/*	$OpenBSD: svr4_fcntl.c,v 1.13 1997/12/20 16:32:08 deraadt Exp $	 */
/*	$NetBSD: svr4_fcntl.c,v 1.14 1995/10/14 20:24:24 christos Exp $	 */

/*
 * Copyright (c) 1997 Theo de Raadt
 * Copyright (c) 1994 Christos Zoulas
 * 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/poll.h>
#include <sys/syscallargs.h>

#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_syscallargs.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_fcntl.h>

static u_long svr4_to_bsd_cmd __P((u_long));
static int svr4_to_bsd_flags __P((int));
static int bsd_to_svr4_flags __P((int));
static void bsd_to_svr4_flock __P((struct flock *, struct svr4_flock *));
static void svr4_to_bsd_flock __P((struct svr4_flock *, struct flock *));
static void bsd_to_svr3_flock __P((struct flock *, struct svr4_flock_svr3 *));
static void svr3_to_bsd_flock __P((struct svr4_flock_svr3 *, struct flock *));

static u_long
svr4_to_bsd_cmd(cmd)
	u_long	cmd;
{
	switch (cmd) {
	case SVR4_F_DUPFD:
		return F_DUPFD;
	case SVR4_F_GETFD:
		return F_GETFD;
	case SVR4_F_SETFD:
		return F_SETFD;
	case SVR4_F_GETFL:
		return F_GETFL;
	case SVR4_F_SETFL:
		return F_SETFL;
	case SVR4_F_GETLK:
	case SVR4_F_GETLK_SVR3:
		return F_GETLK;
	case SVR4_F_SETLK:
		return F_SETLK;
	case SVR4_F_SETLKW:
		return F_SETLKW;
	default:
		return -1;
	}
}


static int
svr4_to_bsd_flags(l)
	int	l;
{
	int	r = 0;
	r |= (l & SVR4_O_RDONLY) ? O_RDONLY : 0;
	r |= (l & SVR4_O_WRONLY) ? O_WRONLY : 0;
	r |= (l & SVR4_O_RDWR) ? O_RDWR : 0;
	r |= (l & SVR4_O_NDELAY) ? O_NONBLOCK : 0;
	r |= (l & SVR4_O_APPEND) ? O_APPEND : 0;
	r |= (l & SVR4_O_SYNC) ? O_FSYNC : 0;
#if 0
	/* Dellism ??? */
	r |= (l & SVR4_O_RAIOSIG) ? O_ASYNC : 0;
#endif
	r |= (l & SVR4_O_NONBLOCK) ? O_NONBLOCK : 0;
	r |= (l & SVR4_O_PRIV) ? O_EXLOCK : 0;
	r |= (l & SVR4_O_CREAT) ? O_CREAT : 0;
	r |= (l & SVR4_O_TRUNC) ? O_TRUNC : 0;
	r |= (l & SVR4_O_EXCL) ? O_EXCL : 0;
	r |= (l & SVR4_O_NOCTTY) ? O_NOCTTY : 0;
	return r;
}


static int
bsd_to_svr4_flags(l)
	int	l;
{
	int	r = 0;
	r |= (l & O_RDONLY) ? SVR4_O_RDONLY : 0;
	r |= (l & O_WRONLY) ? SVR4_O_WRONLY : 0;
	r |= (l & O_RDWR) ? SVR4_O_RDWR : 0;
	r |= (l & O_NDELAY) ? SVR4_O_NONBLOCK : 0;
	r |= (l & O_APPEND) ? SVR4_O_APPEND : 0;
	r |= (l & O_FSYNC) ? SVR4_O_SYNC : 0;
#if 0
	/* Dellism ??? */
	r |= (l & O_ASYNC) ? SVR4_O_RAIOSIG : 0;
#endif
	r |= (l & O_NONBLOCK) ? SVR4_O_NONBLOCK : 0;
	r |= (l & O_EXLOCK) ? SVR4_O_PRIV : 0;
	r |= (l & O_CREAT) ? SVR4_O_CREAT : 0;
	r |= (l & O_TRUNC) ? SVR4_O_TRUNC : 0;
	r |= (l & O_EXCL) ? SVR4_O_EXCL : 0;
	r |= (l & O_NOCTTY) ? SVR4_O_NOCTTY : 0;
	return r;
}

