| /* |
| * linux/drivers/char/pty.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * Added support for a Unix98-style ptmx device. |
| * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998 |
| * |
| * When reading this code see also fs/devpts. In particular note that the |
| * driver_data field is used by the devpts side as a binding to the devpts |
| * inode. |
| */ |
| |
| #include <linux/module.h> |
| |
| #include <linux/errno.h> |
| #include <linux/interrupt.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| #include <linux/fcntl.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/major.h> |
| #include <linux/mm.h> |
| #include <linux/init.h> |
| #include <linux/smp_lock.h> |
| #include <linux/sysctl.h> |
| #include <linux/device.h> |
| #include <linux/uaccess.h> |
| #include <linux/bitops.h> |
| #include <linux/devpts_fs.h> |
| #include <linux/slab.h> |
| |
| #include <asm/system.h> |
| |
| #ifdef CONFIG_UNIX98_PTYS |
| static struct tty_driver *ptm_driver; |
| static struct tty_driver *pts_driver; |
| #endif |
| |
| static void pty_close(struct tty_struct *tty, struct file *filp) |
| { |
| BUG_ON(!tty); |
| if (tty->driver->subtype == PTY_TYPE_MASTER) |
| WARN_ON(tty->count > 1); |
| else { |
| if (tty->count > 2) |
| return; |
| } |
| wake_up_interruptible(&tty->read_wait); |
| wake_up_interruptible(&tty->write_wait); |
| tty->packet = 0; |
| if (!tty->link) |
| return; |
| tty->link->packet = 0; |
| set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| wake_up_interruptible(&tty->link->read_wait); |
| wake_up_interruptible(&tty->link->write_wait); |
| if (tty->driver->subtype == PTY_TYPE_MASTER) { |
| set_bit(TTY_OTHER_CLOSED, &tty->flags); |
| #ifdef CONFIG_UNIX98_PTYS |
| if (tty->driver == ptm_driver) |
| devpts_pty_kill(tty->link); |
| #endif |
| tty_vhangup(tty->link); |
| } |
| } |
| |
| /* |
| * The unthrottle routine is called by the line discipline to signal |
| * that it can receive more characters. For PTY's, the TTY_THROTTLED |
| * flag is always set, to force the line discipline to always call the |
| * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
| * characters in the queue. This is necessary since each time this |
| * happens, we need to wake up any sleeping processes that could be |
| * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() |
| * for the pty buffer to be drained. |
| */ |
| static void pty_unthrottle(struct tty_struct *tty) |
| { |
| tty_wakeup(tty->link); |
| set_bit(TTY_THROTTLED, &tty->flags); |
| } |
| |
| /** |
| * pty_space - report space left for writing |
| * @to: tty we are writing into |
| * |
| * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
| * allows a lot of overspill room for echo and other fun messes to |
| * be handled properly |
| */ |
| |
| static int pty_space(struct tty_struct *to) |
| { |
| int n = 8192 - to->buf.memory_used; |
| if (n < 0) |
| return 0; |
| return n; |
| } |
| |
| /** |
| * pty_write - write to a pty |
| * @tty: the tty we write from |
| * @buf: kernel buffer of data |
| * @count: bytes to write |
| * |
| * Our "hardware" write method. Data is coming from the ldisc which |
| * may be in a non sleeping state. We simply throw this at the other |
| * end of the link as if we were an IRQ handler receiving stuff for |
| * the other side of the pty/tty pair. |
| */ |
| |
| static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
| { |
| struct tty_struct *to = tty->link; |
| |
| if (tty->stopped) |
| return 0; |
| |
| if (c > 0) { |
| /* Stuff the data into the input queue of the other end */ |
| c = tty_insert_flip_string(to, buf, c); |
