source: trunk/tools/alcons/alcons.c @ 553

/*
 *******************************************************************************
 * Authors:
 *     Maxime Villard, 2017
 *     Jankovic Marco, 01/07/2014
 *******************************************************************************
 */

#include "common.h"

/*
 * tab containing all the slave side of a dev/pts
 * this part is swappable with other device
 */
int slave_fd[NB_CHANNELS];

/*
 * tab containing all the masters that come from /dev/pts/ptmx
 * this part is swappable with other device
 */
int master_fd[NB_CHANNELS];

/*
 * file descriptor of fifo rx and tx
 * file descriptor device_fd
 * nb_channels to multiplex
 */
int fifo_rx_fd;
int fifo_tx_fd;

#if TEST_BENCH
int test_rx_fd; // file descriptor that simulates RX buffer
int test_tx_fd; // file descriptor that simulates TX buffer
#else
int device_fd;
#endif

pthread_t tid[3];

/*
 * Function that opens an xterm. You need a master side and a slave side.
 * master_fd -> contains master fd from /dev/ptmx
 * slavename -> slave name from /dev/pts
 */
static int exec_xterm(int *master_fd, char *slavename, int tty_id)
{
        char buf[64];
        char tty_name[64];

        *master_fd = posix_openpt(O_RDWR);
        grantpt(*master_fd);
        unlockpt(*master_fd);

        if (ptsname_r(*master_fd, slavename, 64) != 0)
                perror("ptsname_r");

        printf("-> master_fd: %d\n", *master_fd);
        printf("-> slavename: %s\n", slavename);

        snprintf(buf, sizeof(buf), "-S%s/%d", strrchr(slavename,'/')+1, *master_fd);
        snprintf(tty_name, sizeof(buf), "tty_%d", tty_id);
        if (!fork()) {
                execlp("xterm", "xterm",
                                buf,
                                "-T", tty_name,
                                "-bg", "black",
                                "-fg", "green",
                                "-geometry", "80x25",
                                NULL);
                _exit(1);
        }

        return 0;
}

/*
 * Function that closes all file descriptors, kills all the threads and resets
 * the rs 232 port.
 */
void termination_handler(int signum)
{
        int i;
        printf("termination handler %d \n",signum);

        for (i = 0; i < 3; i++) {
                if (pthread_kill(tid[i], SIGTERM) < 0)
                        err(1, "pthread_kill");
        }

        if (close(fifo_rx_fd) < 0)
                err(1, "close");
        if (close(fifo_tx_fd) < 0)
                err(1, "close");

#if TEST_BENCH
        if (close(test_tx_fd) < 0)
                err(1, "close");
        if (close(test_rx_fd) < 0)
                err(1, "close");
#else
        if (close(device_fd) < 0)
                err(1, "close");
#endif

        for (i = 0; i < NB_CHANNELS; i++) {
                if (close(slave_fd[i]) < 0)
                        err(1, "close");
                if (close(master_fd[i]) < 0)
                        err(1, "close");
        }

        exit(0);
}

static void init_tio(struct termios *tio)
{
        // Input flags - Turn off input processing
        // convert break to null byte, no CR to NL translation,
        // no NL to CR translation, don't mark parity errors or breaks
        // no input parity check, don't strip high bit off,
        // no XON/XOFF software flow control
        tio->c_cflag &= ~(IGNBRK | BRKINT | ICRNL | INLCR | PARMRK | INPCK | ISTRIP | IXON | CRTSCTS);
        tio->c_cflag |= (CLOCAL | CREAD);

        // Output flags - Turn off output processing
        // // no CR to NL translation, no NL to CR-NL translation,
        // // no NL to CR translation, no column 0 CR suppression,
        // // no Ctrl-D suppression, no fill characters, no case mapping,
        // // no local output processing
        tio->c_oflag &=~(OCRNL | ONLCR | ONLRET | ONOCR | OFILL | OLCUC | OPOST);
        tio->c_oflag = 0;

        //// No line processing:
        //// echo off, echo newline off, canonical mode off,
        //// extended input processing off, signal chars off
        ////
        tio->c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);

        ////
        //// Turn off character processing
        //// clear current char size mask, no parity checking,
        //// no output processing, force 8 bit input
        //// 8N1
        ////
        tio->c_cflag &= ~(CSIZE |PARENB|CSTOPB);
        tio->c_cflag |= CS8;
        ////

        tio->c_iflag &= ~(IXON | IXOFF | IXANY | INPCK | ISTRIP );

        ////
        //// One input byte is enough to return from read()
        //// Inter-character timer off
        ////
        tio->c_cc[VMIN]  = 1;
        tio->c_cc[VTIME] = 0;

