BSD 4_4_Lite2 release

[unix-history] / usr / src / sys / kern / kern_descrip.c

diff --git a/usr/src/sys/kern/kern_descrip.c b/usr/src/sys/kern/kern_descrip.c
index f427a78..3f2e424 100644 (file)
--- a/usr/src/sys/kern/kern_descrip.c
+++ b/usr/src/sys/kern/kern_descrip.c
@@ -1,413 +1,930 @@
 /*
 /*

- * Copyright (c) 1982 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.

  *
  *

- *     @(#)kern_descrip.c      6.13 (Berkeley) %G%
+ * 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.
+ *
+ *     @(#)kern_descrip.c      8.8 (Berkeley) 2/14/95

  */
 
  */
 

-#include "param.h"
-#include "systm.h"
-#include "dir.h"
-#include "user.h"
-#include "kernel.h"
-#include "inode.h"
-#include "proc.h"
-#include "file.h"
-#include "socket.h"
-#include "socketvar.h"
-#include "mount.h"
-#include "stat.h"
-
-#include "ioctl.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/filedesc.h>
+#include <sys/kernel.h>
+#include <sys/vnode.h>
+#include <sys/proc.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/fcntl.h>
+#include <sys/malloc.h>
+#include <sys/syslog.h>
+#include <sys/unistd.h>
+#include <sys/resourcevar.h>
+
+#include <sys/mount.h>
+#include <sys/syscallargs.h>

 
 /*
  * Descriptor management.
  */
 
 /*
  * Descriptor management.
  */

-
-/*
- * TODO:
- *     eliminate u.u_error side effects
- */
+struct filelist filehead;      /* head of list of open files */
+int nfiles;                    /* actual number of open files */

 
 /*
  * System calls on descriptors.
  */
 
 /*
  * System calls on descriptors.
  */

-getdtablesize()
-{
-
-       u.u_r.r_val1 = NOFILE;
-}
-
-getdopt()
+/* ARGSUSED */
+int
+getdtablesize(p, uap, retval)
+       struct proc *p;
+       void *uap;
+       register_t *retval;

 {
 
 {
 

+       *retval = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
+       return (0);

 }
 
 }
 

-setdopt()
-{
-
-}
-
-dup()
+/*
+ * Duplicate a file descriptor.
+ */
+/* ARGSUSED */
+int
+dup(p, uap, retval)
+       struct proc *p;
+       struct dup_args /* {
+               syscallarg(u_int) fd;
+       } */ *uap;
+       register_t *retval;

 {
 {

-       register struct a {
-               int     i;
-       } *uap = (struct a *) u.u_ap;
-       struct file *fp;
-       int j;
-
-       if (uap->i &~ 077) { uap->i &= 077; dup2(); return; }   /* XXX */
+       register struct filedesc *fdp;
+       u_int old;
+       int new, error;
+
+       old = SCARG(uap, fd);
+       /*
+        * XXX Compatibility
+        */
+       if (old &~ 077) {
+               SCARG(uap, fd) &= 077;
+               return (dup2(p, uap, retval));
+       }

 
 

-       GETF(fp, uap->i);
-       j = ufalloc(0);
-       if (j < 0)
-               return;
-       dupit(j, fp, u.u_pofile[uap->i] &~ UF_EXCLOSE);
+       fdp = p->p_fd;
+       if (old >= fdp->fd_nfiles || fdp->fd_ofiles[old] == NULL)
+               return (EBADF);
+       if (error = fdalloc(p, 0, &new))
+               return (error);
+       return (finishdup(fdp, (int)old, new, retval));

 }
 
 }
 

-dup2()
+/*
+ * Duplicate a file descriptor to a particular value.
+ */
+/* ARGSUSED */
+int
+dup2(p, uap, retval)
+       struct proc *p;
+       struct dup2_args /* {
+               syscallarg(u_int) from;
+               syscallarg(u_int) to;
+       } */ *uap;
+       register_t *retval;

 {
 {

-       register struct a {
-               int     i, j;
-       } *uap = (struct a *) u.u_ap;
-       register struct file *fp;
-
-       GETF(fp, uap->i);
-       if (uap->j < 0 || uap->j >= NOFILE) {
-               u.u_error = EBADF;
-               return;
+       register struct filedesc *fdp = p->p_fd;
+       register int old = SCARG(uap, from), new = SCARG(uap, to);
+       int i, error;
+
+       if (old >= fdp->fd_nfiles ||
+           fdp->fd_ofiles[old] == NULL ||
+           new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
+           new >= maxfiles)
+               return (EBADF);
+       if (old == new) {
+               *retval = new;
+               return (0);