| /* And shovel */ |
| if (c) { |
| tty_flip_buffer_push(to); |
| tty_wakeup(tty); |
| } |
| } |
| return c; |
| } |
| |
| /** |
| * pty_write_room - write space |
| * @tty: tty we are writing from |
| * |
| * Report how many bytes the ldisc can send into the queue for |
| * the other device. |
| */ |
| |
| static int pty_write_room(struct tty_struct *tty) |
| { |
| if (tty->stopped) |
| return 0; |
| return pty_space(tty->link); |
| } |
| |
| /** |
| * pty_chars_in_buffer - characters currently in our tx queue |
| * @tty: our tty |
| * |
| * Report how much we have in the transmit queue. As everything is |
| * instantly at the other end this is easy to implement. |
| */ |
| |
| static int pty_chars_in_buffer(struct tty_struct *tty) |
| { |
| return 0; |
| } |
| |
| /* Set the lock flag on a pty */ |
| static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
| { |
| int val; |
| if (get_user(val, arg)) |
| return -EFAULT; |
| if (val) |
| set_bit(TTY_PTY_LOCK, &tty->flags); |
| else |
| clear_bit(TTY_PTY_LOCK, &tty->flags); |
| return 0; |
| } |
| |
| /* Send a signal to the slave */ |
| static int pty_signal(struct tty_struct *tty, int sig) |
| { |
| unsigned long flags; |
| struct pid *pgrp; |
| |
| if (tty->link) { |
| spin_lock_irqsave(&tty->link->ctrl_lock, flags); |
| pgrp = get_pid(tty->link->pgrp); |
| spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); |
| |
| kill_pgrp(pgrp, sig, 1); |
| put_pid(pgrp); |
| } |
| return 0; |
| } |
| |
| static void pty_flush_buffer(struct tty_struct *tty) |
| { |
| struct tty_struct *to = tty->link; |
| unsigned long flags; |
| |
| if (!to) |
| return; |
| /* tty_buffer_flush(to); FIXME */ |
| if (to->packet) { |
| spin_lock_irqsave(&tty->ctrl_lock, flags); |
| tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
| wake_up_interruptible(&to->read_wait); |
| spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| } |
| } |
| |
| static int pty_open(struct tty_struct *tty, struct file *filp) |
| { |
| int retval = -ENODEV; |
| |
| if (!tty || !tty->link) |
| goto out; |
| |
| retval = -EIO; |
| if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
| goto out; |
| if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) |
| goto out; |
| if (tty->link->count != 1) |
| goto out; |
| |
| clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| set_bit(TTY_THROTTLED, &tty->flags); |
| retval = 0; |
| out: |
| return retval; |
| } |
| |
| static void pty_set_termios(struct tty_struct *tty, |
| struct ktermios *old_termios) |
| { |
| tty->termios->c_cflag &= ~(CSIZE | PARENB); |
| tty->termios->c_cflag |= (CS8 | CREAD); |
| } |
| |
| /** |
| * pty_do_resize - resize event |
| * @tty: tty being resized |
| * @ws: window size being set. |
| * |
| * Update the termios variables and send the necessary signals to |
| * peform a terminal resize correctly |
| */ |
| |
| int pty_resize(struct tty_struct *tty, struct winsize *ws) |
| { |
| struct pid *pgrp, *rpgrp; |
| unsigned long flags; |
| struct tty_struct *pty = tty->link; |
| |
| /* For a PTY we need to lock the tty side */ |
| mutex_lock(&tty->termios_mutex); |
| if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
| goto done; |
| |
| /* Get the PID values and reference them so we can |
| avoid holding the tty ctrl lock while sending signals. |
| We need to lock these individually however. */ |
| |
| spin_lock_irqsave(&tty->ctrl_lock, flags); |
| pgrp = get_pid(tty->pgrp); |
| spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| |
| spin_lock_irqsave(&pty->ctrl_lock, flags); |
| rpgrp = get_pid(pty->pgrp); |
