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/* Implement fopen_unlocked and related functions.

   Copyright (C) 2005 Free Software Foundation, Inc.

   Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If

not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

/*

@deftypefn Extension void unlock_stream (FILE * @var{stream})

If the OS supports it, ensure that the supplied stream is setup to

avoid any multi-threaded locking.  Otherwise leave the @code{FILE}

pointer unchanged.  If the @var{stream} is @code{NULL} do nothing.

@end deftypefn

@deftypefn Extension void unlock_std_streams (void)

If the OS supports it, ensure that the standard I/O streams,

@code{stdin}, @code{stdout} and @code{stderr} are setup to avoid any

multi-threaded locking.  Otherwise do nothing.

@end deftypefn

@deftypefn Extension {FILE *} fopen_unlocked (const char *@var{path}, const char * @var{mode})

Opens and returns a @code{FILE} pointer via @code{fopen}.  If the

operating system supports it, ensure that the stream is setup to avoid

any multi-threaded locking.  Otherwise return the @code{FILE} pointer

unchanged.

@end deftypefn

@deftypefn Extension {FILE *} fdopen_unlocked (int @var{fildes}, const char * @var{mode})

Opens and returns a @code{FILE} pointer via @code{fdopen}.  If the

operating system supports it, ensure that the stream is setup to avoid

any multi-threaded locking.  Otherwise return the @code{FILE} pointer

unchanged.

@end deftypefn

@deftypefn Extension {FILE *} freopen_unlocked (const char * @var{path}, const char * @var{mode}, FILE * @var{stream})

Opens and returns a @code{FILE} pointer via @code{freopen}.  If the

operating system supports it, ensure that the stream is setup to avoid

any multi-threaded locking.  Otherwise return the @code{FILE} pointer

unchanged.

@end deftypefn

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#ifdef HAVE_STDIO_EXT_H

#include <stdio_ext.h>

#endif

#include "libiberty.h"

/* This is an inline helper function to consolidate attempts to unlock

   a stream.  */

static inline void

unlock_1 (FILE *const fp ATTRIBUTE_UNUSED)

{

#if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)

  if (fp)

    __fsetlocking (fp, FSETLOCKING_BYCALLER);

#endif

}

void

unlock_stream (FILE *fp)

{

  unlock_1 (fp);

}

void

unlock_std_streams (void)

{

  unlock_1 (stdin);

  unlock_1 (stdout);

  unlock_1 (stderr);

}

FILE *

fopen_unlocked (const char *path, const char *mode)

{

  FILE *const fp = fopen (path, mode);

  unlock_1 (fp);

  return fp;

}

FILE *

fdopen_unlocked (int fildes, const char *mode)

{

  FILE *const fp = fdopen (fildes, mode);

  unlock_1 (fp);

  return fp;

}

FILE *

freopen_unlocked (const char *path, const char *mode, FILE *stream)

{

  FILE *const fp = freopen (path, mode, stream);

  unlock_1 (fp);

  return fp;

}