        }
        }

-       u.u_r.r_val1 = uap->j;
-       if (uap->i == uap->j)
-               return;
-       if (u.u_ofile[uap->j]) {
-               if (u.u_pofile[uap->j] & UF_MAPPED)
-                       munmapfd(uap->j);
-               closef(u.u_ofile[uap->j]);
-               if (u.u_error)
-                       return;
+       if (new >= fdp->fd_nfiles) {
+               if (error = fdalloc(p, new, &i))
+                       return (error);
+               if (new != i)
+                       panic("dup2: fdalloc");
+       } else if (fdp->fd_ofiles[new]) {
+               if (fdp->fd_ofileflags[new] & UF_MAPPED)
+                       (void) munmapfd(p, new);
+               /*
+                * dup2() must succeed even if the close has an error.
+                */
+               (void) closef(fdp->fd_ofiles[new], p);

        }
        }

-       dupit(uap->j, fp, u.u_pofile[uap->i] &~ UF_EXCLOSE);
-}
-
-dupit(fd, fp, flags)
-       int fd;
-       register struct file *fp;
-       register int flags;
-{
-
-       u.u_ofile[fd] = fp;
-       u.u_pofile[fd] = flags;
-       fp->f_count++;
-       if (fd > u.u_lastfile)
-               u.u_lastfile = fd;
+       return (finishdup(fdp, (int)old, (int)new, retval));

 }
 
 /*
  * The file control system call.
  */
 }
 
 /*
  * The file control system call.
  */

-fcntl()
+/* ARGSUSED */
+int
+fcntl(p, uap, retval)
+       struct proc *p;
+       register struct fcntl_args /* {
+               syscallarg(int) fd;
+               syscallarg(int) cmd;
+               syscallarg(void *) arg;
+       } */ *uap;
+       register_t *retval;

 {
 {

+       int fd = SCARG(uap, fd);
+       register struct filedesc *fdp = p->p_fd;

        register struct file *fp;
        register struct file *fp;

-       register struct a {
-               int     fdes;
-               int     cmd;
-               int     arg;
-       } *uap;
-       register i;

        register char *pop;
        register char *pop;

+       struct vnode *vp;
+       int i, tmp, error, flg = F_POSIX;
+       struct flock fl;
+       u_int newmin;
+
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);
+       pop = &fdp->fd_ofileflags[fd];
+       switch (SCARG(uap, cmd)) {

 
 

-       uap = (struct a *)u.u_ap;
-       GETF(fp, uap->fdes);
-       pop = &u.u_pofile[uap->fdes];
-       switch(uap->cmd) {

        case F_DUPFD:
        case F_DUPFD:

-               i = uap->arg;
-               if (i < 0 || i >= NOFILE) {
-                       u.u_error = EINVAL;
-                       return;
-               }
-               if ((i = ufalloc(i)) < 0)
-                       return;
-               dupit(i, fp, *pop &~ UF_EXCLOSE);
-               break;
+               newmin = (long)SCARG(uap, arg);
+               if (newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
+                   newmin >= maxfiles)
+                       return (EINVAL);
+               if (error = fdalloc(p, newmin, &i))
+                       return (error);
+               return (finishdup(fdp, fd, i, retval));

 
        case F_GETFD:
 
        case F_GETFD:

-               u.u_r.r_val1 = *pop & 1;
-               break;
+               *retval = *pop & 1;
+               return (0);

 
        case F_SETFD:
 
        case F_SETFD:

-               *pop = (*pop &~ 1) | (uap->arg & 1);
-               break;
+               *pop = (*pop &~ 1) | ((long)SCARG(uap, arg) & 1);
+               return (0);

 
        case F_GETFL:
 
        case F_GETFL:

-               u.u_r.r_val1 = fp->f_flag+FOPEN;
-               break;
+               *retval = OFLAGS(fp->f_flag);
+               return (0);

 
        case F_SETFL:
 
        case F_SETFL:

-               fp->f_flag &= FCNTLCANT;
-               fp->f_flag |= (uap->arg-FOPEN) &~ FCNTLCANT;
-               u.u_error = fset(fp, FNDELAY, fp->f_flag & FNDELAY);
-               if (u.u_error)
-                       break;
-               u.u_error = fset(fp, FASYNC, fp->f_flag & FASYNC);
-               if (u.u_error)
-                       (void) fset(fp, FNDELAY, 0);
-               break;
+               fp->f_flag &= ~FCNTLFLAGS;
+               fp->f_flag |= FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS;
+               tmp = fp->f_flag & FNONBLOCK;
+               error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
+               if (error)
+                       return (error);
+               tmp = fp->f_flag & FASYNC;
+               error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p);
+               if (!error)
+                       return (0);
+               fp->f_flag &= ~FNONBLOCK;
+               tmp = 0;
+               (void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
+               return (error);

 
        case F_GETOWN:
 
        case F_GETOWN:

