The signal.h header file exists The signal.h header defines the symbols SIG_DFL, SIG_ERR, SIG_HOLD and SIG_IGN as 'void (*) int'. The signal.h header defines sig_atomic_t. The signal.h header defines sigset_t. The sys/types.h header defines pid_t. The signal.h header defines a structure named sigevent which has at least: int sigev_notify int sigev_signo union sigval sigev_value void(*)(union sigval) sigev_notify_function (pthread_attr_t *) sigev_notify_attributes For sigev_notify (assertion 6), the following values are defined: SIGEV_NONE SIGEV_SIGNAL SIGEV_THREAD The sigval union (assertion 6) is defined as: int sival_int void *sival_ptr The signal.h header declares SIGRTMIN and SIGRTMAX. These are macros that evaluate to integer expressions for the minimum and maximum signal numbers reserved for realtime signals. The range SIGRTMIN-SIGRTMAX doesn't overlap pre-defined signals (see below). The SIGRTMIN-SIGRTMAX range includes at least {RTSIG_MAX} signal numbers. Realtime signal behavior may or may not be supported for non-realtime signals. This is defined by the implementation. The value 0 is not used in any signals, but is reserved as the null signal. The following signals are always (on all implementations) supported: SIGABRT SIGALRM SIGBUS SIGCHLD SIGCONT SIGFPE SIGHUP SIGILL SIGINT SIGKILL SIGPIPE SIGQUIT SIGSEGV SIGSTOP SIGTERM SIGTSTP SIGTTIN SIGTTOU SIGUSR1 SIGUSR2 SIGPOLL SIGPROF SIGSYS SIGTRAP SIGURG SIGVTALRM SIGXCPU SIGXFSZ The signal.h header declares the struct sigaction which has, at a minimum, the following members: void (*sa_handler)(int) sigset_t sa_mask int sa_flags void (*)(int, siginfo_t *, void *) sa_sigaction The constants below are declared: SA_NOCLDSTOP SIG_BLOCK SIG_UNBLOCK SIG_SETMASK SA_ONSTACK SA_RESETHAND SA_RESTART SA_SIGINFO SA_NOCLDWAIT SA_NODEFER SS_ONSTACK SS_DISABLE MINSIGSTKSZ SIGSTKSZ The ucontext.h header shall define ucontext_t. The ucontext.h header shall define mcontext_t. The signal.h header defines the structure stack_t which includes the following, at a minimum: void *ss_sp size_t ss_size int ss_flags The signal.h header defines the structure sigstack which includes the following, at a minimum: int ss_onstack void *ss_sp The signal.h header defines the structure siginfo_t which includes the following, at a minimum: int si_signo int si_errno int si_code pid_t si_pid uid_t si_uid void *si_addr int si_status long si_band union sigval si_value The following macros are defined: ILL_ILLOPC ILL_ILLOPN ILL_ILLADR ILL_ILLTRP ILL_PRVOPC ILL_PRVREG ILL_COPROC ILL_BADSTK FPE_INTDIV FPE_INTOVF FPE_FLTDIV FPE_FLTOVF FPE_FLTUND FPE_FLTRES FPE_FLTINV FPE_FLTSUB SEGV_MAPERR SEGV_ACCERR BUS_ADRALN BUS_ADRERR BUS_OBJERR TRAP_BRKPT TRAP_TRACE CLD_EXITED CLD_KILLED CLD_DUMPED CLD_TRAPPED CLD_STOPPED CLD_CONTINUED POLL_IN POLL_OUT POLL_MSG POLL_ERR POLL_PRI POLL_HUP SI_USER SI_QUEUE SI_TIMER SI_ASYNCIO SI_MESGQ The function below is declared: void (*bsd_signal(int, void (*)(int)))(int); The function below is declared: int kill(pid_t, int); The function below is declared: int killpg(pid_t, int); The function below is declared: int pthread_kill(pthread_t, int); The function below is declared: int pthread_sigmask(int, const sigset_t *, sigset_t *); The function below is declared: int raise(int); The function below is declared: int sigaction(int, const struct sigaction *restrict, struct sigaction *restrict); The function below is declared: int sigaddset(sigset_t *, int); The function below is declared: int sigaltstack(const stack_t *restrict, stack_t *restrict); The function below is declared: int sigdelset(sigset_t *, int); The function below is declared: int sigemptyset(sigset_t *); The function below is declared: int sigfillset(sigset_t *); The function below is declared: int sighold(int); The function below is declared: int sigignore(int); The function below is declared: int siginterrupt(int, int); The function below is declared: int sigismember(const sigset_t *, int); The function below is declared: void (*signal(int, void (*)(int)))(int); The function below is declared: int sigpause(int); The function below is declared: int sigpending(sigset_t *); The function below is declared: int sigprocmask(int, const sigset_t *restrict, sigset_t *restrict); The function below is declared: int sigqueue(pid_t, int, const union sigval); The function below is declared: int sigrelse(int); The function below is declared: void (*sigset(int, void (*)(int)))(int); The function below is declared: int sigsuspend(const sigset_t *); The function below is declared: int sigtimedwait(const sigset_t *restrict, siginfo_t *restrict, const struct timespec *restrict); The function below is declared: int sigwait(const sigset_t *restrict, int *restrict); The function below is declared: int sigwaitinfo(const sigset_t *restrict, siginfo_t *restrict); Inclusion of the signal.h header may make visible all symbols from the time.h header.