/*****************************************************************************
 * FILE: sysemx.c							     *
 *									     *
 * DESC:								     *
 *	- int 0x21 32 bit handler					     *
 *	- int 0x21 emx syscall handler					     *
 *									     *
 * Copyright (C) 1993,1994						     *
 *	Rainer Schnitker, Heeper Str. 283, 33607 Bielefeld		     *
 *	email: rainer@mathematik.uni-bielefeld.de			     *
 *									     *
 *****************************************************************************/

#include <string.h>
#include <malloc.h>
#include "DPMI.H"
#include "PRINTF.H"
#include "RMLIB.H"
#include "TIMEDOS.H"
#include "PROCESS.H"
#include "SIGNALS.H"
#include "GNUAOUT.H"
#include "START32.H"
#include "CDOSX32.H"
#include "COPY32.H"
#include "EXCEP32.H"
#include "RSX.H"
#include "STATEMX.H"
#include "PTRACE.H"
#include "LOADPRG.H"
#include "TERMIO.H"
#include "DOSERRNO.H"

#define CONVERT1_BX_HANDLE		\
	int h = get_dos_handle(BX);	\
	if (h < 0) {			\
	    EAX = EMX_EBADF;		\
	    return CARRY_ON;		\
	}				\
	else BX = h;

#define CONVERT2_BX_HANDLE		\
	int h = get_dos_handle(BX);	\
	if (h < 0) {			\
	    set_ecx_error(EMX_EBADF);	\
	    return CARRY_ON;		\
	}				\
	else BX = h;

static DWORD can_run_emx = 0x302e3961;	/* ascii = 0.9a */

static int time_reached(unsigned long time)
{
    if (time <= time_tic)
	return 1;
    else
	return 0;
}

static void set_ecx_error(int err)
{
    EAX = -1L;
    if (npz->p_flags & PF_DJGPP_FILE)
	err = errno_djgpp(err);
    ECX = (long) err;
}

static void set_no_error(void)
{
    EAX = ECX = 0L;
}

static void set_eax_return(DWORD reg_eax)
{
    EAX = reg_eax;
    ECX = 0L;
}

/*
** SYSEMX functions returns:
**
** CARRY_ON :	error, set carry-bit
** CARRY_OFF:	no error, clear carry-bit
** CARRY_NON:	do nothing
*/

/* oldbrk_eax sbrk(inc_edx) ; err:eax=-1 */
static int sys_emx00_sbrk(void)
{
    EAX = getmem(EDX, npz);
    return CARRY_NON;
}

/* eax=0 brk(newbrk_edx) ; err:eax=-1 */
static int sys_emx01_brk(void)
{
    if (EDX <= npz->brk_value)
	EAX = -1L;
    else if ((EAX = getmem(EDX - npz->brk_value, npz)) != -1L)
	EAX = 0L;
    return CARRY_NON;
}

/* maxbrk_eax ulimit(cmd_ecx,newlimit_edx) errno:ecx */
static int sys_emx02_ulimit(void)
{
    if (ECX == 3L) {
	FREEMEMINFO fm;
	GetFreeMemInfo(&fm);
	set_eax_return(fm.LargestFree + npz->brk_value);
    } else
	set_ecx_error(EMX_EINVAL);
    return CARRY_NON;
}

/* emx special: void vmstat() */
static int sys_emx03_vmstat(void)
{
    return CARRY_NON;
}

/* eax=filepermmask umask(edx) ; err:- */
static int sys_emx04_umask(void)
{
    EAX = EDX;
    return CARRY_NON;
}

/* eax getpid(void) err:- */
static int sys_emx05_getpid(void)
{
    EAX = (DWORD) npz->pid;
    return CARRY_NON;
}

/*
** eax = spawnve(proc_env *edx) err:carry errno:eax
*/
static int sys_emx06_spawn(void)
{
    int i, ret;
    PROCESS_ENV pe;
    static char filename[260];
    char **argp = NULL, **envp = NULL;
    char *envmem = NULL, *argmem = NULL;
    char *s;

    /* get process data, check mode */
    cpy32_16(DS, EDX, &pe, (DWORD) sizeof(PROCESS_ENV));
    pe.mode &= 0xff;
    if (pe.mode >= P_SESSION) {     /* OS/2 modes */
	EAX = EMX_EINVAL;
	return CARRY_ON;
    }