-               u.u_error = fgetown(fp, &u.u_r.r_val1);
-               break;
+               if (fp->f_type == DTYPE_SOCKET) {
+                       *retval = ((struct socket *)fp->f_data)->so_pgid;
+                       return (0);
+               }
+               error = (*fp->f_ops->fo_ioctl)
+                       (fp, TIOCGPGRP, (caddr_t)retval, p);
+               *retval = -*retval;
+               return (error);

 
        case F_SETOWN:
 
        case F_SETOWN:

-               u.u_error = fsetown(fp, uap->arg);
-               break;
+               if (fp->f_type == DTYPE_SOCKET) {
+                       ((struct socket *)fp->f_data)->so_pgid =
+                           (long)SCARG(uap, arg);
+                       return (0);
+               }
+               if ((long)SCARG(uap, arg) <= 0) {
+                       SCARG(uap, arg) = (void *)(-(long)SCARG(uap, arg));
+               } else {
+                       struct proc *p1 = pfind((long)SCARG(uap, arg));
+                       if (p1 == 0)
+                               return (ESRCH);
+                       SCARG(uap, arg) = (void *)(long)p1->p_pgrp->pg_id;
+               }
+               return ((*fp->f_ops->fo_ioctl)
+                       (fp, TIOCSPGRP, (caddr_t)&SCARG(uap, arg), p));
+
+       case F_SETLKW:
+               flg |= F_WAIT;
+               /* Fall into F_SETLK */
+
+       case F_SETLK:
+               if (fp->f_type != DTYPE_VNODE)
+                       return (EBADF);
+               vp = (struct vnode *)fp->f_data;
+               /* Copy in the lock structure */
+               error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl,
+                   sizeof (fl));
+               if (error)
+                       return (error);
+               if (fl.l_whence == SEEK_CUR)
+                       fl.l_start += fp->f_offset;
+               switch (fl.l_type) {
+
+               case F_RDLCK:
+                       if ((fp->f_flag & FREAD) == 0)
+                               return (EBADF);
+                       p->p_flag |= P_ADVLOCK;
+                       return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
+
+               case F_WRLCK:
+                       if ((fp->f_flag & FWRITE) == 0)
+                               return (EBADF);
+                       p->p_flag |= P_ADVLOCK;
+                       return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
+
+               case F_UNLCK:
+                       return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl,
+                               F_POSIX));
+
+               default:
+                       return (EINVAL);
+               }
+
+       case F_GETLK:
+               if (fp->f_type != DTYPE_VNODE)
+                       return (EBADF);
+               vp = (struct vnode *)fp->f_data;
+               /* Copy in the lock structure */
+               error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl,
+                   sizeof (fl));
+               if (error)
+                       return (error);
+               if (fl.l_whence == SEEK_CUR)
+                       fl.l_start += fp->f_offset;
+               if (error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX))
+                       return (error);
+               return (copyout((caddr_t)&fl, (caddr_t)SCARG(uap, arg),
+                   sizeof (fl)));

 
        default:
 
        default:

-               u.u_error = EINVAL;
+               return (EINVAL);

        }
        }

+       /* NOTREACHED */

 }
 
 }
 

-fset(fp, bit, value)
-       struct file *fp;
-       int bit, value;
+/*
+ * Common code for dup, dup2, and fcntl(F_DUPFD).
+ */
+int
+finishdup(fdp, old, new, retval)
+       register struct filedesc *fdp;
+       register int old, new;
+       register_t *retval;

 {
 {

+       register struct file *fp;

 
 

-       if (value)
-               fp->f_flag |= bit;
-       else
-               fp->f_flag &= ~bit;
-       return (fioctl(fp, (int)(bit == FNDELAY ? FIONBIO : FIOASYNC),
-           (caddr_t)&value));
+       fp = fdp->fd_ofiles[old];
+       fdp->fd_ofiles[new] = fp;
+       fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
+       fp->f_count++;
+       if (new > fdp->fd_lastfile)
+               fdp->fd_lastfile = new;
+       *retval = new;
+       return (0);

 }
 
 }
 

-fgetown(fp, valuep)
-       struct file *fp;
-       int *valuep;
+/*
+ * Close a file descriptor.
+ */
+/* ARGSUSED */
+int
+close(p, uap, retval)
+       struct proc *p;
+       struct close_args /* {
+               syscallarg(int) fd;
+       } */ *uap;
+       register_t *retval;

 {
 {

-       int error;
-
-       switch (fp->f_type) {
-
-       case DTYPE_SOCKET:
-               *valuep = ((struct socket *)fp->f_data)->so_pgrp;
-               return (0);
+       int fd = SCARG(uap, fd);
+       register struct filedesc *fdp = p->p_fd;
+       register struct file *fp;
+       register u_char *pf;

