gprofng: fix build with -mx32
[binutils-gdb/blckswan.git] / gdbsupport / scoped_mmap.h
blob6548d14dcae38b5eee3569a403c19492185718a9
1 /* scoped_mmap, automatically unmap files
3 Copyright (C) 2018-2022 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #ifndef COMMON_SCOPED_MMAP_H
21 #define COMMON_SCOPED_MMAP_H
23 #ifdef HAVE_SYS_MMAN_H
25 #include <sys/mman.h>
27 /* A smart-pointer-like class to mmap() and automatically munmap() a memory
28 mapping. */
30 class scoped_mmap
32 public:
33 scoped_mmap () noexcept : m_mem (MAP_FAILED), m_length (0) {}
34 scoped_mmap (void *addr, size_t length, int prot, int flags, int fd,
35 off_t offset) noexcept : m_length (length)
37 m_mem = mmap (addr, m_length, prot, flags, fd, offset);
40 ~scoped_mmap ()
42 destroy ();
45 scoped_mmap (scoped_mmap &&rhs) noexcept
46 : m_mem (rhs.m_mem),
47 m_length (rhs.m_length)
49 rhs.m_mem = MAP_FAILED;
50 rhs.m_length = 0;
53 DISABLE_COPY_AND_ASSIGN (scoped_mmap);
55 ATTRIBUTE_UNUSED_RESULT void *release () noexcept
57 void *mem = m_mem;
58 m_mem = MAP_FAILED;
59 m_length = 0;
60 return mem;
63 void reset (void *addr, size_t length, int prot, int flags, int fd,
64 off_t offset) noexcept
66 destroy ();
68 m_length = length;
69 m_mem = mmap (addr, m_length, prot, flags, fd, offset);
72 size_t size () const noexcept { return m_length; }
73 void *get () const noexcept { return m_mem; }
75 private:
76 void destroy ()
78 if (m_mem != MAP_FAILED)
79 munmap (m_mem, m_length);
82 void *m_mem;
83 size_t m_length;
86 /* Map FILENAME in memory. Throw an error if anything goes wrong. */
87 scoped_mmap mmap_file (const char *filename);
89 #endif /* HAVE_SYS_MMAN_H */
91 #endif /* COMMON_SCOPED_MMAP_H */