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FreeBSD/Linux Kernel Cross Reference
sys/stdio/fwalk.c

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    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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #if defined(LIBC_SCCS) && !defined(lint)
   34 static char sccsid[] = "@(#)fwalk.c     8.1 (Berkeley) 6/4/93";
   35 #endif /* LIBC_SCCS and not lint */
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: head/lib/libc/stdio/fwalk.c 165903 2007-01-09 00:28:16Z imp $");
   38 
   39 #include <sys/types.h>
   40 #include <machine/atomic.h>
   41 #include <stdio.h>
   42 #include "local.h"
   43 #include "glue.h"
   44 
   45 int
   46 _fwalk(function)
   47         int (*function)(FILE *);
   48 {
   49         FILE *fp;
   50         int n, ret;
   51         struct glue *g;
   52 
   53         ret = 0;
   54         /*
   55          * It should be safe to walk the list without locking it;
   56          * new nodes are only added to the end and none are ever
   57          * removed.
   58          *
   59          * Avoid locking this list while walking it or else you will
   60          * introduce a potential deadlock in [at least] refill.c.
   61          */
   62         for (g = &__sglue; g != NULL; g = g->next)
   63                 for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
   64                         if ((fp->_flags != 0) && ((fp->_flags & __SIGN) == 0))
   65                                 ret |= (*function)(fp);
   66         return (ret);
   67 }

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