    /* get memory for args and environment (env must para aligned) */
    if ((argp = (char **) malloc((pe.arg_count + 1) * sizeof(char *))) == NULL
	|| (envp = (char **) malloc((pe.env_count + 1) * sizeof(char *))) == NULL
	|| (argmem = (char *) malloc((pe.arg_size + 1) & ~1)) == NULL
	|| (envmem = (char *) malloc((pe.env_size + 20) & ~1)) == NULL
	) {
	printf("argmem,envmem to large a:%d e:%d\n", pe.arg_size, pe.env_size);
	if (argp != NULL)
	    free(argp);
	if (envp != NULL)
	    free(envp);
	if (argmem != NULL)
	    free(argmem);
	if (envmem != NULL)
	    free(envmem);
	EAX = EMX_E2BIG;
	return CARRY_ON;
    }

    /* get args from user ds, built arg-vector */
    cpy32_16(DS, pe.arg_off, argmem, (DWORD) pe.arg_size);
    s = argmem;
    for (i = 0; i < (int) pe.arg_count; i++) {
	s++;					/* skip flag bits */
	argp[i] = s;
	s += (strlen(argp[i]) + 1);
    }
    argp[i] = NULL;

    /* get env from user ds, built env-vector */
    s = (char *) (((int)envmem + 15) & ~15);	/* segment align */
    cpy32_16(DS, pe.env_off, s, (DWORD) pe.env_size);
    s[pe.env_size] = 0; 			/* for dos exec */
    s[pe.env_size+1] = 0;

    for (i = 0; i < (int) pe.env_count; i++) {
	envp[i] = s;
	s += (strlen(envp[i]) + 1);
    }
    envp[i] = NULL;

    /* get filename */
    strcpy32_16(DS, pe.fname_off, filename);

    /* load a.out prg */
    ret = exec32(pe.mode, filename, pe.arg_count, argp, pe.env_count, envp);

    /* if error, try a real-mode prg */
    if (ret == EMX_ENOEXEC) {
	ret = realmode_prg(filename, argp, envp);
	if (pe.mode == P_OVERLAY && ret != -1)
	    do_exit4c(0);     /* close current emx program */
    }
    free(argmem);
    free(envmem);
    free(argp);
    free(envp);

    /* check error and return */
    if (ret) {
	EAX = (DWORD) ret;
	return CARRY_ON;
    } else
	return CARRY_OFF;
}

static int sys_emx07_sigreturn(void)
{
    signal_handler_returned();
    return CARRY_NON;
}

/* eax ptrace(ebx,edi,edx,ecx) err:ecx!=0 eax=-1 */
static int sys_emx08_ptrace(void)
{
    int error;
    DWORD data;

    if ((error = do_ptrace(BX, DI, EDX, ECX, &data)) != 0)
	set_ecx_error(error);
    else
	set_eax_return(data);
    return CARRY_NON;
}

/* eax=child_id wait(status_edx) ; errno:ecx */
static int sys_emx09_wait(void)
{
    int ret;
    unsigned status;

    if ((ret = sys_wait(&status)) != -1) {
	EDX = (DWORD) status;
	set_eax_return((DWORD) (unsigned) ret);
    } else
	set_ecx_error(EMX_ESRCH);
    return CARRY_NON;
}

#define RUN_VCPI	0x0001L
#define RUN_XMS 	0x0002L
#define RUN_VDISK	0x0004L
#define RUN_DESQVIEW	0x0008L
#define RUN_287 	0x0010L
#define RUN_387 	0x0020L
#define RUN_486 	0x0040L
#define RUN_DPMI09	0x0080L
#define RUN_DPMI10	0x0100L
#define RUN_OS2 	0x0200L
#define RUN_T_OPT	0x0400L
#define RUN_AC_OPT	0x0800L
#define RUN_RSX 	0x1000L

/* get emx-version ; err:- */
static int sys_emx0a_version(void)
{
    DWORD run_info;

    run_info = RUN_RSX | RUN_AC_OPT;	  /* RSX | data executable bit */
    if (copro)
	run_info |= RUN_387;	/* with emu */
    if (dpmi10)
	run_info |= RUN_DPMI10;
    else
	run_info |= RUN_DPMI09;

    /* enable gcc -pipe for emx 0.8x */
    if (opt_os2)
	run_info |= RUN_OS2;

    EAX = can_run_emx;
    EBX = run_info;
    ECX = 0L;
    EDX = 0L;
    return CARRY_NON;
}

