diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-linux-mremap1.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/tst-linux-mremap1.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-linux-mremap1.c b/sysdeps/unix/sysv/linux/tst-linux-mremap1.c new file mode 100644 index 0000000000..408e8af2ab --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-linux-mremap1.c @@ -0,0 +1,63 @@ +/* Test mremap with MREMAP_DONTUNMAP. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <sys/mman.h> +#include <support/xstdlib.h> +#include <support/xunistd.h> +#include <support/check.h> +#include <support/test-driver.h> +#include <mremap-failure.h> + +static int +do_test (void) +{ + size_t old_size = getpagesize (); + size_t new_size = old_size; + char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1); + old_addr[0] = 1; + old_addr[old_size - 1] = 2; + + /* Create an available 64-page mmap region. */ + size_t fixed_size = old_size * 64; + char *fixed_addr = xmmap (NULL, fixed_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1); + xmunmap (fixed_addr, fixed_size); + + /* Add 3 * pagesize. */ + fixed_size += 3 * old_size; + + /* Test MREMAP_DONTUNMAP. It should return FIXED_ADDR created above. */ + char *new_addr = mremap (old_addr, old_size, new_size, + MREMAP_DONTUNMAP | MREMAP_MAYMOVE, + fixed_addr); + if (new_addr == MAP_FAILED) + return mremap_failure_exit (errno); + TEST_VERIFY_EXIT (fixed_addr == new_addr); + old_addr[0] = 3; + old_addr[old_size - 1] = 4; + new_addr[0] = 1; + new_addr[new_size - 1] = 2; + xmunmap (new_addr, new_size); + xmunmap (old_addr, old_size); + + return 0; +} + +#include <support/test-driver.c> |