/* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* FUNCTION <<ferror>>, <<ferror_unlocked>>---test whether read/write error has occurred INDEX ferror INDEX ferror_unlocked ANSI_SYNOPSIS #include <stdio.h> int ferror(FILE *<[fp]>); #define _BSD_SOURCE #include <stdio.h> int ferror_unlocked(FILE *<[fp]>); TRAD_SYNOPSIS #include <stdio.h> int ferror(<[fp]>) FILE *<[fp]>; #define _BSD_SOURCE #include <stdio.h> int ferror_unlocked(<[fp]>) FILE *<[fp]>; DESCRIPTION The <<stdio>> functions maintain an error indicator with each file pointer <[fp]>, to record whether any read or write errors have occurred on the associated file or stream. Use <<ferror>> to query this indicator. See <<clearerr>> to reset the error indicator. <<ferror_unlocked>> is a non-thread-safe version of <<ferror>>. <<ferror_unlocked>> may only safely be used within a scope protected by flockfile() (or ftrylockfile()) and funlockfile(). This function may safely be used in a multi-threaded program if and only if they are called while the invoking thread owns the (FILE *) object, as is the case after a successful call to the flockfile() or ftrylockfile() functions. If threads are disabled, then <<ferror_unlocked>> is equivalent to <<ferror>>. RETURNS <<ferror>> returns <<0>> if no errors have occurred; it returns a nonzero value otherwise. PORTABILITY ANSI C requires <<ferror>>. <<ferror_unlocked>> is a BSD extension also provided by GNU libc. No supporting OS subroutines are required. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "%W% (Berkeley) %G%"; #endif /* LIBC_SCCS and not lint */ #include <_ansi.h> #include <stdio.h> #include "local.h" /* A subroutine version of the macro ferror. */ #undef ferror int _DEFUN(ferror, (fp), FILE * fp) { int result; CHECK_INIT(_REENT, fp); _newlib_flockfile_start (fp); result = __sferror (fp); _newlib_flockfile_end (fp); return result; }