NetBSD/sys/compat/svr4/svr4_misc.c

/* $NetBSD: svr4_misc.c,v 1.7 1994/10/24 17:37:43 deraadt Exp $	*/
/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 */

/*
 * SVR4 compatibility module.
 *
 * SVR4 system calls that are implemented differently in BSD are
 * handled here.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/dir.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/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/socket.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/unistd.h>
#include <sys/times.h>

#include <netinet/in.h>
#include <sys/syscallargs.h>

#include <miscfs/specfs/specdev.h>

#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_syscallargs.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_time.h>
#include <compat/svr4/svr4_dirent.h>

#include <vm/vm.h>

int
svr4_wait(p, uap, retval)
    register struct proc *p;
    register struct svr4_wait_args *uap;
    register_t *retval;
{
    struct wait4_args w4;
    SCARG(&w4, rusage) = NULL;
    SCARG(&w4, options) = 0;
    SCARG(&w4, status) = SCARG(uap, status);
    SCARG(&w4, pid) = WAIT_ANY;
    return wait4(p, &w4, retval);
}


int
svr4_execv(p, uap, retval)
    register struct proc *p;
    register struct svr4_execv_args *uap;
    register_t *retval;
{
    struct execve_args ex;
    stackgap_init();
    SCARG(&ex, path) = SCARG(uap, path);
    SCARG(&ex, argp) = SCARG(uap, argp);
    SCARG(&ex, envp) = NULL;
    CHECKALT(p, SCARG(&ex, path));
    return execve(p, &ex, retval);
}


int
svr4_execve(p, uap, retval)
    register struct proc *p;
    register struct execve_args *uap;
    register_t *retval;
{
    stackgap_init();
    CHECKALT(p, SCARG(uap, path));
    return execve(p, uap, retval);
}


int
svr4_time(p, uap, retval)
    register struct proc *p;
    register struct svr4_time_args *uap;
    register_t *retval;
{
    int error = 0;
    struct timeval tv;

    microtime(&tv);
    if (SCARG(uap, t))
	error = copyout(&tv.tv_sec, SCARG(uap, t), sizeof(*(SCARG(uap, t))));
    else
	*retval = (int) tv.tv_sec;

    return error;
}


int
svr4_sigpending(p, uap, retval)
    register struct proc *p;
    register struct svr4_sigpending_args *uap;
    register_t *retval;
{
    int mask = p->p_siglist & p->p_sigmask;

    return copyout(&mask, SCARG(uap, mask), sizeof(int));
}

/*
 * Read SVR4-style directory entries.  We suck them into kernel space so
 * that they can be massaged before being copied out to user code.  Like
 * SunOS, we squish out `empty' entries.
 *
 * This is quite ugly, but what do you expect from compatibility code?
 */
int
svr4_getdents(p, uap, retval)
    register struct proc *p;
    register struct svr4_getdents_args *uap;
    register_t *retval;
{
    struct vnode *vp;
    caddr_t inp, buf;	/* BSD-format */
    int len, reclen;	/* BSD-format */
    caddr_t outp;	/* SVR4-format */
    int resid;		/* SVR4-format */
    struct file *fp;
    struct uio auio;
    struct iovec aiov;
    struct svr4_dirent idb;
    off_t off;			/* true file offset */
    svr4_off_t soff;		/* SYSV file offset */
    int buflen, error, eofflag;

#define	BSD_DIRENT(cp)		((struct dirent *)(cp))
#define SVR4_DIRENT(cp)		((struct svr4_dirent *)(cp))
#define	SVR4_RECLEN(reclen)	(reclen + sizeof(u_short))

    if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
	return (error);
    if ((fp->f_flag & FREAD) == 0)
	return (EBADF);

    vp = (struct vnode *)fp->f_data;

    if (vp->v_type != VDIR)	/* XXX  vnode readdir op should do this */
	return (EINVAL);

    buflen = min(MAXBSIZE, SCARG(uap, nbytes));
    buf = malloc(buflen, M_TEMP, M_WAITOK);
    VOP_LOCK(vp);
    off = fp->f_offset;
again:
    aiov.iov_base = buf;
    aiov.iov_len = buflen;
    auio.uio_iov = &aiov;
    auio.uio_iovcnt = 1;
    auio.uio_rw = UIO_READ;
    auio.uio_segflg = UIO_SYSSPACE;
    auio.uio_procp = p;
    auio.uio_resid = buflen;
    auio.uio_offset = off;
    /*
     * First we read into the malloc'ed buffer, then
     * we massage it into user space, one record at a time.
     */
    error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0);
    if (error)
	goto out;

