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This is where we end up when calling tcsetattr() with TCSAFLUSH.
This fixes vttest not accepting the first keystroke as input.
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We now require the "settime" promise from pledged processes who want to
change the system time.
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Instead of checking this on every page allocation, just check it once
on startup. :^)
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This makes iterating over a specific type of VMObjects a bit nicer.
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It didn't feel right to have a "DHCPClient" in a "Servers" directory.
Rename this to Services to better reflect the type of programs we'll
be putting in there.
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Ultimately we should not panic just because we can't fully commit a VM
region (by populating it with physical pages.)
This patch handles some of the situations where commit() can fail.
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I don't see a reason for these to be reference-counted, and removing it
simplifies a bunch of surrounding data structures.
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Add missing installations to instructions, and use genext2fs instead
of mounting.
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This caused us to report one purged page per occurrence of the shared
zero page in a purgeable memory region, despite it being a no-op.
Thanks to Sergey for spotting the bad assertion removal that led to
this being found!
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This patch adds PageFaultResponse::OutOfMemory which informs the fault
handler that we were unable to allocate a necessary physical page and
cannot continue.
In response to this, the kernel will crash the current process. Because
we are OOM, we can't symbolicate the crash like we normally would
(since the ELF symbolication code needs to allocate), so we also
communicate to Process::crash() that we're out of memory.
Now we can survive "allocate 300 MB" (only the allocate process dies.)
This is definitely not perfect and can easily end up killing a random
innocent other process who happened to allocate one page at the wrong
time, but it's a *lot* better than panicking on OOM. :^)
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This function has a lot of callers that don't bother checking if it
returns successfully or not. We'll need to handle failure in a bunch
of places and then we can remove this assertion.
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We now give callers a chance to react to OOM situations.
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MUTLIBOOT_FRAMEBUFFER_TYPE_{RGB,EGA_TEXT} are defined in the Multiboot.h
header. Use those definitions instead of hard-coding 1 and 2.
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If the exec promises fail to apply, then the normal promises should
not apply either. Add a test for this fixed functionality.
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This was very helpful when adding support for 5-button mice! :^)
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The detection works very similarly to how we detect a mouse wheel, just
another magical sequence of "set sample rate" requests to the mouse
followed by an ID check.
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It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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This made it possible to map the E1000 MMIO range into userspace and
mess with the registers.
Thanks to @grigoritchy for finding this!
Fixes #2015.
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If we OOM during a CoW fault and fail to allocate a new page for the
writing process, just leave the original VMObject alone so everyone
else can keep using it.
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Since a Region is basically a view into a potentially larger VMObject,
it was always necessary to include the Region starting offset when
accessing its underlying physical pages.
Until now, you had to do that manually, but this patch adds a simple
Region::physical_page() for read-only access and a physical_page_slot()
when you want a mutable reference to the RefPtr<PhysicalPage> itself.
A lot of code is simplified by making use of this.
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Previously we blindly just called update_next_timer_due() when
ever we modified the timer list. Since we know the list is sorted
this is a bit wasteful, and we can do better.
This change refactors the code so we only update the next due time
when necessary. In places where it was possible the code was modified
to directly modify the next due time, instead of having to go to the
front of the list to fetch it.
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The public consumers of the timer API shouldn't need to know
the how timer id's are tracked internally. Expose a typedef
instead to allow the internal implementation to be protected
from potential churn in the future.
It's also just good API design.
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Utilize the new Thread::wait_on timeout parameter to implement
timeout support for FUTEX_WAIT.
As we compute the relative time from the user specified absolute
time, we try to delay that computation as long as possible before
we call into Thread::wait_on(..). To enable this a small bit of
refactoring was done pull futex_queue fetching out and timeout fetch
and calculation separation.
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This change plumbs a new optional timeout option to wait_on.
The timeout is enabled by enqueing a timer on the timer queue
while we are waiting. We can then see if we were woken up or
timed out by checking if we are still on the wait queue or not.
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The current API of add_timer makes it hard to use as
you are forced to do a bunch of time arithmetic at the
caller. Ideally we would have overloads for common time
types like timespec or timeval to keep the API as straight
forward as possible. This change moves us in that direction.
While I'm here, we should really also use the machines actual
ticks per second, instead of the OPTIMAL_TICKS_PER_SECOND_RATE.
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Also take the hostname string lock exclusively.
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Userland/hostname: Now takes parameter to set the hostname
LibC/unistd: Added sethostname function
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This is a special case that was previously not implemented.
The idea is that you can dispatch a signal to all other processes
the calling process has access to.
There was some minor refactoring to make the self signal logic
into a function so it could easily be easily re-used from do_killall.
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Previously we just woke all waiters no matter how many were
requested. Fix this by implementing WaitQueue::wake_n(..).
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Previously, when returning from a pthread's start_routine, we would
segfault. Now we instead implicitly call pthread_exit as specified in
the standard.
pthread_create now creates a thread running the new
pthread_create_helper, which properly manages the calling and exiting
of the start_routine supplied to pthread_create. To accomplish this,
the thread's stack initialization has been moved out of
sys$create_thread and into the userspace function create_thread.
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The HTTP JSON API this relied on is no longer available via HTTP and
I would rather make the website work in Browser anyway. :^)
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We can't assume there's always a parent custody -- when we open "/"
there isn't gonna be one!
Fixes #1858.
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lookup() returns an Optional<String> which allows us to implement easy
default values using lookup(key).value_or(default_value);
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The notable piece of code that remains to be converted is Ext2FS.
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A Lock can now be held either in shared or exclusive mode. Multiple threads can
hold the same lock in shared mode at one time, but if any thread holds the lock
in exclusive mode, no other thread can hold it at the same time in either mode.
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The next commit is going to make it bigger again by increasing the size of Lock,
so make use of bitfields to make sure FileDescription still fits into 64 bytes,
and so can still be allocated with the SlabAllocator.
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