| 1 | /* Test mremap with MREMAP_DONTUNMAP. |
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| 2 | Copyright (C) 2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <sys/mman.h> |
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| 21 | #include <support/xstdlib.h> |
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| 22 | #include <support/xunistd.h> |
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| 23 | #include <support/check.h> |
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| 24 | #include <support/test-driver.h> |
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| 25 | #include <mremap-failure.h> |
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| 26 | |
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| 27 | static int |
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| 28 | do_test (void) |
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| 29 | { |
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| 30 | size_t old_size = getpagesize (); |
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| 31 | size_t new_size = old_size; |
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| 32 | char *old_addr = xmmap (NULL, length: old_size, PROT_READ | PROT_WRITE, |
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| 33 | MAP_PRIVATE | MAP_ANONYMOUS, fd: -1); |
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| 34 | old_addr[0] = 1; |
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| 35 | old_addr[old_size - 1] = 2; |
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| 36 | |
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| 37 | /* Create an available 64-page mmap region. */ |
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| 38 | size_t fixed_size = old_size * 64; |
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| 39 | char *fixed_addr = xmmap (NULL, length: fixed_size, PROT_READ | PROT_WRITE, |
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| 40 | MAP_PRIVATE | MAP_ANONYMOUS, fd: -1); |
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| 41 | xmunmap (addr: fixed_addr, length: fixed_size); |
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| 42 | |
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| 43 | /* Add 3 * pagesize. */ |
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| 44 | fixed_size += 3 * old_size; |
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| 45 | |
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| 46 | /* Test MREMAP_DONTUNMAP. It should return FIXED_ADDR created above. */ |
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| 47 | char *new_addr = mremap (addr: old_addr, old_len: old_size, new_len: new_size, |
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| 48 | MREMAP_DONTUNMAP | MREMAP_MAYMOVE, |
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| 49 | fixed_addr); |
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| 50 | if (new_addr == MAP_FAILED) |
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| 51 | return mremap_failure_exit (errno); |
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| 52 | TEST_VERIFY_EXIT (fixed_addr == new_addr); |
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| 53 | old_addr[0] = 3; |
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| 54 | old_addr[old_size - 1] = 4; |
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| 55 | new_addr[0] = 1; |
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| 56 | new_addr[new_size - 1] = 2; |
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| 57 | xmunmap (addr: new_addr, length: new_size); |
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| 58 | xmunmap (addr: old_addr, length: old_size); |
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| 59 | |
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| 60 | return 0; |
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| 61 | } |
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| 62 | |
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| 63 | #include <support/test-driver.c> |
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| 64 | |
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