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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#pragma once
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#include "cmConfigure.h" // IWYU pragma: keep
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#include "cm_uv.h"
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#if defined(CMAKE_USE_SYSTEM_LIBUV) && !defined(_WIN32) && \
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UV_VERSION_MAJOR == 1 && UV_VERSION_MINOR < 19
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# define CMAKE_UV_SIGNAL_HACK
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# include "cmUVHandlePtr.h"
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/*
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libuv does not use SA_RESTART on its signal handler, but C++ streams
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depend on it for reliable i/o operations. This RAII helper convinces
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libuv to install its handler, and then revises the handler to add the
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SA_RESTART flag. We use a distinct uv loop that never runs to avoid
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ever really getting a callback. libuv may fill the hack loop's signal
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pipe and then stop writing, but that won't break any real loops.
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*/
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class cmUVSignalHackRAII
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{
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uv_loop_t HackLoop;
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cm::uv_signal_ptr HackSignal;
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static void HackCB(uv_signal_t*, int) {}
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public:
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cmUVSignalHackRAII()
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{
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uv_loop_init(&this->HackLoop);
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this->HackSignal.init(this->HackLoop);
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this->HackSignal.start(HackCB, SIGCHLD);
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struct sigaction hack_sa;
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sigaction(SIGCHLD, nullptr, &hack_sa);
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if (!(hack_sa.sa_flags & SA_RESTART)) {
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hack_sa.sa_flags |= SA_RESTART;
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sigaction(SIGCHLD, &hack_sa, nullptr);
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}
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}
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~cmUVSignalHackRAII()
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{
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this->HackSignal.stop();
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uv_loop_close(&this->HackLoop);
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}
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};
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#endif
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