/*	$OpenBSD: ibcs2_fcntl.c,v 1.9 2002/03/14 01:26:50 millert Exp $	*/
/*	$NetBSD: ibcs2_fcntl.c,v 1.6 1996/05/03 17:05:20 christos Exp $	*/

/*
 * Copyright (c) 1997 Theo de Raadt
 * Copyright (c) 1995 Scott Bartram
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/syscallargs.h>
#include <sys/vnode.h>

#include <compat/ibcs2/ibcs2_types.h>
#include <compat/ibcs2/ibcs2_fcntl.h>
#include <compat/ibcs2/ibcs2_unistd.h>
#include <compat/ibcs2/ibcs2_signal.h>
#include <compat/ibcs2/ibcs2_syscallargs.h>
#include <compat/ibcs2/ibcs2_util.h>

static int cvt_o_flags(int);
static void cvt_flock2iflock(struct flock *, struct ibcs2_flock *);
static void cvt_iflock2flock(struct ibcs2_flock *, struct flock *);
static int ioflags2oflags(int);
static int oflags2ioflags(int);

static int
cvt_o_flags(flags)
	int flags;
{
	int r = 0;

        /* convert mode into NetBSD mode */
	if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
	if (flags & IBCS2_O_RDWR) r |= O_RDWR;
	if (flags & (IBCS2_O_NDELAY | IBCS2_O_NONBLOCK)) r |= O_NONBLOCK;
	if (flags & IBCS2_O_APPEND) r |= O_APPEND;
	if (flags & IBCS2_O_SYNC) r |= O_SYNC;
	if (flags & IBCS2_O_CREAT) r |= O_CREAT;
	if (flags & IBCS2_O_TRUNC) r |= O_TRUNC;
	if (flags & IBCS2_O_EXCL) r |= O_EXCL;
	return r;
}

static void
cvt_flock2iflock(flp, iflp)
	struct flock *flp;
	struct ibcs2_flock *iflp;
{
	switch (flp->l_type) {
	case F_RDLCK:
		iflp->l_type = IBCS2_F_RDLCK;
		break;
	case F_WRLCK:
		iflp->l_type = IBCS2_F_WRLCK;
		break;
	case F_UNLCK:
		iflp->l_type = IBCS2_F_UNLCK;
		break;
	}
	iflp->l_whence = (short)flp->l_whence;
	iflp->l_start = (ibcs2_off_t)flp->l_start;
	iflp->l_len = (ibcs2_off_t)flp->l_len;
	iflp->l_sysid = 0;
	iflp->l_pid = (ibcs2_pid_t)flp->l_pid;
}

static void
cvt_iflock2flock(iflp, flp)
	struct ibcs2_flock *iflp;
	struct flock *flp;
{
	flp->l_start = (off_t)iflp->l_start;
	flp->l_len = (off_t)iflp->l_len;
	flp->l_pid = (pid_t)iflp->l_pid;
	switch (iflp->l_type) {
	case IBCS2_F_RDLCK:
		flp->l_type = F_RDLCK;
		break;
	case IBCS2_F_WRLCK:
		flp->l_type = F_WRLCK;
		break;
	case IBCS2_F_UNLCK:
		flp->l_type = F_UNLCK;
		break;
	}
	flp->l_whence = iflp->l_whence;
}

/* convert iBCS2 mode into NetBSD mode */
static int
ioflags2oflags(flags)
	int flags;
{
	int r = 0;
	
	if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
	if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
	if (flags & IBCS2_O_RDWR) r |= O_RDWR;
	if (flags & IBCS2_O_NDELAY) r |= O_NONBLOCK;
	if (flags & IBCS2_O_APPEND) r |= O_APPEND;
	if (flags & IBCS2_O_SYNC) r |= O_SYNC;
	if (flags & IBCS2_O_NONBLOCK) r |= O_NONBLOCK;
	if (flags & IBCS2_O_CREAT) r |= O_CREAT;
	if (flags & IBCS2_O_TRUNC) r |= O_TRUNC;
	if (flags & IBCS2_O_EXCL) r |= O_EXCL;
	if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
	return r;
}

