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Man Pages


Manual Reference Pages  -  FWRITE (3)

NAME

fread, fwrite - binary stream input/output

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In stdio.h size_t fread void * restrict ptr size_t size size_t nmemb FILE * restrict stream size_t fwrite const void * restrict ptr size_t size size_t nmemb FILE * restrict stream

DESCRIPTION

The function fread reads nmemb objects, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr.

The function fwrite writes nmemb objects, each size bytes long, to the stream pointed to by stream, obtaining them from the location given by ptr.

RETURN VALUES

The functions fread and fwrite advance the file position indicator for the stream by the number of bytes read or written. They return the number of objects read or written. If an error occurs, or the end-of-file is reached, the return value is a short object count (or zero).

The function fread does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred. The function fwrite returns a value less than nmemb only if a write error has occurred.

SEE ALSO

read(2), write(2)

STANDARDS

The functions fread and fwrite conform to -isoC.
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