Initial project import

tools/v/vlib/os/signal.js.v

@@ -0,0 +1,133 @@
+module os
+
+fn signal_str(signal Signal) string {
+	mut result := signal.str().to_upper()
+	result = 'SIG${result}'
+	return result
+}
+
+fn signal_from_str(str JS.String) Signal {
+	s := string(str)
+	return match s {
+		'SIGHUP' {
+			Signal.hup
+		}
+		'SIGINT' {
+			Signal.int
+		}
+		'SIGQUIT' {
+			Signal.quit
+		}
+		'SIGILL' {
+			Signal.ill
+		}
+		'SIGTRAP' {
+			Signal.trap
+		}
+		'SIGABRT' {
+			Signal.abrt
+		}
+		'SIGBUS' {
+			Signal.bus
+		}
+		'SIGFPE' {
+			Signal.fpe
+		}
+		'SIGKILL' {
+			Signal.kill
+		}
+		'SIGUSR1' {
+			Signal.usr1
+		}
+		'SIGSEGV' {
+			Signal.segv
+		}
+		'SIGUSR2' {
+			Signal.usr2
+		}
+		'SIGPIPE' {
+			Signal.pipe
+		}
+		'SIGALRM' {
+			Signal.alrm
+		}
+		'SIGTERM' {
+			Signal.term
+		}
+		'SIGSTKFLT' {
+			Signal.stkflt
+		}
+		'SIGCHLD' {
+			Signal.chld
+		}
+		'SIGCONT' {
+			Signal.cont
+		}
+		'SIGSTOP' {
+			Signal.stop
+		}
+		'SIGTSTP' {
+			Signal.tstp
+		}
+		'SIGTTIN' {
+			Signal.ttin
+		}
+		'SIGTTOU' {
+			Signal.ttou
+		}
+		'SIGURG' {
+			Signal.urg
+		}
+		'SIGXCPU' {
+			Signal.xcpu
+		}
+		'SIGXFSZ' {
+			Signal.xfsz
+		}
+		'SIGVTALRM' {
+			Signal.vtalrm
+		}
+		'SIGPROF' {
+			Signal.prof
+		}
+		'SIGWINCH' {
+			Signal.winch
+		}
+		'SIGPOLL' {
+			Signal.poll
+		}
+		'SIGPWR' {
+			Signal.pwr
+		}
+		'SIGSYS' {
+			Signal.sys
+		}
+		else {
+			panic('unknown signal: ${s}')
+		}
+	}
+}
+
+// signal will assign `handler` callback to be called when `signum` signal is received.
+//
+// # Behaviour on different backends:
+// - NodeJS: Will use `process.on` and add `handler` to the listeners list for `signum` to happen
+// - Browser: Will use `window.addEventListener` for handling signal
+//
+// TODO: Add signal events implementation for browser backend
+pub fn signal_opt(signum Signal, handler SignalHandler) !SignalHandler {
+	signame := signal_str(signum)
+	_ := signame
+	$if js_node {
+		#$process.on(signame.str,function (sig) { handler(os__signal_from_str(sig));});
+
+		return handler
+	} $else $if js_browser {
+		#let event = new CustomEvent(signame.str, {detail: signum});
+		#window.addEventListener(signame.str, function (e) { handler(e.detail); });
+
+		return handler
+	} $else {
+		return error('signal handlers are not supported on bare JS')
+	}
+}