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procfs_map.c revision 1.10.2.1 
      1 /*	$NetBSD: procfs_map.c,v 1.10.2.1 2001/03/05 22:49:51 nathanw Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993 Jan-Simon Pendry
      5  * Copyright (c) 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * Jan-Simon Pendry.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	@(#)procfs_status.c	8.3 (Berkeley) 2/17/94
     40  *
     41  *	$FreeBSD: procfs_map.c,v 1.18 1998/12/04 22:54:51 archie Exp $
     42  */
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/lwp.h>
     47 #include <sys/proc.h>
     48 #include <sys/vnode.h>
     49 #include <miscfs/procfs/procfs.h>
     50 
     51 #include <sys/lock.h>
     52 
     53 #include <uvm/uvm.h>
     54 
     55 #define MEBUFFERSIZE 256
     56 
     57 /*
     58  * The map entries can *almost* be read with programs like cat.  However,
     59  * large maps need special programs to read.  It is not easy to implement
     60  * a program that can sense the required size of the buffer, and then
     61  * subsequently do a read with the appropriate size.  This operation cannot
     62  * be atomic.  The best that we can do is to allow the program to do a read
     63  * with an arbitrarily large buffer, and return as much as we can.  We can
     64  * return an error code if the buffer is too small (EFBIG), then the program
     65  * can try a bigger buffer.
     66  */
     67 int
     68 procfs_domap(curp, p, pfs, uio)
     69 	struct proc *curp;
     70 	struct proc *p;
     71 	struct pfsnode *pfs;
     72 	struct uio *uio;
     73 {
     74 	int len;
     75 	int error;
     76 	vm_map_t map = &p->p_vmspace->vm_map;
     77 	vm_map_entry_t entry;
     78 	char mebuffer[MEBUFFERSIZE];
     79 
     80 	if (uio->uio_rw != UIO_READ)
     81 		return (EOPNOTSUPP);
     82 
     83 	if (uio->uio_offset != 0)
     84 		return (0);
     85 
     86 	error = 0;
     87 	if (map != &curproc->l_proc->p_vmspace->vm_map)
     88 		vm_map_lock_read(map);
     89 	for (entry = map->header.next;
     90 		((uio->uio_resid > 0) && (entry != &map->header));
     91 		entry = entry->next) {
     92 
     93 		if (UVM_ET_ISSUBMAP(entry))
     94 			continue;
     95 
     96 		snprintf(mebuffer, sizeof(mebuffer),
     97 		    "0x%lx 0x%lx %c%c%c %c%c%c %s %s %d %d %d\n",
     98 		    entry->start, entry->end,
     99 		    (entry->protection & VM_PROT_READ) ? 'r' : '-',
    100 		    (entry->protection & VM_PROT_WRITE) ? 'w' : '-',
    101 		    (entry->protection & VM_PROT_EXECUTE) ? 'x' : '-',
    102 		    (entry->max_protection & VM_PROT_READ) ? 'r' : '-',
    103 		    (entry->max_protection & VM_PROT_WRITE) ? 'w' : '-',
    104 		    (entry->max_protection & VM_PROT_EXECUTE) ? 'x' : '-',
    105 		    (entry->etype & UVM_ET_COPYONWRITE) ? "COW" : "NCOW",
    106 		    (entry->etype & UVM_ET_NEEDSCOPY) ? "NC" : "NNC",
    107 		    entry->inheritance, entry->wired_count, entry->advice);
    108 
    109 		len = strlen(mebuffer);
    110 		if (len > uio->uio_resid) {
    111 			error = EFBIG;
    112 			break;
    113 		}
    114 		error = uiomove(mebuffer, len, uio);
    115 		if (error)
    116 			break;
    117 	}
    118 	if (map != &curproc->l_proc->p_vmspace->vm_map)
    119 		vm_map_unlock_read(map);
    120 	return error;
    121 }
    122 
    123 int
    124 procfs_validmap(l, mp)
    125 	struct lwp *l;
    126 	struct mount *mp;
    127 {
    128 	return ((l->l_proc->p_flag & P_SYSTEM) == 0);
    129 }
    130