tty_ioctl.c (2a906db2824b75444982f5e9df870106982afca8) tty_ioctl.c (1d5d66825610bb7be23e2229731261c8e99eaa28)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
4 *
5 * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
6 * which can be dynamically activated and de-activated by the line
7 * discipline handling modules (like SLIP).
8 */

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214}
215EXPORT_SYMBOL(tty_wait_until_sent);
216
217
218/*
219 * Termios Helper Methods
220 */
221
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
4 *
5 * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
6 * which can be dynamically activated and de-activated by the line
7 * discipline handling modules (like SLIP).
8 */

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214}
215EXPORT_SYMBOL(tty_wait_until_sent);
216
217
218/*
219 * Termios Helper Methods
220 */
221
222static void unset_locked_termios(struct tty_struct *tty, struct ktermios *old)
222static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *old)
223{
224 struct ktermios *termios = &tty->termios;
225 struct ktermios *locked = &tty->termios_locked;
226 int i;
227
228#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
229
230 NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);

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244 * @old: Old termios
245 *
246 * Propagate the hardware specific terminal setting bits from
247 * the old termios structure to the new one. This is used in cases
248 * where the hardware does not support reconfiguration or as a helper
249 * in some cases where only minimal reconfiguration is supported
250 */
251
223{
224 struct ktermios *termios = &tty->termios;
225 struct ktermios *locked = &tty->termios_locked;
226 int i;
227
228#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
229
230 NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);

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244 * @old: Old termios
245 *
246 * Propagate the hardware specific terminal setting bits from
247 * the old termios structure to the new one. This is used in cases
248 * where the hardware does not support reconfiguration or as a helper
249 * in some cases where only minimal reconfiguration is supported
250 */
251
252void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old)
252void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old)
253{
254 /* The bits a dumb device handles in software. Smart devices need
255 to always provide a set_termios method */
256 new->c_cflag &= HUPCL | CREAD | CLOCAL;
257 new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
258 new->c_ispeed = old->c_ispeed;
259 new->c_ospeed = old->c_ospeed;
260}

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369 ld->ops->set_termios(tty, &old_termios);
370 tty_ldisc_deref(ld);
371 }
372 up_write(&tty->termios_rwsem);
373 return 0;
374}
375EXPORT_SYMBOL_GPL(tty_set_termios);
376
253{
254 /* The bits a dumb device handles in software. Smart devices need
255 to always provide a set_termios method */
256 new->c_cflag &= HUPCL | CREAD | CLOCAL;
257 new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
258 new->c_ispeed = old->c_ispeed;
259 new->c_ospeed = old->c_ospeed;
260}

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369 ld->ops->set_termios(tty, &old_termios);
370 tty_ldisc_deref(ld);
371 }
372 up_write(&tty->termios_rwsem);
373 return 0;
374}
375EXPORT_SYMBOL_GPL(tty_set_termios);
376
377
378/*
379 * Translate a "termio" structure into a "termios". Ugh.
380 */
381__weak int user_termio_to_kernel_termios(struct ktermios *termios,
382 struct termio __user *termio)
383{
384 struct termio v;
385
386 if (copy_from_user(&v, termio, sizeof(struct termio)))
387 return -EFAULT;
388
389 termios->c_iflag = (0xffff0000 & termios->c_iflag) | v.c_iflag;
390 termios->c_oflag = (0xffff0000 & termios->c_oflag) | v.c_oflag;
391 termios->c_cflag = (0xffff0000 & termios->c_cflag) | v.c_cflag;
392 termios->c_lflag = (0xffff0000 & termios->c_lflag) | v.c_lflag;
393 termios->c_line = (0xffff0000 & termios->c_lflag) | v.c_line;
394 memcpy(termios->c_cc, v.c_cc, NCC);
395 return 0;
396}
397
398/*
399 * Translate a "termios" structure into a "termio". Ugh.
400 */
401__weak int kernel_termios_to_user_termio(struct termio __user *termio,
402 struct ktermios *termios)
403{
404 struct termio v;
405 memset(&v, 0, sizeof(struct termio));
406 v.c_iflag = termios->c_iflag;
407 v.c_oflag = termios->c_oflag;
408 v.c_cflag = termios->c_cflag;
409 v.c_lflag = termios->c_lflag;
410 v.c_line = termios->c_line;
411 memcpy(v.c_cc, termios->c_cc, NCC);
412 return copy_to_user(termio, &v, sizeof(struct termio));
413}
414
415#ifdef TCGETS2
416__weak int user_termios_to_kernel_termios(struct ktermios *k,
417 struct termios2 __user *u)
418{
419 return copy_from_user(k, u, sizeof(struct termios2));
420}
421__weak int kernel_termios_to_user_termios(struct termios2 __user *u,
422 struct ktermios *k)
423{
424 return copy_to_user(u, k, sizeof(struct termios2));
425}
426__weak int user_termios_to_kernel_termios_1(struct ktermios *k,
427 struct termios __user *u)
428{
429 return copy_from_user(k, u, sizeof(struct termios));
430}
431__weak int kernel_termios_to_user_termios_1(struct termios __user *u,
432 struct ktermios *k)
433{
434 return copy_to_user(u, k, sizeof(struct termios));
435}
436
437#else
438
439__weak int user_termios_to_kernel_termios(struct ktermios *k,
440 struct termios __user *u)
441{
442 return copy_from_user(k, u, sizeof(struct termios));
443}
444__weak int kernel_termios_to_user_termios(struct termios __user *u,
445 struct ktermios *k)
446{
447 return copy_to_user(u, k, sizeof(struct termios));
448}
449#endif /* TCGETS2 */
450
377/**
378 * set_termios - set termios values for a tty
379 * @tty: terminal device
380 * @arg: user data
381 * @opt: option information
382 *
383 * Helper function to prepare termios data and run necessary other
384 * functions before using tty_set_termios to do the actual changes.

--- 524 unchanged lines hidden --- 		451/**
452 * set_termios - set termios values for a tty
453 * @tty: terminal device
454 * @arg: user data
455 * @opt: option information
456 *
457 * Helper function to prepare termios data and run necessary other
458 * functions before using tty_set_termios to do the actual changes.

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