 
 

-       default:
-               error = fioctl(fp, (int)TIOCGPGRP, (caddr_t)valuep);
-               *valuep = -*valuep;
-               return (error);
-       }
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);
+       pf = (u_char *)&fdp->fd_ofileflags[fd];
+       if (*pf & UF_MAPPED)
+               (void) munmapfd(p, fd);
+       fdp->fd_ofiles[fd] = NULL;
+       while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
+               fdp->fd_lastfile--;
+       if (fd < fdp->fd_freefile)
+               fdp->fd_freefile = fd;
+       *pf = 0;
+       return (closef(fp, p));

 }
 
 }
 

-fsetown(fp, value)
-       struct file *fp;
-       int value;
+#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
+/*
+ * Return status information about a file descriptor.
+ */
+/* ARGSUSED */
+int
+compat_43_fstat(p, uap, retval)
+       struct proc *p;
+       register struct compat_43_fstat_args /* {
+               syscallarg(int) fd;
+               syscallarg(struct ostat *) sb;
+       } */ *uap;
+       register_t *retval;

 {
 {

+       int fd = SCARG(uap, fd);
+       register struct filedesc *fdp = p->p_fd;
+       register struct file *fp;
+       struct stat ub;
+       struct ostat oub;
+       int error;

 
 

-       if (fp->f_type == DTYPE_SOCKET) {
-               ((struct socket *)fp->f_data)->so_pgrp = value;
-               return (0);
-       }
-       if (value > 0) {
-               struct proc *p = pfind(value);
-               if (p == 0)
-                       return (ESRCH);
-               value = p->p_pgrp;
-       } else
-               value = -value;
-       return (fioctl(fp, (int)TIOCSPGRP, (caddr_t)&value));
-}
-
-fioctl(fp, cmd, value)
-       struct file *fp;
-       int cmd;
-       caddr_t value;
-{
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);
+       switch (fp->f_type) {

 
 

-       return ((*fp->f_ops->fo_ioctl)(fp, cmd, value));
-}
+       case DTYPE_VNODE:
+               error = vn_stat((struct vnode *)fp->f_data, &ub, p);
+               break;

 
 

-close()
-{
-       struct a {
-               int     i;
-       } *uap = (struct a *)u.u_ap;
-       register int i = uap->i;
-       register struct file *fp;
-       register u_char *pf;
+       case DTYPE_SOCKET:
+               error = soo_stat((struct socket *)fp->f_data, &ub);
+               break;

 
 

-       GETF(fp, i);
-       pf = (u_char *)&u.u_pofile[i];
-       if (*pf & UF_MAPPED)
-               munmapfd(i);
-       u.u_ofile[i] = NULL;
-       while (u.u_lastfile >= 0 && u.u_ofile[u.u_lastfile] == NULL)
-               u.u_lastfile--;
-       *pf = 0;
-       closef(fp);
-       /* WHAT IF u.u_error ? */
+       default:
+               panic("ofstat");
+               /*NOTREACHED*/
+       }
+       cvtstat(&ub, &oub);
+       if (error == 0)
+               error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb),
+                   sizeof (oub));
+       return (error);

 }
 }

+#endif /* COMPAT_43 || COMPAT_SUNOS */

 
 

-fstat()
+/*
+ * Return status information about a file descriptor.
+ */
+/* ARGSUSED */
+int
+fstat(p, uap, retval)
+       struct proc *p;
+       register struct fstat_args /* {
+               syscallarg(int) fd;
+               syscallarg(struct stat *) sb;
+       } */ *uap;
+       register_t *retval;

 {
 {

+       int fd = SCARG(uap, fd);
+       register struct filedesc *fdp = p->p_fd;

        register struct file *fp;
        register struct file *fp;

-       register struct a {
-               int     fdes;
-               struct  stat *sb;
-       } *uap;

        struct stat ub;
        struct stat ub;

+       int error;

 
 

-       uap = (struct a *)u.u_ap;
-       GETF(fp, uap->fdes);
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);

        switch (fp->f_type) {
 
        switch (fp->f_type) {
 

-       case DTYPE_INODE:
-               u.u_error = ino_stat((struct inode *)fp->f_data, &ub);
+       case DTYPE_VNODE:
+               error = vn_stat((struct vnode *)fp->f_data, &ub, p);

                break;
 
        case DTYPE_SOCKET:
                break;
 
        case DTYPE_SOCKET:

-               u.u_error = soo_stat((struct socket *)fp->f_data, &ub);
+               error = soo_stat((struct socket *)fp->f_data, &ub);

                break;
 
        default:
                panic("fstat");
                /*NOTREACHED*/
        }
                break;
 
        default:
                panic("fstat");
                /*NOTREACHED*/
        }

-       if (u.u_error == 0)
-               u.u_error = copyout((caddr_t)&ub, (caddr_t)uap->sb,
+       if (error == 0)
+               error = copyout((caddr_t)&ub, (caddr_t)SCARG(uap, sb),

                    sizeof (ub));
                    sizeof (ub));

+       return (error);

 }
 
 /*
 }
 
 /*

- * Allocate a user file descriptor.
+ * Return pathconf information about a file descriptor.

