lib/libc/stdio/fwalk.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)fwalk.c  8.1 (Berkeley) 6/4/93
  37  * $FreeBSD: src/lib/libc/stdio/fwalk.c,v 1.6.2.1 2001/03/05 11:27:49 obrien Exp $
  38  * $DragonFly: src/lib/libc/stdio/fwalk.c,v 1.5 2005/07/23 20:23:06 joerg Exp $
  39  */
  40
  41 #include <stdio.h>
  42 #include <sys/types.h>
  43 #include <machine/atomic.h>
  44 #include "local.h"
  45 #include "priv_stdio.h"
  46
  47 int
  48 _fwalk(int (*function)(FILE *))
  49 {
  50         FILE *fp;
  51         int n, ret;
  52         struct glue *g;
  53
  54         ret = 0;
  55         /*
  56          * It should be safe to walk  the list without locking it;
  57          * new nodes are only added to the end and none are ever
  58          * removed.
  59          */
  60         for (g = &__sglue; g != NULL; g = g->next)
  61                 for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
  62                         if (fp->pub._flags != 0)
  63                                 ret |= (*function)(fp);
  64         return (ret);
  65 }