/* interact (with only one process) - give user keyboard control

Written by: Don Libes, NIST, 2/6/90

Design and implementation of this program was paid for by U.S. tax

dollars.  Therefore it is public domain.  However, the author and NIST

would appreciate credit if this program or parts of it are used.

*/

/* This file exists for deficient versions of UNIX that lack select,

poll, or some other multiplexing hook.  Instead, this code uses two

processes per spawned process.  One sends characters from the spawnee

to the spawner; a second send chars the other way.

This will work on any UNIX system.  The only sacrifice is that it

doesn't support multiple processes.  Eventually, it should catch

SIGCHLD on dead processes and do the right thing.  But it is pretty

gruesome to imagine so many processes to do all this.  If you change

it successfully, please mail back the changes to me.  - Don

*/

#include "expect_cf.h"

#include <stdio.h>

#include <sys/types.h>

#include <sys/time.h>

#ifdef HAVE_SYS_WAIT_H

#include <sys/wait.h>

#endif

#include "tcl.h"

#include "exp_prog.h"

#include "exp_command.h"	/* for struct ExpState defs */

#include "exp_event.h"

/*ARGSUSED*/

void

exp_arm_background_filehandler(esPtr)

ExpState *esPtr;

{

}

/*ARGSUSED*/

void

exp_disarm_background_filehandler(esPtr)

ExpState *esPtr;

{

}

/*ARGSUSED*/

void

exp_disarm_background_filehandler_force(esPtr)

ExpState *esPtr;

{

}

/*ARGSUSED*/

void

exp_unblock_background_filehandler(esPtr)

ExpState *esPtr;

{

}

/*ARGSUSED*/

void

exp_block_background_filehandler(esPtr)

ExpState *esPtr;

{

}

/*ARGSUSED*/

void

exp_event_disarm(fd)

int fd;

{

}

/* returns status, one of EOF, TIMEOUT, ERROR or DATA */

/*ARGSUSED*/

int

exp_get_next_event(interp,esPtrs, n,esPtrOut,timeout,key)

Tcl_Interp *interp;

ExpState (*esPtrs)[];

int n;			/* # of esPtrs */

ExpState **esPtrOut;	/* 1st event master, not set if none */

int timeout;		/* seconds */

int key;

{

    if (n > 1) {

	exp_error(interp,"expect not compiled with multiprocess support");

	/* select a different INTERACT_TYPE in Makefile */

	return(TCL_ERROR);

    }

    esPtr = *esPtrOut = esPtrs[0];

    if (esPtr->key != key) {

	esPtr->key = key;

	esPtr->force_read = FALSE;

	return(EXP_DATA_OLD);

    } else if ((!esPtr->force_read) && (esPtr->size != 0)) {

	return(EXP_DATA_OLD);

    }

    return(EXP_DATA_NEW);

}

/*ARGSUSED*/

int

exp_get_next_event_info(interp,esPtr,ready_mask)

Tcl_Interp *interp;

ExpState *esPtr;

int ready_mask;

{

}

/* There is no portable way to do sub-second sleeps on such a system, so */

/* do the next best thing (without a busy loop) and fake it: sleep the right */

/* amount of time over the long run.  Note that while "subtotal" isn't */

/* reinitialized, it really doesn't matter for such a gross hack as random */

/* scheduling pauses will easily introduce occasional one second delays. */

int	/* returns TCL_XXX */

exp_dsleep(interp,sec)

Tcl_Interp *interp;

double sec;

{

	static double subtotal = 0;

	int seconds;

	subtotal += sec;

	if (subtotal < 1) return TCL_OK;

	seconds = subtotal;

	subtotal -= seconds;

 restart:

	if (Tcl_AsyncReady()) {

		int rc = Tcl_AsyncInvoke(interp,TCL_OK);

		if (rc != TCL_OK) return(rc);

	}

	sleep(seconds);

	return TCL_OK;

}

#if 0

/* There is no portable way to do sub-second sleeps on such a system, so */

/* do the next best thing (without a busy loop) and fake it: sleep the right */

/* amount of time over the long run.  Note that while "subtotal" isn't */

/* reinitialized, it really doesn't matter for such a gross hack as random */

/* scheduling pauses will easily introduce occasional one second delays. */

int	/* returns TCL_XXX */

exp_usleep(interp,usec)

Tcl_Interp *interp;

long usec;		/* microseconds */

{

	static subtotal = 0;

	int seconds;

	subtotal += usec;

	if (subtotal < 1000000) return TCL_OK;

	seconds = subtotal/1000000;

	subtotal = subtotal%1000000;

 restart:

	if (Tcl_AsyncReady()) {

		int rc = Tcl_AsyncInvoke(interp,TCL_OK);

		if (rc != TCL_OK) return(exp_tcl2_returnvalue(rc));

	}

	sleep(seconds);

	return TCL_OK;

}

#endif /*0*/

/* set things up for later calls to event handler */

void

exp_init_event()

{

	exp_event_exit = 0;

}