| /* Implement fopen_unlocked and related functions. |
| Copyright (C) 2005-2019 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; |
| } |