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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  * 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 
   37 #if defined(LIBC_SCCS) && !defined(lint)
   38 static char sccsid[] = "@(#)fwalk.c     8.1 (Berkeley) 6/4/93";
   39 #endif /* LIBC_SCCS and not lint */
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD: stable/6/lib/libc/stdio/fwalk.c 92986 2002-03-22 21:53:29Z obrien $");
   42 
   43 #include <sys/types.h>
   44 #include <machine/atomic.h>
   45 #include <stdio.h>
   46 #include "local.h"
   47 #include "glue.h"
   48 
   49 int
   50 _fwalk(function)
   51         int (*function)(FILE *);
   52 {
   53         FILE *fp;
   54         int n, ret;
   55         struct glue *g;
   56 
   57         ret = 0;
   58         /*
   59          * It should be safe to walk the list without locking it;
   60          * new nodes are only added to the end and none are ever
   61          * removed.
   62          *
   63          * Avoid locking this list while walking it or else you will
   64          * introduce a potential deadlock in [at least] refill.c.
   65          */
   66         for (g = &__sglue; g != NULL; g = g->next)
   67                 for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
   68                         if ((fp->_flags != 0) && ((fp->_flags & __SIGN) == 0))
   69                                 ret |= (*function)(fp);
   70         return (ret);
   71 }

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