signal: Add idempotent block function

This makes it trivial to block individual signals from being handled by
a thread. Useful when tryng to set up signal handling in event loops.

Tested:
    Builds and passes unit tests.

Change-Id: I61739debe2a47ec0ec3e767cf138125c6f59165f
Signed-off-by: William A. Kennington III <wak@google.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/test/placeholder.cpp b/test/placeholder.cpp
deleted file mode 100644
index 782277f..0000000
--- a/test/placeholder.cpp
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <gtest/gtest.h>
-
-TEST(PlaceholderTest, None)
-{
-}