/* eax_pages memavail(void) ; err:- */
static int sys_emx0b_memavail(void)
{
    FREEMEMINFO fm;

    GetFreeMemInfo(&fm);
    EAX = fm.MaxUnlockedPages;
    return CARRY_NON;
}

/* (*prevh) signal(signo_ecx,address_edx) err:eax=-1 */
static int sys_emx0c_signal(void)
{
    EAX = sys_signal ((int)ECX, EDX);
    return CARRY_NON;
}

/* eax=0 kill(id_edx,signo_ecx) errno:ecx eax=-1 */
static int sys_emx0d_kill(void)
{
    NEWPROCESS *p;

    if (!(p = find_process((unsigned) EDX))) {
	set_ecx_error(EMX_ESRCH);
	return CARRY_NON;
    } else if (send_signal(p, (int) (long) ECX)) {
	set_ecx_error(EMX_EINVAL);
	return CARRY_NON;
    } else
	set_no_error();

    /* switch, if child */
    if (p->pptr->pid == npz->pid) {
	p->p_status = PS_RUN;
	switch_context(p);
    }
    return CARRY_NON;
}

/* eax raise(ecx) errno:ecx eax=-1 */
static int sys_emx0e_raise(void)
{
    if (send_signal(npz, CX))
	set_ecx_error(EMX_EINVAL);
    return CARRY_NON;
}

/* oldflags uflags(mask=ecx,new=edx) ;; bits 0-1 emx,SysV,BSD signals */
static int sys_emx0f_uflags(void)
{
    EAX = npz->uflags;
    npz->uflags &= ~ECX;
    npz->uflags |= EDX;
    return CARRY_NON;
}

/* void unwind(void) err:no */
static int sys_emx10_unwind(void)
{
    return CARRY_NON;
}

/* core(handle_ebx) err:carry errno */
static int sys_emx11_core(void)
{
    CONVERT1_BX_HANDLE ;

    write_core(BX, npz);
    EAX = 0;
    return CARRY_OFF;
}

/* portaccess(ecx,edx) ecx=first edx=last, err:cy errno:eax */
static int sys_emx12_portaccess(void)
{
    /* dpmi-server must allow this */
    ECX = 0L;			/* first port */
    EDX = 0x3ffL;		/* last port */
    EAX = 0L;
    return CARRY_OFF;
}

/* eax memaccess(Start=ebx,End=ecx,Flags=edx) err:carry errno:eax */
/* under DPMI it's better to used a different segment */
/* memaccess destroy protection -> limit 0xffffffff */
/* must use wrap-around to access memory */

static int sys_emx13_memaccess(void)
{
    if ((opt_memaccess || (npz->options & OPT_MEMACCESS))
	&& EBX <= 0xFFFFFL && ECX <= 0xFFFFFL) {

	if (!dpmi10) {
	    /*
	    UINT sel;
	    DWORD screen_base;

	    if (SegToSel((UINT)(EBX >> 4), &sel))
		screen_base = EBX;
	    else
		GetBaseAddress(sel, &screen_base);
	    EAX = screen_base - npz->memaddress;
	    */
	    EAX = EBX - npz->memaddress;
	}
	else
	    EAX = EBX + DPMI_PRG_DATA;
	return CARRY_OFF;
    } else {
	EAX = EMX_EINVAL;
	return CARRY_ON;
    }
}


int sysemx_ioctl(int dos_handle, ARGUSER request, ARGUSER arg)
{
    int attr, ret;

    if ((attr = rm_ioctl_getattr(dos_handle)) == -1)
	return -EMX_EBADF;

    if (request >= TCGETA && request <= TCFLSH) {
	if (dos_handle == 0 && (attr & 128)) {	    /* keyboard handle */
	    return kbd_ioctl((unsigned)request, arg);
	} else					    /* others not supported */
	    return -EMX_EBADF;
    }
    else if (request == FIONREAD) {
	if (dos_handle == 0 && (attr & 128) && (npz->p_flags & PF_TERMIO))
	    ret = kbd_ioctl((unsigned)request, arg);
	else {				    /* others: 1=ready 0=not */
	    ret = rm_ioctl_select_in(dos_handle);
	    store32(npz->data32sel, arg, (long) ret);
	    ret = 0;
	}
	return ret;
    }
    else if (request == FGETHTYPE) {
	long temp;
	if (!(attr & 128))
	    temp = HT_FILE;
	else if (attr & 3)
	    temp = HT_DEV_CON;
	else if (attr & 4)
	    temp = HT_DEV_NUL;
	else if (attr & 8)
	    temp = HT_DEV_CLK;
	else
	    temp = HT_DEV_OTHER;
	store32(DS, arg, temp);
	return 0;
    }
    else
	return -EMX_EINVAL;
}

