Fix setting pipe as nonblocking (#61126)

dotnet · Nov 26, 2021 · c00b068 · c00b068
1 parent 90b8c70
commit c00b068
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/src/coreclr/pal/src/debug/debug.cpp b/src/coreclr/pal/src/debug/debug.cpp
@@ -742,15 +742,19 @@ PAL_ProbeMemory(
     BOOL fWriteAccess)
 {
     int fds[2];
+    int flags;
 
     if (pipe(fds) != 0)
     {
         ASSERT("pipe failed: errno is %d (%s)\n", errno, strerror(errno));
         return FALSE;
     }
 
-    fcntl(fds[0], O_NONBLOCK);
-    fcntl(fds[1], O_NONBLOCK);
+    flags = fcntl(fds[0], F_GETFL, 0);
+    fcntl(fds[0], F_SETFL, flags | O_NONBLOCK);
+
+    flags = fcntl(fds[1], F_GETFL, 0);
+    fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
 
     PVOID pEnd = (PBYTE)pBuffer + cbBuffer;
     BOOL result = TRUE;