Patch add abort func (#120)

* 对于除了sigkill以外的信号，也加入队列

* bugfix:libc中，注册信号处理函数时，总是注册sigkill的问题

* 增加getpid系统调用

* 增加了raise、kill、abort

kernel/src/process/pid.rs

@@ -1,3 +1,5 @@
+use crate::{include::bindings::bindings::pt_regs, arch::x86_64::asm::current::current_pcb};
+
 #[allow(dead_code)]
 #[derive(Debug, Clone, Copy)]
 #[repr(u8)]
@@ -15,4 +17,12 @@ impl PartialEq for PidType {
     fn eq(&self, other: &PidType) -> bool {
         *self as u8 == *other as u8
     }
+}
+
+/**
+ * @brief 获取当前进程的pid
+ */
+#[no_mangle]
+pub extern "C" fn sys_getpid(_regs: &pt_regs)->u64{
+    return current_pcb().pid as u64;
 }