mirror of
https://github.com/RGBCube/serenity
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5391836468
Only keep track of that (and eventually close() it) internally instead. This argument is not present on other systems, so we were running into compatibility issues with ports. Also bring the implementation closer to Linux and OpenBSD by making sure to close the slave pty fd in the fork()'d child as well as _exit()'ing on login_tty() failure - it's non-POSIX, so those are our references here. :^)
117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <fcntl.h>
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#include <pty.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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int openpty(int* amaster, int* aslave, char* name, const struct termios* termp, const struct winsize* winp)
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{
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*amaster = posix_openpt(O_RDWR);
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if (*amaster < 0) {
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return -1;
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}
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if (grantpt(*amaster) < 0) {
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int error = errno;
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close(*amaster);
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errno = error;
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return -1;
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}
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if (unlockpt(*amaster) < 0) {
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int error = errno;
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close(*amaster);
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errno = error;
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return -1;
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}
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const char* tty_name = ptsname(*amaster);
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if (!tty_name) {
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int error = errno;
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close(*amaster);
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errno = error;
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return -1;
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}
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if (name) {
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/* The spec doesn't say how large name has to be. Good luck. */
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[[maybe_unused]] auto rc = strlcpy(name, tty_name, 128);
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}
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*aslave = open(tty_name, O_RDWR | O_NOCTTY);
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if (*aslave < 0) {
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int error = errno;
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close(*amaster);
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errno = error;
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return -1;
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}
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if (termp) {
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// FIXME: error handling
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tcsetattr(*aslave, TCSAFLUSH, termp);
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}
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if (winp) {
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// FIXME: error handling
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ioctl(*aslave, TIOCGWINSZ, winp);
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}
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dbgln("openpty, master={}, slave={}, tty_name={}", *amaster, *aslave, tty_name);
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return 0;
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}
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pid_t forkpty(int* amaster, char* name, const struct termios* termp, const struct winsize* winp)
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{
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int master;
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int slave;
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if (openpty(&master, &slave, name, termp, winp) < 0)
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return -1;
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pid_t pid = fork();
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if (pid < 0) {
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close(master);
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close(slave);
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return -1;
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}
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if (pid == 0) {
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close(master);
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if (login_tty(slave) < 0)
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_exit(1);
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return 0;
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}
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*amaster = master;
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close(slave);
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return pid;
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}
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int login_tty(int fd)
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{
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setsid();
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close(0);
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close(1);
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close(2);
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int rc = dup2(fd, 0);
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if (rc < 0)
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return rc;
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rc = dup2(fd, 1);
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if (rc < 0)
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return -1;
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rc = dup2(fd, 2);
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if (rc < 0)
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return rc;
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rc = close(fd);
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if (rc < 0)
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return rc;
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rc = ioctl(0, TIOCSCTTY);
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if (rc < 0)
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return rc;
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return 0;
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}
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