how to intilise a non blocking socket?

lolguy · 03-18-2009, 09:05 PM

sorry guys for asking this stupid question but i cant find anything like how to intilise a non blocking all stuff i searched on google says some junk stuff and no code for it it would be great if someone showed a simple code with use of non blocking on it thanks .

carrotcake1029 · 03-18-2009, 10:35 PM

You can use fcntl() to change a socket to be blocking or nonblocking.

Code:

result = fcntl(sck, F_GETFL, NULL);
//This sets the socket to nonblocking
result |= O_NONBLOCK;

Code:

result = fcntl(sck, F_GETFL, NULL);
//This sets the socket to blocking
result &= (~O_NONBLOCK);

Might also be a good idea to check if result < 0 from the call to fcntl, which indicates an error.

Edit: This is after you have actually created the socket (sck = socket())

lolguy · 03-18-2009, 10:55 PM

yes but i think that function is linux right ?not win?

carrotcake1029 · 03-18-2009, 10:59 PM

So sorry, just making blind assumptions.

I think the equivalent would be basically the same thing but using ioctlsocket() with a FIONBIO flag.

msdn:

Code:

//-------------------------
// Set the socket I/O mode: In this case FIONBIO
// enables or disables the blocking mode for the 
// socket based on the numerical value of iMode.
// If iMode = 0, blocking is enabled; 
// If iMode != 0, non-blocking mode is enabled.
u_long iMode = 0;
ioctlsocket(m_socket, FIONBIO, &iMode);

Nightowl · 03-18-2009, 11:15 PM

Note that winsock is almost a direct clone of the BSD sockets library, which is what Linux uses . . .

lolguy · 03-19-2009, 08:13 PM

Quote:

Originally Posted by carrotcake1029

So sorry, just making blind assumptions.

I think the equivalent would be basically the same thing but using ioctlsocket() with a FIONBIO flag.

msdn:

Code:

//-------------------------
// Set the socket I/O mode: In this case FIONBIO
// enables or disables the blocking mode for the 
// socket based on the numerical value of iMode.
// If iMode = 0, blocking is enabled; 
// If iMode != 0, non-blocking mode is enabled.
u_long iMode = 0;
ioctlsocket(m_socket, FIONBIO, &iMode);

then i can make connect normal ?

lolguy · 03-19-2009, 08:22 PM

anyways let me post my problem code in other thread . thanks for the help guys.

lolguy · 03-20-2009, 12:18 AM

oh i forgot WSAstartup stupid me

03-18-2009, 09:05 PM	#1
lolguy Registered User Join Date: Dec 2008 Posts: 183	how to intilise a non blocking socket? sorry guys for asking this stupid question but i cant find anything like how to intilise a non blocking all stuff i searched on google says some junk stuff and no code for it it would be great if someone showed a simple code with use of non blocking on it thanks .
lolguy is offline

03-18-2009, 10:35 PM	#2
carrotcake1029 Registered User Join Date: Apr 2008 Posts: 309	You can use fcntl() to change a socket to be blocking or nonblocking. Code: result = fcntl(sck, F_GETFL, NULL); //This sets the socket to nonblocking result \|= O_NONBLOCK; Code: result = fcntl(sck, F_GETFL, NULL); //This sets the socket to blocking result &= (~O_NONBLOCK); Might also be a good idea to check if result < 0 from the call to fcntl, which indicates an error. Edit: This is after you have actually created the socket (sck = socket())
carrotcake1029 is offline

03-18-2009, 10:55 PM	#3
lolguy Registered User Join Date: Dec 2008 Posts: 183	yes but i think that function is linux right ?not win?
lolguy is offline

03-18-2009, 11:15 PM	#5
Nightowl Resu Deretsiger Join Date: Nov 2008 Location: /dev/null Posts: 185	Note that winsock is almost a direct clone of the BSD sockets library, which is what Linux uses . . . __________________ Do as I say, not as I do . . . Experimentation is the essence of programming. Just remember to make a backup first. "I'm a firm believer that <SomeGod> gave us two ears and one mouth for a reason - we are supposed to listen, twice as much as we talk." - LEAF Questions posted by these guidelines are more likely to be answered. Debian GNU/Linux user, with the awesome window manager, the git version control system, and the cmake buildsystem generator.
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03-19-2009, 08:22 PM	#7
lolguy Registered User Join Date: Dec 2008 Posts: 183	anyways let me post my problem code in other thread . thanks for the help guys.
lolguy is offline

03-20-2009, 12:18 AM	#8
lolguy Registered User Join Date: Dec 2008 Posts: 183	oh i forgot WSAstartup stupid me
lolguy is offline

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