1 .\" Copyright (c) 1990, 1991 The Regents of the University of California.
2 .\" All rights reserved.
4 .\" This code is derived from software contributed to Berkeley by
5 .\" Chris Torek and the American National Standards Committee X3,
6 .\" on Information Processing Systems.
8 .\" %%%LICENSE_START(BSD_4_CLAUSE_UCB)
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38 .\" @(#)fread.3 6.6 (Berkeley) 6/29/91
40 .\" Converted for Linux, Mon Nov 29 15:37:33 1993, faith@cs.unc.edu
41 .\" Sun Feb 19 21:26:54 1995 by faith, return values
42 .\" Modified Thu Apr 20 20:43:53 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
43 .\" Modified Fri May 17 10:21:51 1996 by Martin Schulze <joey@infodrom.north.de>
45 .TH FREAD 3 2015-07-23 "GNU" "Linux Programmer's Manual"
47 fread, fwrite \- binary stream input/output
52 .BI "size_t fread(void *" ptr ", size_t " size ", size_t " nmemb \
55 .BI "size_t fwrite(const void *" ptr ", size_t " size ", size_t " nmemb ,
56 .BI " FILE *" stream );
65 bytes long, from the stream pointed to by
67 storing them at the location given by
76 bytes long, to the stream pointed to by
78 obtaining them from the location given by
81 For nonlocking counterparts, see
82 .BR unlocked_stdio (3).
88 return the number of items read or written.
89 This number equals the number of bytes transferred only when
92 If an error occurs, or the end of the file is reached,
93 the return value is a short item count (or zero).
96 does not distinguish between end-of-file and error, and callers must use
100 to determine which occurred.
102 For an explanation of the terms used in this section, see
108 Interface Attribute Value
112 T} Thread safety MT-Safe
115 POSIX.1-2001, POSIX.1-2008, C89.
121 .BR unlocked_stdio (3)