PLearn 0.1
FdPStreamBuf.cc
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00001 // -*- C++ -*-
00002 
00003 // FdPStreamBuf.cc
00004 //
00005 // Copyright (C) 2004 Pascal Vincent 
00006 // 
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 // 
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 // 
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 // 
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 // 
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 /* *******************************************************      
00036  * $Id: FdPStreamBuf.cc 6066 2006-07-17 20:35:56Z tihocan $ 
00037  ******************************************************* */
00038 
00039 // Authors: Pascal Vincent
00040 
00043 #include "FdPStreamBuf.h"
00044 
00045 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(_MINGW_)
00046 // Dummy implementation to prevent compilation and link errors, as the "normal"
00047 // code does not compiler under Windows.
00048 
00049 namespace PLearn {
00050 
00051 FdPStreamBuf::FdPStreamBuf(int in_fd, int out_fd,
00052                                                    bool own_in_, bool own_out_):
00053         PStreamBuf(true, false)
00054 {
00055         PLERROR("The FdPStreamBuf class cannot be used on this system");
00056 }
00057 
00058 FdPStreamBuf::~FdPStreamBuf() {}
00059 
00060 FdPStreamBuf::streamsize FdPStreamBuf::read_(char* p, streamsize n)
00061 {
00062         return 0;
00063 }
00064 
00065 void FdPStreamBuf::write_(const char* p, streamsize n) {}
00066 
00067 }
00068 
00069 #else // POSIX
00070 
00071 #include <unistd.h>
00072 
00073 namespace PLearn {
00074 using namespace std;
00075 
00076 FdPStreamBuf::FdPStreamBuf(int in_fd, int out_fd,
00077                            bool own_in_, bool own_out_)
00078     :PStreamBuf(in_fd>=0, out_fd>=0, 4096, 4096, default_ungetsize), 
00079      in(in_fd), out(out_fd), own_in(own_in_), own_out(own_out_)
00080 {}
00081 
00082 FdPStreamBuf::~FdPStreamBuf()
00083 {
00084     const bool in_and_out_equal = (in == out);
00085 
00086     flush();
00087     if(in>=0 && own_in)
00088     {
00089         ::close(in);
00090         in = -1;
00091     }
00092     if(out>=0 && own_out)
00093     {
00094         if (!in_and_out_equal)
00095             ::close(out);
00096         out = -1;
00097     }
00098 }
00099 
00100 FdPStreamBuf::streamsize FdPStreamBuf::read_(char* p, streamsize n)
00101 {
00102     return ::read(in, p, n);
00103 }
00104 
00106 void FdPStreamBuf::write_(const char* p, streamsize n)
00107 {
00108     streamsize nwritten = ::write(out, p, n);
00109     if(nwritten!=n)
00110         PLERROR("In FdPStreamBuf::write_ failed to write the requested number of bytes");
00111 #ifdef _MINGW_
00112     PLERROR("In FdPStreamBuf::write_ - The 'fsync' function is not defined "
00113             "under MinGW (see code)");
00114 #else
00115     fsync(out);
00116 #endif
00117 }
00118   
00119 } // end of namespace PLearn
00120 
00121 #endif // WIN32 vs POSIX
00122 
00123 
00124 /*
00125   Local Variables:
00126   mode:c++
00127   c-basic-offset:4
00128   c-file-style:"stroustrup"
00129   c-file-offsets:((innamespace . 0)(inline-open . 0))
00130   indent-tabs-mode:nil
00131   fill-column:79
00132   End:
00133 */
00134 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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