61 lines
2.8 KiB
C
61 lines
2.8 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 2020 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 "dsp/tty/tty.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/termios.h"
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#include "libc/errno.h"
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#include "libc/sock/sock.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/consts/termios.h"
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/* TODO(jart): DELETE */
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/**
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* Sends data to teletypewriter the pain-free way.
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*
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* This function blocks forever until the full amount is transmitted,
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* regardless of whether or not the character device is in non-blocking
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* mode, regardless of whether or not it's interrupted by a signal. It
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* can still be escaped by longjmp'ing out of a signal handler.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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ssize_t ttywrite(int fd, const void *data, size_t size) {
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char *p;
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ssize_t rc;
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size_t wrote, n;
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p = data;
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n = size;
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do {
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TryAgain:
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if ((rc = write(fd, p, n)) != -1) {
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wrote = rc;
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p += wrote;
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n -= wrote;
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} else if (errno == EINTR) {
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goto TryAgain;
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} else if (errno == EAGAIN) {
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poll((struct pollfd[]){{fd, POLLOUT}}, 1, -1);
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} else {
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return -1;
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}
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} while (n);
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return 0;
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}
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