Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!bionet!ames!attctc!digi!kcantrel
From: kcantrel@digi.UUCP (Keith Cantrell)
Newsgroups: comp.sys.apollo
Subject: Re: Async. socket i/o
Message-ID: <219@digi.UUCP>
Date: 5 Sep 89 23:24:18 GMT
References: <1308@syma.sussex.ac.uk>
Reply-To: kcantrel@digi.UUCP (Keith Cantrell)
Organization: none
Lines: 43

In article <1308@syma.sussex.ac.uk> andrewn@syma.UUCP (Andrew D Nimmo) writes:
>
>	Is, as is implied in the 'Programming Enviroment Reference' manual,
>the use of asynchronous socket i/o (using fcntl, select and signal) not
>possible under SR10.1 (and SR10.0.p)?  If this is true when will it be
>implemented, or does an update exist to patch this potentially serious ommision?
>	My problem stems from an fcntl call returning the error 'No such file
>or directory' when applied to a known (UNIX) socket - although this is a valid
>error, it does not appear to be a valid fcntl error.
>

I was receiving this error too when I was tring to put a socket into non-blocking
mode.  The problem turned out to be that I was not doing a fcntl(fd, F_GETFL, 0)
before I was doing the fcntl(fd, F_SETFL, FNDELAY).  The code segment should be
something like:

  if((a = fcntl(fd, F_GETFL, 0)) == -1)
  {
    perror("error");
    exit(1);
  }
  a |= FNDELAY:
  if(fcntl(fd, F_SETFL, a) == -1)
  {
    perror("error");
    exit(1);
  }

This should clear up your 'no such file or directory' error.  One thing to note,
if you set the environment variable "APOLLO_STATUS" to "TRUE" before you executre
a program that makes a calls to "perror", you will get much better error messages.

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Keith Cantrell                    Phones:  hm: 214-492-1088
Apollo Computer                            wk: 214-519-2399 @ DSC 
A Subsidiary of Hewlett-Packard
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My opinion is my own and does not reflect the view of my employer.
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