use SIGCHLD_LOSSY to enable waitpid polling mode

Some systems lack SIGCHLD or have incomplete SIGCHLD
implementations.  So enable polling mode for them.

[ruby-core:87705] [Bug #14867]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63795 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/process.c b/process.c
index 08986f9ede..ef0523165e 100644
--- a/process.c
+++ b/process.c
@@ -1126,7 +1126,7 @@ rb_waitpid(rb_pid_t pid, int *st, int flags)
     waitpid_state_init(&w, pid, flags);
     w.ec = GET_EC();
 
-    if (RUBY_SIGCHLD) {
+    if (RUBY_SIGCHLD || SIGCHLD_LOSSY) {
         waitpid_wait(&w);
     }
     else {