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/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 2000-2007 The R Core Team.
*
* This program 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 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, a copy is available at
* http://www.r-project.org/Licenses/
*/
/*
For use by alternative front-ends and packages which need to share
the R event loop (on all platforms).
Not part of the API and subject to change without notice.
*/
#ifndef R_EXT_EVENTLOOP_H
#define R_EXT_EVENTLOOP_H
#ifndef NO_C_HEADERS
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h> /* for fd_set according to recent POSIX */
#endif
/* NOTE: Needed at least on FreeBSD so that fd_set is defined. */
# include <sys/types.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define XActivity 1
#define StdinActivity 2
typedef void (*InputHandlerProc)(void *userData);
typedef struct _InputHandler {
int activity;
int fileDescriptor;
InputHandlerProc handler;
struct _InputHandler *next;
/* Whether we should be listening to this file descriptor or not. */
int active;
/* Data that can be passed to the routine as its only argument.
This might be a user-level function or closure when we implement
a callback to R mechanism.
*/
void *userData;
} InputHandler;
extern InputHandler *initStdinHandler(void);
extern void consoleInputHandler(unsigned char *buf, int len);
extern InputHandler *addInputHandler(InputHandler *handlers, int fd, InputHandlerProc handler, int activity);
extern InputHandler *getInputHandler(InputHandler *handlers, int fd);
extern int removeInputHandler(InputHandler **handlers, InputHandler *it);
extern InputHandler *getSelectedHandler(InputHandler *handlers, fd_set *mask);
extern fd_set *R_checkActivity(int usec, int ignore_stdin);
extern fd_set *R_checkActivityEx(int usec, int ignore_stdin, void (*intr)(void));
extern void R_runHandlers(InputHandler *handlers, fd_set *mask);
extern int R_SelectEx(int n, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout,
void (*intr)(void));
#ifdef __SYSTEM__
#ifndef __cplusplus /* Would get duplicate conflicting symbols*/
InputHandler *R_InputHandlers;
#endif
#else
extern InputHandler *R_InputHandlers;
#endif
extern void (* R_PolledEvents)(void);
extern int R_wait_usec;
#ifdef __cplusplus
}
#endif
#endif /* R_EXT_EVENTLOOP_H */
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