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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [libiberty/] [fopen_unlocked.c] - Rev 267
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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; }
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