From 0e09ba3cd6baa291415d953f3a4725f85ed3b729 Mon Sep 17 00:00:00 2001
From: Jean Boussier <byroot@ruby-lang.org>
Date: Mon, 22 Jan 2024 12:26:36 +0100
Subject: [PATCH] posix_spawn: handle executable being a directory

---
 process.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/process.c b/process.c
index 3de3710254f864..69cfc56ca78d4f 100644
--- a/process.c
+++ b/process.c
@@ -4757,7 +4757,16 @@ rb_posix_spawn(struct rb_execarg *eargp)
         // posix_spawn only returns fork/vfork/clone failures.
         // If it failed but errno == 0, then it must be an "exec" failure.
         if (errno == 0) {
-            eaccess(abspath, X_OK);
+            if (!eaccess(abspath, X_OK)) {
+                // abspath is executable
+                struct stat file_stat;
+                if (stat(abspath, &file_stat)) {
+                    rb_sys_fail(abspath);
+                }
+                if (S_ISDIR(file_stat.st_mode)) {
+                    errno = EISDIR;
+                }
+            }
         }
         rb_sys_fail(abspath);
     }