98 lines
4.0 KiB
C
98 lines
4.0 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/bits/safemacros.h"
|
|
#include "libc/bits/weaken.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/termios.h"
|
|
#include "libc/fmt/fmt.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sock/sock.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/poll.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/* TODO(jart): DELETE */
|
|
|
|
static int ttyident_probe(struct TtyIdent *ti, int ttyinfd, int ttyoutfd,
|
|
const char *msg) {
|
|
ssize_t rc;
|
|
size_t got;
|
|
char buf[64];
|
|
int id, version;
|
|
if ((rc = write(ttyoutfd, msg, strlen(msg))) != -1) {
|
|
TryAgain:
|
|
if ((rc = read(ttyinfd, buf, sizeof(buf))) != -1) {
|
|
buf[min((got = (size_t)rc), sizeof(buf) - 1)] = '\0';
|
|
if (sscanf(buf, "\e[>%d;%d", &id, &version) >= 1) {
|
|
ti->id = id;
|
|
ti->version = version;
|
|
rc = 0;
|
|
} else {
|
|
rc = eio();
|
|
}
|
|
} else if (errno == EINTR) {
|
|
goto TryAgain;
|
|
} else if (errno == EAGAIN) {
|
|
if (poll((struct pollfd[]){{ttyinfd, POLLIN}}, 1, 100) != 0) {
|
|
goto TryAgain;
|
|
} else {
|
|
rc = etimedout();
|
|
}
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Identifies teletypewriter.
|
|
*
|
|
* For example, we can tell if process is running in a GNU Screen
|
|
* session Gnome Terminal.
|
|
*
|
|
* @return object if TTY responds, or NULL w/ errno
|
|
* @see ttyidentclear()
|
|
*/
|
|
int ttyident(struct TtyIdent *ti, int ttyinfd, int ttyoutfd) {
|
|
int rc;
|
|
struct termios old;
|
|
struct TtyIdent outer;
|
|
rc = -1;
|
|
if (!IsWindows()) {
|
|
if (ttyconfig(ttyinfd, ttysetrawdeadline, 3, &old) != -1) {
|
|
if (ttyident_probe(ti, ttyinfd, ttyoutfd, "\e[>c") != -1) {
|
|
rc = 0;
|
|
memset(&outer, 0, sizeof(outer));
|
|
if (ti->id == 83 /* GNU Screen */ && (ti->next || weaken(malloc)) &&
|
|
ttyident_probe(&outer, ttyinfd, ttyoutfd, "\eP\e[>c\e\\") != -1 &&
|
|
(ti->next = (ti->next ? ti->next
|
|
: weaken(malloc)(sizeof(struct TtyIdent))))) {
|
|
memcpy(ti->next, &outer, sizeof(outer));
|
|
} else {
|
|
free_s(&ti->next);
|
|
}
|
|
}
|
|
ttyrestore(ttyinfd, &old);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|