+#define _SIGSEGV 1
+#define _SIGALRM 2
+#define _SIGCHLD 3
+#define _SIGCLD _SIGCHLD
+#define _SIGINT 4
+#define _SIGKILL 5
+#define _SIGSTOP 6
+#define _SIGCONT 7
+#define _SIGTERM 8
+
+#define __SIGNAL(num) (1 << (num))
+#define __SIGSET(bitmap, num) (bitmap = bitmap | __SIGNAL(num))
+#define __SIGTEST(bitmap, num) (bitmap & __SIGNAL(num))
+#define __SIGCLEAR(bitmap, num) ((bitmap) = (bitmap) & ~__SIGNAL(num))