| spin_unlock_irqrestore(&pty->ctrl_lock, flags); |
| |
| if (pgrp) |
| kill_pgrp(pgrp, SIGWINCH, 1); |
| if (rpgrp != pgrp && rpgrp) |
| kill_pgrp(rpgrp, SIGWINCH, 1); |
| |
| put_pid(pgrp); |
| put_pid(rpgrp); |
| |
| tty->winsize = *ws; |
| pty->winsize = *ws; /* Never used so will go away soon */ |
| done: |
| mutex_unlock(&tty->termios_mutex); |
| return 0; |
| } |
| |
| /* Traditional BSD devices */ |
| #ifdef CONFIG_LEGACY_PTYS |
| |
| static int pty_install(struct tty_driver *driver, struct tty_struct *tty) |
| { |
| struct tty_struct *o_tty; |
| int idx = tty->index; |
| int retval; |
| |
| o_tty = alloc_tty_struct(); |
| if (!o_tty) |
| return -ENOMEM; |
| if (!try_module_get(driver->other->owner)) { |
| /* This cannot in fact currently happen */ |
| free_tty_struct(o_tty); |
| return -ENOMEM; |
| } |
| initialize_tty_struct(o_tty, driver->other, idx); |
| |
| /* We always use new tty termios data so we can do this |
| the easy way .. */ |
| retval = tty_init_termios(tty); |
| if (retval) |
| goto free_mem_out; |
| |
| retval = tty_init_termios(o_tty); |
| if (retval) { |
| tty_free_termios(tty); |
| goto free_mem_out; |
| } |
| |
| /* |
| * Everything allocated ... set up the o_tty structure. |
| */ |
| driver->other->ttys[idx] = o_tty; |
| tty_driver_kref_get(driver->other); |
| if (driver->subtype == PTY_TYPE_MASTER) |
| o_tty->count++; |
| /* Establish the links in both directions */ |
| tty->link = o_tty; |
| o_tty->link = tty; |
| |
| tty_driver_kref_get(driver); |
| tty->count++; |
| driver->ttys[idx] = tty; |
| return 0; |
| free_mem_out: |
| module_put(o_tty->driver->owner); |
| free_tty_struct(o_tty); |
| return -ENOMEM; |
| } |
| |
| static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| return pty_set_lock(tty, (int __user *) arg); |
| case TIOCSIG: /* Send signal to other side of pty */ |
| return pty_signal(tty, (int) arg); |
| } |
| return -ENOIOCTLCMD; |
| } |
| |
| static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
| module_param(legacy_count, int, 0); |
| |
| /* |
| * The master side of a pty can do TIOCSPTLCK and thus |
| * has pty_bsd_ioctl. |
| */ |
| static const struct tty_operations master_pty_ops_bsd = { |
| .install = pty_install, |
| .open = pty_open, |
| .close = pty_close, |
| .write = pty_write, |
| .write_room = pty_write_room, |
| .flush_buffer = pty_flush_buffer, |
| .chars_in_buffer = pty_chars_in_buffer, |
| .unthrottle = pty_unthrottle, |
| .set_termios = pty_set_termios, |
| .ioctl = pty_bsd_ioctl, |
| .resize = pty_resize |
| }; |
| |
| static const struct tty_operations slave_pty_ops_bsd = { |
| .install = pty_install, |
| .open = pty_open, |
| .close = pty_close, |
| .write = pty_write, |
| .write_room = pty_write_room, |
| .flush_buffer = pty_flush_buffer, |
| .chars_in_buffer = pty_chars_in_buffer, |
| .unthrottle = pty_unthrottle, |
| .set_termios = pty_set_termios, |
| .resize = pty_resize |
| }; |
| |
| static void __init legacy_pty_init(void) |
| { |
| struct tty_driver *pty_driver, *pty_slave_driver; |
| |
| if (legacy_count <= 0) |
| return; |
| |
| pty_driver = alloc_tty_driver(legacy_count); |
| if (!pty_driver) |
| panic("Couldn't allocate pty driver"); |
| |
| pty_slave_driver = alloc_tty_driver(legacy_count); |
| if (!pty_slave_driver) |
| panic("Couldn't allocate pty slave driver"); |
| |
| pty_driver->owner = THIS_MODULE; |
| pty_driver->driver_name = "pty_master"; |
| pty_driver->name = "pty"; |
| pty_driver->major = PTY_MASTER_MAJOR; |
| pty_driver->minor_start = 0; |
| pty_driver->type = TTY_DRIVER_TYPE_PTY; |
| pty_driver->subtype = PTY_TYPE_MASTER; |
