1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright 2021 Jessica Clarke <jrtc27@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
/*
* glibc's sys/wait.h and stdlib.h both define various wait-related constants,
* depending on __USE_XOPEN(2K8) and if the other header has been included.
* Since they each probe the other's include guard to determine that, there is
* a window between a header defining its include guard and checking for the
* other's within which, if the other is included for the first time, they both
* believe the other has already defined the relevant macros etc, and so
* neither ends up doing so. This was not previously hit, and is still not hit
* when using glibc normally (though seems extremely fragile). However, as of
* glibc 2.34, signal.h, included by sys/wait, includes a new bits/sigstksz,
* which in turn includes unistd.h (when _SC_SIGSTKSZ_SOURCE is defined, which
* is implied by _GNU_SOURCE), which we wrap and include stdlib.h from,
* creating the exact aforementioned situation that breaks. Thus, forcefully
* include stdlib.h first whenever sys/wait.h is as a workaround, since that
* way round still works.
*/
#include <stdlib.h>
#include_next <sys/wait.h>
|
