Areed.183
net.v7bugs
utzoo!decvax!ucbvax!ihnss!cbosg!harpo!chico!duke!reed!valer
Fri Jul 31 20:51:10 1981
proc on q
/*
* This program helps generate the "proc on q"
* diagnostic. By putting a 9600 keyboard in
* CBREAK mode and pounding on the keyboard,
* we have been able to consistently produce the
* diagnostic in the first line or two of typing.
* This diagnostic comes from an interrupt window
* in the following code in sig.c:
* if(p->p_stat == SSLEEP && p->p_pri > PZERO)
* setrun(p);
* The fix is to bracket the code as follows:
* s = spl6();
* <ABOVE CODE>
* splx(s);
*/
brkpt() { }
main()
{
char c;
int child;
switch(child = fork()) {
case 0:
for (signal(5, brkpt); ; )
read(0, &c, 1);
case -1:
perror("fork");
break;
default:
sleep(2);
printf("start typing\n");
for ( ; ; )
kill(child, 5);
}
}
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