^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Added support for a Unix98-style ptmx device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/tty_flip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/major.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/devpts_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #undef TTY_DEBUG_HANGUP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #ifdef TTY_DEBUG_HANGUP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) # define tty_debug_hangup(tty, f, args...) do {} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifdef CONFIG_UNIX98_PTYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static struct tty_driver *ptm_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static struct tty_driver *pts_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static DEFINE_MUTEX(devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static void pty_close(struct tty_struct *tty, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) BUG_ON(!tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (tty->driver->subtype == PTY_TYPE_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) WARN_ON(tty->count > 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (tty_io_error(tty))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (tty->count > 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) set_bit(TTY_IO_ERROR, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) wake_up_interruptible(&tty->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) wake_up_interruptible(&tty->write_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) spin_lock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) tty->packet = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) spin_unlock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* Review - krefs on tty_link ?? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (!tty->link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) wake_up_interruptible(&tty->link->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) wake_up_interruptible(&tty->link->write_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (tty->driver->subtype == PTY_TYPE_MASTER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) set_bit(TTY_OTHER_CLOSED, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #ifdef CONFIG_UNIX98_PTYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (tty->driver == ptm_driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) mutex_lock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (tty->link->driver_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) devpts_pty_kill(tty->link->driver_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) mutex_unlock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) tty_vhangup(tty->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * The unthrottle routine is called by the line discipline to signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * that it can receive more characters. For PTY's, the TTY_THROTTLED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * flag is always set, to force the line discipline to always call the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * characters in the queue. This is necessary since each time this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * happens, we need to wake up any sleeping processes that could be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * for the pty buffer to be drained.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static void pty_unthrottle(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) tty_wakeup(tty->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) set_bit(TTY_THROTTLED, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * pty_write - write to a pty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * @tty: the tty we write from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * @buf: kernel buffer of data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * @c: bytes to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * Our "hardware" write method. Data is coming from the ldisc which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * may be in a non sleeping state. We simply throw this at the other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * end of the link as if we were an IRQ handler receiving stuff for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * the other side of the pty/tty pair.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct tty_struct *to = tty->link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (tty->stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (c > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) spin_lock_irqsave(&to->port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Stuff the data into the input queue of the other end */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) c = tty_insert_flip_string(to->port, buf, c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) spin_unlock_irqrestore(&to->port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* And shovel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) tty_flip_buffer_push(to->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * pty_write_room - write space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * @tty: tty we are writing from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * Report how many bytes the ldisc can send into the queue for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * the other device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int pty_write_room(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (tty->stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return tty_buffer_space_avail(tty->link->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * pty_chars_in_buffer - characters currently in our tx queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * @tty: our tty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * Report how much we have in the transmit queue. As everything is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * instantly at the other end this is easy to implement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static int pty_chars_in_buffer(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* Set the lock flag on a pty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static int pty_set_lock(struct tty_struct *tty, int __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (get_user(val, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) set_bit(TTY_PTY_LOCK, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) clear_bit(TTY_PTY_LOCK, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static int pty_get_lock(struct tty_struct *tty, int __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return put_user(locked, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /* Set the packet mode on a pty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int pktmode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (get_user(pktmode, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) spin_lock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (pktmode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (!tty->packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) tty->link->ctrl_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) tty->packet = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) tty->packet = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) spin_unlock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* Get the packet mode of a pty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int pktmode = tty->packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return put_user(pktmode, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /* Send a signal to the slave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static int pty_signal(struct tty_struct *tty, int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) struct pid *pgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (tty->link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) pgrp = tty_get_pgrp(tty->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (pgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) kill_pgrp(pgrp, sig, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) put_pid(pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static void pty_flush_buffer(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct tty_struct *to = tty->link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) tty_buffer_flush(to, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (to->packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) spin_lock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) wake_up_interruptible(&to->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) spin_unlock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static int pty_open(struct tty_struct *tty, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (!tty || !tty->link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) clear_bit(TTY_IO_ERROR, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) set_bit(TTY_THROTTLED, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) set_bit(TTY_IO_ERROR, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static void pty_set_termios(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct ktermios *old_termios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /* See if packet mode change of state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (tty->link && tty->link->packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int extproc = (old_termios->c_lflag & EXTPROC) | L_EXTPROC(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int old_flow = ((old_termios->c_iflag & IXON) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) (old_termios->c_cc[VSTOP] == '\023') &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) (old_termios->c_cc[VSTART] == '\021'));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) int new_flow = (I_IXON(tty) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) STOP_CHAR(tty) == '\023' &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) START_CHAR(tty) == '\021');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if ((old_flow != new_flow) || extproc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) spin_lock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (old_flow != new_flow) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (new_flow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) tty->ctrl_status |= TIOCPKT_DOSTOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) tty->ctrl_status |= TIOCPKT_NOSTOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (extproc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) tty->ctrl_status |= TIOCPKT_IOCTL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) spin_unlock_irq(&tty->ctrl_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) wake_up_interruptible(&tty->link->read_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) tty->termios.c_cflag &= ~(CSIZE | PARENB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) tty->termios.c_cflag |= (CS8 | CREAD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * pty_do_resize - resize event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * @tty: tty being resized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * @ws: window size being set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * Update the termios variables and send the necessary signals to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * peform a terminal resize correctly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static int pty_resize(struct tty_struct *tty, struct winsize *ws)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct pid *pgrp, *rpgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct tty_struct *pty = tty->link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* For a PTY we need to lock the tty side */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) mutex_lock(&tty->winsize_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* Signal the foreground process group of both ptys */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) pgrp = tty_get_pgrp(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) rpgrp = tty_get_pgrp(pty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (pgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) kill_pgrp(pgrp, SIGWINCH, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (rpgrp != pgrp && rpgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) kill_pgrp(rpgrp, SIGWINCH, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) put_pid(pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) put_pid(rpgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) tty->winsize = *ws;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) pty->winsize = *ws; /* Never used so will go away soon */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) mutex_unlock(&tty->winsize_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * pty_start - start() handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * pty_stop - stop() handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * @tty: tty being flow-controlled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * Propagates the TIOCPKT status to the master pty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * NB: only the master pty can be in packet mode so only the slave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * needs start()/stop() handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static void pty_start(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (tty->link && tty->link->packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) spin_lock_irqsave(&tty->ctrl_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) tty->ctrl_status &= ~TIOCPKT_STOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) tty->ctrl_status |= TIOCPKT_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) spin_unlock_irqrestore(&tty->ctrl_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) wake_up_interruptible_poll(&tty->link->read_wait, EPOLLIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static void pty_stop(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (tty->link && tty->link->packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) spin_lock_irqsave(&tty->ctrl_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) tty->ctrl_status &= ~TIOCPKT_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) tty->ctrl_status |= TIOCPKT_STOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) spin_unlock_irqrestore(&tty->ctrl_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) wake_up_interruptible_poll(&tty->link->read_wait, EPOLLIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * pty_common_install - set up the pty pair
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * @driver: the pty driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * @tty: the tty being instantiated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * @legacy: true if this is BSD style
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * Perform the initial set up for the tty/pty pair. Called from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * tty layer when the port is first opened.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * Locking: the caller must hold the tty_mutex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) bool legacy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct tty_struct *o_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct tty_port *ports[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) int idx = tty->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) int retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* Opening the slave first has always returned -EIO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (driver->subtype != PTY_TYPE_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (!ports[0] || !ports[1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (!try_module_get(driver->other->owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* This cannot in fact currently happen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) o_tty = alloc_tty_struct(driver->other, idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (!o_tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) goto err_put_module;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) tty_set_lock_subclass(o_tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) if (legacy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) /* We always use new tty termios data so we can do this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) the easy way .. