.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
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.\"     @(#)fread.3	6.6 (Berkeley) 6/29/91
.\"
.\" Converted for Linux, Mon Nov 29 15:37:33 1993, faith@cs.unc.edu
.\" Sun Feb 19 21:26:54 1995 by faith, return values
.\" Modified Thu Apr 20 20:43:53 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
.\" Modified Fri May 17 10:21:51 1996 by Martin Schulze <joey@infodrom.north.de>
.\" Translated into Spanish Jan 20 1998 by Gerardo Aburruzaga García
.\" <gerardo.aburruzaga@uca.es>
.\"
.TH FREAD 3  "17 mayo 1996" "BSD" "Manual del Programador de Linux"
.SH NOMBRE
fread, fwrite \- entrada/salida binaria de flujos de datos
.SH SINOPSIS
.B #include <stdio.h>
.sp
.BI "size_t fread( void *" ptr ", size_t " tam ", size_t " nmiemb ,
.BI "FILE *" flujo );
.sp
.BI "size_t fwrite( const void *" ptr ", size_t " tam ", size_t " nmiemb ,
.BI "FILE *" flujo );
.SH DESCRIPCIÓN
La función
.B fread
lee
.I nmiemb
elementos de datos, cada uno de
.I tam
bytes de largo, del flujo de datos apuntado por
.IR flujo ,
almacenándolos en el sitio apuntado por
.IR ptr .
.PP
La función
.B fwrite
escribe
.I nmiemb
elementos de datos, cada uno de
.I tam
bytes de largo, al flujo de datos apuntado por
.IR flujo ,
obteniéndolos del sitio apuntado por
.IR ptr .
.PP
Para las versiones no-bloqueantes, véase
.BR unlocked_stdio (3).
.SH "VALOR DEVUELTO"
.B fread
y
.B fwrite
devuelven el número de elementos (no de caracteres) leídos o escritos
correctamente. Si ocurre un error o se llega al fin-de-fichero, el
valor devuelto es un número menor del esperado (o cero).
.PP
.B fread
no distingue entre fin-de-fichero y error, así que quien llame a esta
función debe emplear
.BR feof (3)
y
.BR ferror (3)
para determinar qué ha ocurrido.
.SH CONFORME A
Las funciones
.B fread
y
.B fwrite
son conformes con ANSI X3.159-1989 (``C ANSI'').
.SH "VÉASE TAMBIÉN"
.BR read (2),
.BR write (2),
.BR feof (3),
.BR ferror (3),
.BR unlocked_stdio (3)