mirror of
https://github.com/jart/cosmopolitan.git
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46 lines
2.6 KiB
C
46 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/termios.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/termios.h"
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#include "libc/dce.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Changes flow of teletypewriter data.
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*
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* - `TCOOFF` suspends output
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* - `TCOON` resumes output
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* - `TCIOFF` transmits a STOP character
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* - `TCION` transmits a START character
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*/
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int tcflow(int fd, int action) {
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uint8_t c;
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struct termios t;
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if (!IsBsd()) return sys_ioctl(fd, TCXONC, action);
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if (action == TCOOFF) return sys_ioctl(fd, TIOCSTOP, 0);
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if (action == TCOON) return sys_ioctl(fd, TIOCSTART, 0);
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if (action != TCIOFF && action != TCION) return einval();
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if (tcgetattr(fd, &t) == -1) return -1;
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if ((c = t.c_cc[action == TCIOFF ? VSTOP : VSTART]) != 255) {
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if (sys_write(fd, &c, 1) == -1) return -1;
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}
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return 0;
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}
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