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) tty_init_termios(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) tty_init_termios(o_tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) driver->other->ttys[idx] = o_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) driver->ttys[idx] = tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) memset(&tty->termios_locked, 0, sizeof(tty->termios_locked));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) tty->termios = driver->init_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) o_tty->termios = driver->other->init_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * Everything allocated ... set up the o_tty structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) tty_driver_kref_get(driver->other);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) /* Establish the links in both directions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) tty->link = o_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) o_tty->link = tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) tty_port_init(ports[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) tty_port_init(ports[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) tty_buffer_set_limit(ports[0], 8192);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) tty_buffer_set_limit(ports[1], 8192);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) o_tty->port = ports[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) tty->port = ports[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) o_tty->port->itty = o_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) tty_buffer_set_lock_subclass(o_tty->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) tty_driver_kref_get(driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) tty->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) o_tty->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) err_put_module:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) module_put(driver->other->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) kfree(ports[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) kfree(ports[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) static void pty_cleanup(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) tty_port_put(tty->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) /* Traditional BSD devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) #ifdef CONFIG_LEGACY_PTYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) return pty_common_install(driver, tty, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct tty_struct *pair = tty->link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) driver->ttys[tty->index] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (pair)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) pair->driver->ttys[pair->index] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static int pty_bsd_ioctl(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return pty_set_lock(tty, (int __user *) arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) case TIOCGPTLCK: /* Get PT Lock status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return pty_get_lock(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) case TIOCPKT: /* Set PT packet mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return pty_set_pktmode(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) case TIOCGPKT: /* Get PT packet mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return pty_get_pktmode(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) case TIOCSIG: /* Send signal to other side of pty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return pty_signal(tty, (int) arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) static long pty_bsd_compat_ioctl(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * PTY ioctls don't require any special translation between 32-bit and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * 64-bit userspace, they are already compatible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return pty_bsd_ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) #define pty_bsd_compat_ioctl NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * not really modular, but the easiest way to keep compat with existing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * bootargs behaviour is to continue using module_param here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) module_param(legacy_count, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * The master side of a pty can do TIOCSPTLCK and thus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * has pty_bsd_ioctl.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) static const struct tty_operations master_pty_ops_bsd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) .install = pty_install,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) .open = pty_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) .close = pty_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) .write = pty_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) .write_room = pty_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) .flush_buffer = pty_flush_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) .chars_in_buffer = pty_chars_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) .unthrottle = pty_unthrottle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) .ioctl = pty_bsd_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) .compat_ioctl = pty_bsd_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) .cleanup = pty_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) .resize = pty_resize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) .remove = pty_remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) static const struct tty_operations slave_pty_ops_bsd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) .install = pty_install,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) .open = pty_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) .close = pty_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) .write = pty_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) .write_room = pty_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) .flush_buffer = pty_flush_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) .chars_in_buffer = pty_chars_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) .unthrottle = pty_unthrottle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .set_termios = pty_set_termios,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) .cleanup = pty_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) .resize = pty_resize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) .start = pty_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) .stop = pty_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) .remove = pty_remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) static void __init legacy_pty_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) struct tty_driver *pty_driver, *pty_slave_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (legacy_count <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) pty_driver = tty_alloc_driver(legacy_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) TTY_DRIVER_RESET_TERMIOS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) TTY_DRIVER_REAL_RAW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) TTY_DRIVER_DYNAMIC_ALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) if (IS_ERR(pty_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) panic("Couldn't allocate pty driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) pty_slave_driver = tty_alloc_driver(legacy_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) TTY_DRIVER_RESET_TERMIOS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) TTY_DRIVER_REAL_RAW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) TTY_DRIVER_DYNAMIC_ALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) if (IS_ERR(pty_slave_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) panic("Couldn't allocate pty slave driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) pty_driver->driver_name = "pty_master";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) pty_driver->name = "pty";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) pty_driver->major = PTY_MASTER_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) pty_driver->minor_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) pty_driver->type = TTY_DRIVER_TYPE_PTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) pty_driver->subtype = PTY_TYPE_MASTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) pty_driver->init_termios = tty_std_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) pty_driver->init_termios.c_iflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) pty_driver->init_termios.c_oflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) pty_driver->init_termios.c_lflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) pty_driver->init_termios.c_ispeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) pty_driver->init_termios.c_ospeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) pty_driver->other = pty_slave_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) tty_set_operations(pty_driver, &master_pty_ops_bsd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) pty_slave_driver->driver_name = "pty_slave";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) pty_slave_driver->name = "ttyp";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) pty_slave_driver->major = PTY_SLAVE_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) pty_slave_driver->minor_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) pty_slave_driver->subtype = PTY_TYPE_SLAVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) pty_slave_driver->init_termios = tty_std_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) pty_slave_driver->init_termios.c_ispeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) pty_slave_driver->init_termios.c_ospeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) pty_slave_driver->other = pty_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if (tty_register_driver(pty_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) panic("Couldn't register pty driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (tty_register_driver(pty_slave_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) panic("Couldn't register pty slave driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) static inline void legacy_pty_init(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* Unix98 devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) #ifdef CONFIG_UNIX98_PTYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) static struct cdev ptmx_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * ptm_open_peer - open the peer of a pty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * @master: the open struct file of the ptmx device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * @tty: the master of the pty being opened
