initial signal implementation

kernel-src/sys/syscalls/sigprocmask.c

@@ -0,0 +1,32 @@
+#include <kernel/syscalls.h>
+#include <arch/cpu.h>
+
+#define SIG_BLOCK 0
+#define SIG_UNBLOCK 1
+#define SIG_SETMASK 2
+
+syscallret_t syscall_sigprocmask(context_t *, int how, sigset_t *set, sigset_t *oldset) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	sigset_t new, old;
+
+	if (set) {
+		if (how != SIG_BLOCK && how != SIG_UNBLOCK && how != SIG_SETMASK) {
+			ret.errno = EINVAL;
+			return ret;
+		}
+
+		new = *set;
+	}
+	
+	signal_changemask(_cpu()->thread, how, set ? &new : NULL, oldset ? &old : NULL);
+
+	if (oldset)
+		*oldset = old;
+
+	ret.ret = 0;
+	ret.errno = 0;
+	return ret;
+}