| pty_driver->init_termios = tty_std_termios; |
| pty_driver->init_termios.c_iflag = 0; |
| pty_driver->init_termios.c_oflag = 0; |
| pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| pty_driver->init_termios.c_lflag = 0; |
| pty_driver->init_termios.c_ispeed = 38400; |
| pty_driver->init_termios.c_ospeed = 38400; |
| pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW; |
| pty_driver->other = pty_slave_driver; |
| tty_set_operations(pty_driver, &master_pty_ops_bsd); |
| |
| pty_slave_driver->owner = THIS_MODULE; |
| pty_slave_driver->driver_name = "pty_slave"; |
| pty_slave_driver->name = "ttyp"; |
| pty_slave_driver->major = PTY_SLAVE_MAJOR; |
| pty_slave_driver->minor_start = 0; |
| pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; |
| pty_slave_driver->subtype = PTY_TYPE_SLAVE; |
| pty_slave_driver->init_termios = tty_std_termios; |
| pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| pty_slave_driver->init_termios.c_ispeed = 38400; |
| pty_slave_driver->init_termios.c_ospeed = 38400; |
| pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS | |
| TTY_DRIVER_REAL_RAW; |
| pty_slave_driver->other = pty_driver; |
| tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
| |
| if (tty_register_driver(pty_driver)) |
| panic("Couldn't register pty driver"); |
| if (tty_register_driver(pty_slave_driver)) |
| panic("Couldn't register pty slave driver"); |
| } |
| #else |
| static inline void legacy_pty_init(void) { } |
| #endif |
| |
| /* Unix98 devices */ |
| #ifdef CONFIG_UNIX98_PTYS |
| /* |
| * sysctl support for setting limits on the number of Unix98 ptys allocated. |
| * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly. |
| */ |
| int pty_limit = NR_UNIX98_PTY_DEFAULT; |
| static int pty_limit_min; |
| static int pty_limit_max = NR_UNIX98_PTY_MAX; |
| static int pty_count; |
| |
| static struct cdev ptmx_cdev; |
| |
| static struct ctl_table pty_table[] = { |
| { |
| .procname = "max", |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .data = &pty_limit, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &pty_limit_min, |
| .extra2 = &pty_limit_max, |
| }, { |
| .procname = "nr", |
| .maxlen = sizeof(int), |
| .mode = 0444, |
| .data = &pty_count, |
| .proc_handler = proc_dointvec, |
| }, |
| {} |
| }; |
| |
| static struct ctl_table pty_kern_table[] = { |
| { |
| .procname = "pty", |
| .mode = 0555, |
| .child = pty_table, |
| }, |
| {} |
| }; |
| |
| static struct ctl_table pty_root_table[] = { |
| { |
| .procname = "kernel", |
| .mode = 0555, |
| .child = pty_kern_table, |
| }, |
| {} |
| }; |
| |
| |
| static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| return pty_set_lock(tty, (int __user *)arg); |
| case TIOCGPTN: /* Get PT Number */ |
| return put_user(tty->index, (unsigned int __user *)arg); |
| case TIOCSIG: /* Send signal to other side of pty */ |
| return pty_signal(tty, (int) arg); |
| } |
| |
| return -ENOIOCTLCMD; |
| } |
| |
| /** |
| * ptm_unix98_lookup - find a pty master |
| * @driver: ptm driver |
| * @idx: tty index |
| * |
| * Look up a pty master device. Called under the tty_mutex for now. |
| * This provides our locking. |
| */ |
| |
| static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
| struct inode *ptm_inode, int idx) |
| { |
| struct tty_struct *tty = devpts_get_tty(ptm_inode, idx); |
| if (tty) |
| tty = tty->link; |
| return tty; |
| } |
| |
| /** |
| * pts_unix98_lookup - find a pty slave |
| * @driver: pts driver |
| * @idx: tty index |
| * |
| * Look up a pty master device. Called under the tty_mutex for now. |
| * This provides our locking. |
| */ |
| |
