ea579a477d
reading/writing of mem and regs). Also have to check for the requesting process being group KMEM -- this is a bit of a hack, but ps et al need it. Reviewed by: davidg
1018 lines
26 KiB
C
1018 lines
26 KiB
C
/*
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* Copyright (c) 1993, 1995 Jan-Simon Pendry
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* Copyright (c) 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
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*
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* $Id: procfs_vnops.c,v 1.30 1997/08/02 14:32:20 bde Exp $
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*/
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/*
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* procfs vnode interface
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/proc.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/dirent.h>
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#include <machine/reg.h>
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#include <miscfs/procfs/procfs.h>
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static int procfs_abortop __P((struct vop_abortop_args *));
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static int procfs_access __P((struct vop_access_args *));
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static int procfs_badop __P((void));
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static int procfs_bmap __P((struct vop_bmap_args *));
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static int procfs_close __P((struct vop_close_args *));
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static int procfs_getattr __P((struct vop_getattr_args *));
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static int procfs_inactive __P((struct vop_inactive_args *));
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static int procfs_ioctl __P((struct vop_ioctl_args *));
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static int procfs_lookup __P((struct vop_lookup_args *));
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static int procfs_open __P((struct vop_open_args *));
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static int procfs_pathconf __P((struct vop_pathconf_args *ap));
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static int procfs_print __P((struct vop_print_args *));
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static int procfs_readdir __P((struct vop_readdir_args *));
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static int procfs_readlink __P((struct vop_readlink_args *));
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static int procfs_reclaim __P((struct vop_reclaim_args *));
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static int procfs_setattr __P((struct vop_setattr_args *));
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/*
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* This is a list of the valid names in the
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* process-specific sub-directories. It is
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* used in procfs_lookup and procfs_readdir
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*/
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struct proc_target {
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u_char pt_type;
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u_char pt_namlen;
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char *pt_name;
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pfstype pt_pfstype;
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int (*pt_valid) __P((struct proc *p));
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} proc_targets[] = {
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#define N(s) sizeof(s)-1, s
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/* name type validp */
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{ DT_DIR, N("."), Pproc, NULL },
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{ DT_DIR, N(".."), Proot, NULL },
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{ DT_REG, N("file"), Pfile, procfs_validfile },
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{ DT_REG, N("mem"), Pmem, NULL },
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{ DT_REG, N("regs"), Pregs, procfs_validregs },
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{ DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
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{ DT_REG, N("ctl"), Pctl, NULL },
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{ DT_REG, N("status"), Pstatus, NULL },
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{ DT_REG, N("note"), Pnote, NULL },
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{ DT_REG, N("notepg"), Pnotepg, NULL },
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{ DT_REG, N("map"), Pmap, procfs_validmap },
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{ DT_REG, N("etype"), Ptype, procfs_validtype },
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#undef N
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};
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static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
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static pid_t atopid __P((const char *, u_int));
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/*
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* set things up for doing i/o on
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* the pfsnode (vp). (vp) is locked
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* on entry, and should be left locked
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* on exit.
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*
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* for procfs we don't need to do anything
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* in particular for i/o. all that is done
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* is to support exclusive open on process
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* memory images.
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*/
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static int
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procfs_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct pfsnode *pfs = VTOPFS(ap->a_vp);
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struct proc *p1 = ap->a_p, *p2 = PFIND(pfs->pfs_pid);
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if (p2 == NULL)
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return ENOENT;
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switch (pfs->pfs_type) {
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case Pmem:
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if ((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL) ||
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(pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE))
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return (EBUSY);
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if (!CHECKIO(p1, p2) &&
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(p1->p_cred->pc_ucred->cr_gid != KMEM_GROUP))
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return EPERM;
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if (ap->a_mode & FWRITE)
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pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
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return (0);
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default:
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break;
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}
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return (0);
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}
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/*
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* close the pfsnode (vp) after doing i/o.
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* (vp) is not locked on entry or exit.
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*
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* nothing to do for procfs other than undo
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* any exclusive open flag (see _open above).
