852028e@aucs.uucp (Amari M. Elammari) (05/26/90)
Is there a UNIX C (sun4 C) function that checks if the input buffer is empty??? What I want to do is to check the buffer, if there are some characters in the buffer then read them; otherwise continue with the next statement. -- Amari Elammari. Acadia University, Wolfville, N.S., Canada P.O.BOX 1236 Wolfville, N.S. Canada BOP 1X0 BITNET 852028e@Acadia Internet 852028e@AcadiaU.CA
gwyn@smoke.BRL.MIL (Doug Gwyn) (05/27/90)
In article <1990May26.144958.4395@aucs.uucp> 852028e@aucs.UUCP (Amari M. Elammari) writes: > Is there a UNIX C (sun4 C) function that checks if the input buffer > is empty??? >What I want to do is to check the buffer, if there are some >characters in the buffer then read them; otherwise continue >with the next statement. To which "input buffer" do you refer? There are several different kinds of "input buffer" possible for a UNIX C program. If your program maintains its own buffer, it should be able to test it; the stdio buffer is not worth testing, because of the way stdio uses it; kernel disk block buffers are also not worth testing; streams can be tested with select() or poll(); under some circumstances the terminal handler MIN & TIME parameters might be appropriate.
alan@george.Jpl.Nasa.Gov (Alan S. Mazer) (05/30/90)
In article <1990May26.144958.4395@aucs.uucp>, 852028e@aucs.uucp (Amari M. Elammari) writes: > Is there a UNIX C (sun4 C) function that checks if the input buffer > is empty??? Under 4.2 there was an FIONREAD ioctl -- not sure if this is still available. That returned the number of characters waiting to be read. You can also use select() to find out if something is there. -- Alan # "But seriously, what could go wrong?" ..!ames!elroy!alan alan@elroy.jpl.nasa.gov