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: src/lib/libc/stdio/fwalk.c,v 1.10 2007/01/09 00:28:06 imp Exp $");␊ |
38 | ␊ |
39 | #include <sys/types.h>␊ |
40 | #include <stdio.h>␊ |
41 | #include "local.h"␊ |
42 | #include "glue.h"␊ |
43 | ␊ |
44 | int␊ |
45 | _fwalk(function)␊ |
46 | ␉int (*function)(FILE *);␊ |
47 | {␊ |
48 | ␉FILE *fp;␊ |
49 | ␉int n, ret;␊ |
50 | ␉struct glue *g;␊ |
51 | ␊ |
52 | ␉ret = 0;␊ |
53 | ␉/*␊ |
54 | ␉ * It should be safe to walk the list without locking it;␊ |
55 | ␉ * new nodes are only added to the end and none are ever␊ |
56 | ␉ * removed.␊ |
57 | ␉ *␊ |
58 | ␉ * Avoid locking this list while walking it or else you will␊ |
59 | ␉ * introduce a potential deadlock in [at least] refill.c.␊ |
60 | ␉ */␊ |
61 | ␉for (g = &__sglue; g != NULL; g = g->next)␊ |
62 | ␉␉for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)␊ |
63 | ␉␉␉if ((fp->_flags != 0) && ((fp->_flags & __SIGN) == 0))␊ |
64 | ␉␉␉␉ret |= (*function)(fp);␊ |
65 | ␉return (ret);␊ |
66 | }␊ |
67 | |