| /* Send break to terminal. |
| Copyright (C) 1996-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #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 |
| } |
