toolchain/gcc/newlib/libc/stdio/ferror.c

   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  * 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 }