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- /* Send break to terminal.
- Copyright (C) 1996, 1997 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include <errno.h>
- #include <stddef.h>
- #include <termios.h>
- #include <sys/ioctl.h>
- /* Send zero bits on FD. */
- int
- tcsendbreak (int fd, int duration)
- {
- /* The break lasts 0.25 to 0.5 seconds if DURATION is zero,
- and an implementation-defined period if DURATION is nonzero.
- We define a positive DURATION to be number of milliseconds to break. */
- if (duration <= 0)
- return ioctl (fd, TCSBRK, 0);
- #ifdef TCSBRKP
- /* Probably Linux-specific: a positive third TCSBRKP ioctl argument is
- defined to be the number of 100ms units to break. */
- return ioctl (fd, TCSBRKP, (duration + 99) / 100);
- #else
- /* ioctl can't send a break of any other duration for us.
- This could be changed to use trickery (e.g. lower speed and
- send a '\0') to send the break, but for now just return an error. */
- __set_errno (EINVAL);
- return -1;
- #endif
- }
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