#if !defined (_SIG_H_)
# define _SIG_H_
#include "stdc.h"
#if !defined (SIGABRT) && defined (SIGIOT)
# define SIGABRT SIGIOT
#endif
#define sighandler RETSIGTYPE
typedef RETSIGTYPE SigHandler __P((int));
#if defined (VOID_SIGHANDLER)
# define SIGRETURN(n) return
#else
# define SIGRETURN(n) return(n)
#endif
#if !defined (HAVE_POSIX_SIGNALS)
# define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
#else
extern SigHandler *set_signal_handler __P((int, SigHandler *));
#endif
#if defined (JOB_CONTROL)
#if !defined (SIGCHLD) && defined (SIGCLD)
# define SIGCHLD SIGCLD
#endif
#if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
# define sigmask(x) (1 << ((x)-1))
#endif
#if !defined (HAVE_POSIX_SIGNALS)
# if !defined (SIG_BLOCK)
# define SIG_BLOCK 2
# define SIG_SETMASK 3
# endif
# define sigemptyset(set) (*(set) = 0)
# define sigfillset(set) (*set) = sigmask (NSIG) - 1
# define sigaddset(set, sig) *(set) |= sigmask (sig)
# define sigdelset(set, sig) *(set) &= ~sigmask (sig)
# define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
# define sigsuspend(set) sigpause (*(set))
#endif
#define BLOCK_SIGNAL(sig, nvar, ovar) \
do { \
sigemptyset (&nvar); \
sigaddset (&nvar, sig); \
sigemptyset (&ovar); \
sigprocmask (SIG_BLOCK, &nvar, &ovar); \
} while (0)
#if defined (HAVE_POSIX_SIGNALS)
# define BLOCK_CHILD(nvar, ovar) \
BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
# define UNBLOCK_CHILD(ovar) \
sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
#else
# define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
# define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif
#endif
extern sighandler termination_unwind_protect __P((int));
extern sighandler sigint_sighandler __P((int));
extern void initialize_signals __P((int));
extern void initialize_terminating_signals __P((void));
extern void reset_terminating_signals __P((void));
extern void throw_to_top_level __P((void));
extern void jump_to_top_level __P((int)) __attribute__((__noreturn__));
extern SigHandler *set_sigint_handler __P((void));
extern SigHandler *trap_to_sighandler __P((int));
extern sighandler trap_handler __P((int));
#endif