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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stddef.h>
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#include <signal.h>
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#include <termios.h>
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#include <unistd.h>
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#include "bsdtty.h"
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/types.h>
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/* Send zero bits on FD. */
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int
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tcsendbreak (int fd, int duration)
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{
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struct timeval delay;
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/* The break lasts 0.25 to 0.5 seconds if DURATION is zero,
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and an implementation-defined period if DURATION is nonzero.
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We define a positive DURATION to be number of microseconds to break. */
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if (duration <= 0)
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duration = 400000;
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delay.tv_sec = 0;
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delay.tv_usec = duration;
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/* Starting sending break. */
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if (__ioctl (fd, TIOCSBRK, (void *) NULL) < 0)
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return -1;
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/* Wait DURATION microseconds. */
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(void) __select (0, (fd_set *) NULL, (fd_set *) NULL, (fd_set *) NULL,
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&delay);
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/* Turn off the break. */
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return __ioctl (fd, TIOCCBRK, (void *) NULL);
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}
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