Hi Everyone. First post to this group.
I'm controlling the output stream created by
::CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, (CFStringRef)hostAddress, portNum, &readStream, &writeStream);
::CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
::CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
and later bridged to NSInputStream and NSOutputStream instances, via its internal native socket, using the posix getsockopt and setsockopt calls.
The properties I need to work with are the read (input) and write (output) buffer sizes, and the write (output) socket's buffer pending content size.
Things like this...
oss = getsockopt(socket,SOL_SOCKET,SO_RCVBUF,&value,&valueSize); oss = setsockopt(socket,SOL_SOCKET,SO_SNDBUF, &value, sizeof(value);
oss = getsockopt(socket,SOL_SOCKET,SO_NWRITE, &value, &valueSize);
etc.
To retrieve the native socket I'm using code like this:
// Getting the amount of bytes in the output socket buffer which are waiting to be sent
- (int) getSocketOutputBufferPendingSize:(uint32_t*)bufSize {
int oss = -1;
CFDataRef data = ""> do {
if (_outputStream==nil)
break;
// retrieve native socket handle from output stream.
if((data = "" kCFStreamPropertySocketNativeHandle))== NULL)
break;
CFSocketNativeHandle socket;
CFDataGetBytes(data, CFRangeMake(0, sizeof(CFSocketNativeHandle)), (UInt8*)&socket);
.
. . // --- here I work with the native socket properties.
.
} while (false);
if(data!= NULL)
::CFRelease(data);
return oss;
}
My questions are:
1. What is the lifespan of the native socket handle? 2. Can I retrieve it once, when the socket is created or opened the first time, then use it until socket is closed, or should I retrieve it from the stream like this, every time I want to use it? 3. What is the cost of the above lines that retrieve the native socket handle? Thanks! Motti Shneor. ---------------------------------------- Ceterum censeo Microsoftinem delendam esse |