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From:	"Lev Pliner" <pliner AT sky DOT ru>
To:	<cygwin AT cygwin DOT com>
Subject:	Question about select function
Date:	Fri, 18 Jun 2004 15:41:59 +0600
MIME-Version:	1.0
X-IsSubscribed:	yes

Dear forum members!

I'm writing a multithreaded rpc program. The following is a part of my
program that causes a error:

  fd_set readfds;
  int size = getdtablesize ( );

  while ( 1 )
  {
    readfds = svc_fdset;

    switch ( select ( size, &readfds, NULL, NULL, NULL ) )
    {
      case -1:
        if ( errno == EINTR )
          continue;
        else ...
      break;
      case 0:
        continue;
      break;
    };
  };

"select" call here causes the following error: "Bad file descriptor". This
example was taken from "Power programming with RPC" by John Bloomer.

I tried to understand what svc_fdset consits of:
sizeof ( svc_fdset ) == 2

Thus fd_set.fd_bits array has two elements:
sprintf ( "%ld %ld\n", svc_fdset.fds_bits [ 0 ], svc_fdset.fds_bits [ 1 ] )
== "8 0"

But somehow:
for (i=0;i<64;i++) FD_SET (i, svc_fdset) == 1

Could anyone tell me how to solve this problem?

Lev.


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