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Message-ID: <20070221151554.GA22466@csclub.uwaterloo.ca>
Date: Wed, 21 Feb 2007 10:15:54 -0500
From: lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To: Mockern <Mockern@...dex.ru>
Cc: linux-kernel@...r.kernel.org
Subject: Re: cat problem in tiny_tty driver (the source included)
On Wed, Feb 21, 2007 at 06:03:16PM +0300, Mockern wrote:
> I tried to check cat operations for tiny_tty driver from LDD book.
>
> What is wrong with cat operation here?
>
> Here is the output from strace cat hello > /dev/my_tty1
>
> root@...y:/home# strace cat hello > /dev/my_tty1
> execve("/bin/cat", ["cat", "hello"], [/* 12 vars */]) = 0
> brk(0) = 0x7d000
> open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/etc/ld.so.cache", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=5664, ...}) = 0
> old_mmap(NULL, 5664, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000
> close(3) = 0
> open("/lib/libm.so.6", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\250B\0\000"..., 512) = 51
> 2
> fstat64(3, {st_mode=S_IFREG|0755, st_size=480324, ...}) = 0
> old_mmap(NULL, 506412, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40020000
> mprotect(0x40093000, 35372, PROT_NONE) = 0
> old_mmap(0x40098000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x70
> 000) = 0x40098000
> close(3) = 0
> open("/lib/libcrypt.so.1", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\260\10\0"..., 512) = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=19940, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0
> x40019000
> old_mmap(NULL, 211220, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4009c000
> mprotect(0x400a1000, 190740, PROT_NONE) = 0
> old_mmap(0x400a4000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0) =
> 0x400a4000
> old_mmap(0x400a9000, 157972, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANO
> NYMOUS, -1, 0) = 0x400a9000
> close(3) = 0
> open("/lib/libc.so.6", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\330p\1\000"..., 512) = 51
> 2
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1240024, ...}) = 0
> old_mmap(NULL, 1257088, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x400d0000
> mprotect(0x401f5000, 56960, PROT_NONE) = 0
> old_mmap(0x401f8000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x12
> 0000) = 0x401f8000
> old_mmap(0x40201000, 7808, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONY
> MOUS, -1, 0) = 0x40201000
> close(3) = 0
> munmap(0x40017000, 5664) = 0
> getuid32() = 0
> getgid32() = 0
> setgid32(0) = 0
> setuid32(0) = 0
> brk(0) = 0x7d000
> brk(0x9e000) = 0x9e000
> brk(0) = 0x9e000
> open("hello", O_RDONLY) = 3
> read(3, "123456789", 8192) = 9
> write(1, "123456789", 9) = -1 EINVAL (Invalid argument)//??????????
> write(2, "cat: ", 5cat: ) = 5
> write(2, "Write Error", 11Write Error) = 11
> write(2, ": Invalid argument\n", 19: Invalid argument
> ) = 19
> close(3) = 0
> io_submit(0, 0x40200164, 0 <unfinished ... exit status 0>
> Process 1432 detached
> root@...y:/home#
>
> ------------------------------------------------------------------------------------
>
> /*
> * Tiny TTY driver
> *
> * Copyright (C) 2002-2004 Greg Kroah-Hartman (greg@...ah.com)
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License as published by
> * the Free Software Foundation, version 2 of the License.
> *
> * This driver shows how to create a minimal tty driver. It does not rely on
> * any backing hardware, but creates a timer that emulates data being received
> * from some kind of hardware.
