Change of parameters of the WORKING SOCKET

Whether will probably establish options of a socket already on
existing connection?

for example:

#lsof -i | grep ESTABLISHED
...
firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226-
>mg-in-f147.google.com:http (ESTABLISHED)
....

It is necessary to establish, for example, on this socket option
O_NONBLOCK or O_NODELAY.


Please example code (if exist). Thanks.

On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:
> Whether will probably establish options of a socket already on
> existing connection?
>
> for example:
>
> #lsof -i | grep ESTABLISHED
> ...
> firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
>
> ...
>
> It is necessary to establish, for example, on this socket option
> O_NONBLOCK or O_NODELAY.
>
> Please example code (if exist). Thanks.

static void unset_fl(int fd, int flags) /* flags are file status flags
to turn on
*/
{
int val;

if ((val = fcntl(fd, F_GETFL, 0)) < 0)
printf("error on fcntl GETFL",
1);

val &= ~flags; /* turn on flags
*/

if (fcntl(fd, F_SETFL, val) < 0)
printf("error on fcntl SETFL",
1);
}


static void set_fl(int fd, int flags) /* flags are file status flags
to turn on
*/
{
int val;

if ((val = fcntl(fd, F_GETFL, 0)) < 0)
printf("error on fcntl GETFL",
1);

val |= flags; /* turn on flags
*/

if (fcntl(fd, F_SETFL, val) < 0)
printf("error on fcntl SETFL",
1);
}

On 23 , 04:15, Bin Chen <binary.c...@gmail.com> wrote:
> On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:
>
> > Whether will probably establish options of a socket already on
> > existing connection?
>
> > for example:
>
> > #lsof -i | grep ESTABLISHED
> > ...
> > firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
>
> > ...
>
> > It is necessary to establish, for example, on this socket option
> > O_NONBLOCK or O_NODELAY.
>
> > Please example code (if exist). Thanks.
>
> static void unset_fl(int fd, int flags) /* flags are file status flags
> to turn on
> */
> {
> int val;
>
> if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> printf("error on fcntl GETFL",
> 1);
>
> val &= ~flags; /* turn on flags
> */
>
> if (fcntl(fd, F_SETFL, val) < 0)
> printf("error on fcntl SETFL",
> 1);
>
> }
>
> static void set_fl(int fd, int flags) /* flags are file status flags
> to turn on
> */
> {
> int val;
>
> if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> printf("error on fcntl GETFL",
> 1);
>
> val |= flags; /* turn on flags
> */
>
> if (fcntl(fd, F_SETFL, val) < 0)
> printf("error on fcntl SETFL",
> 1);
>
> }

Heh!, Tanks, But how i connect to fd ?

On Jun 23, 2:31 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:
> On 23 , 04:15, Bin Chen <binary.c...@gmail.com> wrote:
>
>
>
> > On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:
>
> > > Whether will probably establish options of a socket already on
> > > existing connection?
>
> > > for example:
>
> > > #lsof -i | grep ESTABLISHED
> > > ...
> > > firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
>
> > > ...
>
> > > It is necessary to establish, for example, on this socket option
> > > O_NONBLOCK or O_NODELAY.
>
> > > Please example code (if exist). Thanks.
>
> > static void unset_fl(int fd, int flags) /* flags are file status flags
> > to turn on
> > */
> > {
> > int val;
>
> > if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> > printf("error on fcntl GETFL",
> > 1);
>
> > val &= ~flags; /* turn on flags
> > */
>
> > if (fcntl(fd, F_SETFL, val) < 0)
> > printf("error on fcntl SETFL",
> > 1);
>
> > }
>
> > static void set_fl(int fd, int flags) /* flags are file status flags
> > to turn on
> > */
> > {
> > int val;
>
> > if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> > printf("error on fcntl GETFL",
> > 1);
>
> > val |= flags; /* turn on flags
> > */
>
> > if (fcntl(fd, F_SETFL, val) < 0)
> > printf("error on fcntl SETFL",
> > 1);
>
> > }
>
> Heh!, Tanks, But how i connect to fd ?

You want to operate the socket that others created? That is impossible.

On 23 , 10:45, Bin Chen <binary.c...@gmail.com> wrote:

>
> > > if (fcntl(fd, F_SETFL, val) < 0)
> > > printf("error on fcntl SETFL",
> > > 1);
>
> > > }
>
> > Heh!, Tanks, But how i connect to fd ?
>
> You want to operate the socket that others created? That is impossible.

