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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 nonlocking counterparts, see unlocked_stdio(3).

RETURN VALUE
       On  success, fread() and fwrite() return the number of items read or written.  This number
       equals the number of bytes transferred only when size is 1.  If an error  occurs,  or  the
       end of the 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 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information    about    reporting    bugs,    can    be    found    at
       http://www.kernel.org/doc/man-pages/.



GNU                                         2012-03-30                                   FREAD(3)

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