Atomic Read and Write with stdio

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fwrite

FREAD(3)						     Linux Programmer's Manual							  FREAD(3)

NAME

       fread, fwrite - binary stream input/output

SYNOPSIS

       #include <stdio.h>

       size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);

       size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);

DESCRIPTION

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

       The function fwrite writes nmemb elements of data, each size bytes long, to the stream pointed to by stream, obtaining them from the  loca-
       tion given by ptr.

       For non-locking counterparts, see unlocked_stdio(3).

RETURN VALUE

       fread  and fwrite return the number of items successfully read or written (i.e., not the number of characters).	If an error occurs, or the
       end-of-file is reached, the return value is a short item count (or zero).

       fread does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred.

CONFORMING TO

       The functions fread and fwrite conform to ANSI X3.159-1989 (``ANSI C'').

SEE ALSO

       read(2), write(2), feof(3), ferror(3), unlocked_stdio(3)

BSD MANPAGE
							    1996-05-17								  FREAD(3)

Programming