Hi Group,

for porting issues, I need to translate a fcntl(). In the original
*nix-code the following is used:

fcntl(sd, F_SETFL, O_NONBLOCK);

to make sd a non blocking socket. Now I was wondering if

// If iMode = 0, blocking is enabled;
// If iMode != 0, non-blocking mode is enabled.
int iMode = 1;
ioctlsocket(sd, FIONBIO, (u_long FAR*) &iMode)

contains the same behaviour for win32 systems.

Many kind greetings,

--wim

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Wim Deprez wrote:
> Hi Group,
>
> for porting issues, I need to translate a fcntl(). In the original
> *nix-code the following is used:
>
>    fcntl(sd, F_SETFL, O_NONBLOCK);
>
> to make sd a non blocking socket. Now I was wondering if
>
>    // If iMode = 0, blocking is enabled;
>    // If iMode != 0, non-blocking mode is enabled.
>    int iMode = 1;
>    ioctlsocket(sd, FIONBIO, (u_long FAR*) &iMode)
>
> contains the same behaviour for win32 systems.

You'd better ask in Winsock programming group, like
alt.winsock.programming.

However, it is easy to test: just open a connection
to a remote host and execute the following:

int r;
char buf;

r1 = read(fd, &buf, 1);

assert(r1 == -1 && errno == EAGAIN);

or something similar.

(make sure the remote host does not send anything.
www.com:80 will do).

--
Lev Walkin
vlm@lionet.info

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Wim Deprez wrote:

> for porting issues, I need to translate a fcntl(). In the original
> *nix-code the following is used:
>
>    fcntl(sd, F_SETFL, O_NONBLOCK);
>
> to make sd a non blocking socket. Now I was wondering if

If you only want to switch from blocking to non-blocking mode, you should
first get the current flags, add O_NONBLOCK and then set these flags.
The above code would clear the current flags set.

Regards,
Daniel

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