| /* Copyright (C) 1991-2018 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 <signal.h> |
| #include <termios.h> |
| #include <unistd.h> |
| #include "bsdtty.h" |
| #include <sys/file.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| |
| /* Send zero bits on FD. */ |
| int |
| tcsendbreak (int fd, int duration) |
| { |
| struct timeval delay; |
| |
| /* 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 microseconds to break. */ |
| if (duration <= 0) |
| duration = 400000; |
| |
| delay.tv_sec = 0; |
| delay.tv_usec = duration; |
| |
| /* Starting sending break. */ |
| if (__ioctl (fd, TIOCSBRK, (void *) NULL) < 0) |
| return -1; |
| |
| /* Wait DURATION microseconds. */ |
| (void) __select (0, (fd_set *) NULL, (fd_set *) NULL, (fd_set *) NULL, |
| &delay); |
| |
| /* Turn off the break. */ |
| return __ioctl (fd, TIOCCBRK, (void *) NULL); |
| } |