1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <stddef.h> 20 #include <termios.h> 21 #include <unistd.h> 22 #include "bsdtty.h" 23 #include <sys/file.h> 24 25 /* Flush pending data on FD. */ 26 int tcflush(int fd,int queue_selector)27tcflush (int fd, int queue_selector) 28 { 29 int arg; 30 31 switch (queue_selector) 32 { 33 case TCIFLUSH: 34 arg = FREAD; 35 break; 36 case TCOFLUSH: 37 arg = FWRITE; 38 break; 39 case TCIOFLUSH: 40 arg = FREAD | FWRITE; 41 break; 42 default: 43 __set_errno (EINVAL); 44 return -1; 45 } 46 47 return __ioctl (fd, TIOCFLUSH, (void *) &arg); 48 } 49