mackeown@CompSci.Bristol.AC.UK (W. Mackeown) (02/02/90)
Does anyone know if it is possible to force SunOS v4.0.1 Unix on Sun 3/50's to do unbuffered pipeline I/O ? What is wanted is a way to make system commands send their output through a pipe in unbuffered form, ie. a single character at a time. "stty +cbreak" obviously won't accomplish this. Any ideas/suggestions welcomed. Thanks. William Mackeown mackeown@compsci.bristol.ac.uk
richard@aiai.ed.ac.uk (Richard Tobin) (02/09/90)
In article <1320@csisles.Bristol.AC.UK> mackeown@csisles.UUCP (W. Mackeown) writes: >Does anyone know if it is possible to force SunOS v4.0.1 Unix on Sun 3/50's >to do unbuffered pipeline I/O ? What is wanted is a way to make system >commands send their output through a pipe in unbuffered form, ie. a single >character at a time. "stty +cbreak" obviously won't accomplish this. If a program is using standard i/o to write to a pipe, then there's no way to remove the buffering without modifying the program - the buffering is done by the program, not by the operating system. What you *can* do is use a pseudo-terminal instead of a pipe. Then the buffering will be the same as when the program is sending output to the screen - typically a line at a time. This may or may not be good enough. You won't be able to arrange this from a standard shell, but you could write a program that takes two commands and connects them through a pseudo- terminal. -- Richard -- Richard Tobin, JANET: R.Tobin@uk.ac.ed AI Applications Institute, ARPA: R.Tobin%uk.ac.ed@nsfnet-relay.ac.uk Edinburgh University. UUCP: ...!ukc!ed.ac.uk!R.Tobin