/* convert NetBSD mode into iBCS2 mode */
static int
oflags2ioflags(flags)
	int flags;
{
	int r = 0;
	
	if (flags & O_RDONLY) r |= IBCS2_O_RDONLY;
	if (flags & O_WRONLY) r |= IBCS2_O_WRONLY;
	if (flags & O_RDWR) r |= IBCS2_O_RDWR;
	if (flags & O_NDELAY) r |= IBCS2_O_NONBLOCK;
	if (flags & O_APPEND) r |= IBCS2_O_APPEND;
	if (flags & O_SYNC) r |= IBCS2_O_SYNC;
	if (flags & O_NONBLOCK) r |= IBCS2_O_NONBLOCK;
	if (flags & O_CREAT) r |= IBCS2_O_CREAT;
	if (flags & O_TRUNC) r |= IBCS2_O_TRUNC;
	if (flags & O_EXCL) r |= IBCS2_O_EXCL;
	if (flags & O_NOCTTY) r |= IBCS2_O_NOCTTY;
	return r;
}

int
ibcs2_sys_open(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct ibcs2_sys_open_args /* {
		syscallarg(char *) path;
		syscallarg(int) flags;
		syscallarg(int) mode;
	} */ *uap = v;
	int noctty = SCARG(uap, flags) & IBCS2_O_NOCTTY;
	int ret;
	caddr_t sg = stackgap_init(p->p_emul);

	SCARG(uap, flags) = cvt_o_flags(SCARG(uap, flags));
	if (SCARG(uap, flags) & O_CREAT)
		IBCS2_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path));
	else
		IBCS2_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
	ret = sys_open(p, uap, retval);

	if (!ret && !noctty && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
		struct filedesc *fdp = p->p_fd;
		struct file *fp;

		if ((fp = fd_getfile(fdp, *retval)) == NULL)
			return EBADF;
		FREF(fp);
		if (fp->f_type == DTYPE_VNODE)
			(fp->f_ops->fo_ioctl)(fp, TIOCSCTTY, (caddr_t) 0, p);
		FRELE(fp);
	}
	return ret;
}

int
ibcs2_sys_creat(p, v, retval)
        struct proc *p;  
	void *v;
	register_t *retval;
{       
	struct ibcs2_sys_creat_args /* {
		syscallarg(char *) path;
		syscallarg(int) mode;
	} */ *uap = v;
	struct sys_open_args cup;   
	caddr_t sg = stackgap_init(p->p_emul);

	IBCS2_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path));
	SCARG(&cup, path) = SCARG(uap, path);
	SCARG(&cup, mode) = SCARG(uap, mode);
	SCARG(&cup, flags) = O_WRONLY | O_CREAT | O_TRUNC;
	return sys_open(p, &cup, retval);
}       

int
ibcs2_sys_access(p, v, retval)
        struct proc *p;
	void *v;
        register_t *retval;
{
	struct ibcs2_sys_access_args /* {
		syscallarg(char *) path;
		syscallarg(int) flags;
	} */ *uap = v;
        struct sys_access_args cup;
        caddr_t sg = stackgap_init(p->p_emul);

        IBCS2_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
        SCARG(&cup, path) = SCARG(uap, path);
        SCARG(&cup, flags) = SCARG(uap, flags);
        return sys_access(p, &cup, retval);
}

int
ibcs2_sys_eaccess(p, v, retval)
        struct proc *p;
	void *v;
        register_t *retval;
{
	register struct ibcs2_sys_eaccess_args /* {
		syscallarg(char *) path;
		syscallarg(int) flags;
	} */ *uap = v;
	register struct ucred *cred = p->p_ucred;
	register struct vnode *vp;
        int error, flags;
        struct nameidata nd;
        caddr_t sg = stackgap_init(p->p_emul);

        IBCS2_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            SCARG(uap, path), p);
        if ((error = namei(&nd)) != 0)
                return error;
        vp = nd.ni_vp;

        /* Flags == 0 means only check for existence. */
        if (SCARG(uap, flags)) {
                flags = 0;
                if (SCARG(uap, flags) & IBCS2_R_OK)
                        flags |= VREAD;
                if (SCARG(uap, flags) & IBCS2_W_OK)
                        flags |= VWRITE;
                if (SCARG(uap, flags) & IBCS2_X_OK)
                        flags |= VEXEC;
                if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
                        error = VOP_ACCESS(vp, flags, cred, p);
        }
        vput(vp);
        return error;
}

int
ibcs2_sys_fcntl(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct ibcs2_sys_fcntl_args /* {
		syscallarg(int) fd;
		syscallarg(int) cmd;
		syscallarg(char *) arg;
	} */ *uap = v;
	int error;
	struct sys_fcntl_args fa;
	struct flock *flp;
	struct ibcs2_flock ifl;
	
