syscalls: sigsuspend

kernel-src/sys/syscalls/sigsuspend.c

@@ -0,0 +1,26 @@
+#include <kernel/syscalls.h>
+#include <kernel/signal.h>
+#include <logging.h>
+
+syscallret_t syscall_sigsuspend(context_t *, sigset_t *umask) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	sigset_t mask;
+	sigset_t old;
+
+	ret.errno = usercopy_fromuser(&mask, umask, sizeof(sigset_t));
+	if (ret.errno)
+		return ret;
+
+	signal_changemask(_cpu()->thread, SIG_SETMASK, &mask, &old);
+
+	sched_preparesleep(true);
+	__assert(sched_yield() == SCHED_WAKEUP_REASON_INTERRUPTED);
+
+	signal_changemask(_cpu()->thread, SIG_SETMASK, &old, NULL);
+
+	ret.errno = EINTR;
+	return ret;
+}