| 1 | /* |
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| 2 | * Copyright (c) 2014 Red Hat, Inc. |
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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, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 24 | * SUCH DAMAGE. |
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| 25 | */ |
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| 26 | /* |
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| 27 | FUNCTION |
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| 28 | <<__fsetlocking>>---set or query locking mode on FILE stream |
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| 29 | |
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| 30 | INDEX |
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| 31 | __fsetlocking |
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| 32 | |
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| 33 | SYNOPSIS |
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| 34 | #include <stdio.h> |
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| 35 | #include <stdio_ext.h> |
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| 36 | int __fsetlocking(FILE *<[fp]>, int <[type]>); |
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| 37 | |
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| 38 | DESCRIPTION |
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| 39 | This function sets how the stdio functions handle locking of FILE <[fp]>. |
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| 40 | The following values describe <[type]>: |
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| 41 | |
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| 42 | <<FSETLOCKING_INTERNAL>> is the default state, where stdio functions |
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| 43 | automatically lock and unlock the stream. |
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| 44 | |
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| 45 | <<FSETLOCKING_BYCALLER>> means that automatic locking in stdio functions |
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| 46 | is disabled. Applications which set this take all responsibility for file |
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| 47 | locking themselves. |
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| 48 | |
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| 49 | <<FSETLOCKING_QUERY>> returns the current locking mode without changing it. |
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| 50 | |
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| 51 | RETURNS |
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| 52 | <<__fsetlocking>> returns the current locking mode of <[fp]>. |
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| 53 | |
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| 54 | PORTABILITY |
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| 55 | This function originates from Solaris and is also provided by GNU libc. |
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| 56 | |
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| 57 | No supporting OS subroutines are required. |
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| 58 | */ |
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| 59 | |
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| 60 | #ifndef __rtems__ |
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| 61 | |
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| 62 | #include <_ansi.h> |
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| 63 | #include <stdio.h> |
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| 64 | #include <stdio_ext.h> |
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| 65 | #include "local.h" |
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| 66 | |
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| 67 | int |
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| 68 | __fsetlocking (FILE * fp, |
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| 69 | int type) |
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| 70 | { |
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| 71 | int result; |
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| 72 | CHECK_INIT(_REENT, fp); |
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| 73 | result = (fp->_flags2 & __SNLK) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL; |
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| 74 | switch (type) |
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| 75 | { |
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| 76 | case FSETLOCKING_BYCALLER: |
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| 77 | fp->_flags2 |= __SNLK; |
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| 78 | break; |
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| 79 | case FSETLOCKING_INTERNAL: |
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| 80 | fp->_flags2 &= ~__SNLK; |
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| 81 | break; |
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| 82 | case FSETLOCKING_QUERY: |
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| 83 | default: |
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| 84 | break; |
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| 85 | } |
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| 86 | return result; |
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| 87 | } |
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| 88 | |
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| 89 | #endif /* __rtems__ */ |
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