matsl@nada.kth.se (Mats Luthman) (09/22/89)
I know how to do it in both BSD and AT&T UNIX, but I can't find a fcntl function in libc.a (on MINIX-ST). I can find gtty and stty, but I can't find documentation about them anywhere. I remember reading something about them a long time ago, but I don't remember enough. Aren't they considered obsolete? And by the way, is there a manual on MINIX system calls? I have the book, but it doesn't say very much about how to use them, and gtty and stty aren't even mentioned (in the index). I have the AT&T manual, but it doesn't seem to help me, at least not in this case. Another thing I can't find is macros for the mode parameter to open(). Another thing I want to know: if I want a certain function to be called every time there is input available on a file descriptor, what do I do? There is no SIGIO signal, so I wonder if it is at all possible.
ast@cs.vu.nl (Andy Tanenbaum) (09/23/89)
In article <1730@draken.nada.kth.se> matsl@nada.kth.se (Mats Luthman) writes: >I know how to do it in both BSD and AT&T UNIX, but I can't find a fcntl >function in libc.a (on MINIX-ST). I can find gtty and stty, but I can't find >documentation about them anywhere. stty and gtty are just repackagings of ioctl, which is the standard V7 way to control TTYs. As to documentation, MINIX is more-or-less based on the V7 manual: The UNIX programmer's manual, Vols. 1-2 Bell Labs Published by Holt Rinehart and Winston, 1983 ISBN 0-03-061742-1 Andy Tanenbaum (ast@cs.vu.nl)
henry@utzoo.uucp (Henry Spencer) (09/23/89)
In article <1730@draken.nada.kth.se> matsl@nada.kth.se (Mats Luthman) writes: >I know how to do it in both BSD and AT&T UNIX, but I can't find a fcntl >function in libc.a (on MINIX-ST)... This function did not exist in V7, which is what Minix is modelled on. Nor did the ability to determine presence of pending input. >.... doesn't say very much about how to use them, and gtty and stty >aren't even mentioned (in the index). Minix has probably emulated V7 in this regard: gtty and stty were obsolete backwards-compatibility interfaces for ioctl. They can't do anything that ioctl can't. >... Another thing I can't find is macros for the mode parameter to open(). Again, in V7 there weren't any. The mode parameter was specified as integer values (0 readonly, 1 writeonly, 2 readwrite). >Another thing I want to know: if I want a certain function to be called >every time there is input available on a file descriptor, what do I do? >There is no SIGIO signal, so I wonder if it is at all possible. Can't be done in V7. SIGIO is a hideous botch; I'm not surprised that Andy didn't put it into Minix. -- "Where is D.D. Harriman now, | Henry Spencer at U of Toronto Zoology when we really *need* him?" | uunet!attcan!utzoo!henry henry@zoo.toronto.edu