man vmmap
vmmap has been around since at least 10.2.
Here's an example of the output:
% vmmap -pages screen
Virtual Memory Map of process 5755 (screen)
Output report format: 2.2 -- 32-bit process
==== Non-writable regions for process 5755
__PAGEZERO 00000000-00001000 [ 1] ---/--- SM=NUL .../bin/screen
__TEXT 00001000-00046000 [ 69] r-x/rwx SM=COW .../bin/screen
__LINKEDIT 0004e000-00051000 [ 3] r--/rwx SM=COW .../bin/screen
STACK GUARD 00051000-00052000 [ 1] ---/rwx SM=NUL
STACK GUARD 00053000-00054000 [ 1] ---/rwx SM=NUL
STACK GUARD 00068000-00069000 [ 1] ---/rwx SM=NUL
STACK GUARD 0006a000-0006b000 [ 1] ---/rwx SM=NUL
__TEXT 8fe00000-8fe31000 [ 49] r-x/rwx SM=COW /usr/lib/dyld
__LINKEDIT 8fe68000-8fe76000 [ 14] r--/rwx SM=COW /usr/lib/dyld
__TEXT 91a5c000-91bf6000 [ 410] r-x/r-x SM=COW ...tem.B.dylib
__TEXT 93735000-93767000 [ 50] r-x/r-x SM=COW ...s.5.4.dylib
__TEXT 93ff4000-94000000 [ 12] r-x/r-x SM=COW ...c_s.1.dylib
__TEXT 9611c000-96122000 [ 6] r-x/r-x SM=COW ...mon.A.dylib
__LINKEDIT 96e6e000-972da000 [ 1132] r--/r-- SM=COW ...mon.A.dylib
STACK GUARD bc000000-bf800000 [ 14336] ---/rwx SM=NUL
STACK GUARD fffec000-ffff0000 [ 4] ---/rwx SM=NUL
shared memory ffff8000-ffffa000 [ 2] r-x/r-x SM=SHM
==== Writable regions for process 5755
__DATA 00046000-0004e000 [ 8] rw-/rwx SM=COW .../bin/screen
MALLOC (freed?) 00052000-00053000 [ 1] rw-/rwx SM=PRV
MALLOC_LARGE 00054000-00068000 [ 20] rw-/rwx SM=COW ...ne_0x100000
MALLOC (freed?) 00069000-0006a000 [ 1] rw-/rwx SM=COW
MALLOC_TINY 00100000-00200000 [ 256] rw-/rwx SM=PRV ...ne_0x100000
MALLOC_TINY 00200000-00300000 [ 256] rw-/rwx SM=COW zone_0x0
MALLOC_SMALL 00800000-01000000 [ 2048] rw-/rwx SM=PRV ...ne_0x100000
__DATA 8fe31000-8fe68000 [ 55] rw-/rwx SM=COW /usr/lib/dyld
__DATA a0336000-a0377000 [ 65] rw-/rwx SM=COW ...tem.B.dylib
__DATA a0767000-a0770000 [ 9] rw-/rwx SM=COW ...s.5.4.dylib
__DATA a0890000-a0891000 [ 1] rw-/rwx SM=COW ...c_s.1.dylib
__DATA a0c02000-a0c03000 [ 1] rw-/rwx SM=COW ...mon.A.dylib
Stack bf800000-c0000000 [ 2048] rw-/rwx SM=COW thread 0
==== Legend
SM=sharing mode:
COW=copy_on_write PRV=private NUL=empty ALI=aliased
SHM=shared ZER=zero_filled S/A=shared_alias
==== Summary for process 5755
ReadOnly portion of Libraries: Total=6980K resident=6700K(96%) swapped_out_or_unallocated=280K(4%)
Writable regions: Total=18.3M written=224K(1%) resident=356K(2%) swapped_out=0K(0%) unallocated=18.0M(98%)
REGION TYPE [ VIRTUAL]
=========== [ =======]
MALLOC [ 2582]
STACK GUARD [ 14344]
Stack [ 2048]
__DATA [ 139]
__LINKEDIT [ 1149]
__PAGEZERO [ 1]
__TEXT [ 596]
shared memory [ 2]
--Steve
On Mon, Feb 18, 2008 at 01:43:00PM +0200, Vincent Coetzee wrote:
> Dear List,
>
> I am hoping someone on these lists can assist me with my little
> problem. If the problem is not appropriate to these lists, could
> someone please point me in the right direction. I have a requirement
> to know which memory pages (allocated by my application) have been
> written to during the execution of my application, I also need to know
> the addresses of the areas of the pages that have been changed. I have
> spent hours perusing the BSD and Darwin documents without finding
> anything that seems to allow for this. Does anyone know how to do this
> or can suggest something please, I am at my wits end.
>
> Thanks in advance
>
> Vince
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