/*
** eax = ioctl2(ebx,ecx,edx) errno:ecx eax=-1
*/
static int sys_emx14_ioctl(void)
{
    int ret = sys_ioctl((int)EBX, ECX, EDX);

    if (ret < 0)
	set_ecx_error(-ret);
    else
	set_eax_return(ret);
    return CARRY_NON;
}

/* eax=sec alarm(sec_edx) err:no */
static int sys_emx15_alarm(void)
{
    if (time_tic < npz->time_alarm)	/* there seconds left */
	EAX = (npz->time_alarm - time_tic) * 182 / 10;
    else
	EAX = 0;

    if (EDX == 0)		/* clear alarm */
	npz->time_alarm = 0;
    else			/* set alarm */
	npz->time_alarm = time_tic + EDX * 182 / 10;
    return CARRY_NON;
}

/* no syscall; internal */
static int sys_emx16_internal(void)
{
    return CARRY_NON;
}

/*
** return ramaining clock tics
*/
static DWORD sleep_until(DWORD timel)
{
    for (;;) {
	if (time_reached(timel))
	    return 0;
	if (npz->sig_raised & ~npz->sig_blocked)
	    return (timel - time_tic - 1);
	schedule();
    }
}

/* eax=0 sleep(edx) err:no */
static int sys_emx17_sleep(void)
{
    EAX = sleep_until(time_tic + EDX * 182 / 10) * 10 / 182;
    return CARRY_NON;
}

/*
** chsize(handle_ebx, lenght_edx) err:carry eax=errno
*/
static int sys_emx18_chsize(void)
{
    CONVERT1_BX_HANDLE;

    if (rm_lseek(BX, EDX, SEEK_SET) == -1L || rm_write(BX, iobuf, 0) == -1) {
	EAX = (DWORD) doserror_to_errno(_doserrno);
	return CARRY_ON;
    }
    EAX = 0;
    return CARRY_OFF;
}

/* eax fcntl(handle ebx,req ecx,arg edx) errno:ecx */
static int sys_emx19_fcntl(void)
{
    int fd = (int) (long) EBX;
    struct file *filp;

    if (fd >= N_FILES)
	return -EMX_EBADF;
    if (!(filp = npz->filp[fd]))
	return -EMX_EBADF;

    switch ((int)(long)ECX) {
	case F_GETFL:
	    set_eax_return(filp->f_flags);
	    break;
	case F_SETFL:
	    filp->f_flags &= ~(FCNTL_NDELAY | FCNTL_APPEND);
	    filp->f_flags |= EDX & (FCNTL_NDELAY | FCNTL_APPEND);
	    set_no_error();
	    break;
	case F_GETFD:
	    set_eax_return(FD_ISSET(fd, &npz->close_on_exec));
	    break;
	case F_SETFD:
	    if (EDX & 1)
		FD_SET(fd, &npz->close_on_exec);
	    else
		FD_CLR(fd, &npz->close_on_exec);
	    set_no_error();
	    break;
	default:
	    set_ecx_error(EMX_EINVAL);
	    break;
    }
    return CARRY_NON;
}

/* eax pipe(edx,ecx) errno:ecx*/
static int sys_emx1a_pipe(void)
{
    int ret = sys_pipe(ECX, EDX);

    if (ret)
	set_ecx_error(-ret);
    else
	set_no_error();
    return CARRY_NON;
}

/* eax fsync(ebx) errno:ecx */
static int sys_emx1b_fsync(void)
{
    set_ecx_error(EMX_EMSDOS);
    return CARRY_NON;
}

/* eax fork(void) errno:ecx */
static int sys_emx1c_fork(void)
{
    int ret;

    if ((ret = sys_fork()) < 0)
	set_ecx_error(-ret);
    else
	set_eax_return(ret);
    return CARRY_NON;
}