> */
>
> #include <linux/config.h>
> #include <linux/kernel.h>
> #include <linux/errno.h>
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/wait.h>
> #include <linux/tty.h>
> #include <linux/tty_driver.h>
> #include <linux/tty_flip.h>
> #include <linux/serial.h>
> #include <asm/uaccess.h>
>
>
> #define DRIVER_VERSION "v2.0"
> #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@...ah.com>"
> #define DRIVER_DESC "Tiny TTY driver"
>
> /* Module information */
> MODULE_AUTHOR( DRIVER_AUTHOR );
> MODULE_DESCRIPTION( DRIVER_DESC );
> MODULE_LICENSE("GPL");
>
> #define DELAY_TIME HZ * 2 /* 2 seconds per character */
> #define TINY_DATA_CHARACTER 't'
>
> #define TINY_TTY_MAJOR 240 /* experimental range */
> #define TINY_TTY_MINORS 4 /* only have 4 devices */
>
> struct tiny_serial {
> struct tty_struct *tty; /* pointer to the tty for this device */
> int open_count; /* number of times this port has been opened */
> struct semaphore sem; /* locks this structure */
> struct timer_list *timer;
>
> /* for tiocmget and tiocmset functions */
> int msr; /* MSR shadow */
> int mcr; /* MCR shadow */
>
> /* for ioctl fun */
> struct serial_struct serial;
> wait_queue_head_t wait;
> struct async_icount icount;
> };
>
> static struct tiny_serial *tiny_table[TINY_TTY_MINORS]; /* initially all NULL */
>
>
> static void tiny_timer(unsigned long timer_data)
> {
> struct tiny_serial *tiny = (struct tiny_serial *)timer_data;
> struct tty_struct *tty;
> int i;
> char data[1] = {TINY_DATA_CHARACTER};
> int data_size = 1;
>
> if (!tiny)
> return;
>
> tty = tiny->tty;
>
> /* send the data to the tty layer for users to read. This doesn't
> * actually push the data through unless tty->low_latency is set */
> for (i = 0; i < data_size; ++i) {
> if (tty->flip.count >= TTY_FLIPBUF_SIZE)
> tty_flip_buffer_push(tty);
> tty_insert_flip_char(tty, data[i], TTY_NORMAL);
> }
> tty_flip_buffer_push(tty);
>
> /* resubmit the timer again */
> tiny->timer->expires = jiffies + DELAY_TIME;
> add_timer(tiny->timer);
> }
>
> static int tiny_open(struct tty_struct *tty, struct file *file)
> {
> struct tiny_serial *tiny;
> struct timer_list *timer;
> int index;
>
> /* initialize the pointer in case something fails */
> tty->driver_data = NULL;
>
> /* get the serial object associated with this tty pointer */
> index = tty->index;
> tiny = tiny_table[index];
> if (tiny == NULL) {
> /* first time accessing this device, let's create it */
> tiny = kmalloc(sizeof(*tiny), GFP_KERNEL);
> if (!tiny)
> return -ENOMEM;
>
> init_MUTEX(&tiny->sem);
> tiny->open_count = 0;
> tiny->timer = NULL;
>
> tiny_table[index] = tiny;
> }
>
> down(&tiny->sem);
>
> /* save our structure within the tty structure */
> tty->driver_data = tiny;
> tiny->tty = tty;
>
> ++tiny->open_count;
> if (tiny->open_count == 1) {
> /* this is the first time this port is opened */
> /* do any hardware initialization needed here */
>
> /* create our timer and submit it */
> if (!tiny->timer) {
> timer = kmalloc(sizeof(*timer), GFP_KERNEL);
> if (!timer) {
> up(&tiny->sem);
> return -ENOMEM;
> }
> tiny->timer = timer;
> }
> tiny->timer->data = (unsigned long )tiny;
> tiny->timer->expires = jiffies + DELAY_TIME;
> tiny->timer->function = tiny_timer;
> add_timer(tiny->timer);
> }
>
> up(&tiny->sem);
> return 0;
> }
>
> static void do_close(struct tiny_serial *tiny)
> {
> down(&tiny->sem);
>
> if (!tiny->open_count) {
> /* port was never opened */
> goto exit;
> }
>
> --tiny->open_count;
> if (tiny->open_count <= 0) {
> /* The port is being closed by the last user. */
> /* Do any hardware specific stuff here */
>
> /* shut down our timer */
> del_timer(tiny->timer);
> }
> exit:
> up(&tiny->sem);
> }
>
> static void tiny_close(struct tty_struct *tty, struct file *file)
> {
> struct tiny_serial *tiny = tty->driver_data;
>
> if (tiny)
> do_close(tiny);
> }
>
> static int tiny_write(struct tty_struct *tty, const unsigned char *buffer, int count)
> {
> struct tiny_serial *tiny = tty->driver_data;
> int i;
> int retval = -EINVAL;
Here you set retval to EINVAL.
> if (!tiny)
> return -ENODEV;
>
> down(&tiny->sem);
>
> if (!tiny->open_count)
> /* port was not opened */
> goto exit;
>
> /* fake sending the data out a hardware port by
> * writing it to the kernel debug log.
