From a4dd0ad63c00f4dee3b86dfd3075d1d61b2b3180 Mon Sep 17 00:00:00 2001 From: sanine Date: Sat, 27 Aug 2022 23:52:56 -0500 Subject: add plibsys --- 3rdparty/plibsys/src/psysclose-darwin.c | 93 +++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 3rdparty/plibsys/src/psysclose-darwin.c (limited to '3rdparty/plibsys/src/psysclose-darwin.c') diff --git a/3rdparty/plibsys/src/psysclose-darwin.c b/3rdparty/plibsys/src/psysclose-darwin.c new file mode 100644 index 0000000..7c44024 --- /dev/null +++ b/3rdparty/plibsys/src/psysclose-darwin.c @@ -0,0 +1,93 @@ +/* + * The MIT License + * + * Copyright (C) 2016 Alexander Saprykin + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * 'Software'), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY + * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/* + * Copyright 2013 The Chromium Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * http://crbug.com/269623 + * http://openradar.appspot.com/14999594 + * + * When the default version of close used on macOS fails with EINTR, the + * file descriptor is not in a deterministic state. It may have been closed, + * or it may not have been. This makes it impossible to gracefully recover + * from the error. If the close is retried after the FD has been closed, the + * subsequent close can report EBADF, or worse, it can close an unrelated FD + * opened by another thread. If the close is not retried after the FD has been + * left open, the FD is leaked. Neither of these are good options. + * + * macOS provides an alternate version of close, close$NOCANCEL. This + * version will never fail with EINTR before the FD is actually closed. With + * this version, it is thus safe to call close without checking for EINTR (as + * the HANDLE_EINTR macro does) and not risk leaking the FD. In fact, mixing + * this verison of close with HANDLE_EINTR is hazardous. + * + * The $NOCANCEL variants of various system calls are activated by compiling + * with __DARWIN_NON_CANCELABLE, which prevents them from being pthread + * cancellation points. Rather than taking such a heavy-handed approach, this + * file implements an alternative: to use the $NOCANCEL variant of close (thus + * preventing it from being a pthread cancellation point) without affecting + * any other system calls. + * + * This file operates by providing a close function with the non-$NOCANCEL + * symbol name expected for the compilation environment as set by + * and (the DARWIN_ALIAS_C macro). That function calls the + * $NOCANCEL variant, which is resolved from libsyscall. By linking with this + * version of close prior to the libsyscall version, close's implementation is + * overridden. + */ + +#include + +/* If the non-cancelable variants of all system calls have already been chosen, + * do nothing. */ +#if !__DARWIN_NON_CANCELABLE +# if __DARWIN_UNIX03 && !__DARWIN_ONLY_UNIX_CONFORMANCE +/* When there's a choice between UNIX2003 and pre-UNIX2003 and UNIX2003 has + * been chosen. */ +extern int close$NOCANCEL$UNIX2003 (int fd); +# define PLIBSYS_CLOSE_INTERFACE close$NOCANCEL$UNIX2003 +# elif !__DARWIN_UNIX03 && !__DARWIN_ONLY_UNIX_CONFORMANCE +/* When there's a choice between UNIX2003 and pre-UNIX2003 and pre-UNIX2003 + * has been chosen. There's no close$NOCANCEL symbol in this case, so use + * close$NOCANCEL$UNIX2003 as the implementation. It does the same thing that + * close$NOCANCEL would do. */ +extern int close$NOCANCEL$UNIX2003 (int fd); +# define PLIBSYS_CLOSE_INTERFACE close$NOCANCEL$UNIX2003 +# else +/* When only UNIX2003 is supported. */ +extern int close$NOCANCEL (int fd); +# define PLIBSYS_CLOSE_INTERFACE close$NOCANCEL +# endif +#endif + +#include "psysclose-private.h" + +pint +p_sys_close (pint fd) +{ + return PLIBSYS_CLOSE_INTERFACE (fd); +} -- cgit v1.2.1