/* void scrsize(EDX) */
static int sys_emx1d_scrsize(void)
{
    store32(DS, EDX + 0L, read32(bios_selector, 0x4AL) & 0xFFFFL);
    store32(DS, EDX + 4L, (read32(bios_selector, 0x84L) & 0xFFL) + 1L);
    return CARRY_NON;
}

int sysemx_select(int dos_handle, DWORD tics)
{
    int is_termio_handle = 0;
    DWORD time_end = time_tic + tics;

    if (dos_handle == 0 && rm_isatty(dos_handle) && (npz->p_flags & PF_TERMIO))
	is_termio_handle = 1;

    for (;;) {
	if (is_termio_handle) {
	    if (rm_bios_read_keybrd(kready))
		return 1;
	}
	if (rm_ioctl_select_in(dos_handle))
	    return 1;

	if (tics != 0xFFFFFFFF && time_reached(time_end))
	    return 0;
    }
}

/* void select(edx) errno:ecx */
static int sys_emx1e_select(void)
{
    int ret = sys_select(EDX);

    if (ret < 0)
	set_ecx_error(-ret);
    else
	set_eax_return(ret);
    return CARRY_NON;
}

/* eax syserrno(void) */
static int sys_emx1f_syserrno(void)
{
    EAX = doserror_to_errno(_doserrno);
    return CARRY_NON;
}

/*
** eax stat(name_edx,struc_edi) errno:ecx
*/
static int sys_emx20_stat(void)
{
    struct stat st;

    strcpy32_16(DS, EDX, iobuf);
    if (!sys_stat(iobuf, &st)) {
	cpy16_32(DS, EDI, &st, sizeof(st));
	set_no_error();
    } else
	set_ecx_error(doserror_to_errno(_doserrno));
    return CARRY_NON;
}

/*
** eax fstat(ebx, edi) errno:ecx
*/
static int sys_emx21_fstat(void)
{
    struct stat st;

    CONVERT2_BX_HANDLE;

    if (!sys_fstat(BX, &st)) {
	cpy16_32(DS, EDI, &st, sizeof(st));
	set_no_error();
    } else
	set_ecx_error(doserror_to_errno(_doserrno));
    return CARRY_NON;
}

static int sys_emx22_unused(void)
{
    return CARRY_NON;
}

/* filesys(edx,edi,ecx) errno:ecx */
static int sys_emx23_filesys(void)
{
    char drive[4];
    char *res;
    int ret;

    *(DWORD *) drive = read32(DS, EDX);
    if (drive[0] >= 'a')
	drive[0] -= 0x20;
    if (drive[0] < 'A' || drive[0] > 'Z' || drive[1] != ':' || drive[2] != 0) {
	set_ecx_error(EMX_EINVAL);
	return -1;
    }
    drive[0] -= ('A' - 1);
    ret = rm_ioctl_remotedrive(drive[0]);
    if (ret == 1)
	res = "LAN";
    else
	res = "FAT";
    strcpy16_32(DS, EDI, res);
    set_no_error();
    return CARRY_NON;
}

/* eax utimes(name_edx,struct tval esi) errno:ecx */
/* set access and modif time of file  */
static int sys_emx24_utimes(void)
{
    struct file_time ft;
    DWORD utimes[2];
    int handle;

    strcpy32_16(DS, EDX, iobuf);
    cpy32_16(DS, ESI, utimes, sizeof(utimes));

    if ((handle = rm_open(iobuf, RM_O_WRONLY)) == -1) {
	set_ecx_error(doserror_to_errno(_doserrno));
	return CARRY_NON;
    }
    gmt2filetime(utimes[0], &ft);
    if (rm_setftime(handle, ft.ft_date, ft.ft_time) == -1)
	set_ecx_error(doserror_to_errno(_doserrno));
    else
	set_eax_return(0);
    rm_close(handle);
    return CARRY_NON;
}

/* eax ftruncate(ebx,edx) errno:ecx */
static int sys_emx25_ftruncate(void)
{
    long temp;

    CONVERT2_BX_HANDLE;

    if ((temp = rm_lseek(BX, 0, SEEK_END)) == -1) {
	set_ecx_error(doserror_to_errno(_doserrno));
	return CARRY_NON;
    } else if (temp > (long) EDX) {
	if (rm_lseek(BX, EDX, SEEK_SET) == -1 || rm_write(BX, iobuf, 0) == -1) {
	    set_ecx_error(doserror_to_errno(_doserrno));
	    return CARRY_NON;
	}
    }
    set_no_error();
    return CARRY_NON;
}

