1 /* scoped_mmap, automatically unmap files 2 3 Copyright (C) 2018-2024 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 "scoped_mmap.h" 21 #include "scoped_fd.h" 22 #include "gdbsupport/filestuff.h" 23 24 #ifdef HAVE_SYS_MMAN_H 25 26 scoped_mmap 27 mmap_file (const char *filename) 28 { 29 scoped_fd fd = gdb_open_cloexec (filename, O_RDONLY, 0); 30 if (fd.get () < 0) 31 perror_with_name (("open")); 32 33 off_t size = lseek (fd.get (), 0, SEEK_END); 34 if (size < 0) 35 perror_with_name (("lseek")); 36 37 /* We can't map an empty file. */ 38 if (size == 0) 39 error (_("file to mmap is empty")); 40 41 scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0); 42 if (mmapped_file.get () == MAP_FAILED) 43 perror_with_name (("mmap")); 44 45 return mmapped_file; 46 } 47 48 #endif /* HAVE_SYS_MMAN_H */ 49