signum.h

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#define SIGHUP          1       /* Hangup (POSIX).  */    
#define SIGINT          2       /* Interrupt (ANSI).  */    
#define SIGQUIT         3       /* Quit (POSIX).  */    
#define SIGILL          4       /* Illegal instruction (ANSI).  */    
#define SIGTRAP         5       /* Trace trap (POSIX).  */    
#define SIGABRT         6       /* Abort (ANSI).  */    
#define SIGIOT          6       /* IOT trap (4.2 BSD).  */    
#define SIGBUS          7       /* BUS error (4.2 BSD).  */    
#define SIGFPE          8       /* Floating-point exception (ANSI). */    
#define SIGKILL         9       /* Kill, unblockable (POSIX).  */    
#define SIGUSR1         10      /* User-defined signal 1 (POSIX).  */    
#define SIGSEGV         11      /* Segmentation violation (ANSI).  */    
#define SIGUSR2         12      /* User-defined signal 2 (POSIX).  */    
#define SIGPIPE         13      /* Broken pipe (POSIX).  */    
#define SIGALRM         14      /* Alarm clock (POSIX).  */    
#define SIGTERM         15      /* Termination (ANSI).  */    
#define SIGSTKFLT       16          
#define SIGCLD          SIGCHLD /* Same as SIGCHLD (System V).  */    
#define SIGCHLD         17      /* Child status has changed (POSIX). */    
#define SIGCONT         18      /* Continue (POSIX).  */    
#define SIGSTOP         19      /* Stop, unblockable (POSIX).  */    
#define SIGTSTP         20      /* Keyboard stop (POSIX).  */    
#define SIGTTIN         21      /* Background read from tty (POSIX). */    
#define SIGTTOU         22      /* Background write to tty (POSIX). */    
#define SIGURG          23      /* Urgent condition on socket .  */    
#define SIGXCPU         24      /* CPU limit exceeded .  */    
#define SIGXFSZ         25      /* File size limit exceeded .  */    
#define SIGVTALRM       26      /* Virtual alarm clock .  */    
#define SIGPROF         27      /* Profiling alarm clock .   */    
#define SIGWINCH        28      /* Window size change.*/    
#define SIGPOLL         SIGIO   /* Pollable event occurred (System V).  */    
#define SIGIO           29      /* I/O now possible .  */    
#define SIGPWR          30      /* Power failure restart (System V).  */    
#define SIGUNUSED       31 

//Signal Operators         
int sigemptyset(sigset_t *set);         
int sigfillset(sigset_t *set);         
int sigaddset(sigset_t *set, int signum);         
int sigdelset(sigset_t *set, int signum);         
int sigismember(const sigset_t *set, int signum);    

//Signal Handling Functions         
int sigaction(int signum,  const  struct  sigaction  *act,struct sigaction *oldact);         
int  sigprocmask(int  how,  const  sigset_t *set, sigset_t *oldset);         
int sigpending(sigset_t *set);         
int sigsuspend(const sigset_t *mask);    

//Structure Signal Action    
struct sigaction {                     
	void (*sa_handler)(int);                     
	sigset_t sa_mask;                     
	int sa_flags;                     
	void (*sa_restorer)(void); 
	}