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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* Copyright (C) 1991-2025 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 <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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tcflow (int fd, 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, (void *) NULL);
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case TCOON:
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return __ioctl (fd, TIOCSTART, (void *) 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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__set_errno (EINVAL);
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return -1;
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}
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}
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