[deliverable/binutils-gdb.git] / gdbsupport / scoped_mmap.cc

/* scoped_mmap, automatically unmap files

   Copyright (C) 2018-2020 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 "common-defs.h"
#include "scoped_mmap.h"
#include "scoped_fd.h"
#include "gdbsupport/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 */
Commit	Line	Data
	1	/* scoped_mmap, automatically unmap files
	2
	3	Copyright (C) 2018-2020 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 */