Yes. Why impossible. (i say this my boss)

On 23 , 10:45, Bin Chen <binary.c...@gmail.com> wrote:
> On Jun 23, 2:31 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:
> > On 23 , 04:15, Bin Chen <binary.c...@gmail.com> wrote:
> > > On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:

> > > > Whether will probably establish options of a socket already on
> > > > existing connection?
> > > > for example:
> > > > #lsof -i | grep ESTABLISHED
> > > > firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
> > > > It is necessary to establish, for example, on this socket option
> > > > O_NONBLOCK or O_NODELAY.
> > > > Please example code (if exist). Thanks.
> > > static void unset_fl(int fd, int flags) /* flags are file status flags
> > > int val;
>
> > > if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> > > printf("error on fcntl GETFL",
>
> > > if (fcntl(fd, F_SETFL, val) < 0)
> > > printf("error on fcntl SETFL",

> > Heh!, Tanks, But how i connect to fd ?
>
> You want to operate the socket that others created? That is impossible.


Yes. Why it is impossible. (I shall tell it to my boss)

..

On 23 , 10:45, Bin Chen <binary.c...@gmail.com> wrote:
> On Jun 23, 2:31 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:
> > On 23 , 04:15, Bin Chen <binary.c...@gmail.com> wrote:
> > > On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:

> > > > Whether will probably establish options of a socket already on
> > > > existing connection?
> > > > for example:
> > > > #lsof -i | grep ESTABLISHED
> > > > firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
> > > > It is necessary to establish, for example, on this socket option
> > > > O_NONBLOCK or O_NODELAY.
> > > > Please example code (if exist). Thanks.
> > > static void unset_fl(int fd, int flags) /* flags are file status flags
> > > int val;
>
> > > if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> > > printf("error on fcntl GETFL",
>
> > > if (fcntl(fd, F_SETFL, val) < 0)
> > > printf("error on fcntl SETFL",

> > Heh!, Tanks, But how i connect to fd ?
>
> You want to operate the socket that others created? That is impossible.


Yes. Why it is impossible. (I shall tell it to my boss)

..

On 23 , 10:45, Bin Chen <binary.c...@gmail.com> wrote:
> On Jun 23, 2:31 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:
> > On 23 , 04:15, Bin Chen <binary.c...@gmail.com> wrote:
> > > On Jun 23, 1:55 am, Pavel Vasilyev <l...@nextmail.ru> wrote:

> > > > Whether will probably establish options of a socket already on
> > > > existing connection?
> > > > for example:
> > > > #lsof -i | grep ESTABLISHED
> > > > firefox-b 5026 pavel 36u IPv4 17468 TCP 192.168.1.10:9226->mg-in-f147.google.com:http (ESTABLISHED)
> > > > It is necessary to establish, for example, on this socket option
> > > > O_NONBLOCK or O_NODELAY.
> > > > Please example code (if exist). Thanks.
> > > static void unset_fl(int fd, int flags) /* flags are file status flags
> > > int val;
>
> > > if ((val = fcntl(fd, F_GETFL, 0)) < 0)
> > > printf("error on fcntl GETFL",
>
> > > if (fcntl(fd, F_SETFL, val) < 0)
> > > printf("error on fcntl SETFL",

> > Heh!, Tanks, But how i connect to fd ?
>
> You want to operate the socket that others created? That is impossible.


Yes. Why it is impossible. (I shall tell it to my boss)

..

On Jun 23, 5:19 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:

> Yes. Why it is impossible. (I shall tell it to my boss)

If the code was designed to handle a socket in those modes, it would
have set the socket to those modes. If the code was not designed to
handle a socket in those modes, it may break if it gets one.

What are you actually trying to do? Why would you want to change the
blocking or Nagle state of another process' connections?!

DS

David Schwartz:
> On Jun 23, 5:19 pm, Pavel Vasilyev <l...@nextmail.ru> wrote:
>
> > Yes. Why it is impossible. (I shall tell it to my boss)
>
> If the code was designed to handle a socket in those modes, it would
> have set the socket to those modes. If the code was not designed to
> handle a socket in those modes, it may break if it gets one.
>
> What are you actually trying to do? Why would you want to change the
> blocking or Nagle state of another process' connections?!
>
Yes, need set/unset O_NODELAY option on working connection!