| /* Test the mlock2 function. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <support/check.h> |
| #include <support/xunistd.h> |
| #include <sys/mman.h> |
| |
| /* Allocate a page using mmap. */ |
| static void * |
| get_page (void) |
| { |
| return xmmap (NULL, 1, PROT_READ | PROT_WRITE, |
| MAP_ANONYMOUS | MAP_PRIVATE, -1); |
| } |
| |
| static int |
| do_test (void) |
| { |
| /* Current kernels have a small reserve of locked memory, so this |
| test does not need any privileges to run. */ |
| |
| void *page = get_page (); |
| if (mlock (page, 1) != 0) |
| FAIL_EXIT1 ("mlock: %m\n"); |
| xmunmap (page, 1); |
| |
| page = get_page (); |
| if (mlock2 (page, 1, 0) != 0) |
| /* Should be implemented using mlock if necessary. */ |
| FAIL_EXIT1 ("mlock2 (0): %m\n"); |
| xmunmap (page, 1); |
| |
| page = get_page (); |
| int ret = mlock2 (page, 1, MLOCK_ONFAULT); |
| if (ret != 0) |
| { |
| TEST_VERIFY (ret == -1); |
| if (errno != EINVAL) |
| /* EINVAL means the system does not support the mlock2 system |
| call. */ |
| FAIL_EXIT1 ("mlock2 (0): %m\n"); |
| else |
| puts ("warning: mlock2 system call not supported"); |
| } |
| xmunmap (page, 1); |
| |
| return 0; |
| } |
| |
| #include <support/test-driver.c> |
