50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
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/* scoped_mmap, automatically unmap files
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#include "scoped_mmap.h"
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#include "scoped_fd.h"
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#include "gdbsupport/filestuff.h"
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#ifdef HAVE_SYS_MMAN_H
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scoped_mmap
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mmap_file (const char *filename)
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{
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scoped_fd fd = gdb_open_cloexec (filename, O_RDONLY, 0);
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if (fd.get () < 0)
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perror_with_name (("open"));
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off_t size = lseek (fd.get (), 0, SEEK_END);
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if (size < 0)
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perror_with_name (("lseek"));
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/* We can't map an empty file. */
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if (size == 0)
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error (_("file to mmap is empty"));
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scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0);
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if (mmapped_file.get () == MAP_FAILED)
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perror_with_name (("mmap"));
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return mmapped_file;
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}
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#endif /* HAVE_SYS_MMAN_H */
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