  */
  */

-ufalloc(i)
-       register int i;
+/* ARGSUSED */
+int
+fpathconf(p, uap, retval)
+       struct proc *p;
+       register struct fpathconf_args /* {
+               syscallarg(int) fd;
+               syscallarg(int) name;
+       } */ *uap;
+       register_t *retval;

 {
 {

+       int fd = SCARG(uap, fd);
+       struct filedesc *fdp = p->p_fd;
+       struct file *fp;
+       struct vnode *vp;

 
 

-       for (; i < NOFILE; i++)
-               if (u.u_ofile[i] == NULL) {
-                       u.u_r.r_val1 = i;
-                       u.u_pofile[i] = 0;
-                       if (i > u.u_lastfile)
-                               u.u_lastfile = i;
-                       return (i);
-               }
-       u.u_error = EMFILE;
-       return (-1);
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);
+       switch (fp->f_type) {
+
+       case DTYPE_SOCKET:
+               if (SCARG(uap, name) != _PC_PIPE_BUF)
+                       return (EINVAL);
+               *retval = PIPE_BUF;
+               return (0);
+
+       case DTYPE_VNODE:
+               vp = (struct vnode *)fp->f_data;
+               return (VOP_PATHCONF(vp, SCARG(uap, name), retval));
+
+       default:
+               panic("fpathconf");
+       }
+       /*NOTREACHED*/

 }
 
 }
 

-ufavail()
+/*
+ * Allocate a file descriptor for the process.
+ */
+int fdexpand;
+
+int
+fdalloc(p, want, result)
+       struct proc *p;
+       int want;
+       int *result;

 {
 {

-       register int i, avail = 0;
+       register struct filedesc *fdp = p->p_fd;
+       register int i;
+       int lim, last, nfiles;
+       struct file **newofile;
+       char *newofileflags;
+
+       /*
+        * Search for a free descriptor starting at the higher
+        * of want or fd_freefile.  If that fails, consider
+        * expanding the ofile array.
+        */
+       lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
+       for (;;) {
+               last = min(fdp->fd_nfiles, lim);
+               if ((i = want) < fdp->fd_freefile)
+                       i = fdp->fd_freefile;
+               for (; i < last; i++) {
+                       if (fdp->fd_ofiles[i] == NULL) {
+                               fdp->fd_ofileflags[i] = 0;
+                               if (i > fdp->fd_lastfile)
+                                       fdp->fd_lastfile = i;
+                               if (want <= fdp->fd_freefile)
+                                       fdp->fd_freefile = i;
+                               *result = i;
+                               return (0);
+                       }
+               }

 
 

-       for (i = 0; i < NOFILE; i++)
-               if (u.u_ofile[i] == NULL)
-                       avail++;
-       return (avail);
+               /*
+                * No space in current array.  Expand?
+                */
+               if (fdp->fd_nfiles >= lim)
+                       return (EMFILE);
+               if (fdp->fd_nfiles < NDEXTENT)
+                       nfiles = NDEXTENT;
+               else
+                       nfiles = 2 * fdp->fd_nfiles;
+               MALLOC(newofile, struct file **, nfiles * OFILESIZE,
+                   M_FILEDESC, M_WAITOK);
+               newofileflags = (char *) &newofile[nfiles];
+               /*
+                * Copy the existing ofile and ofileflags arrays
+                * and zero the new portion of each array.
+                */
+               bcopy(fdp->fd_ofiles, newofile,
+                       (i = sizeof(struct file *) * fdp->fd_nfiles));
+               bzero((char *)newofile + i, nfiles * sizeof(struct file *) - i);
+               bcopy(fdp->fd_ofileflags, newofileflags,
+                       (i = sizeof(char) * fdp->fd_nfiles));
+               bzero(newofileflags + i, nfiles * sizeof(char) - i);
+               if (fdp->fd_nfiles > NDFILE)
+                       FREE(fdp->fd_ofiles, M_FILEDESC);
+               fdp->fd_ofiles = newofile;
+               fdp->fd_ofileflags = newofileflags;
+               fdp->fd_nfiles = nfiles;
+               fdexpand++;
+       }

 }
 
 }
 

-struct file *lastf;

 /*
 /*

- * Allocate a user file descriptor
- * and a file structure.
- * Initialize the descriptor
- * to point at the file structure.
+ * Check to see whether n user file descriptors
+ * are available to the process p.

