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67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* Test the mlock2 function.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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#include <sys/mman.h>
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/* Allocate a page using mmap. */
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static void *
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get_page (void)
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{
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return xmmap (NULL, 1, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1);
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}
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static int
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do_test (void)
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{
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/* Current kernels have a small reserve of locked memory, so this
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test does not need any privileges to run. */
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void *page = get_page ();
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if (mlock (page, 1) != 0)
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FAIL_EXIT1 ("mlock: %m\n");
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xmunmap (page, 1);
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page = get_page ();
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if (mlock2 (page, 1, 0) != 0)
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/* Should be implemented using mlock if necessary. */
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FAIL_EXIT1 ("mlock2 (0): %m\n");
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xmunmap (page, 1);
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page = get_page ();
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int ret = mlock2 (page, 1, MLOCK_ONFAULT);
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if (ret != 0)
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{
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TEST_VERIFY (ret == -1);
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if (errno != EINVAL)
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/* EINVAL means the system does not support the mlock2 system
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call. */
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FAIL_EXIT1 ("mlock2 (0): %m\n");
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else
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puts ("warning: mlock2 system call not supported");
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}
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xmunmap (page, 1);
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return 0;
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}
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#include <support/test-driver.c>
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