    inp = buf;
    outp = SCARG(uap, buf);
    resid = SCARG(uap, nbytes);
    if ((len = buflen - auio.uio_resid) == 0)
	goto eof;

    for (; len > 0; len -= reclen) {
	reclen = ((struct dirent *)inp)->d_reclen;
	if (reclen & 3)
	    panic("svr4_getdents");
	off += reclen;		/* each entry points to next */
	if (BSD_DIRENT(inp)->d_fileno == 0) {
	    inp += reclen;	/* it is a hole; squish it out */
	    continue;
	}
	if (reclen > len || resid < SVR4_RECLEN(reclen)) {
	    /* entry too big for buffer, so just stop */
	    outp++;
	    break;
	}
	/*
	 * Massage in place to make a SVR4-shaped dirent (otherwise
	 * we have to worry about touching user memory outside of
	 * the copyout() call).
	 */
	idb.d_ino = (svr4_ino_t)BSD_DIRENT(inp)->d_fileno;
	idb.d_off = (svr4_off_t)off;
	idb.d_reclen = (u_short)SVR4_RECLEN(reclen);
	if ((error = copyout((caddr_t)&idb, outp, 10)) != 0 ||
	    (error = copyout(BSD_DIRENT(inp)->d_name, outp + 10,
			     BSD_DIRENT(inp)->d_namlen + 1)) != 0)
		goto out;
	/* advance past this real entry */
	inp += reclen;
	/* advance output past Sun-shaped entry */
	outp += SVR4_RECLEN(reclen);
	resid -= SVR4_RECLEN(reclen);
    }

    /* if we squished out the whole block, try again */
    if (outp == SCARG(uap, buf))
	goto again;
    fp->f_offset = off;		/* update the vnode offset */

eof:
    *retval = SCARG(uap, nbytes) - resid;
out:
    VOP_UNLOCK(vp);
    free(buf, M_TEMP);
    return error;
}

#define DEVZERO makedev(2, 12)

int
svr4_mmap(p, uap, retval)
    register struct proc *p;
    register struct svr4_mmap_args *uap;
    register_t *retval;
{
    struct filedesc *fdp;
    struct file *fp;
    struct vnode *vp;
    struct mmap_args mm;

    /*
     * Verify the arguments.
     */
    if (SCARG(uap, prot) & ~(PROT_READ|PROT_WRITE|PROT_EXEC))
	return EINVAL;			/* XXX still needed? */

    SCARG(&mm, prot) = SCARG(uap, prot);
    SCARG(&mm, len) = SCARG(uap, len);
    SCARG(&mm, flags) = SCARG(uap, flags);
    SCARG(&mm, fd) = SCARG(uap, fd);
    SCARG(&mm, addr) = SCARG(uap, addr);
    SCARG(&mm, pos) = SCARG(uap, pos);

    if ((SCARG(&mm, flags) & MAP_FIXED) == 0 &&
	SCARG(&mm, addr) != 0 &&
	SCARG(&mm, addr) < (caddr_t)round_page(p->p_vmspace->vm_daddr+MAXDSIZ))
	SCARG(&mm, addr) = (caddr_t)round_page(p->p_vmspace->vm_daddr+MAXDSIZ);

    /*
     * Special case: if fd refers to /dev/zero, map as MAP_ANON.  (XXX)
     */
    fdp = p->p_fd;
    if ((unsigned)SCARG(uap, fd) < fdp->fd_nfiles &&			/*XXX*/
	(fp = fdp->fd_ofiles[SCARG(uap, fd)]) != NULL &&		/*XXX*/
	fp->f_type == DTYPE_VNODE &&				/*XXX*/
	(vp = (struct vnode *)fp->f_data)->v_type == VCHR &&	/*XXX*/
	vp->v_rdev == DEVZERO) {				/*XXX*/
	SCARG(&mm, flags) |= MAP_ANON;
	SCARG(&mm, fd) = -1;
    }