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*/
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static int
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procfs_close(ap)
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct pfsnode *pfs = VTOPFS(ap->a_vp);
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switch (pfs->pfs_type) {
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case Pmem:
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if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
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pfs->pfs_flags &= ~(FWRITE|O_EXCL);
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break;
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default:
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break;
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}
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return (0);
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}
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/*
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* do an ioctl operation on pfsnode (vp).
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* (vp) is not locked on entry or exit.
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*/
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static int
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procfs_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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return (ENOTTY);
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}
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/*
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* do block mapping for pfsnode (vp).
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* since we don't use the buffer cache
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* for procfs this function should never
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* be called. in any case, it's not clear
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* what part of the kernel ever makes use
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* of this function. for sanity, this is the
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* usual no-op bmap, although returning
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* (EIO) would be a reasonable alternative.
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*/
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static int
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procfs_bmap(ap)
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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int *a_runp;
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} */ *ap;
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{
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if (ap->a_vpp != NULL)
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*ap->a_vpp = ap->a_vp;
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if (ap->a_bnp != NULL)
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*ap->a_bnp = ap->a_bn;
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if (ap->a_runp != NULL)
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*ap->a_runp = 0;
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return (0);
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}
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/*
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* procfs_inactive is called when the pfsnode
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* is vrele'd and the reference count goes
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* to zero. (vp) will be on the vnode free
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* list, so to get it back vget() must be
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* used.
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*
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* for procfs, check if the process is still
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* alive and if it isn't then just throw away
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* the vnode by calling vgone(). this may
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* be overkill and a waste of time since the
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* chances are that the process will still be
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* there and PFIND is not free.
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*
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* (vp) is locked on entry, but must be unlocked on exit.
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*/
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static int
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procfs_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct pfsnode *pfs = VTOPFS(vp);
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VOP_UNLOCK(vp, 0, ap->a_p);
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if (PFIND(pfs->pfs_pid) == 0)
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vgone(vp);
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return (0);
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}
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/*
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* _reclaim is called when getnewvnode()
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* wants to make use of an entry on the vnode
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* free list. at this time the filesystem needs
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* to free any private data and remove the node
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* from any private lists.
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*/
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static int
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procfs_reclaim(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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return (procfs_freevp(ap->a_vp));
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}
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/*
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* Return POSIX pathconf information applicable to special devices.
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*/
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static int
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procfs_pathconf(ap)
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struct vop_pathconf_args /* {
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struct vnode *a_vp;
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int a_name;
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int *a_retval;
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} */ *ap;
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{
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switch (ap->a_name) {
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case _PC_LINK_MAX:
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*ap->a_retval = LINK_MAX;
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return (0);
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case _PC_MAX_CANON:
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*ap->a_retval = MAX_CANON;
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return (0);
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case _PC_MAX_INPUT:
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*ap->a_retval = MAX_INPUT;
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return (0);
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case _PC_PIPE_BUF:
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*ap->a_retval = PIPE_BUF;
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return (0);
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case _PC_CHOWN_RESTRICTED:
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*ap->a_retval = 1;
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return (0);
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case _PC_VDISABLE:
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*ap->a_retval = _POSIX_VDISABLE;
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return (0);
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default:
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return (EINVAL);
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}
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/* NOTREACHED */
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}
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|
|
/*
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* _print is used for debugging.
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* just print a readable description
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* of (vp).
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*/
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static int
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procfs_print(ap)
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struct vop_print_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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struct pfsnode *pfs = VTOPFS(ap->a_vp);
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printf("tag VT_PROCFS, type %s, pid %d, mode %x, flags %x\n",
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pfs->pfs_type, pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
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return (0);
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}
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|
|
/*
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* _abortop is called when operations such as
|
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* rename and create fail. this entry is responsible
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* for undoing any side-effects caused by the lookup.
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* this will always include freeing the pathname buffer.
