ftp.nice.ch/pub/next/unix/communication/newam.0.1.s.tar.gz#/newam-0.1/src/device.c

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/*********************************************************************/
/*                                                                   */
/* Programmer:                                                       */
/*   Olaf Mueller <olaf@orest.escape.de>                             */
/*                                                                   */
/* Purpose:                                                          */
/*   Answering Machine                                               */
/*       open, close, lock, unlock the device                        */
/*                                                                   */
/* History:                                                          */
/*   29-08-96   Initial Release           Olaf Mueller               */
/*                                                                   */
/* Notes:                                                            */
/*                                                                   */
/*********************************************************************/

#include <libc.h>

#include "device.h"


#define LOCKNAME			"/usr/spool/uucp/LCK/LCK.."


int openDevice (char *devicetype,char port)
{
	char			devicename [MAXPATHLEN+1] ;

	sprintf (devicename,"/dev/%s%c",devicetype,port) ;
	return  open (devicename,O_RDWR,0) ;
}


int initDevice (int line,int baud)
{
	struct sgttyb	tdis ;

	ioctl (line,TIOCGETP,&tdis) ;
	tdis.sg_ispeed = tdis.sg_ospeed = baud ;
	tdis.sg_flags = RAW | TANDEM ;
	ioctl (line,TIOCSETP,&tdis) ;							/* set baud rate and raw mode */
	ioctl (line,TIOCCDTR,NULL) ;							/* reset DataTerminalReady */
	usleep (100000L) ;
	ioctl (line,TIOCSDTR,NULL) ;							/* set DataTerminalReady */
	usleep (1000000L) ;
	fcntl (line,F_SETFL,(fcntl(line,F_GETFL,0))&~O_NDELAY) ;
	return  0 ;
}


/*
 * returns zero if the operation succeeds, -1 if it fails
 */
int lockDevice (char *devicetype,char port)
{
	char	filename [MAXPATHLEN+1] , pidstr [20] ;
	int		fd , len , rc = -1 ;

	sprintf (filename,"%s%s%c",LOCKNAME,devicetype,port) ;
	if ((fd = open(filename,O_WRONLY|O_CREAT|O_EXCL,0644)) > 0)
	{
		sprintf (pidstr,"%d\n",getpid()) ;
		len = strlen (pidstr) ;
		if (write(fd,pidstr,len) == len)
			rc = 0 ;
		close (fd) ;
	}
	return  rc ;
}


/*
 * returns zero if the operation succeeds, nonzero if it fails
 */
int unlockDevice (char *devicetype,char port)
{
	char	filename [MAXPATHLEN+1] ;

	sprintf (filename,"%s%s%c",LOCKNAME,devicetype,port) ;
	return  remove (filename) ;
}


/*
 * returns zero if the operation succeeds, nonzero if it fails
 */
int deviceLocked (char *devicetype,char port)
{
	char	filename [MAXPATHLEN+1] ;

	sprintf (filename,"%s%s%c",LOCKNAME,devicetype,port) ;
	return  access (filename,F_OK) ;
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.