    return mmap(p, &mm, retval);
}

int
svr4_fchroot(p, uap, retval)
    register struct proc *p;
    register struct svr4_fchroot_args *uap;
    register_t *retval;
{
    struct filedesc *fdp = p->p_fd;
    struct vnode *vp;
    struct file *fp;
    int error;

    if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
	return error;
    if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
	return error;
    vp = (struct vnode *)fp->f_data;
    VOP_LOCK(vp);
    if (vp->v_type != VDIR)
	error = ENOTDIR;
    else
	error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
    VOP_UNLOCK(vp);
    if (error)
	return error;
    VREF(vp);
    if (fdp->fd_rdir != NULL)
	vrele(fdp->fd_rdir);
    fdp->fd_rdir = vp;
    return 0;
}


int
svr4_mknod(p, uap, retval)
    register struct proc *p;
    register struct svr4_mknod_args *uap;
    register_t *retval;
{
    stackgap_init();
    CHECKALT(p, SCARG(uap, path));

    if (S_ISFIFO(SCARG(uap, mode))) {
	struct mkfifo_args ap;
	SCARG(&ap, path) = SCARG(uap, path);
	SCARG(&ap, mode) = SCARG(uap, mode);
	return mkfifo(p, &ap, retval);
    }
    else {
	struct mknod_args ap;
	SCARG(&ap, path) = SCARG(uap, path);
	SCARG(&ap, mode) = SCARG(uap, mode);
	SCARG(&ap, dev) = SCARG(uap, dev);
	return mknod(p, &ap, retval);
    }
}

int
svr4_vhangup(p, uap, retval)
    struct proc *p;
    void *uap;
    int *retval;
{
    return 0;
}

#define SVR4_CONFIG_UNUSED	1
#define SVR4_CONFIG_NGROUPS	2
#define SVR4_CONFIG_CHILD_MAX	3
#define SVR4_CONFIG_OPEN_FILES	4
#define SVR4_CONFIG_POSIX_VER	5
#define SVR4_CONFIG_PAGESIZE	6
#define SVR4_CONFIG_CLK_TCK	7
#define SVR4_CONFIG_XOPEN_VER	8
#define SVR4_CONFIG_PROF_TCK	10

int
svr4_sysconfig(p, uap, retval)
    register struct proc *p;
    register struct svr4_sysconfig_args *uap;
    register_t *retval;
{
    extern int maxfiles;

    switch(SCARG(uap, name)) {
    case SVR4_CONFIG_UNUSED:
	*retval = 0;
	break;
    case SVR4_CONFIG_NGROUPS:
	*retval = NGROUPS_MAX;
	break;
    case SVR4_CONFIG_CHILD_MAX:
	*retval = maxproc;
	break;
    case SVR4_CONFIG_OPEN_FILES:
	*retval = maxfiles;
	break;
    case SVR4_CONFIG_POSIX_VER:
	*retval = 198808;
	break;
    case SVR4_CONFIG_PAGESIZE:
	*retval = NBPG;
	break;
    case SVR4_CONFIG_CLK_TCK:
	*retval = 60;		/* should this be `hz', ie. 100? */
	break;
    case SVR4_CONFIG_XOPEN_VER:
	*retval = 2;		/* XXX: What should that be? */
	break;
    case SVR4_CONFIG_PROF_TCK:
	*retval = 60;		/* XXX: What should that be? */
	break;
    default:
	return EINVAL;
    }
    return 0;
}

#define SVR4_RLIMIT_NOFILE	5	/* Other RLIMIT_* are the same */
#define SVR4_RLIMIT_VMEM	6	/* Other RLIMIT_* are the same */
#define SVR4_RLIM_NLIMITS	7

int
svr4_getrlimit(p, uap, retval)
    register struct proc *p;
    register struct svr4_getrlimit_args *uap;
    register_t *retval;
{
    struct compat_43_getrlimit_args ap;
    if (SCARG(uap, which) >= SVR4_RLIM_NLIMITS)
	return EINVAL;

    if (SCARG(uap, which) == SVR4_RLIMIT_NOFILE)
	SCARG(uap, which) = RLIMIT_NOFILE;
    if (SCARG(uap, which) == SVR4_RLIMIT_VMEM)
	SCARG(uap, which) = RLIMIT_RSS;

