diff --git a/src/libos/src/error/mod.rs b/src/libos/src/error/mod.rs
index 14bc33ab..e01eff8c 100644
--- a/src/libos/src/error/mod.rs
+++ b/src/libos/src/error/mod.rs
@@ -51,3 +51,20 @@ macro_rules! try_libc {
         ret
     }};
 }
+
+// return Err(errno) if libc return -1
+// raise SIGPIPE if errno == EPIPE
+macro_rules! try_libc_may_epipe {
+    ($ret: expr) => {{
+        let ret = unsafe { $ret };
+        if ret < 0 {
+            let errno = unsafe { libc::errno() };
+            if errno == Errno::EPIPE as i32 {
+                // SIGPIPE = 12
+                crate::signal::do_tkill(current!().tid(), 12);
+            }
+            return_errno!(Errno::from(errno as u32), "libc error");
+        }
+        ret
+    }};
+}
diff --git a/src/libos/src/net/socket_file/mod.rs b/src/libos/src/net/socket_file/mod.rs
index 88721761..243e8d77 100644
--- a/src/libos/src/net/socket_file/mod.rs
+++ b/src/libos/src/net/socket_file/mod.rs
@@ -59,7 +59,7 @@ impl File for SocketFile {
 
     fn write(&self, buf: &[u8]) -> Result<usize> {
         let (buf_ptr, buf_len) = buf.as_ptr_and_len();
-        let ret = try_libc!(libc::ocall::write(
+        let ret = try_libc_may_epipe!(libc::ocall::write(
             self.host_fd,
             buf_ptr as *const c_void,
             buf_len
diff --git a/src/libos/src/net/socket_file/send.rs b/src/libos/src/net/socket_file/send.rs
index 7d5d98d3..d3594633 100644
--- a/src/libos/src/net/socket_file/send.rs
+++ b/src/libos/src/net/socket_file/send.rs
@@ -56,10 +56,10 @@ impl SocketFile {
         let (msg_control, msg_controllen) = control.as_ptr_and_len();
         let msg_control = msg_control as *const c_void;
         // Flags
-        let flags = flags.bits();
+        let raw_flags = flags.bits();
 
-        let bytes_sent = try_libc!({
-            // Do OCall
+        // Do OCall
+        unsafe {
             let status = occlum_ocall_sendmsg(
                 &mut retval as *mut isize,
                 host_fd,
@@ -69,12 +69,17 @@ impl SocketFile {
                 msg_iovlen,
                 msg_control,
                 msg_controllen,
-                flags,
+                raw_flags,
             );
             assert!(status == sgx_status_t::SGX_SUCCESS);
+        }
+
+        let bytes_sent = if flags.contains(SendFlags::MSG_NOSIGNAL) {
+            try_libc!(retval)
+        } else {
+            try_libc_may_epipe!(retval)
+        };
 
-            retval
-        });
         debug_assert!(bytes_sent >= 0);
         Ok(bytes_sent as usize)
     }
diff --git a/src/libos/src/net/syscalls.rs b/src/libos/src/net/syscalls.rs
index fa91e513..94ecdeeb 100644
--- a/src/libos/src/net/syscalls.rs
+++ b/src/libos/src/net/syscalls.rs
@@ -286,7 +286,7 @@ pub fn do_sendto(
     let file_ref = current!().file(fd as FileDesc)?;
     if let Ok(socket) = file_ref.as_socket() {
         // TODO: check addr and addr_len according to connection mode
-        let ret = try_libc!(libc::ocall::sendto(
+        let ret = try_libc_may_epipe!(libc::ocall::sendto(
             socket.fd(),
             base,
             len,
diff --git a/src/pal/src/pal_api.c b/src/pal/src/pal_api.c
index d10ea308..1d043571 100644
--- a/src/pal/src/pal_api.c
+++ b/src/pal/src/pal_api.c
@@ -36,12 +36,10 @@ int occlum_pal_init(const struct occlum_pal_attr *attr) {
         errno = EEXIST;
         return -1;
     }
-// FIXME
-#ifndef SGX_MODE_SIM
+
     if (pal_register_sig_handlers() < 0) {
         return -1;
     }
-#endif
 
     if (pal_init_enclave(resolved_path) < 0) {
         return -1;
diff --git a/src/pal/src/pal_sig_handler.c b/src/pal/src/pal_sig_handler.c
index 995c6b37..108236fd 100644
--- a/src/pal/src/pal_sig_handler.c
+++ b/src/pal/src/pal_sig_handler.c
@@ -7,12 +7,16 @@
 #define SIGRT_INTERRUPT     64
 
 int pal_register_sig_handlers(void) {
-    struct sigaction action;
-    action.sa_handler = SIG_IGN;
-    memset(&action.sa_mask, 0, sizeof(action.sa_mask));
-    action.sa_flags = 0;
-    if (sigaction(SIGRT_INTERRUPT, &action, NULL) < 0) {
-        PAL_ERROR("Failed to regiter signal handlers");
+    // FIXME: enable interruptable signal in SIM mode
+#ifndef SGX_MODE_SIM
+    if (signal(SIGRT_INTERRUPT, SIG_IGN) == SIG_ERR) {
+        PAL_ERROR("Failed to regiter the SIG64 handler");
+        return -1;
+    }
+#endif
+
+    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
+        PAL_ERROR("Failed to regiter the SIGPIPE handler");
         return -1;
     }
     return 0;