        /* set baudrate */
        if (cfsetispeed(tio, BAUDRATE) < 0 || cfsetospeed(tio, BAUDRATE) < 0)
                err(1, "error setting baudrate");
}

int main(void)
{
        char slavename[NB_CHANNELS][64];
        int i;
        char buf[64];

        pthread_attr_t thread_attr;

        /******************** signal handler ****************/
        sigset_t sig_set;
        sigset_t sig_set_act;

        sigemptyset(&sig_set);
        sigfillset(&sig_set);
        sigdelset(&sig_set, SIGINT);
        sigprocmask(SIG_BLOCK, &sig_set, NULL);

        sigemptyset(&sig_set_act);

        struct sigaction action;
        action.sa_handler = termination_handler;
        action.sa_mask = sig_set_act;
        action.sa_flags = 0;
        sigaction(SIGINT, &action, NULL);

        /****************************************************/
        printf("[+] device path: %s\n", DEVICE_PATH);
        printf("[+] nb_channels: %d\n", NB_CHANNELS);

        /*
         * Opening 2 FIFOs: one fifo for input data and the other one for
         * output data.
         */
        if (mkfifo(FIFO_RX, S_IRWXU) < 0)
                err(1, "mkfifo");
        if (mkfifo(FIFO_TX, S_IRWXU) < 0)
                err(1, "mkfifo");

        if ((fifo_rx_fd = open(FIFO_RX, O_RDWR|O_SYNC|O_NONBLOCK, 0777)) < 0)
                err(1, "open");
        if ((fifo_tx_fd = open(FIFO_TX, O_RDWR|O_SYNC|O_NONBLOCK, 0777)) < 0)
                err(1, "open");
        /*******************************************************************/

        printf("[+] Opening the xterms\n");

        for (i = 0; i < NB_CHANNELS; i++) {
                exec_xterm(&master_fd[i], slavename[i], i);
                slave_fd[i] = open(slavename[i], O_RDWR|O_SYNC, 0777);
                do {
                        read(slave_fd[i], buf, 1);
                } while (*buf != '\n' && *buf != '\r');
        }

#if TEST_BENCH
        printf("opening test files\n");
        if (mkfifo("test_rx.txt", S_IRWXU) < 0)
                err(1, "mkfifo");
        if (mkfifo("test_tx.txt", S_IRWXU) < 0)
                err(1, "mkfifo");
        if ((test_rx_fd = open("test_rx.txt", O_RDWR|O_SYNC|O_NONBLOCK, 0777)) < 0)
                err(1, "open");
        if ((test_tx_fd = open("test_tx.txt", O_RDWR|O_SYNC|O_NONBLOCK, 0777)) < 0)
                err(1, "open");
#else
        printf("[+] Opening %s\n", DEVICE_PATH);
        if ((device_fd = open(DEVICE_PATH, O_RDWR|O_NOCTTY|O_NDELAY)) < 0)
                err(1, "open");
        fcntl(device_fd, F_SETFL, 0);

        /*
         * Set the rs232 port
         */
        struct termios newtio;

        printf("[+] Setting %s rs232 port\n", DEVICE_PATH);

        memset(&newtio, 0, sizeof(newtio));
        init_tio(&newtio);

        if (tcsetattr(device_fd, TCSAFLUSH, &newtio) < 0)
                err(1, "tcsetattr");
#endif

        printf("[+] Launching the threads\n");

        /*
         * Initialize the thread attributes.
         */
        if (pthread_attr_init(&thread_attr) != 0)
                err(1, "pthread_attr_init");
        if (pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED) != 0)
                err(1, "pthread_attr_setdetachstate");

        /*
         * Launch the threads.
         */
        if (pthread_create(tid, &thread_attr, thread_mux_demux, NULL) != 0)
                err(1, "pthread_create");
        if (pthread_create(tid + 1, &thread_attr, thread_read_rx, NULL) != 0)
                err(1, "pthread_create");
        if (pthread_create(tid + 2, &thread_attr, thread_write_tx, NULL) != 0)
                err(1, "pthread_create");

#if TEST_BENCH
        char buftest[2];
        unsigned char pkt[PACKET_SIZE];

        sleep(1);

        while (1) {
                printf("ttyid> ");

                buftest[0] = getchar();
                buftest[1] = '\n';
                getchar();

                pkt[PKT_TTY] = 0x80 | atoi(buftest);

                printf("cmd> ");
                do {
                        pkt[PKT_DAT] = getchar();
                        write(test_rx_fd, pkt, PACKET_SIZE);
                } while (pkt[PKT_DAT] != '\n');
        }
#else
        while(1)
                sleep(1);
#endif

        return 0;
}