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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 location 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
       C89, POSIX.1-2001.

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

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



GNU                               1996-05-17                          FREAD(3)

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