1 files changed, 2 insertions, 1 deletions
diff --git a/process.c b/process.c
index a3d3bcbb78..735dd2d855 100644
--- a/process.c
+++ b/process.c
@@ -7115,7 +7115,8 @@ rb_daemon(int nochdir, int noclose)
       default: _exit(EXIT_SUCCESS);
     }
 
-    if (setsid() < 0) return -1;
+    /* ignore EPERM which means already being process-leader */
+    if (setsid() < 0) (void)0;
 
     if (!nochdir)
         err = chdir("/");