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from erik quanstros 9fans post:
i think the list insertion code needs a single-read
test that f->alarm != 0. to prevent the 0 from
acting like a fencepost. e.g. trying to insert -10 into
list -40 -30 0 -20.
if(alarms.head) {
l = &alarms.head;
for(f = *l; f; f = f->palarm) {
>> fw = f->alarm;
>> if(fw != 0 && (long)(fw - when) >= 0) {
up->palarm = f;
*l = up;
goto done;
}
l = &f->palarm;
}
*l = up;
}
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disabling mouse packet streaming command 0xf5 can fail
when a packet is currently transmitted.
this can be seen when one moves the mouse while running:
while(){echo accelerated >/dev/mousectl; sleep 0.5}
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sometimes, ps2 mouse setup failed on thinkpads during boot. disabling
packet streaming while we program the mouse seems to fix the issue.
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make sure not to dereference Proc* nil pointer. this can potentially
happen from devip which has code like:
if(er->read4p)
postnote(er->read4p, 1, "unbind", 0);
the process it is about to kill can zero er->read4p at any time,
so there is the possibility of the condition to be true and then
er->read4p becoming nil.
check if the process has already exited (p->pid == 0) in postnote()
under p->debug qlock.
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postnote does not raise error, so the error label is not
neccesary.
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when alarmkproc is commited to send the alarm note to the process,
the process might have exited already, or worse, being reused for
another process. pexit() zeros p->alarm at the beginning, but the
kalarmproc() might read p->alarm before pexit() zeroed it, decide
to send the note, then get preempted and pexit() releases the proc.
once kalarmproc() is resumed, the proc might be already something
different and we send the note to the wrong thing.
we now check p->alarm under the debug qlock. that way, pexit()
cannot make progress while we test the condition.
remove the error label arround postnote(). postnote does not raise
error.
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make sure noteid is valid (>0).
prohibit changing note group of kernel processes. this is also
checked for in pgrpnote().
prevent "none" user from changing its note group to another "none"
sessions. this would allow him to send notes other none processes
other than its own.
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one can add:
int idle_spin = 1;
in the kernel configuration to enable the old behaviour. see the
comment at idlehands().
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the cache can be inspected more easily with acid kernel library.
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pprint() might block or even (maliciously) call into
devproc write which will corrupt the qlock chain on attempt
to qlock up->debug again.
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sysexec()
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this works differently from mischiefs original patch. instead of
overloading the address bar, we popup our own enter box. the
function can be invoked from the menu or by hitting ^F.
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including <string.h> should be enougth to make strdup()
available.
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preventing wheel buttons 4 and 5 fron getting stuck
with multiple input devices.
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in the kernel, area can lie above 0xff000000
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with window -m, properly remove the old wsys from /dev before
binding new window to it, so the original window wont leak
into the new namespace.
do not pass -pid when $wsys does not refer to a local running rio.
cleanup environment before running sub-process.
set window label consistentently no matter if -m is used or not.
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translated offscreen
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frequently contain commas
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add new functions pageaddr() that returns a string describing
the page to be loaded. it is in the form of:
/path/to/file!pagename!subpage!....
one can jump to such a page by calling trywalk(name, addr)
where name and addr get concatinated with ! to form a page
address and then the currently loaded pages are walked up
to the nearest page which is then returned. (or nil when
not found). the remaining address will be set in the global
pagewalk variable.
once pages get loaded (asynchronously), pagewalk1() gets
called again on addpage() and continues the walking up to the
last page.
new program flag -j <addr> was added to jump to a page on
startup.
page address (without filename) can also be supplied in
plumb message with the "addr" attribute.
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rio looks backwards in the line for the beginning of a filename
that needs to be completed with ^F. this change makes the
characters: =, ^, ( and { stoppers, so filename completion
will work in all these cases:
foobar=/foo/ba^F; for(i in (fo^F ba^F)){/bin/baz^F
this means completion will not work for prefixes having these
special characters in them.
thanks to burnzez for bringing it up.
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the alloc and realloc tag words do not start at the beginning of
a block created by mallocalign(). instead, the block is padded
with ALIGN_MAGIC.
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