1 /* scoped_mmap, automatically unmap files 2 3 Copyright (C) 2018-2023 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 #include "common-defs.h" 21 #include "scoped_mmap.h" 22 #include "scoped_fd.h" 23 #include "gdbsupport/filestuff.h" 24 25 #ifdef HAVE_SYS_MMAN_H 26 27 scoped_mmap 28 mmap_file (const char *filename) 29 { 30 scoped_fd fd = gdb_open_cloexec (filename, O_RDONLY, 0); 31 if (fd.get () < 0) 32 perror_with_name (("open")); 33 34 off_t size = lseek (fd.get (), 0, SEEK_END); 35 if (size < 0) 36 perror_with_name (("lseek")); 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) 44 perror_with_name (("mmap")); 45 46 return mmapped_file; 47 } 48 49 #endif /* HAVE_SYS_MMAN_H */ 50