	switch(SCARG(uap, cmd)) {
	case IBCS2_F_DUPFD:
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_DUPFD;
		SCARG(&fa, arg) = SCARG(uap, arg);
		return sys_fcntl(p, &fa, retval);
	case IBCS2_F_GETFD:
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_GETFD;
		SCARG(&fa, arg) = SCARG(uap, arg);
		return sys_fcntl(p, &fa, retval);
	case IBCS2_F_SETFD:
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_SETFD;
		SCARG(&fa, arg) = SCARG(uap, arg);
		return sys_fcntl(p, &fa, retval);
	case IBCS2_F_GETFL:
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_GETFL;
		SCARG(&fa, arg) = SCARG(uap, arg);
		error = sys_fcntl(p, &fa, retval);
		if (error)
			return error;
		*retval = oflags2ioflags(*retval);
		return error;
	case IBCS2_F_SETFL:
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_SETFL;
		SCARG(&fa, arg) = (void *)ioflags2oflags((int) SCARG(uap, arg));
		return sys_fcntl(p, &fa, retval);

	case IBCS2_F_GETLK:
	    {
		caddr_t sg = stackgap_init(p->p_emul);
		flp = stackgap_alloc(&sg, sizeof(*flp));
		error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
			       ibcs2_flock_len);
		if (error)
			return error;
		cvt_iflock2flock(&ifl, flp);
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_GETLK;
		SCARG(&fa, arg) = (void *)flp;
		error = sys_fcntl(p, &fa, retval);
		if (error)
			return error;
		cvt_flock2iflock(flp, &ifl);
		return copyout((caddr_t)&ifl, (caddr_t)SCARG(uap, arg),
			       ibcs2_flock_len);
	    }

	case IBCS2_F_SETLK:
	    {
		caddr_t sg = stackgap_init(p->p_emul);
		flp = stackgap_alloc(&sg, sizeof(*flp));
		error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
			       ibcs2_flock_len);
		if (error)
			return error;
		cvt_iflock2flock(&ifl, flp);
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_SETLK;
		SCARG(&fa, arg) = (void *)flp;
		return sys_fcntl(p, &fa, retval);
	    }

	case IBCS2_F_SETLKW:
	    {
		caddr_t sg = stackgap_init(p->p_emul);
		flp = stackgap_alloc(&sg, sizeof(*flp));
		error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
			       ibcs2_flock_len);
		if (error)
			return error;
		cvt_iflock2flock(&ifl, flp);
		SCARG(&fa, fd) = SCARG(uap, fd);
		SCARG(&fa, cmd) = F_SETLKW;
		SCARG(&fa, arg) = (void *)flp;
		return sys_fcntl(p, &fa, retval);
	    }
	case IBCS2_F_FREESP:
	    {
		struct ibcs2_flock	ifl;
		off_t			off, cur;
		caddr_t			sg = stackgap_init(p->p_emul);
		struct sys_fstat_args	ofst;
		struct stat		ost;
		struct sys_lseek_args	ols;
		struct sys_ftruncate_args /* {
			syscallarg(int) fd;
			syscallarg(int) pad;
			syscallarg(off_t) length;
		} */ nuap;

		error = copyin(SCARG(uap, arg), &ifl, sizeof ifl);
		if (error)
			return error;

		SCARG(&ofst, fd) = SCARG(uap, fd);
		SCARG(&ofst, sb) = stackgap_alloc(&sg,
		    sizeof(struct stat));
		if ((error = sys_fstat(p, &ofst, retval)) != 0)
			return error;
		if ((error = copyin(SCARG(&ofst, sb), &ost,
		    sizeof ost)) != 0)
			return error;

		SCARG(&ols, fd) = SCARG(uap, fd);
		SCARG(&ols, whence) = SEEK_CUR;
		SCARG(&ols, offset) = 0;
		if ((error = sys_lseek(p, &ols, (register_t *)&cur)) != 0)
			return error;

		off = (off_t)ifl.l_start;
		switch (ifl.l_whence) {
		case 0:
			off = (off_t)ifl.l_start;
			break;
		case 1:
			off = ost.st_size + (off_t)ifl.l_start;
			break;
		case 2:
			off = cur - (off_t)ifl.l_start;
			break;
		default:
			return EINVAL;
		}

		if (ifl.l_len != 0 && off + ifl.l_len != ost.st_size)
			return EINVAL;	/* Sorry, cannot truncate in middle */

		SCARG(&nuap, fd) = SCARG(uap, fd);
		SCARG(&nuap, length) = off;
		return (sys_ftruncate(p, &nuap, retval));
	    }
	}
	return ENOSYS;
}