 int s_IsSelect, s_IsFDRead, s_RecvSize;
 if(s_Handle >= 0)
 {
  if(s_Buffer)
  {
   if(s_Length > 0)
   {
    do
    {
     FD_ZERO(&s_fdread);
     FD_SET(s_Handle, &s_fdread);
     s_TimeVal.tv_sec  = (s_Timeout_Sec >= 0 ? s_Timeout_Sec : 1);
     s_TimeVal.tv_usec = (s_Timeout_uSec >= 0 ? s_Timeout_uSec : 1);
     s_IsSelect = select(s_Handle + 1, &s_fdread, (fd_set *)0, (fd_set *)0, &s_TimeVal);
     s_IsFDRead = FD_ISSET(s_Handle, &s_fdread);
     if(s_IsSelect > 0 && s_IsFDRead != 0)
     {
      if(s_Return < 0)s_Return = 0;	     
      s_RecvSize = read(s_Handle, (void *)(((char *)s_Buffer) + s_Return), s_Length);
      if(s_RecvSize > 0)
      {
       s_Return += s_RecvSize;
       s_Length -= s_RecvSize;
      }
      else 
      {
       if(s_RecvSize < 0)fprintf(stderr, "%s: %s - [ERROR] Serial error !!!\n", __FILE__, __FUNCTION__);
       break; 
      }
     }
     else break; 
    }while(s_Length > 0);
   }
   else fprintf(stderr, "%s: %s - [ERROR] s_Length <= 0 !!!\n", __FILE__, __FUNCTION__); 
  }
  else fprintf(stderr, "%s: %s - [ERROR] s_Buffer is null !!!\n", __FILE__, __FUNCTION__); 
 }
 else fprintf(stderr, "%s: %s - [ERROR] s_Handle < 0 !!!\n", __FILE__, __FUNCTION__); 
 return(s_Return);
} 

int MZ_SendSerial(int s_Handle, void *s_Buffer, int s_Length, int s_Timeout_Sec, int s_Timeout_uSec)
{
 int s_Return = (-1);	
 int s_SendSize;
 (void)s_Timeout_Sec, (void)s_Timeout_uSec;
 if(s_Handle >= 0)
 {
  if(s_Buffer)
  {
   if(s_Length > 0)
   {
    do
    {
     if(s_Return < 0)s_Return = 0;	    
     s_SendSize = write(s_Handle, (void *)(((char *)s_Buffer) + s_Return), s_Length);
     if(s_SendSize > 0)
     {
      s_Return += s_SendSize;
      s_Length -= s_SendSize;
     }
     else 
     {
      if(s_SendSize < 0)fprintf(stderr, "%s: %s - [ERROR] Serial error !!!\n", __FILE__, __FUNCTION__);
      break; 
     }
    }while(s_Length > 0);
   }
   else fprintf(stderr, "%s: %s - [ERROR] s_Length <= 0 !!!\n", __FILE__, __FUNCTION__); 
  }
  else fprintf(stderr, "%s: %s - [ERROR] s_Buffer is null !!!\n", __FILE__, __FUNCTION__); 
 }
 else fprintf(stderr, "%s: %s - [ERROR] s_Handle < 0 !!!\n", __FILE__, __FUNCTION__); 
 return(s_Return);
} 

/* End of source */