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b7459e56bd
* time/strftime.c: Support - and _ flags to affect number padding. * sysdeps/unix/common/tcsendbrk.c: New file.
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/* Send break to terminal.
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Copyright (C) 1996 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <errno.h>
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#include <stddef.h>
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#include <termios.h>
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#include <sys/ioctl.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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/* 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 milliseconds to break. */
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if (duration <= 0)
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return __ioctl (fd, TCSBRK, 0);
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#ifdef TCSBRKP
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/* Probably Linux-specific: a positive third TCSBRKP ioctl argument is
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defined to be the number of 100ms units to break. */
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return __ioctl (fd, TCSBRKP, (duration + 99) / 100);
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#else
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/* ioctl can't send a break of any other duration for us.
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This could be changed to use trickery (e.g. lower speed and
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send a '\0') to send the break, but for now just return an error. */
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errno = EINVAL;
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return -1;
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#endif
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}
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