diff options
Diffstat (limited to 'lib/libc/stdio/fwalk.c')
| -rw-r--r-- | lib/libc/stdio/fwalk.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libc/stdio/fwalk.c b/lib/libc/stdio/fwalk.c new file mode 100644 index 000000000000..b943be42c010 --- /dev/null +++ b/lib/libc/stdio/fwalk.c @@ -0,0 +1,73 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)fwalk.c 8.1 (Berkeley) 6/4/93"; +#endif +static const char rcsid[] = + "$FreeBSD$"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <machine/atomic.h> +#include <stdio.h> +#include "local.h" +#include "glue.h" + +int +_fwalk(function) + int (*function)(FILE *); +{ + FILE *fp; + int n, ret; + struct glue *g; + + ret = 0; + /* + * It should be safe to walk the list without locking it; + * new nodes are only added to the end and none are ever + * removed. + * + * Avoid locking this list while walking it or else you will + * introduce a potential deadlock in [at least] refill.c. + */ + for (g = &__sglue; g != NULL; g = g->next) + for (fp = g->iobs, n = g->niobs; --n >= 0; fp++) + if ((fp->_flags != 0) && ((fp->_flags & __SIGN) == 0)) + ret |= (*function)(fp); + return (ret); +} |