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/********************************************************/
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/* ntapi: Native API core library */
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/* Copyright (C) 2013--2016 Z. Gilboa */
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/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
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/********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <pemagine/pemagine.h>
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#include <ntapi/nt_sysinfo.h>
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#include <ntapi/nt_memory.h>
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#include <ntapi/ntapi.h>
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#include "ntapi_impl.h"
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int32_t __stdcall __ntapi_tt_get_system_info_snapshot(
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__in_out nt_system_information_snapshot * sys_info_snapshot)
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{
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int32_t status;
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/* pre-allocated buffer? */
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if (sys_info_snapshot->buffer)
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status = __ntapi->zw_query_system_information(
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sys_info_snapshot->sys_info_class,
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sys_info_snapshot->buffer,
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sys_info_snapshot->max_len,
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&sys_info_snapshot->info_len);
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else {
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/* set initial buffer size */
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sys_info_snapshot->max_len = NT_ALLOCATION_GRANULARITY;
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/* allocate initial buffer */
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status = __ntapi->zw_allocate_virtual_memory(
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NT_CURRENT_PROCESS_HANDLE,
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(void **)&sys_info_snapshot->buffer,
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0,
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&sys_info_snapshot->max_len,
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NT_MEM_COMMIT,
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NT_PAGE_READWRITE);
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/* verification */
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if (status != NT_STATUS_SUCCESS)
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return status;
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/* loop until buffer is large enough to satisfy the system */
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while ((status = __ntapi->zw_query_system_information(
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sys_info_snapshot->sys_info_class,
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sys_info_snapshot->buffer,
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sys_info_snapshot->max_len,
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&sys_info_snapshot->info_len))
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== NT_STATUS_INFO_LENGTH_MISMATCH) {
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/* free previously allocated memory */
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status = __ntapi->zw_free_virtual_memory(
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NT_CURRENT_PROCESS_HANDLE,
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(void **)&sys_info_snapshot->buffer,
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&sys_info_snapshot->max_len,
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NT_MEM_RELEASE);
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/* verification */
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if (status != NT_STATUS_SUCCESS)
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return status;
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/* reset buffer and increase buffer size */
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sys_info_snapshot->buffer = (nt_system_information_buffer *)0;
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sys_info_snapshot->max_len += NT_ALLOCATION_GRANULARITY;
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/* reallocate buffer memory */
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status = __ntapi->zw_allocate_virtual_memory(
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NT_CURRENT_PROCESS_HANDLE,
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(void **)&sys_info_snapshot->buffer,
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0,
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&sys_info_snapshot->max_len,
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NT_MEM_COMMIT,
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NT_PAGE_READWRITE);
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/* verification */
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if (status != NT_STATUS_SUCCESS)
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return status;
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}
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}
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/* verification */
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if (status == NT_STATUS_SUCCESS) {
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sys_info_snapshot->pcurrent = &sys_info_snapshot->buffer->mark;
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return NT_STATUS_SUCCESS;
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} else {
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sys_info_snapshot->pcurrent = (void *)0;
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return status;
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}
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}
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