#ifdef POSIX_SIGNALS
#define SIGMASKTYPE sigset_t
#define SIGEMPTYMASK (empty_mask)
#define SIGFULLMASK (full_mask)
extern sigset_t empty_mask, full_mask;
extern void init_signals P_ ((void));
#undef sigmask
#ifdef __GNUC__
#define sigmask(SIG) \
({ \
sigset_t _mask; \
sigemptyset (&_mask); \
sigaddset (&_mask, SIG); \
_mask; \
})
#else
extern sigset_t sys_sigmask ();
#define sigmask(SIG) (sys_sigmask (SIG))
#endif
#undef sigpause
#define sigpause(MASK) sigsuspend (&(MASK))
#define sigblock(SIG) sys_sigblock (SIG)
#define sigunblock(SIG) sys_sigunblock (SIG)
#ifndef sigsetmask
#define sigsetmask(SIG) sys_sigsetmask (SIG)
#endif
#define sighold(SIG) ONLY_USED_IN_BSD_4_1
#define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
#undef signal
#define signal(SIG,ACT) sys_signal(SIG,ACT)
typedef RETSIGTYPE (*signal_handler_t) ();
signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
sigset_t sys_sigblock P_ ((sigset_t new_mask));
sigset_t sys_sigunblock P_ ((sigset_t new_mask));
sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
#define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
#else
#ifdef USG5_4
#ifndef sigblock
#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
#endif
#define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
#else
#ifdef USG
#define sigunblock(sig)
#else
#define sigunblock(SIG) \
{ SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
#endif
#endif
#endif
#ifndef SIGMASKTYPE
#define SIGMASKTYPE int
#endif
#ifndef SIGEMPTYMASK
#define SIGEMPTYMASK (0)
#endif
#ifndef SIGFULLMASK
#define SIGFULLMASK (0xffffffff)
#endif
#ifndef sigmask
#define sigmask(no) (1L << ((no) - 1))
#endif
#ifndef sigunblock
#define sigunblock(SIG) \
{ SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
#endif
#ifndef BSD4_1
#define sigfree() sigsetmask (SIGEMPTYMASK)
#endif
#ifdef BSD4_1
#define SIGIO SIGTINT
#endif
#ifdef BSD_SYSTEM
#define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
#else
#ifdef WINDOWSNT
#define EMACS_KILLPG(gid, signo) (kill (gid, signo))
#else
#define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
#endif
#endif
#ifndef VMS
#ifdef SIGCLD
#ifndef SIGCHLD
#define SIGCHLD SIGCLD
#endif
#endif
#endif