In Linux, the easiest way to look at a process' memory map is looking at /proc/PID/maps
, giving something like this:
08048000-08056000 r-xp 00000000 03:0c 64593 /usr/sbin/gpm 08056000-08058000 rw-p 0000d000 03:0c 64593 /usr/sbin/gpm 08058000-0805b000 rwxp 00000000 00:00 0 40000000-40013000 r-xp 00000000 03:0c 4165 /lib/ld-2.2.4.so 40013000-40015000 rw-p 00012000 03:0c 4165 /lib/ld-2.2.4.so 4001f000-40135000 r-xp 00000000 03:0c 45494 /lib/libc-2.2.4.so 40135000-4013e000 rw-p 00115000 03:0c 45494 /lib/libc-2.2.4.so 4013e000-40142000 rw-p 00000000 00:00 0 bffff000-c0000000 rwxp 00000000 00:00 0
How can a process get the equivalent information (address ranges, protection, mapped filename, etc...) about a process' own memory map under OSX 10.5 or 10.6?
There is a MacFUSE implementation of procfs . With it, you can get the memory map as follows:
cat /proc/PID/task/vmmap
Looking at the source code , it looks like it's using the Mach virtual memory interface to get the memory map from the kernel.
Here's the implementation for the vmmap
pseudofile:
/*
* procfs as a MacFUSE file system for Mac OS X
*
* Copyright Amit Singh. All Rights Reserved.
* http://osxbook.com
*
* http://code.google.com/p/macfuse/
*
* Source License: GNU GENERAL PUBLIC LICENSE (GPL)
*/
READ_HANDLER(proc__task__vmmap)
{
int len = -1;
kern_return_t kr;
#define MAX_VMMAP_SIZE 65536 /* XXX */
char tmpbuf[MAX_VMMAP_SIZE];
task_t the_task;
pid_t pid = strtol(argv[0], NULL, 10);
kr = task_for_pid(mach_task_self(), pid, &the_task);
if (kr != KERN_SUCCESS) {
return -EIO;
}
vm_size_t vmsize;
vm_address_t address;
vm_region_basic_info_data_t info;
mach_msg_type_number_t info_count;
vm_region_flavor_t flavor;
memory_object_name_t object;
kr = KERN_SUCCESS;
address = 0;
len = 0;
do {
flavor = VM_REGION_BASIC_INFO;
info_count = VM_REGION_BASIC_INFO_COUNT;
kr = vm_region(the_task, &address, &vmsize, flavor,
(vm_region_info_t)&info, &info_count, &object);
if (kr == KERN_SUCCESS) {
if (len >= MAX_VMMAP_SIZE) {
goto gotdata;
}
len += snprintf(tmpbuf + len, MAX_VMMAP_SIZE - len,
"%08x-%08x %8uK %c%c%c/%c%c%c %11s %6s %10s uwir=%hu sub=%u\n",
address, (address + vmsize), (vmsize >> 10),
(info.protection & VM_PROT_READ) ? 'r' : '-',
(info.protection & VM_PROT_WRITE) ? 'w' : '-',
(info.protection & VM_PROT_EXECUTE) ? 'x' : '-',
(info.max_protection & VM_PROT_READ) ? 'r' : '-',
(info.max_protection & VM_PROT_WRITE) ? 'w' : '-',
(info.max_protection & VM_PROT_EXECUTE) ? 'x' : '-',
inheritance_strings[info.inheritance],
(info.shared) ? "shared" : "-",
behavior_strings[info.behavior],
info.user_wired_count,
info.reserved);
address += vmsize;
} else if (kr != KERN_INVALID_ADDRESS) {
if (the_task != MACH_PORT_NULL) {
mach_port_deallocate(mach_task_self(), the_task);
}
return -EIO;
}
} while (kr != KERN_INVALID_ADDRESS);
gotdata:
if (the_task != MACH_PORT_NULL) {
mach_port_deallocate(mach_task_self(), the_task);
}
READ_PROC_TASK_EPILOGUE();
}
Take a look at this thread from 2007 on the Darwin-kernel mailing list. In a nutshell, your choices are to popen vmmap
(which is setgid
appropriately) or use the Mach VM region APIs in /usr/include/mach/mach_vm.h
. I found a decent example of using the Mach API in the Sage Mathematics System sources .
A couple more links for those looking for vmmap source (it's not published ):
Getting the the mapped file name and the names of libraries from dyld_shared_cache: https://stackoverflow.com/a/17180619/1026
GNUlib( http://www.gnu.org/software/gnulib/ )包含一个函数,用于迭代大多数操作系统中的所有虚拟内存段,包括MAC OS X.它位于vma-iter.c中
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