From 3b58dbbe0c83b81dd5ad1654bb2f6330f8e0f2f9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C5=8Dshin?= <git@wholezero.org>
Date: Fri, 15 Dec 2023 14:56:18 +0000
Subject: [PATCH] GetProgramExecutableName handles old loaders

---
 libc/calls/getprogramexecutablename.greg.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libc/calls/getprogramexecutablename.greg.c b/libc/calls/getprogramexecutablename.greg.c
index 32422e9e8..1717ed091 100644
--- a/libc/calls/getprogramexecutablename.greg.c
+++ b/libc/calls/getprogramexecutablename.greg.c
@@ -97,14 +97,18 @@ static inline void InitProgramExecutableNameImpl(void) {
     }
     cmd[3] = -1;  // current process
     if (sys_sysctl(cmd, ARRAYLEN(cmd), b, &n, 0, 0) != -1) {
-      goto UseBuf;
+      if (strcmp(b, "/usr/bin/ape")) {  // XX old loader; warn?
+        goto UseBuf;
+      }
     }
   }
   if (IsLinux()) {
     if ((got = sys_readlinkat(AT_FDCWD, "/proc/self/exe", b, n)) > 0 ||
         (got = sys_readlinkat(AT_FDCWD, "/proc/curproc/file", b, n)) > 0) {
       b[got] = 0;
-      goto UseBuf;
+      if (strcmp(b, "/usr/bin/ape")) {
+        goto UseBuf;
+      }
     }
   }