readfsbyte-readfsdword-readfsqword-readfsword.md

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Learn more about: __readfsbyte, __readfsdword, __readfsqword, __readfsword	__readfsbyte, __readfsdword, __readfsqword, __readfsword	09/02/2019	__readfsword __readfsdword __readfsbyte __readfsqword	__readfsword intrinsic readfsword intrinsic __readfsdword intrinsic readfsbyte intrinsic __readfsbyte intrinsic readfsdword intrinsic readfsqword intrinsic __readfsqword intrinsic	f6ee7203-4179-402c-a464-0746c84ce6ac

__readfsbyte, __readfsdword, __readfsqword, __readfsword

Microsoft Specific

Read memory from a location specified by an offset relative to the beginning of the FS segment.

Syntax

unsigned char __readfsbyte(
   unsigned long Offset
);
unsigned short __readfsword(
   unsigned long Offset
);
unsigned long __readfsdword(
   unsigned long Offset
);
unsigned __int64 __readfsqword(
   unsigned long Offset
);

Parameters

Offset
[in] The offset from the beginning of FS to read from.

Return value

The memory contents of the byte, word, doubleword, or quadword (as indicated by the name of the function called) at the location FS:[Offset].

Requirements

Intrinsic	Architecture
__readfsbyte	x86
__readfsdword	x86
__readfsqword	x86
__readfsword	x86

Header file <intrin.h>

Remarks

These routines are available only as intrinsics.

END Microsoft Specific

See also

__writefsbyte, __writefsdword, __writefsqword, __writefsword
Compiler intrinsics