Pass si_pid to all realtime signals.

src/platform/mod.rs

@@ -283,15 +283,17 @@ pub fn get_auxv(auxvs: &[[usize; 2]], key: usize) -> Option<usize> {
 
 #[cold]
 #[cfg(target_os = "redox")]
-pub fn init(auxvs: Box<[[usize; 2]]>) {
+// SAFETY: Must only be called when only one thread exists.
+pub unsafe fn init(auxvs: Box<[[usize; 2]]>) {
+    redox_rt::initialize();
+
     use self::auxv_defs::*;
 
     if let (Some(cwd_ptr), Some(cwd_len)) = (
         get_auxv(&auxvs, AT_REDOX_INITIAL_CWD_PTR),
         get_auxv(&auxvs, AT_REDOX_INITIAL_CWD_LEN),
     ) {
-        let cwd_bytes: &'static [u8] =
-            unsafe { core::slice::from_raw_parts(cwd_ptr as *const u8, cwd_len) };
+        let cwd_bytes: &'static [u8] = core::slice::from_raw_parts(cwd_ptr as *const u8, cwd_len);
         if let Ok(cwd) = core::str::from_utf8(cwd_bytes) {
             self::sys::path::set_cwd_manual(cwd.into());
         }

src/platform/redox/mod.rs

@@ -470,7 +470,7 @@ impl Pal for Sys {
     }
 
     fn getpid() -> pid_t {
-        e(syscall::getpid()) as pid_t
+        redox_rt::sys::posix_getpid() as pid_t
     }
 
     fn getppid() -> pid_t {

src/platform/redox/signal.rs

@@ -39,6 +39,7 @@ pub struct ucontext_t {
 }
 
 const _: () = {
+    #[track_caller]
     const fn assert_eq(a: usize, b: usize) {
         if a != b {
             panic!("compile-time struct verification failed");