  */
  */

-struct file *
-falloc()
+int
+fdavail(p, n)
+       struct proc *p;
+       register int n;

 {
 {

-       register struct file *fp;
-       register i;
-
-       i = ufalloc(0);
-       if (i < 0)
-               return (NULL);
-       if (lastf == 0)
-               lastf = file;
-       for (fp = lastf; fp < fileNFILE; fp++)
-               if (fp->f_count == 0)
-                       goto slot;
-       for (fp = file; fp < lastf; fp++)
-               if (fp->f_count == 0)
-                       goto slot;
-       tablefull("file");
-       u.u_error = ENFILE;
-       return (NULL);
-slot:
-       u.u_ofile[i] = fp;
-       fp->f_count = 1;
-       fp->f_data = 0;
-       fp->f_offset = 0;
-       lastf = fp + 1;
-       return (fp);
+       register struct filedesc *fdp = p->p_fd;
+       register struct file **fpp;
+       register int i, lim;
+
+       lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
+       if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
+               return (1);
+       fpp = &fdp->fd_ofiles[fdp->fd_freefile];
+       for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++)
+               if (*fpp == NULL && --n <= 0)
+                       return (1);
+       return (0);

 }
 
 /*
 }
 
 /*

- * Convert a user supplied file descriptor into a pointer
- * to a file structure.  Only task is to check range of the descriptor.
- * Critical paths should use the GETF macro.
+ * Create a new open file structure and allocate
+ * a file decriptor for the process that refers to it.

  */
  */

-struct file *
-getf(f)
-       register int f;
+int
+falloc(p, resultfp, resultfd)
+       register struct proc *p;
+       struct file **resultfp;
+       int *resultfd;

 {
 {

+       register struct file *fp, *fq;
+       int error, i;
+
+       if (error = fdalloc(p, 0, &i))
+               return (error);
+       if (nfiles >= maxfiles) {
+               tablefull("file");
+               return (ENFILE);
+       }
+       /*
+        * Allocate a new file descriptor.
+        * If the process has file descriptor zero open, add to the list
+        * of open files at that point, otherwise put it at the front of
+        * the list of open files.
+        */
+       nfiles++;
+       MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK);
+       bzero(fp, sizeof(struct file));
+       if (fq = p->p_fd->fd_ofiles[0]) {
+               LIST_INSERT_AFTER(fq, fp, f_list);
+       } else {
+               LIST_INSERT_HEAD(&filehead, fp, f_list);
+       }
+       p->p_fd->fd_ofiles[i] = fp;
+       fp->f_count = 1;
+       fp->f_cred = p->p_ucred;
+       crhold(fp->f_cred);
+       if (resultfp)
+               *resultfp = fp;
+       if (resultfd)
+               *resultfd = i;
+       return (0);
+}
+
+/*
+ * Free a file descriptor.
+ */
+void
+ffree(fp)

        register struct file *fp;
        register struct file *fp;

+{
+       register struct file *fq;

 
 

-       if ((unsigned)f >= NOFILE || (fp = u.u_ofile[f]) == NULL) {
-               u.u_error = EBADF;
-               return (NULL);
+       LIST_REMOVE(fp, f_list);
+       crfree(fp->f_cred);
+#ifdef DIAGNOSTIC
+       fp->f_count = 0;
+#endif
+       nfiles--;
+       FREE(fp, M_FILE);
+}
+
+/*
+ * Copy a filedesc structure.
+ */
+struct filedesc *
+fdcopy(p)
+       struct proc *p;
+{
+       register struct filedesc *newfdp, *fdp = p->p_fd;
+       register struct file **fpp;
+       register int i;
+
+       MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0),
+           M_FILEDESC, M_WAITOK);
+       bcopy(fdp, newfdp, sizeof(struct filedesc));
+       VREF(newfdp->fd_cdir);
+       if (newfdp->fd_rdir)
+               VREF(newfdp->fd_rdir);
+       newfdp->fd_refcnt = 1;
+
+       /*
+        * If the number of open files fits in the internal arrays
+        * of the open file structure, use them, otherwise allocate
+        * additional memory for the number of descriptors currently
+        * in use.
+        */
+       if (newfdp->fd_lastfile < NDFILE) {
+               newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles;
+               newfdp->fd_ofileflags =
+                   ((struct filedesc0 *) newfdp)->fd_dfileflags;
+               i = NDFILE;
+       } else {
+               /*
+                * Compute the smallest multiple of NDEXTENT needed
+                * for the file descriptors currently in use,
+                * allowing the table to shrink.
+                */
+               i = newfdp->fd_nfiles;
+               while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2)
+                       i /= 2;
+               MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE,
+                   M_FILEDESC, M_WAITOK);
+               newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];

