60 lines
2.9 KiB
C
60 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "dsp/tty/tty.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/termios.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/sock/sock.h"
|
|
#include "libc/sysv/consts/poll.h"
|
|
#include "libc/sysv/consts/termios.h"
|
|
|
|
/**
|
|
* Sends data to teletypewriter the pain-free way.
|
|
*
|
|
* This function blocks forever until the full amount is transmitted,
|
|
* regardless of whether or not the character device is in non-blocking
|
|
* mode, regardless of whether or not it's interrupted by a signal. It
|
|
* can still be escaped by longjmp'ing out of a signal handler.
|
|
*
|
|
* @return 0 on success, or -1 w/ errno
|
|
*/
|
|
ssize_t ttywrite(int fd, const void *data, size_t size) {
|
|
char *p;
|
|
ssize_t rc;
|
|
size_t wrote, n;
|
|
p = data;
|
|
n = size;
|
|
do {
|
|
TryAgain:
|
|
if ((rc = write(fd, p, n)) != -1) {
|
|
wrote = rc;
|
|
p += wrote;
|
|
n -= wrote;
|
|
} else if (errno == EINTR) {
|
|
goto TryAgain;
|
|
} else if (errno == EAGAIN) {
|
|
poll((struct pollfd[]){{fd, POLLOUT}}, 1, -1);
|
|
} else {
|
|
return -1;
|
|
}
|
|
} while (n);
|
|
return 0;
|
|
}
|