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*/
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static int
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procfs_abortop(ap)
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struct vop_abortop_args /* {
|
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struct vnode *a_dvp;
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struct componentname *a_cnp;
|
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} */ *ap;
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{
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|
|
|
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
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FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
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return (0);
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}
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|
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/*
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* generic entry point for unsupported operations
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*/
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static int
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procfs_badop()
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{
|
|
|
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return (EIO);
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}
|
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|
|
/*
|
|
* Invent attributes for pfsnode (vp) and store
|
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* them in (vap).
|
|
* Directories lengths are returned as zero since
|
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* any real length would require the genuine size
|
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* to be computed, and nothing cares anyway.
|
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*
|
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* this is relatively minimal for procfs.
|
|
*/
|
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static int
|
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procfs_getattr(ap)
|
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struct vop_getattr_args /* {
|
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struct vnode *a_vp;
|
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struct vattr *a_vap;
|
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struct ucred *a_cred;
|
|
struct proc *a_p;
|
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} */ *ap;
|
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{
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struct pfsnode *pfs = VTOPFS(ap->a_vp);
|
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struct vattr *vap = ap->a_vap;
|
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struct proc *procp;
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int error;
|
|
|
|
/*
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|
* First make sure that the process and its credentials
|
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* still exist.
|
|
*/
|
|
switch (pfs->pfs_type) {
|
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case Proot:
|
|
case Pcurproc:
|
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procp = 0;
|
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break;
|
|
|
|
default:
|
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procp = PFIND(pfs->pfs_pid);
|
|
if (procp == 0 || procp->p_cred == NULL ||
|
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procp->p_ucred == NULL)
|
|
return (ENOENT);
|
|
}
|
|
|
|
error = 0;
|
|
|
|
/* start by zeroing out the attributes */
|
|
VATTR_NULL(vap);
|
|
|
|
/* next do all the common fields */
|
|
vap->va_type = ap->a_vp->v_type;
|
|
vap->va_mode = pfs->pfs_mode;
|
|
vap->va_fileid = pfs->pfs_fileno;
|
|
vap->va_flags = 0;
|
|
vap->va_blocksize = PAGE_SIZE;
|
|
vap->va_bytes = vap->va_size = 0;
|
|
|
|
/*
|
|
* Make all times be current TOD.
|
|
* It would be possible to get the process start
|
|
* time from the p_stat structure, but there's
|
|
* no "file creation" time stamp anyway, and the
|
|
* p_stat structure is not addressible if u. gets
|
|
* swapped out for that process.
|
|
*/
|
|
{
|
|
struct timeval tv;
|
|
microtime(&tv);
|
|
TIMEVAL_TO_TIMESPEC(&tv, &vap->va_ctime);
|
|
}
|
|
vap->va_atime = vap->va_mtime = vap->va_ctime;
|
|
|
|
/*
|
|
* If the process has exercised some setuid or setgid
|
|
* privilege, then rip away read/write permission so
|
|
* that only root can gain access.
|
|
*/
|
|
switch (pfs->pfs_type) {
|
|
case Pctl:
|
|
case Pregs:
|
|
case Pfpregs:
|
|
if (procp->p_flag & P_SUGID)
|
|
vap->va_mode &= ~((VREAD|VWRITE)|
|
|
((VREAD|VWRITE)>>3)|
|
|
((VREAD|VWRITE)>>6));
|
|
break;
|
|
case Pmem:
|
|
/* Retain group kmem readablity. */
|
|
if (procp->p_flag & P_SUGID)
|
|
vap->va_mode &= ~(VREAD|VWRITE);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* now do the object specific fields
|
|
*
|
|
* The size could be set from struct reg, but it's hardly
|
|
* worth the trouble, and it puts some (potentially) machine
|
|
* dependent data into this machine-independent code. If it
|
|
* becomes important then this function should break out into
|
|
* a per-file stat function in the corresponding .c file.
|
|
*/
|
|
|
|
switch (pfs->pfs_type) {
|
|
case Proot:
|
|
/*
|
|
* Set nlink to 1 to tell fts(3) we don't actually know.
