Path: utzoo!attcan!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!amdahl!amdcad!tim
From: tim@amdcad.AMD.COM (Tim Olson)
Newsgroups: comp.unix.wizards
Subject: Re: I need a SysV select()
Message-ID: <21654@amdcad.AMD.COM>
Date: 17 May 88 16:19:42 GMT
References: <9738@sol.ARPA> <10293@ulysses.homer.nj.att.com>
Reply-To: tim@amdcad.UUCP (Tim Olson)
Organization: Advanced Micro Devices
Lines: 25

In article <10293@ulysses.homer.nj.att.com> ekrell@hector (Eduardo Krell) writes:
| In article <9738@sol.ARPA> jpayne@rochester.UUCP writes:
| 
| >Hi.  The simple version of my question is, is there an equivalent
| >function in SysV for BSD's select()?
| 
| The simple version of my answer is NO.
| 
| >If the answer is no, here's what I am trying to do.  I want to get input
| >from either the keyboard or from some other file description.
| 
| System V Release 3 and up have a poll() system call which acts like
| select(), but works only on stream file descriptors.  Currently, the
| tty driver is not streams-based (it will be in the future), so poll()
| won't help you either.
|     

The only way I have found to do this kind of thing under SYSV is to
restructure the program to have a child process dedicated for each fd of
the select(), and have them communicate through shared memory, or
perhaps named pipes.

	-- Tim Olson
	Advanced Micro Devices
	(tim@amdcad.amd.com)