diff --git b/AUTHORS a/AUTHORS new file mode 100644 index 0000000..359d0ba --- /dev/null +++ a/AUTHORS @@ -0,0 +1 @@ +Luis Claudio Gamboa Lopes diff --git b/COPYING a/COPYING new file mode 100644 index 0000000..d60c31a --- /dev/null +++ a/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Library General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + 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; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git b/INSTALL a/INSTALL new file mode 100644 index 0000000..b6d5129 --- /dev/null +++ a/INSTALL @@ -0,0 +1,19 @@ +Installation: + +pts: + make -To compile + ./tty0tty -To run + + +module: + make -To compile + insmod tty0tty.ko -To load module (using root or sudo) + + +this version is not installable + + +Requirements: + + for module build is necessary kernel-headers or kernel source + ( in debian use apt-get install linux-image-2.6.26-2-amd64 for example) diff --git b/README a/README new file mode 100644 index 0000000..8c1a817 --- /dev/null +++ a/README @@ -0,0 +1,51 @@ +tty0tty - linux null modem emulator +Forked to instance on github since original project is dead. + + +This is the tty0tty directory tree: + + module - linux kernel module null-modem + pts - null-modem using ptys (without handshake lines) + + +pts: + + When run connect two pseudo-ttys and show the connection names: + + (/dev/pts/1) <=> (/dev/pts/2) + + the connection is: + + TX -> RX + RX <- TX + + + +module: + + The module is tested in kernel 2.6.26-2 (debian) and kernel 2.6.30 + + When loaded, create 8 ttys interconnected: + /dev/tnt0 <=> /dev/tnt1 + /dev/tnt2 <=> /dev/tnt3 + /dev/tnt4 <=> /dev/tnt5 + /dev/tnt6 <=> /dev/tnt7 + + the connection is: + + TX -> RX + RX <- TX + RTS -> CTS + CTS <- RTS + DSR <- DTR + CD <- DTR + DTR -> DSR + DTR -> CD + + +Requirements: + + for module build is necessary kernel-headers or kernel source + ( in debian use apt-get install linux-image-2.6.26-2-amd64 for example) + + diff --git b/THANKS a/THANKS new file mode 100644 index 0000000..e362312 --- /dev/null +++ a/THANKS @@ -0,0 +1,4 @@ +Special Thanks: + +* Jesus + for my life diff --git b/TODO a/TODO new file mode 100644 index 0000000..e69de29 --- /dev/null +++ a/TODO diff --git b/VERSION a/VERSION new file mode 100644 index 0000000..7fc8c48 --- /dev/null +++ a/VERSION @@ -0,0 +1,4 @@ +PACKAGE=tty0tty +MAINVER=1 +MINORVER=0 +VERSION=1.0 diff --git b/module/Makefile a/module/Makefile new file mode 100644 index 0000000..4962260 --- /dev/null +++ a/module/Makefile @@ -0,0 +1,41 @@ +# Comment/uncomment the following line to disable/enable debugging +#DEBUG = y + + +# Add your debugging flag (or not) to CFLAGS +ifeq ($(DEBUG),y) + DEBFLAGS = -O -g -DSCULL_DEBUG # "-O" is needed to expand inlines +else + DEBFLAGS = -O2 +endif + +EXTRA_CFLAGS += $(DEBFLAGS) -I.. + +ifneq ($(KERNELRELEASE),) +# call from kernel build system + +#obj-m := tiny_tty.o tiny_serial.o tty0tty.o +obj-m := tty0tty.o + +else + +KERNELDIR ?= /lib/modules/$(shell uname -r)/build +PWD := $(shell pwd) + +default: + $(MAKE) -C $(KERNELDIR) M=$(PWD) modules + +endif + + + +clean: + rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions modules.order Module.symvers + +depend .depend dep: + $(CC) $(CFLAGS) -M *.c > .depend + + +ifeq (.depend,$(wildcard .depend)) +include .depend +endif diff --git b/module/tty0tty.c a/module/tty0tty.c new file mode 100644 index 0000000..1628621 --- /dev/null +++ a/module/tty0tty.c @@ -0,0 +1,642 @@ +/* ######################################################################## + + tty0tty - linux null modem emulator (module) + + ######################################################################## + + Copyright (c) : 2010 Luis Claudio Gambôa Lopes + + Based in Tiny TTY driver - Copyright (C) 2002-2004 Greg Kroah-Hartman (greg@kroah.