[ECOS] fcntl error

[ECOS] fcntl error

[aditya veer singh]

When I try to set a file descriptor as non blocking using system call:
fcntl(fd, F_SETFL, O_NONBLOCK) it returns an error during call of FILEIO_RETURN.
fd provided for the function is a valid one.

Can someone provide me with few pointers as what can be possibly wrong with the above call?

Thanks in advance,

Aditya 


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Re: [ECOS] fcntl error

[Andrew Lunn]

On Fri, May 12, 2006 at 05:56:38PM +0630, aditya veer singh wrote:
> 
> 
> When I try to set a file descriptor as non blocking using system call:
> fcntl(fd, F_SETFL, O_NONBLOCK) it returns an error during call of FILEIO_RETURN.
> fd provided for the function is a valid one.
> 
> Can someone provide me with few pointers as what can be possibly wrong with the above call?

The quickest way to understand this is simply single step the function
call and find out where the error occurs. 

Use the source since you have it.

    Andrew

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Re: [ECOS] fcntl error

[aditya veer singh]

On Fri, 12 May 2006 14:06:10 +0200, Andrew Lunn wrote
> On Fri, May 12, 2006 at 05:56:38PM +0630, aditya veer singh wrote:
> > 
> > 
> > When I try to set a file descriptor as non blocking using system call:
> > fcntl(fd, F_SETFL, O_NONBLOCK) it returns an error during call of FILEIO_RETURN.
> > fd provided for the function is a valid one.
> > 
> > Can someone provide me with few pointers as what can be possibly wrong with the
above call?
> 
> The quickest way to understand this is simply single step the function
> call and find out where the error occurs.
> 
> Use the source since you have it.
> 
>     Andrew

What I understand from the code of fcntl is that 
there is no case written for F_SETFL,
only case which is handled is F_DUPFD.
Therefore it returns a value of ENOTSUP.

Can command F_SETFL with O_NONBLOCK be used in eCos or is it a limitation? 
What needs to be done support it?
Is there any other way to get the same result as from fcntl(fd, F_SETFL, O_NONBLOCK) by
using some other functions?

Aditya






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[ECOS] Re: fcntl error

[Daniel Néri]

"aditya veer singh" <adityav@cdotd.ernet.in> writes:

> Is there any other way to get the same result as from
> fcntl(fd, F_SETFL, O_NONBLOCK) by using some other functions?

Yes, you can use ioctl(2) on socket file descriptors:

  int nonblock_enable(int fd) {
     int flag = 1;
     return ioctl(fd, FIONBIO, &flag);
  }


Regards,
-- 
Daniel Néri <daniel.neri@sigicom.se>
Sigicom AB, Stockholm, Sweden


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