static void
bsd_to_svr4_flock(iflp, oflp)
	struct flock		*iflp;
	struct svr4_flock	*oflp;
{
	switch (iflp->l_type) {
	case F_RDLCK:
		oflp->l_type = SVR4_F_RDLCK;
		break;
	case F_WRLCK:
		oflp->l_type = SVR4_F_WRLCK;
		break;
	case F_UNLCK:
		oflp->l_type = SVR4_F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = (short) iflp->l_whence;
	oflp->l_start = (svr4_off_t) iflp->l_start;
	oflp->l_len = (svr4_off_t) iflp->l_len;
	oflp->l_sysid = 0;
	oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}

static void
svr4_to_bsd_flock(iflp, oflp)
	struct svr4_flock	*iflp;
	struct flock		*oflp;
{
	switch (iflp->l_type) {
	case SVR4_F_RDLCK:
		oflp->l_type = F_RDLCK;
		break;
	case SVR4_F_WRLCK:
		oflp->l_type = F_WRLCK;
		break;
	case SVR4_F_UNLCK:
		oflp->l_type = F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = iflp->l_whence;
	oflp->l_start = (off_t) iflp->l_start;
	oflp->l_len = (off_t) iflp->l_len;
	oflp->l_pid = (pid_t) iflp->l_pid;
}

static void
bsd_to_svr3_flock(iflp, oflp)
	struct flock		*iflp;
	struct svr4_flock_svr3	*oflp;
{
	switch (iflp->l_type) {
	case F_RDLCK:
		oflp->l_type = SVR4_F_RDLCK;
		break;
	case F_WRLCK:
		oflp->l_type = SVR4_F_WRLCK;
		break;
	case F_UNLCK:
		oflp->l_type = SVR4_F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = (short) iflp->l_whence;
	oflp->l_start = (svr4_off_t) iflp->l_start;
	oflp->l_len = (svr4_off_t) iflp->l_len;
	oflp->l_sysid = 0;
	oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}


static void
svr3_to_bsd_flock(iflp, oflp)
	struct svr4_flock_svr3	*iflp;
	struct flock		*oflp;
{
	switch (iflp->l_type) {
	case SVR4_F_RDLCK:
		oflp->l_type = F_RDLCK;
		break;
	case SVR4_F_WRLCK:
		oflp->l_type = F_WRLCK;
		break;
	case SVR4_F_UNLCK:
		oflp->l_type = F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = iflp->l_whence;
	oflp->l_start = (off_t) iflp->l_start;
	oflp->l_len = (off_t) iflp->l_len;
	oflp->l_pid = (pid_t) iflp->l_pid;
}

int
svr4_sys_open(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_open_args	*uap = v;
	int			error;
	struct sys_open_args	cup;

	caddr_t sg = stackgap_init(p->p_emul);
	SVR4_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));

	SCARG(&cup, path) = SCARG(uap, path);
	SCARG(&cup, flags) = svr4_to_bsd_flags(SCARG(uap, flags));
	SCARG(&cup, mode) = SCARG(uap, mode);
	error = sys_open(p, &cup, retval);

	if (error)
		return error;

	if (!(SCARG(&cup, flags) & O_NOCTTY) && SESS_LEADER(p) &&
	    !(p->p_flag & P_CONTROLT)) {
		struct filedesc	*fdp = p->p_fd;
		struct file	*fp = fdp->fd_ofiles[*retval];

		/* ignore any error, just give it a try */
		if (fp->f_type == DTYPE_VNODE)
			(fp->f_ops->fo_ioctl) (fp, TIOCSCTTY, (caddr_t) 0, p);
	}
	return 0;
}

int
svr4_sys_creat(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_creat_args *uap = v;
	struct sys_open_args cup;

	caddr_t sg = stackgap_init(p->p_emul);
	SVR4_CHECK_ALT_EXIST(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
svr4_sys_access(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_access_args *uap = v;
	struct sys_access_args cup;

	caddr_t sg = stackgap_init(p->p_emul);
	SVR4_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
svr4_sys_pread(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_pread_args *uap = v;
	struct sys_lseek_args lap;
	struct sys_read_args rap;
	int error;

	SCARG(&lap, fd) = SCARG(uap, fd);
	SCARG(&lap, offset) = SCARG(uap, off);
	SCARG(&lap, whence) = SEEK_CUR;

	if ((error = sys_lseek(p, &lap, retval)) != 0)
		return error;

