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/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2021 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include <ntapi/nt_sysinfo.h>
#include <ntapi/nt_memory.h>
#include <ntapi/ntapi.h>
#include "ntapi_impl.h"
int32_t __stdcall __ntapi_tt_get_system_info_snapshot(
__in_out nt_system_information_snapshot * sys_info_snapshot)
{
int32_t status;
/* pre-allocated buffer? */
if (sys_info_snapshot->buffer)
status = __ntapi->zw_query_system_information(
sys_info_snapshot->sys_info_class,
sys_info_snapshot->buffer,
sys_info_snapshot->max_len,
&sys_info_snapshot->info_len);
else {
/* set initial buffer size */
sys_info_snapshot->max_len = NT_ALLOCATION_GRANULARITY;
/* allocate initial buffer */
status = __ntapi->zw_allocate_virtual_memory(
NT_CURRENT_PROCESS_HANDLE,
(void **)&sys_info_snapshot->buffer,
0,
&sys_info_snapshot->max_len,
NT_MEM_COMMIT,
NT_PAGE_READWRITE);
/* verification */
if (status != NT_STATUS_SUCCESS)
return status;
/* loop until buffer is large enough to satisfy the system */
while ((status = __ntapi->zw_query_system_information(
sys_info_snapshot->sys_info_class,
sys_info_snapshot->buffer,
sys_info_snapshot->max_len,
&sys_info_snapshot->info_len))
== NT_STATUS_INFO_LENGTH_MISMATCH) {
/* free previously allocated memory */
status = __ntapi->zw_free_virtual_memory(
NT_CURRENT_PROCESS_HANDLE,
(void **)&sys_info_snapshot->buffer,
&sys_info_snapshot->max_len,
NT_MEM_RELEASE);
/* verification */
if (status != NT_STATUS_SUCCESS)
return status;
/* reset buffer and increase buffer size */
sys_info_snapshot->buffer = (nt_system_information_buffer *)0;
sys_info_snapshot->max_len += NT_ALLOCATION_GRANULARITY;
/* reallocate buffer memory */
status = __ntapi->zw_allocate_virtual_memory(
NT_CURRENT_PROCESS_HANDLE,
(void **)&sys_info_snapshot->buffer,
0,
&sys_info_snapshot->max_len,
NT_MEM_COMMIT,
NT_PAGE_READWRITE);
/* verification */
if (status != NT_STATUS_SUCCESS)
return status;
}
}
/* verification */
if (status == NT_STATUS_SUCCESS) {
sys_info_snapshot->pcurrent = &sys_info_snapshot->buffer->mark;
return NT_STATUS_SUCCESS;
} else {
sys_info_snapshot->pcurrent = (void *)0;
return status;
}
}
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