    SCARG(&ap, which) = SCARG(uap, which);
    SCARG(&ap, rlp) = SCARG(uap, rlp);

    return compat_43_getrlimit(p, &ap, retval);
}

int
svr4_setrlimit(p, uap, retval)
    register struct proc *p;
    register struct svr4_setrlimit_args *uap;
    register_t *retval;
{
    struct compat_43_setrlimit_args ap;
    if (SCARG(uap, which) >= SVR4_RLIM_NLIMITS)
	return EINVAL;

    if (SCARG(uap, which) == SVR4_RLIMIT_NOFILE)
	SCARG(uap, which) = RLIMIT_NOFILE;
    if (SCARG(uap, which) == SVR4_RLIMIT_VMEM)
	SCARG(uap, which) = RLIMIT_RSS;

    SCARG(&ap, which) = SCARG(uap, which);
    SCARG(&ap, rlp) = SCARG(uap, rlp);

    return compat_43_setrlimit(p, uap, retval);
}


int
svr4_syssun(p, uap, retval)
    register struct proc *p;
    register struct svr4_syssun_args *uap;
    register_t *retval;
{
#ifdef DEBUG_SVR4
    printf("syssun(%d)\n", SCARG(uap, gate));
#endif
    return 0;
}

/* ARGSUSED */
int
svr4_break(p, uap, retval)
    register struct proc *p;
    register struct svr4_break_args *uap;
    register_t *retval;
{
    register struct vmspace *vm = p->p_vmspace;
    vm_offset_t new, old;
    int rv;
    register int diff;

    old = (vm_offset_t)vm->vm_daddr;
    new = round_page(SCARG(uap, nsize));
    diff = new - old;

    printf("break(1): old %x new %x diff %x\n", old, new, diff);

    if ((int) diff > p->p_rlimit[RLIMIT_DATA].rlim_cur)
	return ENOMEM;

    old = round_page(old + ctob(vm->vm_dsize));
    printf("break(2): dsize = %x ctob %x\n",
	   vm->vm_dsize, ctob(vm->vm_dsize));

    new = old + diff;
    printf("break(3): old %x new %x diff %x\n", old, new, diff);

    if (diff > 0) {
	rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
	if (rv != KERN_SUCCESS) {
	    uprintf("sbrk: grow failed, return = %d\n", rv);
	    return ENOMEM;
	}
	vm->vm_dsize += btoc(diff);
    } else if (diff < 0) {
	diff = -diff;
	rv = vm_deallocate(&vm->vm_map, new, diff);
	if (rv != KERN_SUCCESS) {
	    uprintf("sbrk: shrink failed, return = %d\n", rv);
	    return ENOMEM;
	}
	vm->vm_dsize -= btoc(diff);
    }
    return 0;
}

static __inline clock_t
timeval_to_clock_t(tv)
    struct timeval* tv;
{
    return tv->tv_sec * hz + tv->tv_usec / (1000000 / hz);
}

int
svr4_times(p, uap, retval)
    register struct proc *p;
    register struct svr4_times_args *uap;
    register_t *retval;
{
    int error;
    struct tms tms;
    struct timeval t;
    struct rusage *ru;
    struct rusage r;
    struct getrusage_args ga;

    stackgap_init();
    ru = stackgap_alloc(sizeof(struct rusage));

    SCARG(&ga, who) = RUSAGE_SELF;
    SCARG(&ga, rusage) = ru;

    error = getrusage(p, &ga, retval);
    if (error)
	return error;

    if (error = copyin(ru, &r, sizeof r))
	return error;

    tms.tms_utime = timeval_to_clock_t(r.ru_utime);
    tms.tms_stime = timeval_to_clock_t(r.ru_stime);

    SCARG(&ga, who) = RUSAGE_CHILDREN;
    error = getrusage(p, &ga, retval);
    if (error)
	return error;

    if (error = copyin(ru, &r, sizeof r))
	return error;

    tms.tms_cutime = timeval_to_clock_t(&r.ru_utime);
    tms.tms_cstime = timeval_to_clock_t(&r.ru_stime);

    microtime(&t);
    *retval = timeval_to_clock_t(t);
    
    return copyout(&tms, SCARG(uap, tp), sizeof(tms));
}