/* eax clock(void) err:no */
static int sys_emx26_clock(void)
{
    /* clk_tck = 100 ; timer 18.2 pre sec */
    EAX = (time_tic - npz->time_tic) * 500 / 91;
    EDX = 0;
    return CARRY_NON;
}

/* void ftime(edx) err:no */
static int sys_emx27_ftime(void)
{
    struct emx_timeb {
	long time, millitm, timezone, dstflag;
    } emx_timeb;
    struct dos_date dd;
    struct dos_time dt;
    unsigned long gmt;

    rm_getdate(&dd);
    rm_gettime(&dt);
    gmt = dos2gmt(&dd, &dt);

    emx_timeb.time = gmt;
    emx_timeb.millitm = (DWORD) dt.dtime_hsec * 10;
    emx_timeb.timezone = 0;
    emx_timeb.dstflag = 0;

    cpy16_32(DS, EDX, &emx_timeb, sizeof(emx_timeb));
    return CARRY_NON;
}

/* eax umask(edx) err:no */
static int sys_emx28_umask(void)
{
    EAX = EDX;
    return CARRY_NON;
}

/* eax getppid(void) err:no */
static int sys_emx29_getppid(void)
{
    EAX = (DWORD) npz->pptr->pid;
    return CARRY_NON;
}

/* void nls_menupr(buf edx,size ecx) err:no */
/* buffer to upper case */
static int sys_emx2a_nlsmemupr(void)
{
    return CARRY_NON;
}

/*
**  eax open(edx, ecx) errno:ecx
**
**  pathname <= sizeof(iobuf) !
**  creat: CH = creat file attr
**  open:  CL = access & sharing mode
*/

typedef int (*OPENFUNC) (char *, WORD);

static int sys_emx2b_open(void)
{
    int i, dosfile, handle;
    OPENFUNC openfn;
    WORD p2;

    strcpy32_16(DS, EDX, iobuf);

    /* replace unix names */
    if (strcmp("/dev/null", iobuf) == 0)
	strcpy(iobuf, "nul");
    else if (strcmp("/dev/tty", iobuf) == 0)
	strcpy(iobuf, "con");

    i = (int) (ECX >> 16);	/* 1 = O_CREAT, 2 = O_EXCL, 4 = O_TRUNC */
				/* 8 = O_INHERIT, 16 = SYNC */

    if (i & 0x01) {
	if (i & 0x02)		/* O_CREAT | O_EXCL */
	    openfn = rm_creatnew;
	else if (i & 4) 	/* O_CREAT | O_TRUNC */
	    openfn = rm_creat;
	else if (rm_access(iobuf, 0) == -1)	/* old file there ? */
	    openfn = rm_creat;
	else
	    openfn = rm_open;
    } else			/* not O_CREAT */
	openfn = rm_open;

    if (openfn == rm_open)
	p2 = CX & 0xff; 	/* open mode */
    else
	p2 = CX >> 8;		/* creat attrib */

    dosfile = (*openfn) (iobuf, p2);

    if (dosfile == -1)
	set_ecx_error(doserror_to_errno(_doserrno));
    else {
	if ((i & 0x05) == 0x4) {    /* O_TRUNC with open */
	    if (rm_lseek(dosfile, 0, SEEK_SET) == -1L
		|| rm_write(dosfile, iobuf, 0) == -1) {
		set_ecx_error(doserror_to_errno(_doserrno));
		return CARRY_NON;
	    }
	}
	handle = get_empty_proc_filp();
	npz->filp[handle]->f_mode = FMODE_READ | FMODE_WRITE;
	npz->filp[handle]->f_doshandle = dosfile;
	npz->filp[handle]->f_op = & msdos_fop;
	if (i & 16)  /* inherit file handle */
	    FD_CLR(handle, &npz->close_on_exec);
	set_eax_return(handle);
    }
    return CARRY_NON;
}

/* eax newthread(edx) errno:ecx */
static int sys_emx2c_newthread(void)
{
    set_ecx_error(EMX_EMSDOS);
    return CARRY_NON;
}

/* eax endthread(void) errno:ecx */
static int sys_emx2d_endthread(void)
{
    set_ecx_error(EMX_EMSDOS);
    return CARRY_NON;
}

