/* ephfc.c

handle hardware flow control on EPORTS and then exec login

This program sets hardware flow control on an EPORTS card in an
AT&T 3B2 computer. Patch getty (or uugetty) to exec ephfc instead of login.

04/18/1992 - Elliot Dierksen (elliot@oau.org)

*/

/* standard header files */
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ct_dep.h>
#include <termio.h>

/* EPORTS header files */
#include <sys/queue.h>
/*#include <sys/ep_dep.h>*/
#include <sys/eppc.h>
#include <sys/ep_lla.h>

#define IN_FD   0
#define OUT_FD  1

main(argc,argv,envp)
int argc;
char **argv,**envp;
{
char *login_prog = "/bin/login";
struct etty ettyp;
struct termio termiop;

	/* abort if ioctl read fails. this might happen this is not an EPORT */
	if (ioctl(IN_FD,EP_GETA,&ettyp) == -1)
	{
		fprintf(stderr,"%s: ioctl(EP_GETA) failed(%d)\n",argv[0],errno);
		fflush(stderr);
		exit(6);
	}

	/* abort if ioctl read fails. No clue what might have gone wrong! */
	if (ioctl(IN_FD,TCGETA,&termiop) == -1)
	{
		fprintf(stderr,"%s: ioctl(TCGETA) failed(%d)\n",argv[0],errno);
		fflush(stderr);
		exit(7);
	}

	/* turn off XON/XOFF */
	termiop.c_iflag &= ~(IXON|IXOFF|IXANY);

	/* set regular ioctl values */
	ioctl(OUT_FD,TCSETA,&termiop);

	/* set EPORTS values */
	ioctl(OUT_FD,EP_HFC,0);

	/* reset arg[0] for login */
	argv[0] = login_prog;

	/* exec login and hope for the best! */
	execv(login_prog,argv);
}