        }
        }

-       return (fp);
+       newfdp->fd_nfiles = i;
+       bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **));
+       bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char));
+       fpp = newfdp->fd_ofiles;
+       for (i = newfdp->fd_lastfile; i-- >= 0; fpp++)
+               if (*fpp != NULL)
+                       (*fpp)->f_count++;
+       return (newfdp);
+}
+
+/*
+ * Release a filedesc structure.
+ */
+void
+fdfree(p)
+       struct proc *p;
+{
+       register struct filedesc *fdp = p->p_fd;
+       struct file **fpp;
+       register int i;
+
+       if (--fdp->fd_refcnt > 0)
+               return;
+       fpp = fdp->fd_ofiles;
+       for (i = fdp->fd_lastfile; i-- >= 0; fpp++)
+               if (*fpp)
+                       (void) closef(*fpp, p);
+       if (fdp->fd_nfiles > NDFILE)
+               FREE(fdp->fd_ofiles, M_FILEDESC);
+       vrele(fdp->fd_cdir);
+       if (fdp->fd_rdir)
+               vrele(fdp->fd_rdir);
+       FREE(fdp, M_FILEDESC);

 }
 
 /*
  * Internal form of close.
  * Decrement reference count on file structure.
 }
 
 /*
  * Internal form of close.
  * Decrement reference count on file structure.

+ * Note: p may be NULL when closing a file
+ * that was being passed in a message.

  */
  */

-closef(fp)
+int
+closef(fp, p)

        register struct file *fp;
        register struct file *fp;

+       register struct proc *p;

 {
 {

+       struct vnode *vp;
+       struct flock lf;
+       int error;

 
        if (fp == NULL)
 
        if (fp == NULL)

-               return;
-       if (fp->f_count > 1) {
-               fp->f_count--;
-               return;
+               return (0);
+       /*
+        * POSIX record locking dictates that any close releases ALL
+        * locks owned by this process.  This is handled by setting
+        * a flag in the unlock to free ONLY locks obeying POSIX
+        * semantics, and not to free BSD-style file locks.
+        * If the descriptor was in a message, POSIX-style locks
+        * aren't passed with the descriptor.
+        */
+       if (p && (p->p_flag & P_ADVLOCK) && fp->f_type == DTYPE_VNODE) {
+               lf.l_whence = SEEK_SET;
+               lf.l_start = 0;
+               lf.l_len = 0;
+               lf.l_type = F_UNLCK;
+               vp = (struct vnode *)fp->f_data;
+               (void) VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX);

        }
        }

-       (*fp->f_ops->fo_close)(fp);
-       fp->f_count = 0;
+       if (--fp->f_count > 0)
+               return (0);
+       if (fp->f_count < 0)
+               panic("closef: count < 0");
+       if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) {
+               lf.l_whence = SEEK_SET;
+               lf.l_start = 0;
+               lf.l_len = 0;
+               lf.l_type = F_UNLCK;
+               vp = (struct vnode *)fp->f_data;
+               (void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
+       }
+       if (fp->f_ops)
+               error = (*fp->f_ops->fo_close)(fp, p);
+       else
+               error = 0;
+       ffree(fp);
+       return (error);

 }
 
 /*
  * Apply an advisory lock on a file descriptor.
 }
 
 /*
  * Apply an advisory lock on a file descriptor.

+ *
+ * Just attempt to get a record lock of the requested type on
+ * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).

  */
  */

-flock()
+/* ARGSUSED */
+int
+flock(p, uap, retval)
+       struct proc *p;
+       register struct flock_args /* {
+               syscallarg(int) fd;
+               syscallarg(int) how;
+       } */ *uap;
+       register_t *retval;

 {
 {

-       register struct a {
-               int     fd;
-               int     how;
-       } *uap = (struct a *)u.u_ap;
+       int fd = SCARG(uap, fd);
+       int how = SCARG(uap, how);
+       register struct filedesc *fdp = p->p_fd;

        register struct file *fp;
        register struct file *fp;

-
-       GETF(fp, uap->fd);
-       if (fp->f_type != DTYPE_INODE) {
-               u.u_error = EOPNOTSUPP;
-               return;
+       struct vnode *vp;
+       struct flock lf;
+
+       if ((u_int)fd >= fdp->fd_nfiles ||
+           (fp = fdp->fd_ofiles[fd]) == NULL)
+               return (EBADF);
+       if (fp->f_type != DTYPE_VNODE)
+               return (EOPNOTSUPP);
+       vp = (struct vnode *)fp->f_data;
+       lf.l_whence = SEEK_SET;
+       lf.l_start = 0;
+       lf.l_len = 0;
+       if (how & LOCK_UN) {
+               lf.l_type = F_UNLCK;
+               fp->f_flag &= ~FHASLOCK;
+               return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK));