|
|
*/
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = 0;
|
|
vap->va_gid = 0;
|
|
vap->va_size = vap->va_bytes = DEV_BSIZE;
|
|
break;
|
|
|
|
case Pcurproc: {
|
|
char buf[16]; /* should be enough */
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = 0;
|
|
vap->va_gid = 0;
|
|
vap->va_size = vap->va_bytes =
|
|
sprintf(buf, "%ld", (long)curproc->p_pid);
|
|
break;
|
|
}
|
|
|
|
case Pproc:
|
|
vap->va_nlink = nproc_targets;
|
|
vap->va_uid = procp->p_ucred->cr_uid;
|
|
vap->va_gid = procp->p_ucred->cr_gid;
|
|
vap->va_size = vap->va_bytes = DEV_BSIZE;
|
|
break;
|
|
|
|
case Pfile:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
case Pmem:
|
|
vap->va_nlink = 1;
|
|
/*
|
|
* If we denied owner access earlier, then we have to
|
|
* change the owner to root - otherwise 'ps' and friends
|
|
* will break even though they are setgid kmem. *SIGH*
|
|
*/
|
|
if (procp->p_flag & P_SUGID)
|
|
vap->va_uid = 0;
|
|
else
|
|
vap->va_uid = procp->p_ucred->cr_uid;
|
|
vap->va_gid = KMEM_GROUP;
|
|
break;
|
|
|
|
case Ptype:
|
|
case Pmap:
|
|
case Pregs:
|
|
vap->va_bytes = vap->va_size = sizeof(struct reg);
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = procp->p_ucred->cr_uid;
|
|
vap->va_gid = procp->p_ucred->cr_gid;
|
|
break;
|
|
|
|
case Pfpregs:
|
|
vap->va_bytes = vap->va_size = sizeof(struct fpreg);
|
|
|
|
case Pctl:
|
|
case Pstatus:
|
|
case Pnote:
|
|
case Pnotepg:
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = procp->p_ucred->cr_uid;
|
|
vap->va_gid = procp->p_ucred->cr_gid;
|
|
break;
|
|
|
|
default:
|
|
panic("procfs_getattr");
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
procfs_setattr(ap)
|
|
struct vop_setattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
/*
|
|
* just fake out attribute setting
|
|
* it's not good to generate an error
|
|
* return, otherwise things like creat()
|
|
* will fail when they try to set the
|
|
* file length to 0. worse, this means
|
|
* that echo $note > /proc/$pid/note will fail.
|
|
*/
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* implement access checking.
|
|
*
|
|
* something very similar to this code is duplicated
|
|
* throughout the 4bsd kernel and should be moved
|
|
* into kern/vfs_subr.c sometime.
|
|
*
|
|
* actually, the check for super-user is slightly
|
|
* broken since it will allow read access to write-only
|
|
* objects. this doesn't cause any particular trouble
|
|
* but does mean that the i/o entry points need to check
|
|
* that the operation really does make sense.
|
|
*/
|
|
static int
|
|
procfs_access(ap)
|
|
struct vop_access_args /* {
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct vattr *vap;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
/*
|
|
* If you're the super-user,
|
|
* you always get access.
|
|
*/
|
|
if (ap->a_cred->cr_uid == 0)
|
|
return (0);
|
|
|
|
vap = &vattr;
|
|
error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Access check is based on only one of owner, group, public.
|
|
* If not owner, then check group. If not a member of the
|
|
* group, then check public access.
|
|
*/
|
|
if (ap->a_cred->cr_uid != vap->va_uid) {
|
|
gid_t *gp;
|
|
int i;
|
|
|
|
ap->a_mode >>= 3;
|
|
gp = ap->a_cred->cr_groups;
|
|
for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
|
|
if (vap->va_gid == *gp)
|
|
goto found;
|
|
ap->a_mode >>= 3;
|
|
found:
|
|
;
|
|
}
|
|
|
|
if ((vap->va_mode & ap->a_mode) == ap->a_mode)
|
|
return (0);
|
|
|
|
return (EACCES);
|
|
}
|
|
|
|
/*
|
|
* lookup. this is incredibly complicated in the
|
|
* general case, however for most pseudo-filesystems
|
|
* very little needs to be done.
