Date: Fri, 3 Aug 2001 13:07:22 -0500 From: Alfred Perlstein <bright@mu.org> To: Ullasan Kottummal <ullasan.kottummal@uk.zurich.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Select call gives EBADF Message-ID: <20010803130722.D85642@elvis.mu.org> In-Reply-To: <OF7573D16B.3BCF5B08-ON80256A9D.003E5851@zurich.com>; from ullasan.kottummal@uk.zurich.com on Fri, Aug 03, 2001 at 12:21:42PM %2B0100 References: <OF7573D16B.3BCF5B08-ON80256A9D.003E5851@zurich.com>
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* Ullasan Kottummal <ullasan.kottummal@uk.zurich.com> [010803 06:23] wrote:
> Hi,
> I am using select() call under HP-UX 10.20 for timing on socket. It throws
> the error EBADF. I don't understand why it happens.
This isn't an HPUX support forum.
Your problem is that:
1) you're using HPUX
2) you didn't read the select(2) manpage carefully enough
3) you didn't provide enough context for this code to be useful
Here's what's probably wrong though:
> The socket is opened successfully before calling the select and the
> descriptor is valid.
>
> I will give the relevant code below.
>
> int mask;
> struct fd_set readmask ;
> readmask.fds_bits[0] = 0;
> struct fd_set readfds;
> int nfound, i;
> struct timeval timeout;
>
> mask = MASK(m_iSocket);
> readmask.fds_bits[0] |= mask;
> readfds.fds_bits[0] = readmask.fds_bits[0];
>
> timeout.tv_sec = m_iSelectTimeout;
> timeout.tv_usec = 0;
> FD_ZERO(&readfds);
Shouldn't this be:
FD_ZERO(&readfds);
FD_SET(m_iSocket, &readfds);
I mean how else is select supposed to know which file you're
interested in???
>
> if ((nfound = select (SOCKETS, &readfds, 0, 0, &timeout)) == -1)
> {
> cerr << "==>Select call failed : " << endl;
> //Errror checking done
> .......
> ........
> }
--
-Alfred Perlstein [alfred@freebsd.org]
Ok, who wrote this damn function called '??'?
And why do my programs keep crashing in it?
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