feat: alarm系统调用实现 (#710)

* alarm系统调用实现

user/apps/test_alarm/.cargo/config.toml

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+[build]
+target = "x86_64-unknown-linux-musl"

user/apps/test_alarm/.gitignore

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+/target
+Cargo.lock
+/install/

user/apps/test_alarm/Cargo.toml

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+[package]
+name = "test_alarm"
+version = "0.1.0"
+edition = "2021"
+description = "test for alarm"
+authors = [ "smallc <2628035541@qq.com>" ]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2.0"
+nix = "0.23.0"

user/apps/test_alarm/Makefile

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+TOOLCHAIN="+nightly-2023-08-15-x86_64-unknown-linux-gnu"
+RUSTFLAGS+=""
+
+ifdef DADK_CURRENT_BUILD_DIR
+# 如果是在dadk中编译，那么安装到dadk的安装目录中
+	INSTALL_DIR = $(DADK_CURRENT_BUILD_DIR)
+else
+# 如果是在本地编译，那么安装到当前目录下的install目录中
+	INSTALL_DIR = ./install
+endif
+
+ifeq ($(ARCH), x86_64)
+	export RUST_TARGET=x86_64-unknown-linux-musl
+else ifeq ($(ARCH), riscv64)
+	export RUST_TARGET=riscv64gc-unknown-linux-gnu
+else 
+# 默认为x86_86，用于本地编译
+	export RUST_TARGET=x86_64-unknown-linux-musl
+endif
+
+run:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run --target $(RUST_TARGET)
+
+build:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build --target $(RUST_TARGET)
+
+clean:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean --target $(RUST_TARGET)
+
+test:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test --target $(RUST_TARGET)
+
+doc:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) doc --target $(RUST_TARGET)
+
+fmt:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) fmt
+
+fmt-check:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) fmt --check
+
+run-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) run --target $(RUST_TARGET) --release
+
+build-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) build --target $(RUST_TARGET) --release
+
+clean-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) clean --target $(RUST_TARGET) --release
+
+test-release:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) test --target $(RUST_TARGET) --release
+
+.PHONY: install
+install:
+	RUSTFLAGS=$(RUSTFLAGS) cargo $(TOOLCHAIN) install --target $(RUST_TARGET) --path . --no-track --root $(INSTALL_DIR) --force

user/apps/test_alarm/README.md

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+# sysalarm调用测试
+## 测试流程
+首先测试能否正常启用sysalarm系统调用，然后测试在上一个alarm未结束时调用alarm能否取消上一个，返回剩余时间，启动下一个alarm
+

user/apps/test_alarm/src/main.rs

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+extern crate libc;
+use libc::{signal, sleep, syscall, SYS_alarm, SIGALRM};
+
+extern "C" fn handle_alarm(_: i32) {
+    println!("Alarm ring!");
+}
+
+fn main() {
+    // 设置信号处理函数
+    unsafe {
+        signal(SIGALRM, handle_alarm as usize);
+    }
+
+    //test1: alarm系统调用能否正常运行
+    unsafe {
+        syscall(SYS_alarm, 5);
+    }
+    println!("Alarm set for 5 seconds");
+    unsafe {
+        sleep(6);
+    }
+    println!("Test 1 complete");
+
+    //test2：在上一个alarm定时器未完成时重新调用alarm，查看返回值是否为上一个alarm的剩余秒数，
+    //并test第三个alarm定时器能否正常运行
+
+    unsafe {
+        let remaining = syscall(SYS_alarm, 5);
+        println!("Remaining time for previous alarm: {}", remaining);
+    }
+    println!("Alarm set for 5 seconds");
+    unsafe {
+        let remaining = syscall(SYS_alarm, 3);
+        println!("Remaining time for previous alarm: {}", remaining);
+    }
+    unsafe {
+        sleep(4);
+    }
+    println!("Alarm set for 3 seconds");
+
+    println!("Test 2 complete");
+}