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#ifdef HAVE_SIGPROCMASK
# define SIGACTION sigaction
#else
/* Just enough backwards compatibility that we get by in the backends
without making handstands. */
# ifdef sigset_t
# undef sigset_t
# endif
# ifdef sigemptyset
# undef sigemptyset
# endif
# ifdef sigfillset
# undef sigfillset
# endif
# ifdef sigaddset
# undef sigaddset
# endif
# ifdef sigdelset
# undef sigdelset
# endif
# ifdef sigprocmask
# undef sigprocmask
# endif
# ifdef SIG_BLOCK
# undef SIG_BLOCK
# endif
# ifdef SIG_UNBLOCK
# undef SIG_UNBLOCK
# endif
# ifdef SIG_SETMASK
# undef SIG_SETMASK
# endif
# define sigset_t int
# define sigemptyset(set) do { *(set) = 0; } while (0)
# define sigfillset(set) do { *(set) = ~0; } while (0)
# define sigaddset(set,signal) do { *(set) |= sigmask (signal); } while (0)
# define sigdelset(set,signal) do { *(set) &= ~sigmask (signal); } while (0)
# define sigaction(sig,new,old) sigvec (sig,new,old)
/* Note: it's not safe to just declare our own "struct sigaction" since
some systems (e.g., some versions of OpenStep) declare that structure,
but do not implement sigprocmask(). Hard to believe, aint it? */
# define SIGACTION sigvec
# define SIG_BLOCK 1
# define SIG_UNBLOCK 2
# define SIG_SETMASK 3
#endif /* !HAVE_SIGPROCMASK */
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