Initial project import

tools/v/vlib/os/signal_linux.c.v

@@ -0,0 +1,35 @@
+@[has_globals]
+module os
+
+#flag -lpthread
+#include <signal.h>
+
+fn C.pthread_self() usize
+
+// g_main_thread_id and is_main_thread can be used to determine if the current thread is the main thread.
+// if need to get the tid of the main thread, can use the global variable g_main_thread_id
+// instead of using thread_id() every time.
+__global g_main_thread_id = u64(C.pthread_self())
+
+// is_main_thread returns whether the current thread is the main thread.
+pub fn is_main_thread() bool {
+	return g_main_thread_id == u64(C.pthread_self())
+}
+
+@[typedef]
+struct C.sigset_t {}
+
+fn C.sigaddset(set &C.sigset_t, signum i32) i32
+fn C.sigemptyset(set &C.sigset_t)
+fn C.sigprocmask(how i32, set &C.sigset_t, oldset &C.sigset_t) i32
+
+fn signal_ignore_internal(args ...Signal) {
+	$if !android && !macos && !openbsd {
+		mask1 := C.sigset_t{}
+		C.sigemptyset(&mask1)
+		for arg in args {
+			C.sigaddset(&mask1, int(arg))
+		}
+		C.sigprocmask(C.SIG_BLOCK, &mask1, unsafe { nil })
+	}
+}