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-rw-r--r--meap/meap-code/ch10/ch10-basic-handler/src/main.rs58
1 files changed, 58 insertions, 0 deletions
diff --git a/meap/meap-code/ch10/ch10-basic-handler/src/main.rs b/meap/meap-code/ch10/ch10-basic-handler/src/main.rs
new file mode 100644
index 0000000..a7ecb33
--- /dev/null
+++ b/meap/meap-code/ch10/ch10-basic-handler/src/main.rs
@@ -0,0 +1,58 @@
+#![cfg(not(windows))] // <1>
+
+extern crate libc;
+
+use std::mem;
+use std::time;
+use std::thread::{sleep};
+use libc::{SIGTERM, SIGALRM, SIGHUP, SIGQUIT};
+
+static mut SHUT_DOWN: bool = false;
+
+fn register_signal_handler() {
+ let fn_ptr: fn(i32) -> () = handle_signals; // <2>
+
+ unsafe {
+ let fn_ptr_as_usize: usize = mem::transmute(fn_ptr); // <3>
+ libc::signal(SIGTERM, fn_ptr_as_usize); // <4>
+ }
+}
+
+#[allow(dead_code)] // <5>
+fn handle_signals(sig: i32) {
+ register_signal_handler();
+
+ unsafe { // <6>
+ SHUT_DOWN = match sig { // <7>
+ SIGHUP => false, // <7>
+ SIGALRM => false, // <7>
+ SIGTERM => true, // <7>
+ SIGQUIT => true, // <7>
+ _ => false, // <7>
+ };
+ }
+}
+
+fn main() {
+
+ register_signal_handler();
+ let delay = time::Duration::from_secs(1);
+
+ for i in 1_usize.. { // <7>
+ unsafe { // <7>
+ if SHUT_DOWN {
+ println!(); // only print a newline character
+ return;
+ }
+ }
+
+ sleep(delay);
+ print!("{} ", i);
+
+ if i > 10 {
+ unsafe {
+ libc::raise(SIGTERM);
+ }
+ }
+ }
+} \ No newline at end of file