.\" 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.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     @(#)ferror.3	6.8 (Berkeley) 6/29/91
.\"
.\"
.\" Converted for Linux, Mon Nov 29 14:24:40 1993, faith@cs.unc.edu
.\" Added remark on EBADF for fileno, aeb, 2001-03-22
.\"
.TH FERROR 3  2001-10-16 "" "Linux Programmer's Manual"
.SH NAME
clearerr, feof, ferror, fileno \- 檢測和重置流狀態
.SH "SYNOPSIS 總覽"
.B #include <stdio.h>
.sp
.BI "void clearerr(FILE *" stream );
.br
.BI "int feof(FILE *" stream );
.br
.BI "int ferror(FILE *" stream );
.br
.BI "int fileno(FILE *" stream );
.SH "DESCRIPTION 描述"
函數
.B clearerr
清除
.IR stream
指向的流中的文件結束標記和錯誤標記。
.PP
函數
.B feof
測試
tests the end-of-file indicator for the stream pointed to by
.IR stream
指向的流中的文件結束標記，如果已設置就返回非零值。文件結束標記只能用函數
.BR clearerr
清除。
.PP
函數
.B ferror
測試
.IR stream
指向的流中的錯誤標記，如果已設置就返回非零值。錯誤標記只能用函數
.B clearerr
重置。
.PP
函數
.B fileno
檢測
.I stream
參數，返回它的整數形式的文件描述符。
.PP
關於對應的非鎖定函數，請參見
.BR unlocked_stdio (3)
。
.SH "ERRORS 錯誤"
這些函數不應當失敗，它們不設置外部變量
.IR errno
。(但是，如果
.B fileno
檢測到它的參數不是有效的流，它必須返回 \-1，並且將
.I errno
設置爲
.BR EBADF
。)
.SH "CONFORMING TO 標準參考"
函數
.BR clearerr ,
.BR feof ,
以及
.BR ferror
遵循 X3.159-1989 (``ANSI C'') 標準。
.SH "SEE ALSO 參見"
.BR open (2),
.BR unlocked_stdio (3),
.BR stdio (3)
.SH "跋"
.br
本頁面中文版由中文 man 手冊頁計劃提供。
.br
中文 man 手冊頁計劃：\fBhttps://github.com/man-pages-zh/manpages-zh\fR