SRI-NOSC/mh/signals.h
#define NSIG 20 /* # of Bell signals */
#define NHSIG 1 /* # of Harvard signals */
#define SIGHUP 1 /* hangup */
#define SIGINT 2 /* interrupt (^C) */
#define SIGQIT 3 /* quit (^B) */
#define SIGINS 4 /* illegal instruction */
#define SIGTRC 5 /* trace or breakpoint */
#define SIGIOT 6 /* iot */
#define SIGEMT 7 /* emt */
#define SIGFPT 8 /* floating exception */
#define SIGKIL 9 /* kill */
#define SIGBUS 10 /* bus error */
#define SIGSEG 11 /* segmentation violation */
#define SIGSYS 12 /* sys */
#define SIGPIPE 13 /* end of pipe */
#define SIGALA 14 /* alarm clock */
/* harvard signals */
#define SIGBRK (-1) /* break (break) */