Fix stop signal by switching context after stopping

src/context/signal.rs

@@ -1,7 +1,7 @@
 use alloc::arc::Arc;
 use core::mem;
 
-use context::{contexts, Status};
+use context::{contexts, switch, Status};
 use start::usermode;
 use syscall;
 use syscall::flag::{SIG_DFL, SIG_IGN, SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU};
@@ -16,7 +16,6 @@ pub extern "C" fn signal_handler(sig: usize) {
     };
 
     let handler = action.sa_handler as usize;
-    println!("Handler {}: {:X}", sig, handler);
     if handler == SIG_DFL {
         match sig {
             SIGCHLD => {
@@ -71,6 +70,8 @@ pub extern "C" fn signal_handler(sig: usize) {
                         println!("{}: {} not found for stop", pid.into(), ppid.into());
                     }
                 }
+
+                unsafe { switch() };
             },
             _ => {
                 println!("Exit {}", sig);

src/syscall/process.rs

@@ -986,13 +986,13 @@ pub fn kill(pid: ContextId, sig: usize) -> Result<usize> {
                 || euid == context.ruid
                 || ruid == context.ruid
                 {
+                    context.pending.push_back(sig as u8);
                     // Convert stopped processes to blocked if sending SIGCONT
                     if sig == SIGCONT {
                         if let context::Status::Stopped(_sig) = context.status {
                             context.status = context::Status::Blocked;
                         }
                     }
-                    context.pending.push_back(sig as u8);
                     true
                 } else {
                     false