mri@fungus.bsd.uchicago.edu (Xiaoping Hu) (07/11/90)
Hai everyone out there, Does anybody know when we requested signal SIGIO on a serial port,which serial line and what condition of the serial line does the system monitor before considering input/output is possible on the port ? I would appreciate very much if anybody can give me a hint.
ray@ctbilbo.UUCP (Ray Ward) (08/23/90)
I assume you are referring to the SIGIOT signal, and that you have set up
a signal handler for this signal, and that you are now wondering under
what circumstances will this SIGIOT signal be generated. ("when we requested
signal SIGIO" is a little confusing)
You did not mention what hardware or system software you are using.
According to the System V Interface Definition, the SIGIOT signal's
meaning is implementation dependent: it may mean one thing on Company A's
machine and quite a different thing on Company B's. You should look up
signal(BA_OS) or signal(S) or whatever designates your local man pages
for system calls, or call your manufacturer if you don't have on-line
man pages.
The action and meaning of interrupts is a function of the hardware and
the operating system. It is not fundamentally a part of the C language,
although some allowance for basic signals is in ANSI C (see section 4.7).
You will notice that SIGIOT is not described in the ANSI C definition.
A better place to post your questions concerning signals might be
comp.unix.questions or comp.unix.xenix or some newsgroup that is more
closely related to your hardware/operating system.
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Ray Ward Email: uunet!ctbilbo!ray
Voice: (214) 991-8338x226, (800) 331-7032 Fax : (214) 991-8968
=-=-=-=- There _are_ simple answers, just no _easy_ ones. -- R.R. -=-=-=-=