/* waitpid(pid_edx, options_ecx) ret: eax,ecx edx=status*/
static int sys_emx2e_waitpid(void)
{
    if (!opt_schedule)
	set_ecx_error(EMX_EMSDOS);
    else {
	int ret;
	unsigned status;
	if ((ret = sys_waitpid((int)EDX, &status)) >= 0) {
	    EDX = (DWORD) status;
	    set_eax_return((DWORD) (unsigned) ret);
	} else
	    set_ecx_error(EMX_ESRCH);
    }
    return CARRY_NON;
}

static int sys_emx2f_readkbd()
{
    static unsigned char next_key = 0;
    int key;
    unsigned char ascii, scan;

    if (next_key) {
	EAX = (DWORD) next_key;
	next_key = 0;
	return CARRY_NON;
    }
    if (DX & 2) {		/* wait */
	while (rm_bios_read_keybrd(kready))
	    rm_bios_read_keybrd(kread);
	key = rm_bios_read_keybrd(kread);
    } else if ((key = rm_bios_read_keybrd(kready)) != 0)
	key = rm_bios_read_keybrd(kread);
    else {
	EAX = -1;
	return CARRY_NON;
    }

    ascii = (BYTE) (key & 0xFF);
    scan = (BYTE) (key >> 8);

    if (ascii == 0xE0)
	ascii = 0;

    if (ascii == 0)
	next_key = scan;

    if (DX & 1) 		/* echo */
	if (ascii >= 32)
	    /* change to: sys_write() */
	    rm_write((int) npz->filp[1]->f_doshandle, &ascii, 1);

    if ((DX & 4) && ascii == 3) /* signal */
	send_signal(npz, SIGINT);

    EAX = (DWORD) (ascii);

    return CARRY_NON;
}

/* sleep2 ; err:-*/
static int sys_emx30_sleep2(void)
{
    sleep_until(time_tic + EDX / 55);
    EAX = 0;
    return CARRY_NON;
}

/* void unwind2(); not DOS */
static int sys_emx31_unwind2(void)
{
    return CARRY_NON;
}

/* void pause(); err: eax=-1, return until signal handler */
static int sys_emx32_pause(void)
{
    for (;;) {
	if (npz->sig_raised & ~npz->sig_blocked) {
	    EAX = 0;
	    break;
	}
	if (!schedule()) {     /* no other processes */
	    EAX = -1L;
	    break;
	}
    }
    return CARRY_NON;
}

/* int execname(edx=buf, ecx=size); err=-1 */
static int sys_emx33_execname(void)
{
    DWORD pos = read32(npz->data32sel, npz->stack_top - 8L);
    DWORD len = read32(npz->data32sel, npz->stack_top - 12L);

    if (ECX < len || verify_illegal(npz, EDX, len)
	    || verify_illegal(npz, pos, len)) {
	EAX = -1;
	return CARRY_NON;
    }
    cpy32_32(npz->data32sel, pos, npz->data32sel, EDX,	npz->stack_top - pos);
    EAX = 0;
    return CARRY_NON;
}

/* int initthread() ; not DOS */
static int sys_emx34_initthread(void)
{
    EAX = -1;
    return CARRY_NON;
}

/* int sigaction(no ECX, in EDX, out EBX) */
static int sys_emx35_sigaction(void)
{
    int err = sys_sigaction((int)ECX, EDX, EBX);
    if (err < 0)
	set_ecx_error(-err);
    else
	set_eax_return(err);
    return CARRY_NON;
}

/* int sigpending(in EDX) */
static int sys_emx36_sigpending(void)
{
    int err = sys_sigpending(EDX);
    if (err < 0)
	set_ecx_error(-err);
    else
	set_eax_return(err);
    return CARRY_NON;
}

/* int sigprocmask(how ECX, in EDX, out EBX) */
static int sys_emx37_sigprocmask(void)
{
    int err = sys_sigprocmask((int)ECX, EDX, EBX);
    if (err < 0)
	set_ecx_error(-err);
    else
	set_eax_return(err);
    return CARRY_NON;
}

/* int sigsuspend(sigset_t EDX) */
static int sys_emx38_sigsuspend(void)
{
    set_ecx_error(EMX_EMSDOS);
    return CARRY_NON;
}

/* os/2 only */
static int sys_emx39_imphandle(void)
{
    set_ecx_error(EMX_EMSDOS);
    return CARRY_NON;
}