|
|
*
|
|
* unless you want to get a migraine, just make sure your
|
|
* filesystem doesn't do any locking of its own. otherwise
|
|
* read and inwardly digest ufs_lookup().
|
|
*/
|
|
static int
|
|
procfs_lookup(ap)
|
|
struct vop_lookup_args /* {
|
|
struct vnode * a_dvp;
|
|
struct vnode ** a_vpp;
|
|
struct componentname * a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct vnode **vpp = ap->a_vpp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
char *pname = cnp->cn_nameptr;
|
|
struct proc *curp = cnp->cn_proc;
|
|
int error = 0;
|
|
struct proc_target *pt;
|
|
struct vnode *fvp;
|
|
pid_t pid;
|
|
struct pfsnode *pfs;
|
|
struct proc *p;
|
|
int i;
|
|
|
|
*vpp = NULL;
|
|
|
|
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
|
|
return (EROFS);
|
|
|
|
if (cnp->cn_namelen == 1 && *pname == '.') {
|
|
*vpp = dvp;
|
|
VREF(dvp);
|
|
/* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */
|
|
return (0);
|
|
}
|
|
|
|
pfs = VTOPFS(dvp);
|
|
switch (pfs->pfs_type) {
|
|
case Proot:
|
|
if (cnp->cn_flags & ISDOTDOT)
|
|
return (EIO);
|
|
|
|
if (CNEQ(cnp, "curproc", 7))
|
|
return (procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc));
|
|
|
|
pid = atopid(pname, cnp->cn_namelen);
|
|
if (pid == NO_PID)
|
|
break;
|
|
|
|
p = PFIND(pid);
|
|
if (p == 0)
|
|
break;
|
|
|
|
return (procfs_allocvp(dvp->v_mount, vpp, pid, Pproc));
|
|
|
|
case Pproc:
|
|
if (cnp->cn_flags & ISDOTDOT)
|
|
return (procfs_root(dvp->v_mount, vpp));
|
|
|
|
p = PFIND(pfs->pfs_pid);
|
|
if (p == 0)
|
|
break;
|
|
|
|
for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
|
|
if (cnp->cn_namelen == pt->pt_namlen &&
|
|
bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
|
|
(pt->pt_valid == NULL || (*pt->pt_valid)(p)))
|
|
goto found;
|
|
}
|
|
break;
|
|
|
|
found:
|
|
if (pt->pt_pfstype == Pfile) {
|
|
fvp = procfs_findtextvp(p);
|
|
/* We already checked that it exists. */
|
|
VREF(fvp);
|
|
vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, curp);
|
|
*vpp = fvp;
|
|
return (0);
|
|
}
|
|
|
|
return (procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
|
|
pt->pt_pfstype));
|
|
|
|
default:
|
|
return (ENOTDIR);
|
|
}
|
|
|
|
return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
|
|
}
|
|
|
|
/*
|
|
* Does this process have a text file?
|
|
*/
|
|
int
|
|
procfs_validfile(p)
|
|
struct proc *p;
|
|
{
|
|
|
|
return (procfs_findtextvp(p) != NULLVP);
|
|
}
|
|
|
|
/*
|
|
* readdir returns directory entries from pfsnode (vp).
|
|
*
|
|
* the strategy here with procfs is to generate a single
|
|
* directory entry at a time (struct pfsdent) and then
|
|
* copy that out to userland using uiomove. a more efficent
|
|
* though more complex implementation, would try to minimize
|
|
* the number of calls to uiomove(). for procfs, this is
|
|
* hardly worth the added code complexity.
|
|
*
|
|
* this should just be done through read()
|
|
*/
|
|
static int
|
|
procfs_readdir(ap)
|
|
struct vop_readdir_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
u_long *a_cookies;
|
|
int a_ncookies;
|
|
} */ *ap;
|
|
{
|
|
struct uio *uio = ap->a_uio;
|
|
struct pfsdent d;
|
|
struct pfsdent *dp = &d;
|
|
struct pfsnode *pfs;
|
|
int error;
|
|
int count;
|
|
int i;
|
|
|
|
/*
|
|
* We don't allow exporting procfs mounts, and currently local
|
|
* requests do not need cookies.
|
|
*/
|
|
if (ap->a_ncookies)
|
|
panic("procfs_readdir: not hungry");
|
|
|
|
pfs = VTOPFS(ap->a_vp);
|
|
|
|
if (uio->uio_resid < UIO_MX)
|
|
return (EINVAL);
|
|
if (uio->uio_offset & (UIO_MX-1))
|
|
return (EINVAL);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
error = 0;
|
|
count = 0;
|
|
i = uio->uio_offset / UIO_MX;
|
|
|
|
switch (pfs->pfs_type) {
|
|
/*
|
|
* this is for the process-specific sub-directories.
|
|
* all that is needed to is copy out all the entries
|
|
* from the procent[] table (top of this file).
|
|
*/
|
|
case Pproc: {
|
|
struct proc *p;
|
|
struct proc_target *pt;
|
|
|
|
p = PFIND(pfs->pfs_pid);
|
|
if (p == NULL)
|
|
break;
|
|
|
|
for (pt = &proc_targets[i];
|
|
uio->uio_resid >= UIO_MX && i < nproc_targets; pt++, i++) {
|
|
if (pt->pt_valid && (*pt->pt_valid)(p) == 0)
|
|
continue;
|
|
|
|
dp->d_reclen = UIO_MX;
|
|
dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype);
|
|
dp->d_namlen = pt->pt_namlen;
|
|
bcopy(pt->pt_name, dp->d_name, pt->pt_namlen + 1);
|
|
dp->d_type = pt->pt_type;
|
|
|
|
if (error = uiomove((caddr_t)dp, UIO_MX, uio))
|
|
break;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* this is for the root of the procfs filesystem
|
|
* what is needed is a special entry for "curproc"
|
|
* followed by an entry for each process on allproc
|
|
#ifdef PROCFS_ZOMBIE
|
|
* and zombproc.
|
|
#endif
|
|
*/
|
|
|
|
case Proot: {
|
|
#ifdef PROCFS_ZOMBIE
|
|
int doingzomb = 0;
|
|
#endif
|
|
int pcnt = 0;
|
|
volatile struct proc *p = allproc.lh_first;
|
|
|
|
again:
|
|
for (; p && uio->uio_resid >= UIO_MX; i++, pcnt++) {
|
|
bzero((char *) dp, UIO_MX);
|
|
dp->d_reclen = UIO_MX;
|
|
|
|
switch (i) {
|
|
case 0: /* `.' */
|
|
case 1: /* `..' */
|
|
dp->d_fileno = PROCFS_FILENO(0, Proot);
|
|
dp->d_namlen = i + 1;
|
|
bcopy("..", dp->d_name, dp->d_namlen);
|
|
dp->d_name[i + 1] = '\0';
|
|
dp->d_type = DT_DIR;
|
|
break;
|
|
|
|
case 2:
|
|
dp->d_fileno = PROCFS_FILENO(0, Pcurproc);
|
|
dp->d_namlen = 7;
|
|
bcopy("curproc", dp->d_name, 8);
|
|
dp->d_type = DT_LNK;
|
|
break;
|
|
|
|
default:
|
|
while (pcnt < i) {
|
|
pcnt++;
|
|
p = p->p_list.le_next;
|
|
if (!p)
|
|
goto done;
|
|
}
|
|
dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc);
|
|
dp->d_namlen = sprintf(dp->d_name, "%ld",
|
|
(long)p->p_pid);
|
|
dp->d_type = DT_REG;
|
|
p = p->p_list.le_next;
|
|
break;
|
|
}
|
|
|
|
if (error = uiomove((caddr_t)dp, UIO_MX, uio))
|
|
break;
|
|
}
|
|
done:
|
|
|
|
#ifdef PROCFS_ZOMBIE
|
|
if (p == 0 && doingzomb == 0) {
|
|
doingzomb = 1;
|
|
p = zombproc.lh_first;
|
|
goto again;
|
|
}
|
|
#endif
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
default:
|
|
error = ENOTDIR;
|
|
break;
|
|
}
|
|
|
|
