diff --git a/os/src/syscall/mod.rs b/os/src/syscall/mod.rs
index 49281026..e7d7aae0 100644
--- a/os/src/syscall/mod.rs
+++ b/os/src/syscall/mod.rs
@@ -7,6 +7,8 @@ const SYSCALL_WRITE: usize = 64;
 const SYSCALL_EXIT: usize = 93;
 const SYSCALL_YIELD: usize = 124;
 const SYSCALL_KILL: usize = 129;
+const SYSCALL_SIGACTION: usize = 134;
+const SYSCALL_SIGPROCMASK: usize = 135;
 const SYSCALL_GET_TIME: usize = 169;
 const SYSCALL_GETPID: usize = 172;
 const SYSCALL_FORK: usize = 220;
@@ -30,6 +32,8 @@ pub fn syscall(syscall_id: usize, args: [usize; 3]) -> isize {
         SYSCALL_EXIT => sys_exit(args[0] as i32),
         SYSCALL_YIELD => sys_yield(),
         SYSCALL_KILL => sys_kill(args[0], args[1] as u32),
+        SYSCALL_SIGACTION => sys_sigation(args[0] as u32, args[1], args[2]),
+        SYSCALL_SIGPROCMASK => sys_sigprocmask(args[0] as u32),
         SYSCALL_GET_TIME => sys_get_time(),
         SYSCALL_GETPID => sys_getpid(),
         SYSCALL_FORK => sys_fork(),
diff --git a/os/src/syscall/process.rs b/os/src/syscall/process.rs
index ede51750..aa591785 100644
--- a/os/src/syscall/process.rs
+++ b/os/src/syscall/process.rs
@@ -121,3 +121,22 @@ pub fn sys_kill(pid: usize, signal: u32) -> isize {
         -1
     }
 }
+
+pub fn sys_sigprocmask(mask: u32) -> isize {
+    if let Some(task) = current_task() {
+        let mut inner = task.inner_exclusive_access();
+        let old_mask = inner.signal_mask;
+        if let Some(flag) = SignalFlags::from_bits(mask) {
+            inner.signal_mask = flag;
+            old_mask.bits() as isize
+        } else {
+            -1
+        }
+    } else {
+        -1
+    }
+}
+
+pub fn sys_sigation(_signal: u32, _action: usize, _old_action: usize) -> isize {
+    0
+}
diff --git a/os/src/task/task.rs b/os/src/task/task.rs
index f9e4a102..6db89537 100644
--- a/os/src/task/task.rs
+++ b/os/src/task/task.rs
@@ -30,7 +30,8 @@ pub struct TaskControlBlockInner {
     pub exit_code: i32,
     pub fd_table: Vec<Option<Arc<dyn File + Send + Sync>>>,
     pub signals: SignalFlags,
-    pub pending_signals: SignalFlags
+    pub pending_signals: SignalFlags,
+    pub signal_mask: SignalFlags
 }
 
 impl TaskControlBlockInner {
@@ -93,7 +94,8 @@ impl TaskControlBlock {
                         Some(Arc::new(Stdout)),
                     ],
                     signals: SignalFlags::empty(),
-                    pending_signals: SignalFlags::empty()
+                    pending_signals: SignalFlags::empty(),
+                    signal_mask: SignalFlags::empty()
                 })
             },
         };
@@ -196,7 +198,8 @@ impl TaskControlBlock {
                     exit_code: 0,
                     fd_table: new_fd_table,
                     signals: SignalFlags::empty(),
-                    pending_signals: SignalFlags::empty()
+                    pending_signals: SignalFlags::empty(),
+                    signal_mask: SignalFlags::empty()
                 })
             },
         });