| 1 | /* Test the mlock2 function. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include <stdio.h> |
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| 20 | #include <support/check.h> |
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| 21 | #include <support/xunistd.h> |
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| 22 | #include <sys/mman.h> |
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| 23 | |
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| 24 | /* Allocate a page using mmap. */ |
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| 25 | static void * |
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| 26 | get_page (void) |
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| 27 | { |
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| 28 | return xmmap (NULL, length: 1, PROT_READ | PROT_WRITE, |
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| 29 | MAP_ANONYMOUS | MAP_PRIVATE, fd: -1); |
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| 30 | } |
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| 31 | |
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| 32 | static int |
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| 33 | do_test (void) |
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| 34 | { |
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| 35 | /* Current kernels have a small reserve of locked memory, so this |
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| 36 | test does not need any privileges to run. */ |
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| 37 | |
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| 38 | void *page = get_page (); |
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| 39 | if (mlock (addr: page, len: 1) != 0) |
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| 40 | FAIL_EXIT1 ("mlock: %m\n" ); |
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| 41 | xmunmap (addr: page, length: 1); |
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| 42 | |
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| 43 | page = get_page (); |
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| 44 | if (mlock2 (addr: page, length: 1, flags: 0) != 0) |
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| 45 | /* Should be implemented using mlock if necessary. */ |
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| 46 | FAIL_EXIT1 ("mlock2 (0): %m\n" ); |
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| 47 | xmunmap (addr: page, length: 1); |
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| 48 | |
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| 49 | page = get_page (); |
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| 50 | int ret = mlock2 (addr: page, length: 1, MLOCK_ONFAULT); |
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| 51 | if (ret != 0) |
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| 52 | { |
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| 53 | TEST_VERIFY (ret == -1); |
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| 54 | if (errno != EINVAL) |
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| 55 | /* EINVAL means the system does not support the mlock2 system |
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| 56 | call. */ |
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| 57 | FAIL_EXIT1 ("mlock2 (0): %m\n" ); |
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| 58 | else |
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| 59 | puts (s: "warning: mlock2 system call not supported" ); |
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| 60 | } |
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| 61 | xmunmap (addr: page, length: 1); |
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| 62 | |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | #include <support/test-driver.c> |
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| 67 | |
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