uio->uio_offset = i * UIO_MX;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* readlink reads the link of `curproc'
|
|
*/
|
|
static int
|
|
procfs_readlink(ap)
|
|
struct vop_readlink_args *ap;
|
|
{
|
|
struct uio *uio = ap->a_uio;
|
|
char buf[16]; /* should be enough */
|
|
int len;
|
|
|
|
if (VTOPFS(ap->a_vp)->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
|
|
return (EINVAL);
|
|
|
|
len = sprintf(buf, "%ld", (long)curproc->p_pid);
|
|
|
|
return (uiomove((caddr_t)buf, len, ap->a_uio));
|
|
}
|
|
|
|
/*
|
|
* convert decimal ascii to pid_t
|
|
*/
|
|
static pid_t
|
|
atopid(b, len)
|
|
const char *b;
|
|
u_int len;
|
|
{
|
|
pid_t p = 0;
|
|
|
|
while (len--) {
|
|
char c = *b++;
|
|
if (c < '0' || c > '9')
|
|
return (NO_PID);
|
|
p = 10 * p + (c - '0');
|
|
if (p > PID_MAX)
|
|
return (NO_PID);
|
|
}
|
|
|
|
return (p);
|
|
}
|
|
|
|
#define procfs_create ((int (*) __P((struct vop_create_args *))) procfs_badop)
|
|
#define procfs_mknod ((int (*) __P((struct vop_mknod_args *))) procfs_badop)
|
|
#define procfs_read procfs_rw
|
|
#define procfs_write procfs_rw
|
|
#define procfs_select ((int (*) __P((struct vop_select_args *))) procfs_badop)
|
|
#define procfs_mmap ((int (*) __P((struct vop_mmap_args *))) procfs_badop)
|
|
#define procfs_revoke vop_revoke
|
|
#define procfs_fsync ((int (*) __P((struct vop_fsync_args *))) procfs_badop)
|
|
#define procfs_seek ((int (*) __P((struct vop_seek_args *))) procfs_badop)
|
|
#define procfs_remove ((int (*) __P((struct vop_remove_args *))) procfs_badop)
|
|
#define procfs_link ((int (*) __P((struct vop_link_args *))) procfs_badop)
|
|
#define procfs_rename ((int (*) __P((struct vop_rename_args *))) procfs_badop)
|
|
#define procfs_mkdir ((int (*) __P((struct vop_mkdir_args *))) procfs_badop)
|
|
#define procfs_rmdir ((int (*) __P((struct vop_rmdir_args *))) procfs_badop)
|
|
#define procfs_symlink ((int (*) __P((struct vop_symlink_args *))) procfs_badop)
|
|
#define procfs_lock ((int (*) __P((struct vop_lock_args *)))vop_nolock)
|
|
#define procfs_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock)
|
|
#define procfs_strategy ((int (*) __P((struct vop_strategy_args *))) procfs_badop)
|
|
#define procfs_islocked \
|
|
((int (*) __P((struct vop_islocked_args *)))vop_noislocked)
|
|
#define procfs_advlock ((int (*) __P((struct vop_advlock_args *))) procfs_badop)
|
|
#define procfs_blkatoff ((int (*) __P((struct vop_blkatoff_args *))) procfs_badop)
|
|
#define procfs_valloc ((int (*) __P((struct vop_valloc_args *))) procfs_badop)
|
|
#define procfs_vfree ((int (*) __P((struct vop_vfree_args *))) nullop)
|
|
#define procfs_truncate ((int (*) __P((struct vop_truncate_args *))) procfs_badop)
|
|
#define procfs_update ((int (*) __P((struct vop_update_args *))) nullop)
|
|
|
|
/*
|
|
* procfs vnode operations.
