De-duplicate cmUVSignalHackRAII

This was added separately in `cmCTestMultiProcessHandler` and
`cmQtAutoGenerator`.  Factor out the duplicate code into a common header
for re-use.

1 files changed, 2 insertions, 37 deletions

diff --git a/Source/CTest/cmCTestMultiProcessHandler.cxx b/Source/CTest/cmCTestMultiProcessHandler.cxx
index 45d5bde2c4..2821ab80aa 100644
--- a/Source/CTest/cmCTestMultiProcessHandler.cxx
+++ b/Source/CTest/cmCTestMultiProcessHandler.cxx
@@ -11,6 +11,8 @@
 
 #include "cm_uv.h"
 
+#include "cmUVSignalHackRAII.h" // IWYU pragma: keep
+
 #include "cmsys/FStream.hxx"
 #include "cmsys/String.hxx"
 #include "cmsys/SystemInformation.hxx"
@@ -25,43 +27,6 @@
 #include <stdlib.h>
 #include <utility>
 
-#if defined(CMAKE_USE_SYSTEM_LIBUV) && !defined(_WIN32) &&                    \
-  UV_VERSION_MAJOR == 1 && UV_VERSION_MINOR < 19
-#define CMAKE_UV_SIGNAL_HACK
-/*
-   libuv does not use SA_RESTART on its signal handler, but C++ streams
-   depend on it for reliable i/o operations.  This RAII helper convinces
-   libuv to install its handler, and then revises the handler to add the
-   SA_RESTART flag.  We use a distinct uv loop that never runs to avoid
-   ever really getting a callback.  libuv may fill the hack loop's signal
-   pipe and then stop writing, but that won't break any real loops.
- */
-class cmUVSignalHackRAII
-{
-  uv_loop_t HackLoop;
-  cm::uv_signal_ptr HackSignal;
-  static void HackCB(uv_signal_t*, int) {}
-public:
-  cmUVSignalHackRAII()
-  {
-    uv_loop_init(&this->HackLoop);
-    this->HackSignal.init(this->HackLoop);
-    this->HackSignal.start(HackCB, SIGCHLD);
-    struct sigaction hack_sa;
-    sigaction(SIGCHLD, nullptr, &hack_sa);
-    if (!(hack_sa.sa_flags & SA_RESTART)) {
-      hack_sa.sa_flags |= SA_RESTART;
-      sigaction(SIGCHLD, &hack_sa, nullptr);
-    }
-  }
-  ~cmUVSignalHackRAII()
-  {
-    this->HackSignal.stop();
-    uv_loop_close(&this->HackLoop);
-  }
-};
-#endif
-
 class TestComparator
 {
 public: