50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Test that fadvise works as advertised.
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Copyright (C) 2010-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Pádraig Brady. */
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#include <config.h>
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#include <stdio.h>
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#include "fadvise.h"
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/* We ignore any errors as these hints are only advisory.
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* There is the chance one can pass invalid ADVICE, which will
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* not be indicated, but given the simplicity of the interface
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* this is unlikely. Also not returning errors allows the
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* unconditional passing of descriptors to non standard files,
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* which will just be ignored if unsupported. */
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int
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main (void)
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{
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/* Valid. */
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fadvise (stdin, FADVISE_SEQUENTIAL);
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fdadvise (fileno (stdin), 0, 0, FADVISE_RANDOM);
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/* Ignored. */
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fadvise (nullptr, FADVISE_RANDOM);
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/* Invalid. */
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fdadvise (42, 0, 0, FADVISE_RANDOM);
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/* Unfortunately C enums are not types.
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One could hack type safety by wrapping in a struct,
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but it's probably not worth the complexity in this case. */
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fadvise (stdin, FADVISE_SEQUENTIAL + FADVISE_RANDOM);
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fadvise (stdin, 4242);
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return 0;
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}
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