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NetBSD 6.1.5 - man page for fread (netbsd section 3)

FREAD(3)			   BSD Library Functions Manual 			 FREAD(3)

NAME
     fread, fwrite -- binary stream input/output

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <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.

     Mixing fread() and fwrite() calls without setting the file position explicitly using
     fsetpos(3) between read and write or write and read operations will lead to unexpected
     results because of buffering the file pointer not being set to the expected position after
     each operation completes.	This behavior is allowed by ANSI C for efficiency and it will not
     be changed.

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
     size or nmemb is 0, the functions return 0 and the state of stream remains unchanged.  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 ANSI X3.159-1989 (``ANSI C89'').

BSD					September 11, 2011				      BSD


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