| static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
| struct inode *pts_inode, int idx) |
| { |
| struct tty_struct *tty = devpts_get_tty(pts_inode, idx); |
| /* Master must be open before slave */ |
| if (!tty) |
| return ERR_PTR(-EIO); |
| return tty; |
| } |
| |
| static void pty_unix98_shutdown(struct tty_struct *tty) |
| { |
| /* We have our own method as we don't use the tty index */ |
| kfree(tty->termios); |
| } |
| |
| /* We have no need to install and remove our tty objects as devpts does all |
| the work for us */ |
| |
| static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
| { |
| struct tty_struct *o_tty; |
| int idx = tty->index; |
| |
| o_tty = alloc_tty_struct(); |
| if (!o_tty) |
| return -ENOMEM; |
| if (!try_module_get(driver->other->owner)) { |
| /* This cannot in fact currently happen */ |
| free_tty_struct(o_tty); |
| return -ENOMEM; |
| } |
| initialize_tty_struct(o_tty, driver->other, idx); |
| |
| tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); |
| if (tty->termios == NULL) |
| goto free_mem_out; |
| *tty->termios = driver->init_termios; |
| tty->termios_locked = tty->termios + 1; |
| |
| o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); |
| if (o_tty->termios == NULL) |
| goto free_mem_out; |
| *o_tty->termios = driver->other->init_termios; |
| o_tty->termios_locked = o_tty->termios + 1; |
| |
| tty_driver_kref_get(driver->other); |
| if (driver->subtype == PTY_TYPE_MASTER) |
| o_tty->count++; |
| /* Establish the links in both directions */ |
| tty->link = o_tty; |
| o_tty->link = tty; |
| /* |
| * All structures have been allocated, so now we install them. |
| * Failures after this point use release_tty to clean up, so |
| * there's no need to null out the local pointers. |
| */ |
| tty_driver_kref_get(driver); |
| tty->count++; |
| pty_count++; |
| return 0; |
| free_mem_out: |
| kfree(o_tty->termios); |
| module_put(o_tty->driver->owner); |
| free_tty_struct(o_tty); |
| kfree(tty->termios); |
| return -ENOMEM; |
| } |
| |
| static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
| { |
| pty_count--; |
| } |
| |
| static const struct tty_operations ptm_unix98_ops = { |
| .lookup = ptm_unix98_lookup, |
| .install = pty_unix98_install, |
| .remove = pty_unix98_remove, |
| .open = pty_open, |
| .close = pty_close, |
| .write = pty_write, |
| .write_room = pty_write_room, |
| .flush_buffer = pty_flush_buffer, |
| .chars_in_buffer = pty_chars_in_buffer, |
| .unthrottle = pty_unthrottle, |
| .set_termios = pty_set_termios, |
| .ioctl = pty_unix98_ioctl, |
| .shutdown = pty_unix98_shutdown, |
| .resize = pty_resize |
| }; |
| |
| static const struct tty_operations pty_unix98_ops = { |
| .lookup = pts_unix98_lookup, |
| .install = pty_unix98_install, |
| .remove = pty_unix98_remove, |
| .open = pty_open, |
| .close = pty_close, |
| .write = pty_write, |
| .write_room = pty_write_room, |
| .flush_buffer = pty_flush_buffer, |
| .chars_in_buffer = pty_chars_in_buffer, |
| .unthrottle = pty_unthrottle, |
| .set_termios = pty_set_termios, |
| .shutdown = pty_unix98_shutdown |
| }; |
| |
| /** |
| * ptmx_open - open a unix 98 pty master |
| * @inode: inode of device file |
| * @filp: file pointer to tty |
| * |
| * Allocate a unix98 pty master device from the ptmx driver. |
| * |
| * Locking: tty_mutex protects the init_dev work. tty->count should |
| * protect the rest. |
| * allocated_ptys_lock handles the list of free pty numbers |
| */ |
| |
| static int ptmx_open(struct inode *inode, struct file *filp) |
| { |
| struct tty_struct *tty; |
| int retval; |
| int index; |
| |
| nonseekable_open(inode, filp); |
