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/* Implement fopen_unlocked and related functions. |
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Copyright (C) 2005, 2011 Free Software Foundation, Inc. |
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Written by Kaveh R. Ghazi . |
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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 |
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#ifdef HAVE_STDIO_EXT_H |
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#include |
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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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} |