Fix SIG_UNBLOCK emulation

--HG--
branch : 1.7

diff --git a/sigaction.c b/sigaction.c
index aee0abfd052d1968738f420ca40a855de08dd143..670e87eccc3cee72d2ceca365e9da653cd8a6837 100644 (file)
--- a/sigaction.c
+++ b/sigaction.c
@@ -121,7 +121,7 @@ sigprocmask(how, set, oset)
                mask = sigblock(*set);
                break;
            case SIG_UNBLOCK:
-               mask = sigsetmask(~*set);
+               mask = sigsetmask(sigblock(0) & ~(*set));
                break;
            case SIG_SETMASK:
                mask = sigsetmask(*set);