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procfs_map.c revision 1.10 
      1 /*	$NetBSD: procfs_map.c,v 1.10 2001/01/17 00:09:08 fvdl 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/proc.h>
     47 #include <sys/vnode.h>
     48 #include <miscfs/procfs/procfs.h>
     49 
     50 #include <sys/lock.h>
     51 
     52 #include <uvm/uvm.h>
     53 
     54 #define MEBUFFERSIZE 256
     55 
     56 /*
     57  * The map entries can *almost* be read with programs like cat.  However,
     58  * large maps need special programs to read.  It is not easy to implement
     59  * a program that can sense the required size of the buffer, and then
     60  * subsequently do a read with the appropriate size.  This operation cannot
     61  * be atomic.  The best that we can do is to allow the program to do a read
     62  * with an arbitrarily large buffer, and return as much as we can.  We can
     63  * return an error code if the buffer is too small (EFBIG), then the program
     64  * can try a bigger buffer.
     65  */
     66 int
     67 procfs_domap(curp, p, pfs, uio)
     68 	struct proc *curp;
     69 	struct proc *p;
     70 	struct pfsnode *pfs;
     71 	struct uio *uio;
     72 {
     73 	int len;
     74 	int error;
     75 	vm_map_t map = &p->p_vmspace->vm_map;
     76 	vm_map_entry_t entry;
     77 	char mebuffer[MEBUFFERSIZE];
     78 
     79 	if (uio->uio_rw != UIO_READ)
     80 		return (EOPNOTSUPP);
     81 
     82 	if (uio->uio_offset != 0)
     83 		return (0);
     84 
     85 	error = 0;
     86 	if (map != &curproc->p_vmspace->vm_map)
     87 		vm_map_lock_read(map);
     88 	for (entry = map->header.next;
     89 		((uio->uio_resid > 0) && (entry != &map->header));
     90 		entry = entry->next) {
     91 
     92 		if (UVM_ET_ISSUBMAP(entry))
     93 			continue;
     94 
     95 		snprintf(mebuffer, sizeof(mebuffer),
     96 		    "0x%lx 0x%lx %c%c%c %c%c%c %s %s %d %d %d\n",
     97 		    entry->start, entry->end,
     98 		    (entry->protection & VM_PROT_READ) ? 'r' : '-',
     99 		    (entry->protection & VM_PROT_WRITE) ? 'w' : '-',
    100 		    (entry->protection & VM_PROT_EXECUTE) ? 'x' : '-',
    101 		    (entry->max_protection & VM_PROT_READ) ? 'r' : '-',
    102 		    (entry->max_protection & VM_PROT_WRITE) ? 'w' : '-',
    103 		    (entry->max_protection & VM_PROT_EXECUTE) ? 'x' : '-',
    104 		    (entry->etype & UVM_ET_COPYONWRITE) ? "COW" : "NCOW",
    105 		    (entry->etype & UVM_ET_NEEDSCOPY) ? "NC" : "NNC",
    106 		    entry->inheritance, entry->wired_count, entry->advice);
    107 
    108 		len = strlen(mebuffer);
    109 		if (len > uio->uio_resid) {
    110 			error = EFBIG;
    111 			break;
    112 		}
    113 		error = uiomove(mebuffer, len, uio);
    114 		if (error)
    115 			break;
    116 	}
    117 	if (map != &curproc->p_vmspace->vm_map)
    118 		vm_map_unlock_read(map);
    119 	return error;
    120 }
    121 
    122 int
    123 procfs_validmap(p, mp)
    124 	struct proc *p;
    125 	struct mount *mp;
    126 {
    127 	return ((p->p_flag & P_SYSTEM) == 0);
    128 }
    129