|
|
*/
|
|
vop_t **procfs_vnodeop_p;
|
|
static struct vnodeopv_entry_desc procfs_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *)vn_default_error },
|
|
{ &vop_lookup_desc, (vop_t *)procfs_lookup }, /* lookup */
|
|
{ &vop_create_desc, (vop_t *)procfs_create }, /* create */
|
|
{ &vop_mknod_desc, (vop_t *)procfs_mknod }, /* mknod */
|
|
{ &vop_open_desc, (vop_t *)procfs_open }, /* open */
|
|
{ &vop_close_desc, (vop_t *)procfs_close }, /* close */
|
|
{ &vop_access_desc, (vop_t *)procfs_access }, /* access */
|
|
{ &vop_getattr_desc, (vop_t *)procfs_getattr }, /* getattr */
|
|
{ &vop_setattr_desc, (vop_t *)procfs_setattr }, /* setattr */
|
|
{ &vop_read_desc, (vop_t *)procfs_read }, /* read */
|
|
{ &vop_write_desc, (vop_t *)procfs_write }, /* write */
|
|
{ &vop_ioctl_desc, (vop_t *)procfs_ioctl }, /* ioctl */
|
|
{ &vop_select_desc, (vop_t *)procfs_select }, /* select */
|
|
{ &vop_mmap_desc, (vop_t *)procfs_mmap }, /* mmap */
|
|
{ &vop_revoke_desc, (vop_t *)procfs_revoke }, /* revoke */
|
|
{ &vop_fsync_desc, (vop_t *)procfs_fsync }, /* fsync */
|
|
{ &vop_seek_desc, (vop_t *)procfs_seek }, /* seek */
|
|
{ &vop_remove_desc, (vop_t *)procfs_remove }, /* remove */
|
|
{ &vop_link_desc, (vop_t *)procfs_link }, /* link */
|
|
{ &vop_rename_desc, (vop_t *)procfs_rename }, /* rename */
|
|
{ &vop_mkdir_desc, (vop_t *)procfs_mkdir }, /* mkdir */
|
|
{ &vop_rmdir_desc, (vop_t *)procfs_rmdir }, /* rmdir */
|
|
{ &vop_symlink_desc, (vop_t *)procfs_symlink }, /* symlink */
|
|
{ &vop_readdir_desc, (vop_t *)procfs_readdir }, /* readdir */
|
|
{ &vop_readlink_desc, (vop_t *)procfs_readlink }, /* readlink */
|
|
{ &vop_abortop_desc, (vop_t *)procfs_abortop }, /* abortop */
|
|
{ &vop_inactive_desc, (vop_t *)procfs_inactive }, /* inactive */
|
|
{ &vop_reclaim_desc, (vop_t *)procfs_reclaim }, /* reclaim */
|
|
{ &vop_lock_desc, (vop_t *)procfs_lock }, /* lock */
|
|
{ &vop_unlock_desc, (vop_t *)procfs_unlock }, /* unlock */
|
|
{ &vop_bmap_desc, (vop_t *)procfs_bmap }, /* bmap */
|
|
{ &vop_strategy_desc, (vop_t *)procfs_strategy }, /* strategy */
|
|
{ &vop_print_desc, (vop_t *)procfs_print }, /* print */
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{ &vop_islocked_desc, (vop_t *)procfs_islocked }, /* islocked */
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{ &vop_pathconf_desc, (vop_t *)procfs_pathconf }, /* pathconf */
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{ &vop_advlock_desc, (vop_t *)procfs_advlock }, /* advlock */
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{ &vop_blkatoff_desc, (vop_t *)procfs_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, (vop_t *)procfs_valloc }, /* valloc */
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{ &vop_vfree_desc, (vop_t *)procfs_vfree }, /* vfree */
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{ &vop_truncate_desc, (vop_t *)procfs_truncate }, /* truncate */
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{ &vop_update_desc, (vop_t *)procfs_update }, /* update */
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{ NULL, NULL }
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};
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static struct vnodeopv_desc procfs_vnodeop_opv_desc =
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{ &procfs_vnodeop_p, procfs_vnodeop_entries };
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VNODEOP_SET(procfs_vnodeop_opv_desc);
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