fix(pty): provide statx for musl builds

src/lib.rs

@@ -1,6 +1,8 @@
 pub mod client;
 pub mod daemon;
 mod ghostty;
+#[cfg(all(target_os = "linux", target_env = "musl"))]
+mod musl;
 #[cfg(unix)]
 mod ownership;
 pub mod protocol;

src/musl.rs

@@ -0,0 +1,59 @@
+use std::ffi::{c_char, c_int, c_uint, c_void};
+
+/// Zig 0.16 assumes musl provides `statx` (added in musl 1.2.5), so libghostty
+/// references it, but Rust's self-contained musl is older. Forward to the raw
+/// syscall exactly as musl's own wrapper does.
+///
+/// # Safety
+///
+/// Same contract as `statx(2)`.
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn statx(
+    dirfd: c_int,
+    path: *const c_char,
+    flags: c_int,
+    mask: c_uint,
+    buffer: *mut c_void,
+) -> c_int {
+    // SAFETY: the caller upholds statx(2)'s pointer requirements.
+    unsafe { libc::syscall(libc::SYS_statx, dirfd, path, flags, mask, buffer) as c_int }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // From linux/stat.h; the libc crate does not expose it for musl.
+    const STATX_BASIC_STATS: c_uint = 0x7ff;
+
+    #[test]
+    fn statx_matches_the_syscall_contract() {
+        let mut buffer = [0u8; 256];
+        // SAFETY: both paths are NUL-terminated and the buffer exceeds struct statx.
+        unsafe {
+            let root = statx(
+                libc::AT_FDCWD,
+                c"/".as_ptr(),
+                0,
+                STATX_BASIC_STATS,
+                buffer.as_mut_ptr().cast(),
+            );
+            assert_eq!(root, 0);
+            let missing = c"/opencode-pty-missing".as_ptr();
+            assert_eq!(
+                statx(
+                    libc::AT_FDCWD,
+                    missing,
+                    0,
+                    STATX_BASIC_STATS,
+                    buffer.as_mut_ptr().cast()
+                ),
+                -1
+            );
+        }
+        assert_eq!(
+            std::io::Error::last_os_error().raw_os_error(),
+            Some(libc::ENOENT)
+        );
+    }
+}