> */
> printk(KERN_DEBUG "%s - ", __FUNCTION__);
> for (i = 0; i < count; ++i)
> printk("%02x ", buffer[i]);
> printk("\n");
>
> exit:
> up(&tiny->sem);
> return retval;
Now you return it. You never changed it. No wonder cat receives
'EINVAL' as a response to its write request. This is obviously not what
you intended.
> }
>
> static int tiny_write_room(struct tty_struct *tty)
> {
> struct tiny_serial *tiny = tty->driver_data;
> int room = -EINVAL;
>
> if (!tiny)
> return -ENODEV;
>
> down(&tiny->sem);
>
> if (!tiny->open_count) {
> /* port was not opened */
> goto exit;
> }
>
> /* calculate how much room is left in the device */
> room = 255;
>
> exit:
> up(&tiny->sem);
> return room;
> }
>
> #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
>
> static void tiny_set_termios(struct tty_struct *tty, struct termios *old_termios)
> {
> unsigned int cflag;
>
> cflag = tty->termios->c_cflag;
>
> /* check that they really want us to change something */
> if (old_termios) {
> if ((cflag == old_termios->c_cflag) &&
> (RELEVANT_IFLAG(tty->termios->c_iflag) ==
> RELEVANT_IFLAG(old_termios->c_iflag))) {
> printk(KERN_DEBUG " - nothing to change...\n");
> return;
> }
> }
>
> /* get the byte size */
> switch (cflag & CSIZE) {
> case CS5:
> printk(KERN_DEBUG " - data bits = 5\n");
> break;
> case CS6:
> printk(KERN_DEBUG " - data bits = 6\n");
> break;
> case CS7:
> printk(KERN_DEBUG " - data bits = 7\n");
> break;
> default:
> case CS8:
> printk(KERN_DEBUG " - data bits = 8\n");
> break;
> }
>
> /* determine the parity */
> if (cflag & PARENB)
> if (cflag & PARODD)
> printk(KERN_DEBUG " - parity = odd\n");
> else
> printk(KERN_DEBUG " - parity = even\n");
> else
> printk(KERN_DEBUG " - parity = none\n");
>
> /* figure out the stop bits requested */
> if (cflag & CSTOPB)
> printk(KERN_DEBUG " - stop bits = 2\n");
> else
> printk(KERN_DEBUG " - stop bits = 1\n");
>
> /* figure out the hardware flow control settings */
> if (cflag & CRTSCTS)
> printk(KERN_DEBUG " - RTS/CTS is enabled\n");
> else
> printk(KERN_DEBUG " - RTS/CTS is disabled\n");
>
> /* determine software flow control */
> /* if we are implementing XON/XOFF, set the start and
> * stop character in the device */
> if (I_IXOFF(tty) || I_IXON(tty)) {
> unsigned char stop_char = STOP_CHAR(tty);
> unsigned char start_char = START_CHAR(tty);
>
> /* if we are implementing INBOUND XON/XOFF */
> if (I_IXOFF(tty))
> printk(KERN_DEBUG " - INBOUND XON/XOFF is enabled, "
> "XON = %2x, XOFF = %2x", start_char, stop_char);
> else
> printk(KERN_DEBUG" - INBOUND XON/XOFF is disabled");
>
> /* if we are implementing OUTBOUND XON/XOFF */
> if (I_IXON(tty))
> printk(KERN_DEBUG" - OUTBOUND XON/XOFF is enabled, "
> "XON = %2x, XOFF = %2x", start_char, stop_char);
> else
> printk(KERN_DEBUG" - OUTBOUND XON/XOFF is disabled");
> }
>
> /* get the baud rate wanted */
> printk(KERN_DEBUG " - baud rate = %d", tty_get_baud_rate(tty));
> }
>
> /* Our fake UART values */
> #define MCR_DTR 0x01
> #define MCR_RTS 0x02
> #define MCR_LOOP 0x04
> #define MSR_CTS 0x08
> #define MSR_CD 0x10
> #define MSR_RI 0x20
> #define MSR_DSR 0x40
>
> static int tiny_tiocmget(struct tty_struct *tty, struct file *file)
> {
> struct tiny_serial *tiny = tty->driver_data;
>
> unsigned int result = 0;
> unsigned int msr = tiny->msr;
> unsigned int mcr = tiny->mcr;
>
> result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | /* DTR is set */
> ((mcr & MCR_RTS) ? TIOCM_RTS : 0) | /* RTS is set */
> ((mcr & MCR_LOOP) ? TIOCM_LOOP : 0) | /* LOOP is set */