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; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + For e-mail suggestions : lcgamboa@yahoo.com + ######################################################################## */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define DRIVER_VERSION "v1.0" +#define DRIVER_AUTHOR "Luis Claudio Gamboa Lopes " +#define DRIVER_DESC "tty0tty null modem driver" + +/* Module information */ +MODULE_AUTHOR( DRIVER_AUTHOR ); +MODULE_DESCRIPTION( DRIVER_DESC ); +MODULE_LICENSE("GPL"); + + +#define TINY_TTY_MAJOR 240 /* experimental range */ +#define TINY_TTY_MINORS 8 /* device number, always even*/ + +/* fake UART values */ +//out +#define MCR_DTR 0x01 +#define MCR_RTS 0x02 +#define MCR_LOOP 0x04 +//in +#define MSR_CTS 0x10 +#define MSR_CD 0x20 +#define MSR_DSR 0x40 +#define MSR_RI 0x80 + +struct tty0tty_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 */ + + /* 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 tty0tty_serial *tty0tty_table[TINY_TTY_MINORS]; /* initially all NULL */ + + +static int tty0tty_open(struct tty_struct *tty, struct file *file) +{ + struct tty0tty_serial *tty0tty; + int index; + int msr=0; + int mcr=0; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + /* initialize the pointer in case something fails */ + tty->driver_data = NULL; + + /* get the serial object associated with this tty pointer */ + index = tty->index; + tty0tty = tty0tty_table[index]; + if (tty0tty == NULL) { + /* first time accessing this device, let's create it */ + tty0tty = kmalloc(sizeof(*tty0tty), GFP_KERNEL); + if (!tty0tty) + return -ENOMEM; + + init_MUTEX(&tty0tty->sem); + tty0tty->open_count = 0; + + tty0tty_table[index] = tty0tty; + + } + + if( (index % 2) == 0) + { + if(tty0tty_table[index+1] != NULL) + if (tty0tty_table[index+1]->open_count > 0) + mcr=tty0tty_table[index+1]->mcr; + } + else + { + if(tty0tty_table[index-1] != NULL) + if (tty0tty_table[index-1]->open_count > 0) + mcr=tty0tty_table[index-1]->mcr; + } + +//null modem connection + + if( (mcr & MCR_RTS) == MCR_RTS ) + { + msr |= MSR_CTS; + } + + if( (mcr & MCR_DTR) == MCR_DTR ) + { + msr |= MSR_DSR; + msr |= MSR_CD; + } + + tty0tty->msr = msr; + + down(&tty0tty->sem); + + /* save our structure within the tty structure */ + tty->driver_data = tty0tty; + tty0tty->tty = tty; + + ++tty0tty->open_count; + + up(&tty0tty->sem); + return 0; +} + +static void do_close(struct tty0tty_serial *tty0tty) +{ + down(&tty0tty->sem); +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + if (!tty0tty->open_count) { + /* port was never opened */ + goto exit; + } + + --tty0tty->open_count; +exit: + up(&tty0tty->sem); + + return; +} + +static void tty0tty_close(struct tty_struct *tty, struct file *file) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + if (tty0tty) + do_close(tty0tty); +} + +static int tty0tty_write(struct tty_struct *tty, const unsigned char *buffer, int count) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + int retval = -EINVAL; + struct tty_struct *ttyx = NULL; + + if (!tty0tty) + return -ENODEV; + + down(&tty0tty->sem); + + if (!tty0tty->open_count) + /* port was not opened */ + goto exit; + + if( (tty0tty->tty->index % 2) == 0) + { + if(tty0tty_table[tty0tty->tty->index+1] != NULL) + if (tty0tty_table[tty0tty->tty->index+1]->open_count > 0) + ttyx=tty0tty_table[tty0tty->tty->index+1]->tty; + } + else + { + if(tty0tty_table[tty0tty->tty->index-1] != NULL) + if (tty0tty_table[tty0tty->tty->index-1]->open_count > 0) + ttyx=tty0tty_table[tty0tty->tty->index-1]->tty; + } + +// tty->low_latency=1; + + if(ttyx != NULL) + { + tty_insert_flip_string(ttyx, buffer, count); + tty_flip_buffer_push(ttyx); + retval=count; + } + +exit: + up(&tty0tty->sem); + return retval; +} + +static int tty0tty_write_room(struct tty_struct *tty) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + int room = -EINVAL; + + if (!tty0tty) + return -ENODEV; + + down(&tty0tty->sem); + + if (!tty0tty->open_count) { + /* port was not opened */ + goto exit; + } + + /* calculate how much room is left in the device */ + room = 255; + +exit: + up(&tty0tty->sem); + return room; +} + +#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) + +static void tty0tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios) +{ + unsigned int cflag; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + 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))) { +#ifdef SCULL_DEBUG + printk(KERN_DEBUG " - nothing to change...\n"); +#endif + return; + } + } + +#ifdef SCULL_DEBUG + /* 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\n", start_char, stop_char); + else + printk(KERN_DEBUG" - INBOUND XON/XOFF is disabled\n"); + + /* if we are implementing OUTBOUND XON/XOFF */ + if (I_IXON(tty)) + printk(KERN_DEBUG" - OUTBOUND XON/XOFF is enabled, " + "XON = %2x, XOFF = %2x\n", start_char, stop_char); + else + printk(KERN_DEBUG" - OUTBOUND XON/XOFF is disabled\n"); + } + + /* get the baud rate wanted */ + printk(KERN_DEBUG " - baud rate = %d\n", tty_get_baud_rate(tty)); +#endif +} + + +static int tty0tty_tiocmget(struct tty_struct *tty, struct file *file) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + + unsigned int result = 0; + unsigned int msr = tty0tty->msr; + unsigned int mcr = tty0tty->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 tty0tty_tiocmset(struct tty_struct *tty, struct file *file, + unsigned int set, unsigned int clear) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + unsigned int mcr = tty0tty->mcr; + unsigned int msr=0; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + + if( (tty0tty->tty->index % 2) == 0) + { + if(tty0tty_table[tty0tty->tty->index+1] != NULL) + if (tty0tty_table[tty0tty->tty->index+1]->open_count > 0) + msr=tty0tty_table[tty0tty->tty->index+1]->msr; + } + else + { + if(tty0tty_table[tty0tty->tty->index-1] != NULL) + if (tty0tty_table[tty0tty->tty->index-1]->open_count > 0) + msr=tty0tty_table[tty0tty->tty->index-1]->msr; + } + +//null modem connection + + if (set & TIOCM_RTS) + { + mcr |= MCR_RTS; + msr |= MSR_CTS; + } + + if (set & TIOCM_DTR) + { + mcr |= MCR_DTR; + msr |= MSR_DSR; + msr |= MSR_CD; + } + + if (clear & TIOCM_RTS) + { + mcr &= ~MCR_RTS; + msr &= ~MSR_CTS; + } + + if (clear & TIOCM_DTR) + { + mcr &= ~MCR_DTR; + msr &= ~MSR_DSR; + msr &= ~MSR_CD; + } + + + /* set the new MCR value in the device */ + tty0tty->mcr = mcr; + + if( (tty0tty->tty->index % 2) == 0) + { + if(tty0tty_table[tty0tty->tty->index+1] != NULL) + if (tty0tty_table[tty0tty->tty->index+1]->open_count > 0) + tty0tty_table[tty0tty->tty->index+1]->msr=msr; + } + else + { + if(tty0tty_table[tty0tty->tty->index-1] != NULL) + if (tty0tty_table[tty0tty->tty->index-1]->open_count > 0) + tty0tty_table[tty0tty->tty->index-1]->msr=msr; + } + return 0; +} + + +static int tty0tty_ioctl_tiocgserial(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + if (cmd == TIOCGSERIAL) { + struct serial_struct tmp; + + if (!arg) + return -EFAULT; + + memset(&tmp, 0, sizeof(tmp)); + + tmp.type = tty0tty->serial.type; + tmp.line = tty0tty->serial.line; + tmp.port = tty0tty->serial.port; + tmp.irq = tty0tty->serial.irq; + tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; + tmp.xmit_fifo_size = tty0tty->serial.xmit_fifo_size; + tmp.baud_base = tty0tty->serial.baud_base; + tmp.close_delay = 5*HZ; + tmp.closing_wait = 30*HZ; + tmp.custom_divisor = tty0tty->serial.custom_divisor; + tmp.hub6 = tty0tty->serial.hub6; + tmp.io_type = tty0tty->serial.io_type; + + if (copy_to_user((void __user *)arg, &tmp, sizeof(struct serial_struct))) + return -EFAULT; + return 0; + } + return -ENOIOCTLCMD; +} + +static int tty0tty_ioctl_tiocmiwait(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + if (cmd == TIOCMIWAIT) { + DECLARE_WAITQUEUE(wait, current); + struct async_icount cnow; + struct async_icount cprev; + + cprev = tty0tty->icount; + while (1) { + add_wait_queue(&tty0tty->wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + remove_wait_queue(&tty0tty->wait, &wait); + + /* see if a signal woke us up */ + if (signal_pending(current)) + return -ERESTARTSYS; + + cnow = tty0tty->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; +} + +static int tty0tty_ioctl_tiocgicount(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct tty0tty_serial *tty0tty = tty->driver_data; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + if (cmd == TIOCGICOUNT) { + struct async_icount cnow = tty0tty->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; +} + +static int tty0tty_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - %04X \n", __FUNCTION__,cmd); +#endif + switch (cmd) { + case TIOCGSERIAL: + return tty0tty_ioctl_tiocgserial(tty, file, cmd, arg); + case TIOCMIWAIT: + return tty0tty_ioctl_tiocmiwait(tty, file, cmd, arg); + case TIOCGICOUNT: + return tty0tty_ioctl_tiocgicount(tty, file, cmd, arg); + } + + return -ENOIOCTLCMD; +} + +static struct tty_operations serial_ops = { + .open = tty0tty_open, + .close = tty0tty_close, + .write = tty0tty_write, + .write_room = tty0tty_write_room, + .set_termios = tty0tty_set_termios, + .tiocmget = tty0tty_tiocmget, + .tiocmset = tty0tty_tiocmset, + .ioctl = tty0tty_ioctl, +}; + +static struct tty_driver *tty0tty_tty_driver; + +static int __init tty0tty_init(void) +{ + + int retval; +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + /* allocate the tty driver */ + tty0tty_tty_driver = alloc_tty_driver(TINY_TTY_MINORS); + if (!tty0tty_tty_driver) + return -ENOMEM; + + /* initialize the tty driver */ + tty0tty_tty_driver->owner = THIS_MODULE; + tty0tty_tty_driver->driver_name = "tty0tty"; + tty0tty_tty_driver->name = "tnt"; + /* no more devfs subsystem */ + tty0tty_tty_driver->major = TINY_TTY_MAJOR; + tty0tty_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; + tty0tty_tty_driver->subtype = SERIAL_TYPE_NORMAL; + tty0tty_tty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW ; + /* no more devfs subsystem */ + tty0tty_tty_driver->init_termios = tty_std_termios; + tty0tty_tty_driver->init_termios.c_iflag = 0; + tty0tty_tty_driver->init_termios.c_oflag = 0; + tty0tty_tty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; + tty0tty_tty_driver->init_termios.c_lflag = 0; + tty0tty_tty_driver->init_termios.c_ispeed = 38400; + tty0tty_tty_driver->init_termios.c_ospeed = 38400; + + + tty_set_operations(tty0tty_tty_driver, &serial_ops); + + + /* register the tty driver */ + retval = tty_register_driver(tty0tty_tty_driver); + if (retval) { + printk(KERN_ERR "failed to register tty0tty tty driver"); + put_tty_driver(tty0tty_tty_driver); + return retval; + } + + printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION); + return retval; +} + +static void __exit tty0tty_exit(void) +{ + struct tty0tty_serial *tty0tty; + int i; + +#ifdef SCULL_DEBUG + printk(KERN_DEBUG "%s - \n", __FUNCTION__); +#endif + for (i = 0; i < TINY_TTY_MINORS; ++i) + tty_unregister_device(tty0tty_tty_driver, i); + tty_unregister_driver(tty0tty_tty_driver); + + /* shut down all of the timers and free the memory */ + for (i = 0; i < TINY_TTY_MINORS; ++i) { + tty0tty = tty0tty_table[i]; + if (tty0tty) { + /* close the port */ + while (tty0tty->open_count) + do_close(tty0tty); + + /* shut down our timer and free the memory */ + kfree(tty0tty); + tty0tty_table[i] = NULL; + } + } +} + +module_init(tty0tty_init); +module_exit(tty0tty_exit); diff --git b/pts/Makefile a/pts/Makefile new file mode 100644 index 0000000..07f9b96 --- /dev/null +++ a/pts/Makefile @@ -0,0 +1,10 @@ + +CC=gcc + +FLAGS= -Wall -O2 -D_GNU_SOURCE + +all: + $(CC) $(FLAGS) tty0tty.c -o tty0tty + +clean: + rm -rf tty0tty *.o core diff --git b/pts/tty0tty.c a/pts/tty0tty.c new file mode 100644 index 0000000..611f628 --- /dev/null +++ a/pts/tty0tty.c @@ -0,0 +1,141 @@ +/* ######################################################################## + + tty0tty - linux null modem emulator + + ######################################################################## + + Copyright (c) : 2010 Luis Claudio Gambôa Lopes + + 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; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + For e-mail suggestions : lcgamboa@yahoo.com + ######################################################################## */ + + +#include +#include +#include +#include +#include + +#include + +int +ptym_open(char *pts_name, char *pts_name_s , int pts_namesz) +{ + char *ptr; + int fdm; + + strncpy(pts_name, "/dev/ptmx", pts_namesz); + pts_name[pts_namesz - 1] = '\0'; + + fdm = posix_openpt(O_RDWR | O_NONBLOCK); + if (fdm < 0) + return(-1); + if (grantpt(fdm) < 0) + { + close(fdm); + return(-2); + } + if (unlockpt(fdm) < 0) + { + close(fdm); + return(-3); + } + if ((ptr = ptsname(fdm)) == NULL) + { + close(fdm); + return(-4); + } + + strncpy(pts_name_s, ptr, pts_namesz); + pts_name[pts_namesz - 1] = '\0'; + + return(fdm); +} + + +int +conf_ser(int serialDev) +{ + +int rc=0; +struct termios params; + +// Get terminal atributes +rc = tcgetattr(serialDev, ¶ms); + +// Modify terminal attributes +cfmakeraw(¶ms); + +rc = cfsetispeed(¶ms, B9600); + +rc = cfsetospeed(¶ms, B9600); + +// CREAD - Enable port to read data +// CLOCAL - Ignore modem control lines +params.c_cflag |= (B9600 |CS8 | CLOCAL | CREAD); + +// Make Read Blocking +//fcntl(serialDev, F_SETFL, 0); + +// Set serial attributes +rc = tcsetattr(serialDev, TCSANOW, ¶ms); + +// Flush serial device of both non-transmitted +// output data and non-read input data.... +tcflush(serialDev, TCIOFLUSH); + + + return EXIT_SUCCESS; +} + + +int main(void) +{ + char master1[1024]; + char slave1[1024]; + char master2[1024]; + char slave2[1024]; + + int fd1; + int fd2; + + char c1,c2; + + fd1=ptym_open(master1,slave1,1024); + + fd2=ptym_open(master2,slave2,1024); + + printf("(%s) <=> (%s)\n",slave1,slave2); + + + conf_ser(fd1); + conf_ser(fd2); + + + while(1) + { + if(read (fd1,&c1,1) == 1) write(fd2,&c1,1); + usleep(20); + if(read (fd2,&c2,1) == 1) write(fd1,&c2,1); + usleep(20); + }; + + close(fd1); + close(fd2); + + return EXIT_SUCCESS; +}