win32.c: no error after retry

* win32/win32.c (waitpid): return 0 on error after retried.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/win32/win32.c b/win32/win32.c
index 0fc4186fff..0290b89825 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -4144,6 +4144,7 @@ waitpid(rb_pid_t pid, int *stat_loc, int options)
     }
     else {
 	struct ChildRecord* child = FindChildSlot(pid);
+	int retried = 0;
 	if (!child) {
 	    errno = ECHILD;
 	    return -1;
@@ -4157,8 +4158,10 @@ waitpid(rb_pid_t pid, int *stat_loc, int options)
 		    pid = 0;
 		    break;
 		}
+		++retried;
 	    }
 	}
+	if (pid == -1 && retried) pid = 0;
     }
 
     return pid;