File: mp_serial.c

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/* $Id$
   //  PLP - An implementation of the PSION link protocol
   //
   //
   //  The code in this file was written by Rudolf Koenig
   //  (rfkoenig@immd4.informatik.uni-erlangen.de). (from his p3nfs code)
   //  The Copyright remains his
   //
   //
   //  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
   //
   //  e-mail philip.proudman@btinternet.com
 */


#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>		/* for usleep() */
#include <string.h>		/* for bzero() */
#include <termios.h>
#if defined(linux) || defined(_IBMR2) || \
	defined(__NetBSD__) || defined(__FreeBSD__)
#include <sys/ioctl.h>		/* for ioctl() */
#endif
#include <sys/errno.h>
#ifdef sun
#include <sys/ttold.h>		/* sun has TIOCEXCL there */
#endif
#include <stdlib.h>

#ifndef hpux
#define mflag int
#else				/* hpux */
#include <sys/termiox.h>
#include <sys/modem.h>
#endif

#include "mp_serial.h"


#ifdef __sgi
#define CRTSCTS CNEW_RTSCTS
#endif

#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif

int
init_serial(const char *dev, int speed, int debug)
{
    int fd, baud;
    int uid, euid;
    struct termios ti;
#ifdef hpux
    struct termiox tx;
#endif
    static struct baud {
	int speed, baud;
    } btable[] = {
	{ 9600, B9600 },
#ifdef B19200
	{ 19200, B19200 },
#else
#ifdef EXTA
	{ 19200, EXTA },
#endif
#endif
#ifdef B38400
	{ 38400, B38400 },
#else
#ifdef EXTB
	{ 38400, EXTB },
#endif
#endif
#ifdef B57600
	{ 57600, B57600 },
#endif
#ifdef B115200
	{ 115200, B115200 },
#endif
	{ 4800, B4800 },
	{ 2400, B2400 },
	{ 1200, B1200 },
	{ 300, B300 },
	{ 75, B75 },
	{ 50, B50 },
	{ 0, 0 }
    }, *bptr;

    if (speed) {
	for (bptr = btable; bptr->speed; bptr++)
	    if (bptr->speed == speed)
		break;
	if (!bptr->baud) {
	    fprintf(stderr, "Cannot match selected speed %d\n", speed);
	    exit(1);
	}
	baud = bptr->baud;
    } else
	baud = 0;
    
    if (debug)
	printf("using %s...\n", dev);
    euid = geteuid();
    uid = getuid();

#ifdef hpux
#define seteuid(a) setresuid(-1, a, -1)
#endif

    if (seteuid(uid)) {
	perror("seteuid");
	exit(1);
    }
    if ((fd = open(dev, O_RDWR | O_NOCTTY, 0)) < 0) {
	perror(dev);
	exit(1);
    }
    if (seteuid(euid)) {
	perror("seteuid back");
	exit(1);
    }
    if (debug)
	printf("open done\n");
#ifdef TIOCEXCL
    ioctl(fd, TIOCEXCL, (char *) 0);	/* additional open() calls shall fail */
#else
    fprintf(stderr, "WARNING: opened %s non-exclusive!\n", dev);
#endif

    memset(&ti, 0, sizeof(struct termios));
#if defined(hpux) || defined(_IBMR2)
    ti.c_cflag = CS8 | HUPCL | CLOCAL | CREAD;
#endif
#if defined(sun) || defined(linux) || defined(__sgi) || \
	defined(__NetBSD__) || defined(__FreeBSD__)
    ti.c_cflag = CS8 | HUPCL | CLOCAL | CRTSCTS | CREAD;
    ti.c_iflag = IGNBRK | IGNPAR /*| IXON | IXOFF */;
    ti.c_cc[VMIN] = 1;
    ti.c_cc[VTIME] = 0;
#endif
    cfsetispeed(&ti, baud);
    cfsetospeed(&ti, baud);

    if (tcsetattr(fd, TCSADRAIN, &ti) < 0)
	perror("tcsetattr TCSADRAIN");

#ifdef hpux
    bzero(&tx, sizeof(struct termiox));
    tx.x_hflag = RTSXOFF | CTSXON;
    if (ioctl(fd, TCSETXW, &tx) < 0)
	perror("TCSETXW");
#endif

#if defined(_IBMR2)
    ioctl(fd, TXDELCD, "dtr");
    ioctl(fd, TXDELCD, "xon");
    ioctl(fd, TXADDCD, "rts");	/* That's how AIX does CRTSCTS */
#endif
    return fd;
}

void
ser_exit(int fd)
{
    struct termios ti;

#ifdef TIOCNXCL
    ioctl(fd, TIOCNXCL, (char *) 0);
#endif
    if (tcgetattr(fd, &ti) < 0)
	perror("tcgetattr");
    ti.c_cflag &= ~CRTSCTS;
    if (tcsetattr(fd, TCSANOW, &ti) < 0)
	perror("tcsetattr");
    (void) close(fd);
}