projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 84696f37 MM |
1 | /* scoped_mmap, automatically unmap files |
| 2 | ||
| 3 | Copyright (C) 2018 Free Software Foundation, Inc. | |
| 4 | ||
| 5 | This file is part of GDB. | |
| 6 | ||
| 7 | This program is free software; you can redistribute it and/or modify | |
| 8 | it under the terms of the GNU General Public License as published by | |
| 9 | the Free Software Foundation; either version 3 of the License, or | |
| 10 | (at your option) any later version. | |
| 11 | ||
| 12 | This program is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 | GNU General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU General Public License | |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 19 | ||
| 20 | #ifndef SCOPED_MMAP_H | |
| 21 | #define SCOPED_MMAP_H | |
| 22 | ||
| 23 | #include "config.h" | |
| 24 | ||
| 25 | #ifdef HAVE_SYS_MMAN_H | |
| 26 | ||
| 27 | #include <sys/mman.h> | |
| 28 | ||
| 29 | /* A smart-pointer-like class to mmap() and automatically munmap() a memory | |
| 30 | mapping. */ | |
| 31 | ||
| 32 | class scoped_mmap | |
| 33 | { | |
| 34 | public: | |
| 35 | scoped_mmap () noexcept : m_mem (MAP_FAILED), m_length (0) {} | |
| 36 | scoped_mmap (void *addr, size_t length, int prot, int flags, int fd, | |
| 37 | off_t offset) noexcept : m_length (length) | |
| 38 | { | |
| 39 | m_mem = mmap (addr, m_length, prot, flags, fd, offset); | |
| 40 | } | |
| 41 | ~scoped_mmap () | |
| 42 | { | |
| 43 | if (m_mem != MAP_FAILED) | |
| 44 | munmap (m_mem, m_length); | |
| 45 | } | |
| 46 | ||
| 47 | DISABLE_COPY_AND_ASSIGN (scoped_mmap); | |
| 48 | ||
| 49 | void *release () noexcept | |
| 50 | { | |
| 51 | void *mem = m_mem; | |
| 52 | m_mem = MAP_FAILED; | |
| 53 | m_length = 0; | |
| 54 | return mem; | |
| 55 | } | |
| 56 | ||
| 57 | void reset (void *addr, size_t length, int prot, int flags, int fd, | |
| 58 | off_t offset) noexcept | |
| 59 | { | |
| 60 | if (m_mem != MAP_FAILED) | |
| 61 | munmap (m_mem, m_length); | |
| 62 | ||
| 63 | m_length = length; | |
| 64 | m_mem = mmap (addr, m_length, prot, flags, fd, offset); | |
| 65 | } | |
| 66 | ||
| 67 | size_t size () const noexcept { return m_length; } | |
| 68 | void *get () const noexcept { return m_mem; } | |
| 69 | ||
| 70 | private: | |
| 71 | void *m_mem; | |
| 72 | size_t m_length; | |
| 73 | }; | |
| 74 | ||
| 75 | #endif /* HAVE_SYS_MMAN_H */ | |
| 76 | #endif /* SCOPED_MMAP_H */ |