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, is_acceptable(current_severity, min_severity)8 * advertising materials, and 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>>---test whether read/write error has occurred 21 22 INDEX 23 ferror 24 25 ANSI_SYNOPSIS 26 #include <stdio.h> 27 int ferror(FILE *<[fp]>); 28 29 TRAD_SYNOPSIS 30 #include <stdio.h> 31 int ferror(<[fp]>) 32 FILE *<[fp]>; 33 34 DESCRIPTION 35 The <<stdio>> functions maintain an error indicator with each file 36 pointer <[fp]>, to record whether any read or write errors have 37 occurred on the associated file or stream. 38 Use <<ferror>> to query this indicator. 39 40 See <<clearerr>> to reset the error indicator. 41 42 RETURNS 43 <<ferror>> returns <<0>> if no errors have occurred; it returns a 44 nonzero value otherwise. 45 46 PORTABILITY 47 ANSI C requires <<ferror>>. 48 49 No supporting OS subroutines are required. 50 */ 51 52 #if defined(LIBC_SCCS) && !defined(lint) 53 static char sccsid[] = "%W% (Berkeley) %G%"; 54 #endif /* LIBC_SCCS and not lint */ 55 56 #include <stdio.h> 57 58 /* A subroutine version of the macro ferror. */ 59 60 #undef ferror 61 62 int 63 _DEFUN (ferror, (fp), 64 FILE * fp) 65 { 66 int result; 67 _flockfile(fp); 68 result = __sferror (fp); 69 _funlockfile(fp); 70 return result; 71 } 72