[lldb] [MainLoop] Report errno for failed kevent()

Modify the kevent() error reporting to use errno rather than returning
the return value.  At least on FreeBSD and NetBSD, kevent() always
returns -1 in case of error, and the actual error is returned via errno.

Differential Revision: https://reviews.llvm.org/D58229

llvm-svn: 354029

1 files changed, 1 insertions, 1 deletions

diff --git a/lldb/source/Host/common/MainLoop.cpp b/lldb/source/Host/common/MainLoop.cpp
index 6f8d1168a2b..8a40d427abe 100644
--- a/lldb/source/Host/common/MainLoop.cpp
+++ b/lldb/source/Host/common/MainLoop.cpp
@@ -108,7 +108,7 @@ Status MainLoop::RunImpl::Poll() {
                       out_events, llvm::array_lengthof(out_events), nullptr);
 
   if (num_events < 0)
-    return Status("kevent() failed with error %d\n", num_events);
+    return Status(errno, eErrorTypePOSIX);
   return Status();
 }