Long ago I looked at the libbsd contribution,
and was sad that it didn't come with the sources.
Just include files.
So, with Ron's request, I started playing with it.
So, here are some details of my testing....
1. extracted the OIO module from libbsd.a (NMRL),
which contains tread,twrite.
(Had to manipulate the libbsd.a file some, in order to access it)
2. create this C test program
/*----------------------------------------------------------------*/
#pragma intrinsic FOPEN
#pragma intrinsic FCLOSE
proc int main ()
{
int R, n;
short f;
char buf [40];
f = FOPEN ( "TTY", 0644, 00004 ); /* cctl,und,stdin,ascii r/w */
printf ("tread 5>");
fflush (stdout);
memset (buf, '*', 10);
buf [10] = 0;
R = tread (f, buf, 5);
printf ("tr %d [%s]\n", R, buf);
n = sprintf (buf, "-twrite-");
R = twrite (f, buf, n);
printf ("tw %d\n", R);
R = tread (f, buf, 0);
printf ("Done\n");
FCLOSE ( f, 0, 0 );
return 0;
}
/*----------------------------------------------------------------*/
Appears to run ok.
tread acts like a binary read. It must read the count chars. ie, 5 in my
code.
return does not terminate the read.
tread returns the number of chars read. uses an MPE file number.
twrite returns the number of chars written.
Next I need to test as 2 processes or 2 threads to have them both
active.
The problem however, is it leaves the terminal in some odd state.
Once the program ends, I get the CI prompt. But when hit return,
it appears to be hung. It can receive TELLs.
If from another session, I do abortio on its stdlist device, it shows
SOFTWARE ABORT,
get the CI prompt. But hung again.
After aborting the session, (reflection nsvt), I can log back in and have a
normal tty.
Oh, program requires PM. Underneath tread/twrite, it calls sendio and
rendezvousio.
I did try FOPEN with nowait-io set.
tread didn't read (no echo of chars) and could not complete the read.
Keven Miller
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