| |
| /* find a device that is not in use. */ |
| tty_lock(); |
| index = devpts_new_index(inode); |
| tty_unlock(); |
| if (index < 0) |
| return index; |
| |
| mutex_lock(&tty_mutex); |
| tty_lock(); |
| tty = tty_init_dev(ptm_driver, index, 1); |
| mutex_unlock(&tty_mutex); |
| |
| if (IS_ERR(tty)) { |
| retval = PTR_ERR(tty); |
| goto out; |
| } |
| |
| set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
| filp->private_data = tty; |
| file_move(filp, &tty->tty_files); |
| |
| retval = devpts_pty_new(inode, tty->link); |
| if (retval) |
| goto out1; |
| |
| retval = ptm_driver->ops->open(tty, filp); |
| if (retval) |
| goto out2; |
| out1: |
| tty_unlock(); |
| return retval; |
| out2: |
| tty_unlock(); |
| tty_release(inode, filp); |
| return retval; |
| out: |
| devpts_kill_index(inode, index); |
| tty_unlock(); |
| return retval; |
| } |
| |
| static struct file_operations ptmx_fops; |
| |
| static void __init unix98_pty_init(void) |
| { |
| ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); |
| if (!ptm_driver) |
| panic("Couldn't allocate Unix98 ptm driver"); |
| pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); |
| if (!pts_driver) |
| panic("Couldn't allocate Unix98 pts driver"); |
| |
| ptm_driver->owner = THIS_MODULE; |
| ptm_driver->driver_name = "pty_master"; |
| ptm_driver->name = "ptm"; |
| ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; |
| ptm_driver->minor_start = 0; |
| ptm_driver->type = TTY_DRIVER_TYPE_PTY; |
| ptm_driver->subtype = PTY_TYPE_MASTER; |
| ptm_driver->init_termios = tty_std_termios; |
| ptm_driver->init_termios.c_iflag = 0; |
| ptm_driver->init_termios.c_oflag = 0; |
| ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| ptm_driver->init_termios.c_lflag = 0; |
| ptm_driver->init_termios.c_ispeed = 38400; |
| ptm_driver->init_termios.c_ospeed = 38400; |
| ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
| TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
| ptm_driver->other = pts_driver; |
| tty_set_operations(ptm_driver, &ptm_unix98_ops); |
| |
| pts_driver->owner = THIS_MODULE; |
| pts_driver->driver_name = "pty_slave"; |
| pts_driver->name = "pts"; |
| pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; |
| pts_driver->minor_start = 0; |
| pts_driver->type = TTY_DRIVER_TYPE_PTY; |
| pts_driver->subtype = PTY_TYPE_SLAVE; |
| pts_driver->init_termios = tty_std_termios; |
| pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| pts_driver->init_termios.c_ispeed = 38400; |
| pts_driver->init_termios.c_ospeed = 38400; |
| pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
| TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
| pts_driver->other = ptm_driver; |
| tty_set_operations(pts_driver, &pty_unix98_ops); |
| |
| if (tty_register_driver(ptm_driver)) |
| panic("Couldn't register Unix98 ptm driver"); |
| if (tty_register_driver(pts_driver)) |
| panic("Couldn't register Unix98 pts driver"); |
| |
| register_sysctl_table(pty_root_table); |
| |
| /* Now create the /dev/ptmx special device */ |
| tty_default_fops(&ptmx_fops); |
| ptmx_fops.open = ptmx_open; |
| |
| cdev_init(&ptmx_cdev, &ptmx_fops); |
| if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || |
| register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) |
| panic("Couldn't register /dev/ptmx driver\n"); |
| device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
| } |
| |
| #else |
| static inline void unix98_pty_init(void) { } |
| #endif |
| |
| static int __init pty_init(void) |
| { |
| legacy_pty_init(); |
| unix98_pty_init(); |
| return 0; |
| } |
| module_init(pty_init); |