fix(os_linux): call `ppoll` instead on `arm64`

core/os/os_linux.odin

@@ -440,9 +440,7 @@ pollfd :: struct {
 
 nfds_t :: distinct c.uint
 
-sigset_t :: struct {
-  __val: [16]c.ulong,
-}
+sigset_t :: distinct u64
 
 foreign libc {
 	@(link_name="__errno_location") __errno_location    :: proc() -> ^int ---

core/sys/unix/syscalls_linux.odin

@@ -2079,7 +2079,22 @@ sys_select :: proc "contextless" (nfds: int, readfds, writefds, exceptfds: rawpt
 }
 
 sys_poll :: proc "contextless" (fds: rawptr, nfds: uint, timeout: int) -> int {
-  return int(intrinsics.syscall(SYS_poll, uintptr(fds), uintptr(nfds), uintptr(timeout)))
+  // NOTE: specialcased here because `arm64` does not have `poll`
+	when ODIN_ARCH != .arm64 {
+    // redefined because we can't depend on the `unix` module here
+    timespec :: struct {
+      tv_sec: i64,
+      tv_nsec: i64,
+    }
+    seconds := i64(timeout / 1_000)
+    nanoseconds := i64((timeout % 1000) * 1_000_000)
+    timeout_spec := timespec{seconds, nanoseconds}
+
+		return int(intrinsics.syscall(SYS_ppoll, uintptr(fds), uintptr(nfds), uintptr(&timeout_spec), uintptr(0), uintptr(8)))
+	} else {
+    return int(intrinsics.syscall(SYS_poll, uintptr(fds), uintptr(nfds), uintptr(timeout)))
+	}
+  
 }
 
 sys_ppoll :: proc "contextless" (fds: rawptr, nfds: uint, timeout: rawptr, sigmask: rawptr, sigsetsize: uint) -> int {