1 | /* |
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2 | * Copyright (c) 1990 The Regents of the University of California. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms are permitted |
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6 | * provided that the above copyright notice and this paragraph are |
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7 | * duplicated in all such forms and that any documentation, |
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8 | * advertising materials, and other materials related to such |
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9 | * distribution and use acknowledge that the software was developed |
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10 | * by the University of California, Berkeley. The name of the |
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11 | * University may not be used to endorse or promote products derived |
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12 | * from this software without specific prior written permission. |
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13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | */ |
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17 | /* No user fns here. Pesch 15apr92. */ |
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18 | |
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19 | #if defined(LIBC_SCCS) && !defined(lint) |
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20 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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21 | #endif /* LIBC_SCCS and not lint */ |
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22 | |
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23 | #include <_ansi.h> |
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24 | #include <reent.h> |
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25 | #include <stdio.h> |
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26 | #include <stdlib.h> |
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27 | #include <errno.h> |
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28 | #include "local.h" |
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29 | |
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30 | int |
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31 | _fwalk (struct _reent *ptr, |
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32 | register int (*function) (FILE *)) |
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33 | { |
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34 | register FILE *fp; |
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35 | register int n, ret = 0; |
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36 | register struct _glue *g; |
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37 | |
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38 | /* |
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39 | * It should be safe to walk the list without locking it; |
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40 | * new nodes are only added to the end and none are ever |
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41 | * removed. |
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42 | * |
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43 | * Avoid locking this list while walking it or else you will |
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44 | * introduce a potential deadlock in [at least] refill.c. |
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45 | */ |
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46 | for (g = &ptr->__sglue; g != NULL; g = g->_next) |
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47 | for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++) |
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48 | if (fp->_flags != 0 && fp->_flags != 1 && fp->_file != -1) |
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49 | ret |= (*function) (fp); |
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50 | |
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51 | return ret; |
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52 | } |
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53 | |
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54 | /* Special version of __fwalk where the function pointer is a reentrant |
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55 | I/O function (e.g. _fclose_r). */ |
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56 | int |
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57 | _fwalk_reent (struct _reent *ptr, |
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58 | register int (*reent_function) (struct _reent *, FILE *)) |
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59 | { |
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60 | register FILE *fp; |
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61 | register int n, ret = 0; |
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62 | register struct _glue *g; |
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63 | |
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64 | /* |
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65 | * It should be safe to walk the list without locking it; |
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66 | * new nodes are only added to the end and none are ever |
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67 | * removed. |
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68 | * |
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69 | * Avoid locking this list while walking it or else you will |
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70 | * introduce a potential deadlock in [at least] refill.c. |
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71 | */ |
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72 | for (g = &ptr->__sglue; g != NULL; g = g->_next) |
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73 | for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++) |
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74 | if (fp->_flags != 0 && fp->_flags != 1 && fp->_file != -1) |
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75 | ret |= (*reent_function) (ptr, fp); |
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76 | |
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77 | return ret; |
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78 | } |
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