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/* scoped_mmap, automatically unmap files
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "scoped_mmap.h"
#include "scoped_fd.h"
#include "common/filestuff.h"
#ifdef HAVE_SYS_MMAN_H
scoped_mmap
mmap_file (const char *filename)
{
scoped_fd fd (gdb_open_cloexec (filename, O_RDONLY, 0));
if (fd.get () < 0)
perror_with_name (("open"));
off_t size = lseek (fd.get (), 0, SEEK_END);
if (size < 0)
perror_with_name (("lseek"));
/* We can't map an empty file. */
if (size == 0)
error (_("file to mmap is empty"));
scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0);
if (mmapped_file.get () == MAP_FAILED)
perror_with_name (("mmap"));
return mmapped_file;
}
#endif /* HAVE_SYS_MMAN_H */
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