Function ptrace_vm_entry

freebsd/kern/sys_process.c:337–447

}

static int
ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
{
	struct vattr vattr;
	vm_map_t map;
	vm_map_entry_t entry;
	vm_object_t obj, tobj, lobj;
	struct vmspace *vm;
	struct vnode *vp;
	char *freepath, *fullpath;
	u_int pathlen;
	int error, index;

	error = 0;
	obj = NULL;

	vm = vmspace_acquire_ref(p);
	map = &vm->vm_map;
	vm_map_lock_read(map);

	do {
		KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
		    ("Submap in map header"));
		index = 0;
		VM_MAP_ENTRY_FOREACH(entry, map) {
			if (index >= pve->pve_entry &&
			    (entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0)
				break;
			index++;
		}
		if (index < pve->pve_entry) {
			error = EINVAL;
			break;
		}
		if (entry == &map->header) {
			error = ENOENT;
			break;
		}

		/* We got an entry. */
		pve->pve_entry = index + 1;
		pve->pve_timestamp = map->timestamp;
		pve->pve_start = entry->start;
		pve->pve_end = entry->end - 1;
		pve->pve_offset = entry->offset;
		pve->pve_prot = entry->protection;

		/* Backing object's path needed? */
		if (pve->pve_pathlen == 0)
			break;

		pathlen = pve->pve_pathlen;
		pve->pve_pathlen = 0;

		obj = entry->object.vm_object;
		if (obj != NULL)
			VM_OBJECT_RLOCK(obj);
	} while (0);