http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/wvstreams/wvfdstream.h

/* -*- Mode: C++ -*- * Worldvisions Weaver Software: * Copyright (C) 1997-2002 Net Integration Technologies, Inc. * * Base class for streams built on Unix file descriptors. */ #ifndef __WVFDSTREAM_H #define __WVFDSTREAM_H #include "wvstream.h" /** * Base class for streams built on Unix file descriptors. * * WvFDStream distinguishes between read and write file descriptors * at creation time. Additionally, the reading and writing halves * may be independently shut down by calling noread() or nowrite(). * */ class WvFdStream : public WvStream { protected: /** The file descriptor for reading. */ int rfd; /** The file descriptor for writing. */ int wfd; /** Have we actually shut down the read/write sides? */ bool shutdown_read, shutdown_write; /** * Sets the file descriptor for both reading and writing. * Convenience method. */ void setfd(int fd) { rfd = wfd = fd; } public: /** * Creates a WvStream from an existing file descriptor. * "rwfd" is the file descriptor for reading and writing */ WvFdStream(int rwfd = -1); /** * Creates a WvStream from two existing file descriptors. * * The file decriptors may be the same. * * "rfd" is the file descriptor for reading * "wfd" is the file descriptor for writing */ WvFdStream(int rfd, int wfd); /** Destroys the stream and invokes close(). */ virtual ~WvFdStream(); /** * Returns the Unix file descriptor for reading from this stream. * Returns: the file descriptor, or -1 if none */ int getrfd() const { return rfd; } /** * Returns the Unix file descriptor for writing to this stream. * Returns: the file descriptor, or -1 if none */ int getwfd() const { return wfd; } /** * Returns the Unix file descriptor for reading and writing. * * Asserts that the file descriptors for reading and writing * are the same before returning. * * Returns: the file descriptor, or -1 if none */ int getfd() const { assert(rfd == wfd); return rfd; } /** Make the fds on this stream blocking or non-blocking. */ void set_nonblock(bool nonblock); /** Make the fds on this stream close-on-exec or not. */ void set_close_on_exec(bool close_on_exec); /***** Overridden members *****/ /** * Closes the file descriptors. * * If it is undesirable for the file descriptors to be closed by * this stream, duplicate the file descriptors using dup() before * creating the stream. * */ virtual void close(); virtual bool isok() const; virtual size_t uread(void *buf, size_t count); virtual size_t uwrite(const void *buf, size_t count); virtual bool pre_select(SelectInfo &si); virtual bool post_select(SelectInfo &si); virtual void maybe_autoclose(); }; typedef WvFdStream WvFDStream; #endif // __WVFDSTREAM_H