upgrade/include/signal.h

#define SIGHUP  1
#define SIGINT  2
#define SIGQUIT 3
#define SIGQIT  3
#define SIGILL  4
#define SIGTRAP 5
#define SIGIOT  6
#define SIGEMT  7
#define SIGFPE  8
#define SIGKILL 9
#define SIGBUS  10
#define SIGSEGV 11
#define SIGSYS  12
#define SIGPIPE 13
#define SIGALRM 14
#define SIGTERM 15

int     (*signal())();
#define SIG_DFL (int (*)())0
#define SIG_IGN (int (*)())1