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) * @flags: the flags for open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) * Provide a race free way for userspace to open the slave end of a pty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * (where they have the master fd and cannot access or trust the mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * namespace /dev/pts was mounted inside).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) int ptm_open_peer(struct file *master, struct tty_struct *tty, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) int fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) struct file *filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) int retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (tty->driver != ptm_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) fd = get_unused_fd_flags(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) retval = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) /* Compute the slave's path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) path.mnt = devpts_mntget(master, tty->driver_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (IS_ERR(path.mnt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) retval = PTR_ERR(path.mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) path.dentry = tty->link->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) filp = dentry_open(&path, flags, current_cred());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) mntput(path.mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (IS_ERR(filp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) retval = PTR_ERR(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) fd_install(fd, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) err_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) put_unused_fd(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) static int pty_unix98_ioctl(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) return pty_set_lock(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) case TIOCGPTLCK: /* Get PT Lock status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) return pty_get_lock(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) case TIOCPKT: /* Set PT packet mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) return pty_set_pktmode(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) case TIOCGPKT: /* Get PT packet mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) return pty_get_pktmode(tty, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) case TIOCGPTN: /* Get PT Number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) return put_user(tty->index, (unsigned int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) case TIOCSIG: /* Send signal to other side of pty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return pty_signal(tty, (int) arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) static long pty_unix98_compat_ioctl(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * PTY ioctls don't require any special translation between 32-bit and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) * 64-bit userspace, they are already compatible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) return pty_unix98_ioctl(tty, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) cmd == TIOCSIG ? arg : (unsigned long)compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) #define pty_unix98_compat_ioctl NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) * ptm_unix98_lookup - find a pty master
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * @driver: ptm driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * @idx: tty index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * Look up a pty master device. Called under the tty_mutex for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * This provides our locking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) struct file *file, int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) /* Master must be open via /dev/ptmx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) return ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * pts_unix98_lookup - find a pty slave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) * @driver: pts driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) * @idx: tty index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) * Look up a pty master device. Called under the tty_mutex for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) * This provides our locking for the tty pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) struct file *file, int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) struct tty_struct *tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) mutex_lock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) tty = devpts_get_priv(file->f_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) mutex_unlock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) /* Master must be open before slave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) if (!tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) return tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) return pty_common_install(driver, tty, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /* this is called once with whichever end is closed last */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) struct pts_fs_info *fsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (tty->driver->subtype == PTY_TYPE_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) fsi = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) fsi = tty->link->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) if (fsi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) devpts_kill_index(fsi, tty->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) devpts_release(fsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) seq_printf(m, "tty-index:\t%d\n", tty->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) static const struct tty_operations ptm_unix98_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) .lookup = ptm_unix98_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) .install = pty_unix98_install,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) .remove = pty_unix98_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) .open = pty_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) .close = pty_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) .write = pty_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) .write_room = pty_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) .flush_buffer = pty_flush_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) .chars_in_buffer = pty_chars_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) .unthrottle = pty_unthrottle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) .ioctl = pty_unix98_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) .compat_ioctl = pty_unix98_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) .resize = pty_resize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) .cleanup = pty_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) .show_fdinfo = pty_show_fdinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) static const struct tty_operations pty_unix98_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) .lookup = pts_unix98_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) .install = pty_unix98_install,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) .remove = pty_unix98_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) .open = pty_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) .close = pty_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) .write = pty_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) .write_room = pty_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) .flush_buffer = pty_flush_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) .chars_in_buffer = pty_chars_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) .unthrottle = pty_unthrottle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) .set_termios = pty_set_termios,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) .start = pty_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) .stop = pty_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) .cleanup = pty_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) * ptmx_open - open a unix 98 pty master