        }
        }

-       if (uap->how & LOCK_UN) {
-               ino_unlock(fp, FSHLOCK|FEXLOCK);
-               return;
+       if (how & LOCK_EX)
+               lf.l_type = F_WRLCK;
+       else if (how & LOCK_SH)
+               lf.l_type = F_RDLCK;
+       else
+               return (EBADF);
+       fp->f_flag |= FHASLOCK;
+       if (how & LOCK_NB)
+               return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK));
+       return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT));
+}
+
+/*
+ * File Descriptor pseudo-device driver (/dev/fd/).
+ *
+ * Opening minor device N dup()s the file (if any) connected to file
+ * descriptor N belonging to the calling process.  Note that this driver
+ * consists of only the ``open()'' routine, because all subsequent
+ * references to this file will be direct to the other driver.
+ */
+/* ARGSUSED */
+int
+fdopen(dev, mode, type, p)
+       dev_t dev;
+       int mode, type;
+       struct proc *p;
+{
+
+       /*
+        * XXX Kludge: set curproc->p_dupfd to contain the value of the
+        * the file descriptor being sought for duplication. The error 
+        * return ensures that the vnode for this device will be released
+        * by vn_open. Open will detect this special error and take the
+        * actions in dupfdopen below. Other callers of vn_open or VOP_OPEN
+        * will simply report the error.
+        */
+       p->p_dupfd = minor(dev);
+       return (ENODEV);
+}
+
+/*
+ * Duplicate the specified descriptor to a free descriptor.
+ */
+int
+dupfdopen(fdp, indx, dfd, mode, error)
+       register struct filedesc *fdp;
+       register int indx, dfd;
+       int mode;
+       int error;
+{
+       register struct file *wfp;
+       struct file *fp;
+
+       /*
+        * If the to-be-dup'd fd number is greater than the allowed number
+        * of file descriptors, or the fd to be dup'd has already been
+        * closed, reject.  Note, check for new == old is necessary as
+        * falloc could allocate an already closed to-be-dup'd descriptor
+        * as the new descriptor.
+        */
+       fp = fdp->fd_ofiles[indx];
+       if ((u_int)dfd >= fdp->fd_nfiles ||
+           (wfp = fdp->fd_ofiles[dfd]) == NULL || fp == wfp)
+               return (EBADF);
+
+       /*
+        * There are two cases of interest here.
+        *
+        * For ENODEV simply dup (dfd) to file descriptor
+        * (indx) and return.
+        *
+        * For ENXIO steal away the file structure from (dfd) and
+        * store it in (indx).  (dfd) is effectively closed by
+        * this operation.
+        *
+        * Any other error code is just returned.
+        */
+       switch (error) {
+       case ENODEV:
+               /*
+                * Check that the mode the file is being opened for is a
+                * subset of the mode of the existing descriptor.
+                */
+               if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag)
+                       return (EACCES);
+               fdp->fd_ofiles[indx] = wfp;
+               fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
+               wfp->f_count++;
+               if (indx > fdp->fd_lastfile)
+                       fdp->fd_lastfile = indx;
+               return (0);
+
+       case ENXIO:
+               /*
+                * Steal away the file pointer from dfd, and stuff it into indx.
+                */
+               fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd];
+               fdp->fd_ofiles[dfd] = NULL;
+               fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
+               fdp->fd_ofileflags[dfd] = 0;
+               /*
+                * Complete the clean up of the filedesc structure by
+                * recomputing the various hints.
+                */
+               if (indx > fdp->fd_lastfile)
+                       fdp->fd_lastfile = indx;
+               else
+                       while (fdp->fd_lastfile > 0 &&
+                              fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
+                               fdp->fd_lastfile--;
+                       if (dfd < fdp->fd_freefile)
+                               fdp->fd_freefile = dfd;
+               return (0);
+
+       default:
+               return (error);

        }
        }

-       if ((uap->how & (LOCK_SH | LOCK_EX)) == 0)
-               return;                                 /* error? */
-       if (uap->how & LOCK_EX)
-               uap->how &= ~LOCK_SH;
-       /* avoid work... */
-       if ((fp->f_flag & FEXLOCK) && (uap->how & LOCK_EX) ||
-           (fp->f_flag & FSHLOCK) && (uap->how & LOCK_SH))
-               return;
-       u.u_error = ino_lock(fp, uap->how);
+       /* NOTREACHED */

 }
 }