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July 1997

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Subject:
From:
Kent Covert <[log in to unmask]>
Reply To:
Miami University OpenVMS <[log in to unmask]>
Date:
Wed, 16 Jul 1997 09:11:41 -0500
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text/plain
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In article <[log in to unmask]>, George <[log in to unmask]>
writes:
> <fcntl.h> doesn't seem to define fcntl()...nor does <sys/fcntl.h>
>
> Specifically I need it for this function:
> void nonblock(socket_t s)
> {
>   int flags;
>
>   flags = fcntl(s, F_GETFL, 0);
>   flags |= O_NONBLOCK;
>   if (fcntl(s, F_SETFL, flags) < 0) {
>     perror("Fatal error executing nonblock (comm.c)");
>     exit(1);
>   }
> }
 
Be careful with this.  Under Unix, sockets and file descriptors can be used
interchangably.  This is not the case with our TCP/IP stack on VMS
(although other stacks allow this).  If you need this feature, contact me
directly and I'll see what I can do.
 
> What is the correct way to make a socket non-blocking? (If no way I'll use
> my current work-around #define POSIX_NONBLOCKING_BROKEN)
 
To make a socket non-blocking, you need to call the socket_ioctl() function
with the FIONBIO option.  Specifically, here's an example:
 
    unsigned int enable=1;
    status = socket_ioctl(socket, FIONBIO, &enable);
 
> And also, where is gettimeofday()? Not <sys/time.h>, <time.h>...
> I've cheated by prototyping it at 'int gettimeofday()' but as I have not
> linked it yet I do not know it it will work.
 
The gettimeofday() function is not implemented in our current version of
the C compiler.  It is implemented in a new version of the C compiler that
I have planned to install this summer.  Contact me directly for more
information about getting to this version for testing.
 
> PS - Pico always says it can unjustify after doing a search.  The
> search options for UNIX include ^Y and ^V to go to the top and bottom of
> the file respectively, which Pico on the VAX doesn't.
 
I don't think I can help you there.
 
> (I also hate typing
> 'ls' and getting an editor, but that's OS differences) :)
 
You can get around this somewhat by adding the following line to your
LOGIN.COM file:
 
    $ LS :== DIR
 
That will create a new "command" called LS that issues the DIR command.
 
--
                                     Kent Covert, Software Coordinator
                                     Miami Computing and Information Services
                                     Miami University, Oxford, OH
                                     [log in to unmask]

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