feature: added third_party TCC into userland

src/userland/sdk/include/signal.h

@@ -0,0 +1,37 @@
+#ifndef BOREDOS_LIBC_SIGNAL_H
+#define BOREDOS_LIBC_SIGNAL_H
+
+#include "sys/types.h"
+
+typedef void (*sighandler_t)(int);
+typedef unsigned long sigset_t;
+
+struct sigaction {
+	sighandler_t sa_handler;
+	sigset_t sa_mask;
+	int sa_flags;
+};
+
+#define SIG_DFL ((sighandler_t)0)
+#define SIG_IGN ((sighandler_t)1)
+#define SIG_ERR ((sighandler_t)-1)
+#define SIGKILL 9
+#define SIGTERM 15
+#define SIGINT 2
+
+#define SIG_BLOCK 0
+#define SIG_UNBLOCK 1
+#define SIG_SETMASK 2
+
+#define SA_RESTART 0x10000000
+#define SA_NODEFER 0x40000000
+#define SA_RESETHAND 0x80000000
+
+sighandler_t signal(int sig, sighandler_t handler);
+int sigaction(int sig, const struct sigaction *act, struct sigaction *oldact);
+int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
+int sigpending(sigset_t *set);
+int raise(int sig);
+int kill(pid_t pid, int sig);
+
+#endif