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * @inode: inode of device file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * @filp: file pointer to tty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * Allocate a unix98 pty master device from the ptmx driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * Locking: tty_mutex protects the init_dev work. tty->count should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) * protect the rest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) * allocated_ptys_lock handles the list of free pty numbers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) static int ptmx_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) struct pts_fs_info *fsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) struct tty_struct *tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) nonseekable_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) /* We refuse fsnotify events on ptmx, since it's a shared resource */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) filp->f_mode |= FMODE_NONOTIFY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) retval = tty_alloc_file(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) fsi = devpts_acquire(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) if (IS_ERR(fsi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) retval = PTR_ERR(fsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) goto out_free_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) /* find a device that is not in use. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) mutex_lock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) index = devpts_new_index(fsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) mutex_unlock(&devpts_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) retval = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (index < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) goto out_put_fsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) mutex_lock(&tty_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) tty = tty_init_dev(ptm_driver, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) /* The tty returned here is locked so we can safely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) drop the mutex */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) mutex_unlock(&tty_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) retval = PTR_ERR(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) if (IS_ERR(tty))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) * From here on out, the tty is "live", and the index and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) * fsi will be killed/put by the tty_release()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) tty->driver_data = fsi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) tty_add_file(tty, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) dentry = devpts_pty_new(fsi, index, tty->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) retval = PTR_ERR(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) goto err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) tty->link->driver_data = dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) retval = ptm_driver->ops->open(tty, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) goto err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) tty_debug_hangup(tty, "opening (count=%d)\n", tty->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) tty_unlock(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) err_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) tty_unlock(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) // This will also put-ref the fsi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) tty_release(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) devpts_kill_index(fsi, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) out_put_fsi:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) devpts_release(fsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) out_free_file:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) tty_free_file(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) static struct file_operations ptmx_fops __ro_after_init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) static void __init unix98_pty_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) TTY_DRIVER_RESET_TERMIOS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) TTY_DRIVER_REAL_RAW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) TTY_DRIVER_DYNAMIC_DEV |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) TTY_DRIVER_DEVPTS_MEM |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) TTY_DRIVER_DYNAMIC_ALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (IS_ERR(ptm_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) panic("Couldn't allocate Unix98 ptm driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) TTY_DRIVER_RESET_TERMIOS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) TTY_DRIVER_REAL_RAW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) TTY_DRIVER_DYNAMIC_DEV |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) TTY_DRIVER_DEVPTS_MEM |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) TTY_DRIVER_DYNAMIC_ALLOC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) if (IS_ERR(pts_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) panic("Couldn't allocate Unix98 pts driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) ptm_driver->driver_name = "pty_master";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) ptm_driver->name = "ptm";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) ptm_driver->minor_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) ptm_driver->type = TTY_DRIVER_TYPE_PTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) ptm_driver->subtype = PTY_TYPE_MASTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) ptm_driver->init_termios = tty_std_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) ptm_driver->init_termios.c_iflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) ptm_driver->init_termios.c_oflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) ptm_driver->init_termios.c_lflag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) ptm_driver->init_termios.c_ispeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) ptm_driver->init_termios.c_ospeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) ptm_driver->other = pts_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) tty_set_operations(ptm_driver, &ptm_unix98_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) pts_driver->driver_name = "pty_slave";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) pts_driver->name = "pts";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) pts_driver->minor_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) pts_driver->type = TTY_DRIVER_TYPE_PTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) pts_driver->subtype = PTY_TYPE_SLAVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) pts_driver->init_termios = tty_std_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) pts_driver->init_termios.c_ispeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) pts_driver->init_termios.c_ospeed = 38400;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) pts_driver->other = ptm_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) tty_set_operations(pts_driver, &pty_unix98_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (tty_register_driver(ptm_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) panic("Couldn't register Unix98 ptm driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) if (tty_register_driver(pts_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) panic("Couldn't register Unix98 pts driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) /* Now create the /dev/ptmx special device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) tty_default_fops(&ptmx_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) ptmx_fops.open = ptmx_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) cdev_init(&ptmx_cdev, &ptmx_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) panic("Couldn't register /dev/ptmx driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) static inline void unix98_pty_init(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) static int __init pty_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) legacy_pty_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) unix98_pty_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) device_initcall(pty_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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