#define EMX_FNCT_MAX 0x40
typedef int (*EMXFNCT) (void);

static EMXFNCT emx_fnct[EMX_FNCT_MAX] =
{
    sys_emx00_sbrk,
    sys_emx01_brk,
    sys_emx02_ulimit,
    sys_emx03_vmstat,
    sys_emx04_umask,
    sys_emx05_getpid,
    sys_emx06_spawn,
    sys_emx07_sigreturn,
    sys_emx08_ptrace,
    sys_emx09_wait,
    sys_emx0a_version,
    sys_emx0b_memavail,
    sys_emx0c_signal,
    sys_emx0d_kill,
    sys_emx0e_raise,
    sys_emx0f_uflags,
    sys_emx10_unwind,
    sys_emx11_core,
    sys_emx12_portaccess,
    sys_emx13_memaccess,
    sys_emx14_ioctl,
    sys_emx15_alarm,
    sys_emx16_internal,
    sys_emx17_sleep,
    sys_emx18_chsize,
    sys_emx19_fcntl,
    sys_emx1a_pipe,
    sys_emx1b_fsync,
    sys_emx1c_fork,
    sys_emx1d_scrsize,
    sys_emx1e_select,
    sys_emx1f_syserrno,
    sys_emx20_stat,
    sys_emx21_fstat,
    sys_emx22_unused,
    sys_emx23_filesys,
    sys_emx24_utimes,
    sys_emx25_ftruncate,
    sys_emx26_clock,
    sys_emx27_ftime,
    sys_emx28_umask,
    sys_emx29_getppid,
    sys_emx2a_nlsmemupr,
    sys_emx2b_open,
    sys_emx2c_newthread,
    sys_emx2d_endthread,
    sys_emx2e_waitpid,
    sys_emx2f_readkbd,
    sys_emx30_sleep2,
    sys_emx31_unwind2,
    sys_emx32_pause,
    sys_emx33_execname,
    sys_emx34_initthread,
    sys_emx35_sigaction,
    sys_emx36_sigpending,
    sys_emx37_sigprocmask,
    sys_emx38_sigsuspend,
    sys_emx39_imphandle
    /* sys_emx3a_fpu */
};

static int i_21_7f(void)
{
    WORD i = AX & 0xFF;

    /* emx fnct = al */
    if (i < EMX_FNCT_MAX)
	return (emx_fnct[i]) ();
    else {
	set_ecx_error(EMX_EMSDOS);
	if (opt_printall)
	    printf("Warning: unknown emx syscall: %04X\n", i);
	return CARRY_ON;
    }
}

extern int i_21_ff(void);
extern int i_21_fe(void);

void int21(void)
{
    WORD ret;

    if (opt_print_syscalls)
	printf("21h: a=%08X b=%08lX c=%08lX d=%08lX D=%08lX S=%08lX\n"
		, AX, EBX, ECX, EDX, EDI, ESI);

    /* emx functions */
    if ((AX & 0xff00) == 0x7f00)
	ret = i_21_7f();

    /* go32 functions */
    else if ((AX & 0xff00) == 0xff00)
	ret = i_21_ff();

    /* go32 debug */
    else if ((AX & 0xff00) == 0xfe00)
	ret = i_21_fe();

    /* DOS functions */
    else {
	ret = int21normal();
	/* if DOS indicates an error (carry-flag set), convert error code */
	if (ret == CARRY_NON && (FLAGS & 1)) {
	    EAX = (DWORD) doserror_to_errno(AX);
	    ret = CARRY_ON;
	}
    }

    if (ret == CARRY_ON) {
	EFLAGS |= 1;
	if (npz->p_flags & PF_DJGPP_FILE)
	    EAX = (DWORD) errno_djgpp(AX);
    } else if (ret == CARRY_OFF)
	EFLAGS &= ~1L;

    if (opt_print_syscalls)
	printf("   : a=%08lX b=%08lX c=%08lX d=%08lX D=%08lX S=%08lX F:%04X\n"
		, EAX, EBX, ECX, EDX, EDI, ESI, FLAGS);

    if (npz->time_alarm != 0 && time_reached(npz->time_alarm)) {
	npz->time_alarm = 0;
	send_signal(npz, SIGALRM);
    }
    /* stack check */
    if (npz->stack_down + 0x1000L >= ESP) {
	puts("stack too small!!");
	printf("ESP %lX  stack : min %lX max %lX\n",
	       ESP, npz->stack_down, npz->stack_top);
	send_signal(npz, SIGKILL);
    }
}