58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* Copyright (C) 1991, 1992 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 <ansidecl.h>
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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 <unistd.h>
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#include "bsdtty.h"
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/* Suspend or restart transmission on FD. */
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int
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DEFUN(tcflow, (fd, action), int fd AND int action)
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{
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switch (action)
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{
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case TCOOFF:
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return __ioctl(fd, TIOCSTOP, (PTR) NULL);
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case TCOON:
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return __ioctl(fd, TIOCSTART, (PTR) NULL);
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case TCIOFF:
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case TCION:
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{
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/* This just writes the START or STOP character with
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`write'. Is there another way to do this? */
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struct termios attr;
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unsigned char c;
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if (tcgetattr(fd, &attr) < 0)
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return -1;
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c = attr.c_cc[action == TCIOFF ? VSTOP : VSTART];
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if (c != _POSIX_VDISABLE && write (fd, &c, 1) < 1)
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return -1;
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return 0;
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}
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default:
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errno = EINVAL;
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return -1;
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}
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}
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