1 /* Memory allocation next to an unmapped page. 2 Copyright (C) 2017-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef SUPPORT_NEXT_TO_FAULT_H 20 #define SUPPORT_NEXT_TO_FAULT_H 21 22 #include <sys/cdefs.h> 23 #include <sys/types.h> 24 25 __BEGIN_DECLS 26 27 /* The memory region created by next_to_fault_allocate. */ 28 struct support_next_to_fault 29 { 30 /* The user data. */ 31 char *buffer; 32 size_t length; 33 34 /* The entire allocated region. */ 35 void *region_start; 36 size_t region_size; 37 }; 38 39 /* Allocate a buffer of SIZE bytes just before a page which is mapped 40 with PROT_NONE (so that overrunning the buffer will cause a 41 fault). */ 42 struct support_next_to_fault support_next_to_fault_allocate (size_t size); 43 44 /* Deallocate the memory region allocated by 45 next_to_fault_allocate. */ 46 void support_next_to_fault_free (struct support_next_to_fault *); 47 48 #endif /* SUPPORT_NEXT_TO_FAULT_H */ 49