> ((msr & MSR_CTS) ? TIOCM_CTS : 0) | /* CTS is set */
> ((msr & MSR_CD) ? TIOCM_CAR : 0) | /* Carrier detect is set*/
> ((msr & MSR_RI) ? TIOCM_RI : 0) | /* Ring Indicator is set */
> ((msr & MSR_DSR) ? TIOCM_DSR : 0); /* DSR is set */
>
> return result;
> }
>
> static int tiny_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear)
> {
> struct tiny_serial *tiny = tty->driver_data;
> unsigned int mcr = tiny->mcr;
>
> if (set & TIOCM_RTS)
> mcr |= MCR_RTS;
> if (set & TIOCM_DTR)
> mcr |= MCR_RTS;
>
> if (clear & TIOCM_RTS)
> mcr &= ~MCR_RTS;
> if (clear & TIOCM_DTR)
> mcr &= ~MCR_RTS;
>
> /* set the new MCR value in the device */
> tiny->mcr = mcr;
> return 0;
> }
>
> static int tiny_read_proc(char *page, char **start, off_t off, int count,
> int *eof, void *data)
> {
> struct tiny_serial *tiny;
> off_t begin = 0;
> int length = 0;
> int i;
>
> length += sprintf(page, "tinyserinfo:1.0 driver:%s\n", DRIVER_VERSION);
> for (i = 0; i < TINY_TTY_MINORS && length < PAGE_SIZE; ++i) {
> tiny = tiny_table[i];
> if (tiny == NULL)
> continue;
>
> length += sprintf(page+length, "%d\n", i);
> if ((length + begin) > (off + count))
> goto done;
> if ((length + begin) < off) {
> begin += length;
> length = 0;
> }
> }
> *eof = 1;
> done:
> if (off >= (length + begin))
> return 0;
> *start = page + (off-begin);
> return (count < begin+length-off) ? count : begin + length-off;
> }
>
> #define tiny_ioctl tiny_ioctl_tiocgserial
> static int tiny_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
> {
> struct tiny_serial *tiny = tty->driver_data;
>
> if (cmd == TIOCGSERIAL) {
> struct serial_struct tmp;
>
> if (!arg)
> return -EFAULT;
>
> memset(&tmp, 0, sizeof(tmp));
>
> tmp.type = tiny->serial.type;
> tmp.line = tiny->serial.line;
> tmp.port = tiny->serial.port;
> tmp.irq = tiny->serial.irq;
> tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
> tmp.xmit_fifo_size = tiny->serial.xmit_fifo_size;
> tmp.baud_base = tiny->serial.baud_base;
> tmp.close_delay = 5*HZ;
> tmp.closing_wait = 30*HZ;
> tmp.custom_divisor = tiny->serial.custom_divisor;
> tmp.hub6 = tiny->serial.hub6;
> tmp.io_type = tiny->serial.io_type;
>
> if (copy_to_user((void __user *)arg, &tmp, sizeof(struct serial_struct)))
> return -EFAULT;
> return 0;
> }
> return -ENOIOCTLCMD;
> }
> #undef tiny_ioctl
>
> #define tiny_ioctl tiny_ioctl_tiocmiwait
> static int tiny_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
> {
> struct tiny_serial *tiny = tty->driver_data;
>
> if (cmd == TIOCMIWAIT) {
> DECLARE_WAITQUEUE(wait, current);
> struct async_icount cnow;
> struct async_icount cprev;
>
> cprev = tiny->icount;
> while (1) {
> add_wait_queue(&tiny->wait, &wait);
> set_current_state(TASK_INTERRUPTIBLE);
> schedule();
> remove_wait_queue(&tiny->wait, &wait);
>
> /* see if a signal woke us up */
> if (signal_pending(current))
> return -ERESTARTSYS;
>
> cnow = tiny->icount;
> if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
> cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
> return -EIO; /* no change => error */
> if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
> ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
> ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
> ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
> return 0;
> }
> cprev = cnow;
> }
>
> }
> return -ENOIOCTLCMD;
> }
> #undef tiny_ioctl
>
> #define tiny_ioctl tiny_ioctl_tiocgicount
> static int tiny_ioctl(struct tty_struct *tty, struct file *file,
> unsigned int cmd, unsigned long arg)
> {
