1 /*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 /*
19 FUNCTION
20 <<ferror>>, <<ferror_unlocked>>---test whether read/write error has occurred
21
22 INDEX
23 ferror
24 INDEX
25 ferror_unlocked
26
27 SYNOPSIS
28 #include <stdio.h>
29 int ferror(FILE *<[fp]>);
30
31 #define _BSD_SOURCE
32 #include <stdio.h>
33 int ferror_unlocked(FILE *<[fp]>);
34
35 DESCRIPTION
36 The <<stdio>> functions maintain an error indicator with each file
37 pointer <[fp]>, to record whether any read or write errors have
38 occurred on the associated file or stream.
39 Use <<ferror>> to query this indicator.
40
41 See <<clearerr>> to reset the error indicator.
42
43 <<ferror_unlocked>> is a non-thread-safe version of <<ferror>>.
44 <<ferror_unlocked>> may only safely be used within a scope
45 protected by flockfile() (or ftrylockfile()) and funlockfile(). This
46 function may safely be used in a multi-threaded program if and only
47 if they are called while the invoking thread owns the (FILE *)
48 object, as is the case after a successful call to the flockfile() or
49 ftrylockfile() functions. If threads are disabled, then
50 <<ferror_unlocked>> is equivalent to <<ferror>>.
51
52 RETURNS
53 <<ferror>> returns <<0>> if no errors have occurred; it returns a
54 nonzero value otherwise.
55
56 PORTABILITY
57 ANSI C requires <<ferror>>.
58
59 <<ferror_unlocked>> is a BSD extension also provided by GNU libc.
60
61 No supporting OS subroutines are required.
62 */
63
64 #if defined(LIBC_SCCS) && !defined(lint)
65 static char sccsid[] = "%W% (Berkeley) %G%";
66 #endif /* LIBC_SCCS and not lint */
67
68 #define _DEFAULT_SOURCE
69 #include <_ansi.h>
70 #include <stdio.h>
71 #include "local.h"
72
73 /* A subroutine version of the macro ferror. */
74
75 #undef ferror
76
77 int
ferror(FILE * fp)78 ferror (FILE * fp)
79 {
80 int result;
81 CHECK_INIT(_REENT, fp);
82 _newlib_flockfile_start (fp);
83 result = __sferror (fp);
84 _newlib_flockfile_end (fp);
85 return result;
86 }
87
