static sexp sexp_set_signal_action (sexp ctx, sexp self, sexp signum, sexp newaction) {
int res;
sexp oldaction;
if (! (sexp_fixnump(signum) && sexp_unbox_fixnum(signum) > 0
&& sexp_unbox_fixnum(signum) < SEXP_MAX_SIGNUM))
return sexp_xtype_exception(ctx, self, "not a valid signal number", signum);
if (! (sexp_procedurep(newaction) || sexp_opcodep(newaction)
|| sexp_booleanp(newaction)))
return sexp_type_exception(ctx, self, SEXP_PROCEDURE, newaction);
if (! sexp_vectorp(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS)))
sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS)
= sexp_make_vector(ctx, sexp_make_fixnum(SEXP_MAX_SIGNUM), SEXP_FALSE);
oldaction = sexp_vector_ref(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS), signum);
res = sigaction(sexp_unbox_fixnum(signum),
(sexp_booleanp(newaction) ?
(sexp_truep(newaction) ? &call_sigdefault : &call_sigignore)
: &call_sigaction),
NULL);
if (res)
return sexp_user_exception(ctx, self, "couldn't set signal", signum);
sexp_vector_set(sexp_global(ctx, SEXP_G_SIGNAL_HANDLERS), signum, newaction);
sexp_signal_contexts[sexp_unbox_fixnum(signum)] = ctx;
return oldaction;
}
static sexp sexp_type_of (sexp ctx, sexp self, sexp_sint_t n, sexp x) {
if (sexp_pointerp(x))
return sexp_object_type(ctx, x);
else if (sexp_fixnump(x))
return sexp_type_by_index(ctx, SEXP_FIXNUM);
else if (sexp_booleanp(x))
return sexp_type_by_index(ctx, SEXP_BOOLEAN);
else if (sexp_charp(x))
return sexp_type_by_index(ctx, SEXP_CHAR);
#if SEXP_USE_HUFF_SYMS
else if (sexp_symbolp(x))
return sexp_type_by_index(ctx, SEXP_SYMBOL);
#endif
#if SEXP_USE_IMMEDIATE_FLONUMS
else if (sexp_flonump(x))
return sexp_type_by_index(ctx, SEXP_FLONUM);
#endif
else
return sexp_type_by_index(ctx, SEXP_OBJECT);
}
