diff --git a/lib/Sidef/Sys/Sys.pm b/lib/Sidef/Sys/Sys.pm
index 7a0f03ba6..a24faf91f 100644
--- a/lib/Sidef/Sys/Sys.pm
+++ b/lib/Sidef/Sys/Sys.pm
@@ -13,6 +13,16 @@ package Sidef::Sys::Sys {
         exit($code // 0);
     }
 
+    sub wait {
+        my ($self) = @_;
+        Sidef::Types::Number::Number->new(CORE::wait);
+    }
+
+    sub fork {
+        my ($self) = @_;
+        Sidef::Types::Number::Number->new(fork() // return);
+    }
+
     sub alarm {
         my ($self, $sec) = @_;
 
diff --git a/lib/Sidef/Types/Glob/FileHandle.pm b/lib/Sidef/Types/Glob/FileHandle.pm
index 9fc6ec527..796f3b44a 100644
--- a/lib/Sidef/Types/Glob/FileHandle.pm
+++ b/lib/Sidef/Types/Glob/FileHandle.pm
@@ -53,12 +53,12 @@ package Sidef::Types::Glob::FileHandle {
         CORE::binmode($self->{fh}, $encoding->get_value);
     }
 
-    sub write_string {
+    sub syswrite {
         my ($self, @args) = @_;
-        Sidef::Types::Bool::Bool->new(syswrite $self->{fh}, @args);
+        Sidef::Types::Bool::Bool->new(CORE::syswrite $self->{fh}, @args);
     }
 
-    *syswrite = \&write_string;
+    *write_string = \&syswrite;
 
     sub print {
         my ($self, @args) = @_;
diff --git a/lib/Sidef/Types/Glob/Socket.pm b/lib/Sidef/Types/Glob/Socket.pm
index 64267beaf..6ad987bb4 100644
--- a/lib/Sidef/Types/Glob/Socket.pm
+++ b/lib/Sidef/Types/Glob/Socket.pm
@@ -39,6 +39,15 @@ package Sidef::Types::Glob::Socket {
         Sidef::Types::Glob::SocketHandle->new(fh => $fh);
     }
 
+    sub socketpair {
+        my ($self, $socket1, $socket2, $domain, $type, $protocol) = @_;
+        CORE::socketpair(my $sh1, my $sh2, $domain->get_value, $type->get_value, $protocol->get_value)
+          || return Sidef::Types::Bool::Bool->false;
+        $socket1->get_var->set_value(Sidef::Types::Glob::SocketHandle->new(fh => $sh1));
+        $socket2->get_var->set_value(Sidef::Types::Glob::SocketHandle->new(fh => $sh2));
+        Sidef::Types::Bool::Bool->true;
+    }
+
     #
     ## gethost*
     #