> struct tiny_serial *tiny = tty->driver_data;
>
> if (cmd == TIOCGICOUNT) {
> struct async_icount cnow = tiny->icount;
> struct serial_icounter_struct icount;
>
> icount.cts = cnow.cts;
> icount.dsr = cnow.dsr;
> icount.rng = cnow.rng;
> icount.dcd = cnow.dcd;
> icount.rx = cnow.rx;
> icount.tx = cnow.tx;
> icount.frame = cnow.frame;
> icount.overrun = cnow.overrun;
> icount.parity = cnow.parity;
> icount.brk = cnow.brk;
> icount.buf_overrun = cnow.buf_overrun;
>
> if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
> return -EFAULT;
> return 0;
> }
> return -ENOIOCTLCMD;
> }
> #undef tiny_ioctl
>
> /* the real tiny_ioctl function. The above is done to get the small functions in the book */
> static int tiny_ioctl(struct tty_struct *tty, struct file *file,
> unsigned int cmd, unsigned long arg)
> {
> switch (cmd) {
> case TIOCGSERIAL:
> return tiny_ioctl_tiocgserial(tty, file, cmd, arg);
> case TIOCMIWAIT:
> return tiny_ioctl_tiocmiwait(tty, file, cmd, arg);
> case TIOCGICOUNT:
> return tiny_ioctl_tiocgicount(tty, file, cmd, arg);
> }
>
> return -ENOIOCTLCMD;
> }
>
> static struct tty_operations serial_ops = {
> .open = tiny_open,
> .close = tiny_close,
> .write = tiny_write,
> .write_room = tiny_write_room,
> .set_termios = tiny_set_termios,
> };
>
> static struct tty_driver *tiny_tty_driver;
>
> static int __init tiny_init(void)
> {
> int retval;
> int i;
>
> /* allocate the tty driver */
> tiny_tty_driver = alloc_tty_driver(TINY_TTY_MINORS);
> if (!tiny_tty_driver)
> return -ENOMEM;
>
> /* initialize the tty driver */
> tiny_tty_driver->owner = THIS_MODULE;
> tiny_tty_driver->driver_name = "tiny_tty";
> tiny_tty_driver->name = "ttty";
> tiny_tty_driver->devfs_name = "tts/ttty%d";
> tiny_tty_driver->major = TINY_TTY_MAJOR,
> tiny_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
> tiny_tty_driver->subtype = SERIAL_TYPE_NORMAL,
> tiny_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS,
> tiny_tty_driver->init_termios = tty_std_termios;
> tiny_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
> tty_set_operations(tiny_tty_driver, &serial_ops);
>
> /* hack to make the book purty, yet still use these functions in the
> * real driver. They really should be set up in the serial_ops
> * structure above... */
> tiny_tty_driver->read_proc = tiny_read_proc;
> tiny_tty_driver->tiocmget = tiny_tiocmget;
> tiny_tty_driver->tiocmset = tiny_tiocmset;
> tiny_tty_driver->ioctl = tiny_ioctl;
>
> /* register the tty driver */
> retval = tty_register_driver(tiny_tty_driver);
> if (retval) {
> printk(KERN_ERR "failed to register tiny tty driver");
> put_tty_driver(tiny_tty_driver);
> return retval;
> }
>
> for (i = 0; i < TINY_TTY_MINORS; ++i)
> tty_register_device(tiny_tty_driver, i, NULL);
>
> printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION);
> return retval;
> }
>
> static void __exit tiny_exit(void)
> {
> struct tiny_serial *tiny;
> int i;
>
> for (i = 0; i < TINY_TTY_MINORS; ++i)
> tty_unregister_device(tiny_tty_driver, i);
> tty_unregister_driver(tiny_tty_driver);
>
> /* shut down all of the timers and free the memory */
> for (i = 0; i < TINY_TTY_MINORS; ++i) {
> tiny = tiny_table[i];
> if (tiny) {
> /* close the port */
> while (tiny->open_count)
> do_close(tiny);
>
> /* shut down our timer and free the memory */
> del_timer(tiny->timer);
> kfree(tiny->timer);
> kfree(tiny);
> tiny_table[i] = NULL;
> }
> }
> }
>
> module_init(tiny_init);
> module_exit(tiny_exit);
--
Len Sorensen
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