mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
8bdaddd81d
The stdio reader thread now appears to be working recursively along cosmopolitan subprocesses. For example, it's now possible to launch vim.com from the unbourne.com bestline repl, thanks to hacks plus a bug fix to select() timeouts.
101 lines
4.1 KiB
C
101 lines
4.1 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/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/pollfd.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/errfuns.h"
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/* TODO(jart): DELETE */
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static int ttyident_probe(struct TtyIdent *ti, int ttyinfd, int ttyoutfd,
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const char *msg) {
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ssize_t rc;
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size_t got;
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char buf[64];
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int id, version;
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if ((rc = write(ttyoutfd, msg, strlen(msg))) != -1) {
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TryAgain:
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if ((rc = read(ttyinfd, buf, sizeof(buf))) != -1) {
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buf[min((got = (size_t)rc), sizeof(buf) - 1)] = '\0';
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if (sscanf(buf, "\e[>%d;%d", &id, &version) >= 1) {
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ti->id = id;
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ti->version = version;
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rc = 0;
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} else {
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rc = eio();
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}
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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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if (poll((struct pollfd[]){{ttyinfd, POLLIN}}, 1, 100) != 0) {
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goto TryAgain;
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} else {
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rc = etimedout();
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}
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}
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}
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return rc;
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}
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/**
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* Identifies teletypewriter.
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*
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* For example, we can tell if process is running in a GNU Screen
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* session Gnome Terminal.
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*
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* @return object if TTY responds, or NULL w/ errno
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* @see ttyidentclear()
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*/
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int ttyident(struct TtyIdent *ti, int ttyinfd, int ttyoutfd) {
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int rc;
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struct termios old;
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struct TtyIdent outer;
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rc = -1;
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if (!IsWindows()) {
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if (ttyconfig(ttyinfd, ttysetrawdeadline, 3, &old) != -1) {
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if (ttyident_probe(ti, ttyinfd, ttyoutfd, "\e[>c") != -1) {
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rc = 0;
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memset(&outer, 0, sizeof(outer));
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if (ti->id == 83 /* GNU Screen */ && (ti->next || _weaken(malloc)) &&
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ttyident_probe(&outer, ttyinfd, ttyoutfd, "\eP\e[>c\e\\") != -1 &&
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(ti->next =
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(ti->next ? ti->next
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: _weaken(malloc)(sizeof(struct TtyIdent))))) {
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memcpy(ti->next, &outer, sizeof(outer));
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} else {
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free(ti->next);
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ti->next = 0;
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}
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}
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ttyrestore(ttyinfd, &old);
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}
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}
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return rc;
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}
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