Beispiel #1
0
int cmd_ctty(char *param)
{ int f, attr, failed;

  if(!param || !*param) {
    displayString(TEXT_CMDHELP_CTTY);
    return 1;
  }

#ifdef DEBUG
  devAttr(0);
  devAttr(1);
  devAttr(2);
#endif

  if((f = devopen(param, O_RDWR)) < 0) {
    error_no_rw_device(param);
    return 1;
  }

  if(((attr = fdattr(f)) & 0x80) == 0
   || write(f, "\r\n", 2) != 2) {		/* need \r as in bin mode */
    close(f);
    error_no_rw_device(param);
    return 1;
  }

	/* Now inform the system that this device is the new console
		now; STDIN and STDOUT flag are the most lowest two bits  */
	fdsetattr(f, (attr & 0xFF) | 0x03);

  fflush(stdin);      /* prepare asynchroneous changes of internal fd's */
  fflush(stdout);
  fflush(stderr);

  /* Now change the file descriptors:
    0 := rdonly
    1,2 := wronly

    if CTTY is called within a pipe or its I/O is redirected,
    oldinfd or oldoutfd is not equal to -1. In such case the
    old*fd is modified in order to effect the file descriptor
    after the redirections are restored. Otherwise a pipe or
    redirection would left CTTY in a half-made status.
  */
  failed = dup2(f, 2);   /* no redirection support */
  if(oldinfd != -1)
  	close(oldinfd);
  oldinfd = f;
  if(oldoutfd != -1)
  	close(oldoutfd);
  if((oldoutfd = dup(f)) == -1)
  	failed = 1;

  if(failed)
    error_ctty_dup(param);

  return failed;
}
Beispiel #2
0
int cmd_ctty(char *param)
{ int fin, fout;
  int failed;

  if(!param || !*param) {
    displayString(TEXT_CMDHELP_CTTY);
    return 1;
  }

#ifdef DEBUG
  devAttr(0);
  devAttr(1);
  devAttr(2);
#endif

  if((fin = devopen(param, O_BINARY | O_RDONLY)) < 0
   || (fout = devopen(param, O_BINARY | O_WRONLY)) < 0) {
    close(fin);     /* if fin failed, close(-1) won't hurt */
    error_no_rw_device(param);
    return 1;
  }

  fflush(stdin);      /* prepare asynchroneous changes of internal fd's */
  fflush(stdout);
  fflush(stderr);

  /* Now change the file descriptors:
    0 := rdonly
    1,2 := wronly

    if CTTY is called within a pipe or its I/O is redirected,
    oldinfd or oldoutfd is not equal to -1. In such case the
    old*fd is modified in order to effect the file descriptor
    after the redirections are restored. Otherwise a pipe or
    redirection would left CTTY in a half-made status.
  */
  failed = dup2(fout, 2);   /* no redirection support */
  if(oldinfd == -1) {     /* stdin not redirected */
    failed = dup2(fin, 0) || failed;
    close(fin);
  } else  oldinfd = fin;
  if(oldoutfd == -1) {      /* stdout not redirected */
    failed = dup2(fout, 1) || failed;
    close(fout);
  } else  oldoutfd = fout;

  if(failed)
    error_ctty_dup(param);

  return failed;
}