From d36e7e0c7057cb1b9207e9a346b9f1535818196c Mon Sep 17 00:00:00 2001
From: Dan Gohman <dev@sunfishcode.online>
Date: Fri, 24 Oct 2025 18:00:19 -0700
Subject: [PATCH] Implement `SYS_gettid`.

Rust's libstd appears to be using `SYS_gettid` now.
---
 c-scape/src/syscall.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c-scape/src/syscall.rs b/c-scape/src/syscall.rs
index 52d4ddf..caa3f41 100644
--- a/c-scape/src/syscall.rs
+++ b/c-scape/src/syscall.rs
@@ -162,6 +162,9 @@ unsafe extern "C" fn syscall(number: c_long, mut args: ...) -> *mut c_void {
             let flags = args.arg::<c_int>();
             without_provenance_mut(libc::pipe2(pipefd, flags) as isize as usize)
         }
+        libc::SYS_gettid => {
+            without_provenance_mut(rustix::thread::gettid().as_raw_nonzero().get() as _)
+        }
         _ => unimplemented!(
             "syscall({:?}); maybe try enabling the \"extra-syscalls\" feature",
             number