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- /* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <errno.h>
- #include <stddef.h>
- #include <termios.h>
- #include <unistd.h>
-
- #include "bsdtty.h"
-
- /* Suspend or restart transmission on FD. */
- int
- DEFUN(tcflow, (fd, action), int fd AND int action)
- {
- switch (action)
- {
- case TCOOFF:
- return __ioctl(fd, TIOCSTOP, (PTR) NULL);
- case TCOON:
- return __ioctl(fd, TIOCSTART, (PTR) NULL);
-
- case TCIOFF:
- case TCION:
- {
- /* This just writes the START or STOP character with
- `write'. Is there another way to do this? */
- struct termios attr;
- unsigned char c;
- if (tcgetattr(fd, &attr) < 0)
- return -1;
- c = attr.c_cc[action == TCIOFF ? VSTOP : VSTART];
- if (c != _POSIX_VDISABLE && write (fd, &c, 1) < 1)
- return -1;
- return 0;
- }
-
- default:
- errno = EINVAL;
- return -1;
- }
- }
-