From 0aba1642aba74b172705e7f003185b997c7c6267 Mon Sep 17 00:00:00 2001
From: Shoaib Meenai <smeenai@fb.com>
Date: Fri, 18 Oct 2019 15:44:38 -0700
Subject: [PATCH] [compiler-rt] Use signal on Windows

sigaction doesn't exist on Windows, so use signal directly. Prefer
sigaction on other platforms because its semantics are well-defined.

Note that the Windows semantics for signal do reset the handler to
SIG_DFL, so we'd normally have to reinstall it manually. In this case,
our handler just exits, so we don't need to.
---
 compiler-rt/lib/profile/InstrProfilingFile.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/compiler-rt/lib/profile/InstrProfilingFile.c b/compiler-rt/lib/profile/InstrProfilingFile.c
index 9a47293f68c3b..858978b048f12 100644
--- a/compiler-rt/lib/profile/InstrProfilingFile.c
+++ b/compiler-rt/lib/profile/InstrProfilingFile.c
@@ -366,6 +366,18 @@ static void exitSignalHandler(int sig) {
   exit(0);
 }
 
+#if defined(_WIN32)
+// sigaction isn't available on Windows, so just use signal.
+static void installExitSignalHandlers(void) {
+  unsigned I;
+  for (I = 0; I < lprofCurFilename.NumExitSignals; ++I) {
+    if (signal(lprofCurFilename.ExitOnSignals[I], exitSignalHandler) == SIG_ERR)
+      PROF_WARN(
+          "Unable to install an exit signal handler for %d (errno = %d).\n",
+          lprofCurFilename.ExitOnSignals[I], errno);
+  }
+}
+#else
 static void installExitSignalHandlers(void) {
   unsigned I;
   struct sigaction sigact;
@@ -380,6 +392,7 @@ static void installExitSignalHandlers(void) {
           lprofCurFilename.ExitOnSignals[I], err);
   }
 }
+#endif
 
 static const char *DefaultProfileName = "default.profraw";
 static void resetFilenameToDefault(void) {