source: vscpl/src/hu/varadiistvan/scpl/io/_posix/BufferedStream.cc@ 21:22a8774452ac

Last change on this file since 21:22a8774452ac was 6:53519b47b166, checked in by István Váradi <ivaradi@…>, 12 years ago

Imported some further stuff from the IO code

File size: 3.8 KB
Line 
1// Copyright (c) 2013 by István Váradi
2
3// This file is part of VSCPL, a simple cross-platform utility library
4
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7
8// 1. Redistributions of source code must retain the above copyright notice, this
9// list of conditions and the following disclaimer.
10// 2. Redistributions in binary form must reproduce the above copyright notice,
11// this list of conditions and the following disclaimer in the documentation
12// and/or other materials provided with the distribution.
13
14// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
18// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25// The views and conclusions contained in the software and documentation are those
26// of the authors and should not be interpreted as representing official policies,
27// either expressed or implied, of the FreeBSD Project.
28
29//------------------------------------------------------------------------------
30
31#include "BufferedStream.h"
32
33#include "ReadingBuffer.h"
34#include "WritingBuffer.h"
35
36#include <unistd.h>
37#include <poll.h>
38
39//------------------------------------------------------------------------------
40
41using hu::varadiistvan::scpl::io::BufferedStream;
42
43//------------------------------------------------------------------------------
44
45BufferedStream::BufferedStream(Waiter* waiter, int fd,
46 size_t readingCapacity,
47 size_t writingCapacity,
48 short events) :
49 Waitable(waiter, fd, events),
50 readingBuffer( (readingCapacity==0) ? 0 :
51 new ReadingBuffer(readingCapacity, this)),
52 writingBuffer( (writingCapacity==0) ? 0 :
53 new WritingBuffer(writingCapacity, this))
54{
55}
56
57//------------------------------------------------------------------------------
58
59BufferedStream::~BufferedStream()
60{
61 delete writingBuffer;
62 delete readingBuffer;
63}
64
65//------------------------------------------------------------------------------
66
67ssize_t BufferedStream::read(void* dest, size_t length)
68{
69 ssize_t result = ::read(fd, dest, length);
70 if (result<0 && errno!=EAGAIN && errno!=EWOULDBLOCK) {
71 setErrorCodeFromErrno();
72 }
73 return result;
74}
75
76//------------------------------------------------------------------------------
77
78ssize_t BufferedStream::write(const void* src, size_t length)
79{
80 ssize_t result = ::write(fd, src, length);
81 if (result<0 && errno!=EAGAIN && errno!=EWOULDBLOCK) {
82 setErrorCodeFromErrno();
83 }
84 return result;
85}
86
87//------------------------------------------------------------------------------
88
89bool BufferedStream::isReady()
90{
91 return false;
92}
93
94//------------------------------------------------------------------------------
95
96void BufferedStream::handleEvents(short ev)
97{
98 if ((ev&POLLIN)==POLLIN && readingBuffer!=0) {
99 readingBuffer->read();
100 }
101 if ((ev&POLLOUT)==POLLOUT && writingBuffer!=0) {
102 writingBuffer->write();
103 }
104}
105
106//------------------------------------------------------------------------------
107
108// Local Variables:
109// mode: C++
110// c-basic-offset: 4
111// indent-tabs-mode: nil
112// End:
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