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-rw-r--r--libguile/chooks.h79
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diff --git a/libguile/chooks.h b/libguile/chooks.h
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+/* classes: h_files */
+
+#ifndef SCM_CHOOKS_H
+#define SCM_CHOOKS_H
+
+/* Copyright (C) 1995-1996,1999,2000-2001,2006,2008-2009,2018
+ * Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+
+#include "libguile/__scm.h"
+
+/*
+ * C level hooks
+ */
+
+/*
+ * The interface is designed for and- and or-type hooks which
+ * both may want to indicate success/failure and return a result.
+ */
+
+typedef enum scm_t_c_hook_type {
+ SCM_C_HOOK_NORMAL,
+ SCM_C_HOOK_OR,
+ SCM_C_HOOK_AND
+} scm_t_c_hook_type;
+
+typedef void *(*scm_t_c_hook_function) (void *hook_data,
+ void *fn_data,
+ void *data);
+
+typedef struct scm_t_c_hook_entry {
+ struct scm_t_c_hook_entry *next;
+ scm_t_c_hook_function func;
+ void *data;
+} scm_t_c_hook_entry;
+
+typedef struct scm_t_c_hook {
+ scm_t_c_hook_entry *first;
+ scm_t_c_hook_type type;
+ void *data;
+} scm_t_c_hook;
+
+SCM_API void scm_c_hook_init (scm_t_c_hook *hook,
+ void *hook_data,
+ scm_t_c_hook_type type);
+SCM_API void scm_c_hook_add (scm_t_c_hook *hook,
+ scm_t_c_hook_function func,
+ void *fn_data,
+ int appendp);
+SCM_API void scm_c_hook_remove (scm_t_c_hook *hook,
+ scm_t_c_hook_function func,
+ void *fn_data);
+SCM_API void *scm_c_hook_run (scm_t_c_hook *hook, void *data);
+
+
+#endif /* SCM_CHOOKS_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/