129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/* Implement fopen_unlocked and related functions.
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/*
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@deftypefn Extension void unlock_stream (FILE * @var{stream})
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If the OS supports it, ensure that the supplied stream is setup to
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avoid any multi-threaded locking. Otherwise leave the @code{FILE}
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pointer unchanged. If the @var{stream} is @code{NULL} do nothing.
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@end deftypefn
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@deftypefn Extension void unlock_std_streams (void)
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If the OS supports it, ensure that the standard I/O streams,
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@code{stdin}, @code{stdout} and @code{stderr} are setup to avoid any
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multi-threaded locking. Otherwise do nothing.
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@end deftypefn
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@deftypefn Extension {FILE *} fopen_unlocked (const char *@var{path}, @
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const char * @var{mode})
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Opens and returns a @code{FILE} pointer via @code{fopen}. If the
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operating system supports it, ensure that the stream is setup to avoid
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any multi-threaded locking. Otherwise return the @code{FILE} pointer
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unchanged.
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@end deftypefn
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@deftypefn Extension {FILE *} fdopen_unlocked (int @var{fildes}, @
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const char * @var{mode})
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Opens and returns a @code{FILE} pointer via @code{fdopen}. If the
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operating system supports it, ensure that the stream is setup to avoid
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any multi-threaded locking. Otherwise return the @code{FILE} pointer
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unchanged.
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@end deftypefn
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@deftypefn Extension {FILE *} freopen_unlocked (const char * @var{path}, @
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const char * @var{mode}, FILE * @var{stream})
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Opens and returns a @code{FILE} pointer via @code{freopen}. If the
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operating system supports it, ensure that the stream is setup to avoid
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any multi-threaded locking. Otherwise return the @code{FILE} pointer
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unchanged.
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@end deftypefn
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDIO_EXT_H
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#include <stdio_ext.h>
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#endif
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#include "libiberty.h"
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/* This is an inline helper function to consolidate attempts to unlock
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a stream. */
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static inline void
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unlock_1 (FILE *const fp ATTRIBUTE_UNUSED)
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{
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#if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)
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if (fp)
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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#endif
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}
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void
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unlock_stream (FILE *fp)
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{
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unlock_1 (fp);
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}
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void
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unlock_std_streams (void)
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{
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unlock_1 (stdin);
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unlock_1 (stdout);
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unlock_1 (stderr);
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}
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FILE *
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fopen_unlocked (const char *path, const char *mode)
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{
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FILE *const fp = fopen (path, mode);
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unlock_1 (fp);
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return fp;
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}
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FILE *
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fdopen_unlocked (int fildes, const char *mode)
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{
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FILE *const fp = fdopen (fildes, mode);
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unlock_1 (fp);
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return fp;
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}
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FILE *
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freopen_unlocked (const char *path, const char *mode, FILE *stream)
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{
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FILE *const fp = freopen (path, mode, stream);
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unlock_1 (fp);
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return fp;
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}
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