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glibc  2.9
tcflush.c
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00001 /* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <stddef.h>
00021 #include <termios.h>
00022 #include <unistd.h>
00023 #include "bsdtty.h"
00024 #include <sys/file.h>
00025 
00026 /* Flush pending data on FD.  */
00027 int
00028 tcflush (fd, queue_selector)
00029      int fd;
00030      int queue_selector;
00031 {
00032   int arg;
00033 
00034   switch (queue_selector)
00035     {
00036     case TCIFLUSH:
00037       arg = FREAD;
00038       break;
00039     case TCOFLUSH:
00040       arg = FWRITE;
00041       break;
00042     case TCIOFLUSH:
00043       arg = FREAD | FWRITE;
00044       break;
00045     default:
00046       __set_errno (EINVAL);
00047       return -1;
00048     }
00049 
00050   return __ioctl (fd, TIOCFLUSH, (void *) &arg);
00051 }