	SCARG(&rap, fd) = SCARG(uap, fd);
	SCARG(&rap, buf) = SCARG(uap, buf);
	SCARG(&rap, nbyte) = SCARG(uap, nbyte);

	return sys_read(p, &rap, retval);
}

int
svr4_sys_pwrite(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_pwrite_args *uap = v;
	struct sys_lseek_args lap;
	struct sys_write_args wap;
	int error;

	SCARG(&lap, fd) = SCARG(uap, fd);
	SCARG(&lap, offset) = SCARG(uap, off);
	SCARG(&lap, whence) = SEEK_CUR;

	if ((error = sys_lseek(p, &lap, retval)) != 0)
		return error;

	SCARG(&wap, fd) = SCARG(uap, fd);
	SCARG(&wap, buf) = (char *)SCARG(uap, buf); /* XXX until sys_write_args
						       is fixed */
	SCARG(&wap, nbyte) = SCARG(uap, nbyte);

	return sys_write(p, &wap, retval);
}

int
svr4_sys_fcntl(p, v, retval)
	register struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_fcntl_args	*uap = v;
	int				error;
	struct sys_fcntl_args		fa;

	SCARG(&fa, fd) = SCARG(uap, fd);

	if (SCARG(uap, cmd) == SVR4_F_FREESP) {
		struct svr4_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));
	}

	SCARG(&fa, cmd) = svr4_to_bsd_cmd(SCARG(uap, cmd));

	switch (SCARG(&fa, cmd)) {
	case F_DUPFD:
	case F_GETFD:
	case F_SETFD:
		SCARG(&fa, arg) = SCARG(uap, arg);
		return sys_fcntl(p, &fa, retval);

	case F_GETFL:
		SCARG(&fa, arg) = SCARG(uap, arg);
		error = sys_fcntl(p, &fa, retval);
		if (error)
			return error;
		*retval = bsd_to_svr4_flags(*retval);
		return error;

	case F_SETFL:
		{
			/*
			 * we must save the O_ASYNC flag, as that is
			 * handled by ioctl(_, I_SETSIG, _) emulation.
			 */
			int cmd, flags;

			cmd = SCARG(&fa, cmd); /* save it for a while */

			SCARG(&fa, cmd) = F_GETFL;
			if ((error = sys_fcntl(p, &fa, &flags)) != 0)
				return error;
			flags &= O_ASYNC;
			flags |= svr4_to_bsd_flags((u_long) SCARG(uap, arg));
			SCARG(&fa, cmd) = cmd;
			SCARG(&fa, arg) = (void *) flags;
			return sys_fcntl(p, &fa, retval);
		}

	case F_GETLK:
		if (SCARG(uap, cmd) == SVR4_F_GETLK_SVR3)
		{
			struct svr4_flock_svr3	ifl;
			struct flock		*flp;
			caddr_t			sg = stackgap_init(p->p_emul);

			flp = stackgap_alloc(&sg, sizeof(*flp));
			error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&ifl,
			    sizeof ifl);
			if (error)
				return error;
			svr3_to_bsd_flock(&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;
			bsd_to_svr3_flock(flp, &ifl);
			return copyout((caddr_t)&ifl, (caddr_t)SCARG(uap, arg),
			    sizeof ifl);
		}
		/*FALLTHROUGH*/
	case F_SETLK:
	case F_SETLKW:
		{
			struct svr4_flock	ifl;
			struct flock		*flp, fl;
			caddr_t			sg = stackgap_init(p->p_emul);

			flp = stackgap_alloc(&sg, sizeof(struct flock));
			SCARG(&fa, arg) = (void *)flp;

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

			svr4_to_bsd_flock(&ifl, &fl);

			error = copyout(&fl, flp, sizeof fl);
			if (error)
				return error;

			error = sys_fcntl(p, &fa, retval);
			if (error || SCARG(&fa, cmd) != F_GETLK)
				return error;

			error = copyin(flp, &fl, sizeof fl);
			if (error)
				return error;

			bsd_to_svr4_flock(&fl, &ifl);

			return copyout(&ifl, SCARG(uap, arg), sizeof ifl);
		}
	default:
		return ENOSYS;
	}
}