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