/* ==== machdep.c ============================================================
 * Copyright (c) 1993, 1994 Chris Provenzano, proven@athena.mit.edu
 *
 * Description : Machine dependent functions for SunOS-4.1.3 on sparc
 *
 *	1.00 93/08/04 proven
 *      -Started coding this file.
 */

#ifndef lint
static const char rcsid[] = "$Id: engine-sparc-sunos-5.3.c,v 1.6 1995/02/11 03:46:15 proven Exp $";
#endif
 
#include <errno.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/procset.h>
#include <sys/systeminfo.h>
#include <poll.h>

/* ==========================================================================
 * machdep_save_state()
 */
int machdep_save_state(void)
{
	/* Save register windows onto stackframe */
	__asm__ ("ta 3");

    return(setjmp(pthread_run->machdep_data.machdep_state));
}

/* ==========================================================================
 * machdep_restore_state()
 */
void machdep_restore_state(void)
{
    longjmp(pthread_run->machdep_data.machdep_state, 1);
}

/* ==========================================================================
 * machdep_set_thread_timer()
 */
void machdep_set_thread_timer(struct machdep_pthread *machdep_pthread)
{
    if (setitimer(ITIMER_VIRTUAL, &(machdep_pthread->machdep_timer), NULL)) {
        PANIC();
    }
}

/* ==========================================================================
 * machdep_unset_thread_timer()
 */
void machdep_unset_thread_timer(struct machdep_pthread *machdep_pthread)
{
    struct itimerval zeroval = { { 0, 0 }, { 0, 0} };

    if (setitimer(ITIMER_VIRTUAL, &zeroval, NULL)) {
        PANIC();
    }
}

/* ==========================================================================
 * machdep_pthread_cleanup()
 */
void *machdep_pthread_cleanup(struct machdep_pthread *machdep_pthread)
{
    return(machdep_pthread->machdep_stack);
}

/* ==========================================================================
 * machdep_pthread_start()
 */
void machdep_pthread_start(void)
{
	context_switch_done();
	pthread_sched_resume();

    /* Run current threads start routine with argument */
    pthread_exit(pthread_run->machdep_data.start_routine
      (pthread_run->machdep_data.start_argument));

    /* should never reach here */
    PANIC();
}

/* ==========================================================================
 * machdep_pthread_create()
 */
void machdep_pthread_create(struct machdep_pthread *machdep_pthread,
  void *(* start_routine)(), void *start_argument, long stack_size,
  void *stack_start, long nsec)
{
    machdep_pthread->machdep_stack = stack_start;

    machdep_pthread->start_routine = start_routine;
    machdep_pthread->start_argument = start_argument;

    machdep_pthread->machdep_timer.it_value.tv_sec = 0;
    machdep_pthread->machdep_timer.it_interval.tv_sec = 0;
    machdep_pthread->machdep_timer.it_interval.tv_usec = 0;
    machdep_pthread->machdep_timer.it_value.tv_usec = nsec / 1000;

	/* Save register windows onto stackframe */
	__asm__ ("ta 3");

	if (setjmp(machdep_pthread->machdep_state)) {
		machdep_pthread_start();
	}

    /*
     * Set up new stact frame so that it looks like it
     * returned from a longjmp() to the beginning of
     * machdep_pthread_start().
     */

   	/* Sparc stack starts high and builds down. */
    machdep_pthread->machdep_state[1] =
	  (int)machdep_pthread->machdep_stack + stack_size - 1024; 
	machdep_pthread->machdep_state[1] &= ~7;

}

/* ==========================================================================
 * machdep_sys_getdirentries()
 */
int machdep_sys_getdirentries(int fd, char * buf, int len, int * seek)
{
	return(machdep_sys_getdents(fd, buf, len));
}

/* ==========================================================================
 * machdep_sys_wait3()
 */
machdep_sys_wait3(int * b, int c, int * d)
{
	return(-ENOSYS);
    /*    return(machdep_sys_wait4(0, b, c, d)); */
}

/* ==========================================================================
 * machdep_sys_waitpid()
 */
machdep_sys_waitpid(int a, int * b, int c)
{
	idtype_t id;

	switch (a) {
	case -1:
		id = P_ALL;
		break;
	case 0:
		a = machdep_sys_pgrpsys(0);
		id = P_PGID;
		break;
	default:
		if (a < 0) {
			id = P_PGID;
			a = -a;
		} else {
			id = P_PID;
		}
		break;
	}
		
	return(machdep_sys_waitsys(id, a, b, c));
}

/* ==========================================================================
 * machdep_sys_dup2()
 */
machdep_sys_dup2(int a, int b)
{
	machdep_sys_close(b);
	machdep_sys_fcntl(a, F_DUPFD, b);
}

/* ==========================================================================
 * machdep_sys_select()
 */
machdep_sys_select(int nfds, fd_set *readfds, fd_set *writefds, 
  fd_set *exceptfds, struct timeval *timeout)
{
	struct pollfd fds[64];
	fd_set bogus_fds;
	int i, j, k;

	/* Make sure each arg has a valid pointer */
	if ((readfds == NULL) || (writefds == NULL) || (exceptfds == NULL)) {
		if (exceptfds == NULL) {
			exceptfds = &bogus_fds;
		}
		if (writefds == NULL) {
			writefds = &bogus_fds;
		}
		if (readfds == NULL) {
			readfds = &bogus_fds;
		}
		FD_ZERO((&bogus_fds));
	} 

	k = timeout->tv_usec / 1000 + timeout->tv_sec * 1000;
	for (i = 0, j = 0; i < nfds; i++) {
		fds[j].events = 0;
		if (FD_ISSET(i, readfds)) {
			fds[j].events |= POLLIN;
		}
		if (FD_ISSET(i, writefds)) {
			fds[j].events |= POLLOUT;
		}
		if (fds[j].events) {
			fds[j].fd = i;
			j++;
		}
	}

	if (i = machdep_sys_poll(fds, j, k) <= 0) {
		return(i);
	}
		
	FD_ZERO(readfds);
	FD_ZERO(writefds);
	FD_ZERO(exceptfds);
	for (i = 0, k = 0; i < j; i++) {
		if (fds[i].revents & POLLIN) {
			FD_SET(fds[i].fd, readfds);
		}
		if (fds[i].revents & POLLOUT) {
			FD_SET(fds[i].fd, writefds);
		}
		if (fds[i].revents) {
			k++;
		}
	}
	return(k);
}

/* ==========================================================================
 * machdep_sys_getdtablesize()
 */
machdep_sys_getdtablesize()
{
	return(sysconf(_SC_OPEN_MAX));
}

/* ==========================================================================
 * getpagesize()
 */
getpagesize()
{
	return(sysconf(_SC_PAGESIZE));
}

/* ==========================================================================
 * gethostname()
 */
int gethostname(char * name, int namelen)
{
	return(sysinfo(SI_HOSTNAME, name, namelen));
}