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5c831bb1 SM |
1 | /* scoped_mmap, automatically unmap files |
2 | ||
3666a048 | 3 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
5c831bb1 SM |
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 | ||
26bfd823 | 20 | #include "common-defs.h" |
5c831bb1 SM |
21 | #include "scoped_mmap.h" |
22 | #include "scoped_fd.h" | |
268a13a5 | 23 | #include "gdbsupport/filestuff.h" |
5c831bb1 SM |
24 | |
25 | #ifdef HAVE_SYS_MMAN_H | |
26 | ||
27 | scoped_mmap | |
28 | mmap_file (const char *filename) | |
29 | { | |
65773341 | 30 | scoped_fd fd (gdb_open_cloexec (filename, O_RDONLY, 0)); |
5c831bb1 | 31 | if (fd.get () < 0) |
83c8d318 | 32 | perror_with_name (("open")); |
5c831bb1 SM |
33 | |
34 | off_t size = lseek (fd.get (), 0, SEEK_END); | |
35 | if (size < 0) | |
83c8d318 | 36 | perror_with_name (("lseek")); |
5c831bb1 SM |
37 | |
38 | /* We can't map an empty file. */ | |
39 | if (size == 0) | |
40 | error (_("file to mmap is empty")); | |
41 | ||
42 | scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0); | |
43 | if (mmapped_file.get () == MAP_FAILED) | |
83c8d318 | 44 | perror_with_name (("mmap")); |
5c831bb1 SM |
45 | |
46 | return mmapped_file; | |
47 | } | |
48 | ||
49 | #endif /* HAVE_SYS_MMAN_H */ |