It was quite easy to put the system into a heavy churn state by doing
e.g "cat /dev/zero".
It was then basically impossible to kill the "cat" process, even with
"kill -9", since signals are only delivered in two conditions:
a) The target thread is blocked in the kernel
b) The target thread is running in userspace
However, since "cat /dev/zero" command spends most of its time actively
running in the kernel, not blocked, the signal dispatch code just kept
postponing actually handling the signal indefinitely.
To fix this, we now check before returning from a syscall if there are
any pending unmasked signals, and if so, we take a dramatic pause by
blocking the current thread, knowing it will immediately be unblocked
by signal dispatch anyway. :^)
This patch makes it so that if a user provides a groupname/username
instead of an id, chown will automatically convert it to a gid/uid
using getgrnam() or getpwnam() respectively.
Now that the "unix" pledge is no longer required for socket I/O, we can
drop it after making the connections we need in a program.
In most GUI program cases, once we've connected to the WindowServer by
instantiating a GApplication, we no longer need "unix" :^)
When the current thread is backtracing itself, we now start walking the
stack from the current EBP register value, instead of the TSS one.
Now SystemMonitor always appears to be running Thread::backtrace() when
sampled, which makes perfect sense. :^)
If there is a current menu, we now redirect all key events from window
manager to the menu manager. This allows us to properly navigate a menu
even when there is a current menu open.
Menu key navigation is now a lot more pleasant to use :^)
The action of pressing escape to close a menu has also been moved to its
proper home in menu manager in this commit.
set_current_menu() was indiscriminately closing all menus when the
current menu is not a submenu. We should only close menus not in lineage
to the one being closed.
We were forgetting to update the current menu when switching to a new
item.
We also rename the function from implying that only a redraw is
happening, as is actually not the case. It is now more correctly named:
update_for_new_hovered_item()
This patch makes it so that if the find/replace widget is opened while
some text is selected, the find textbox's content is overrided with the
selected text.
This patch adds a new replace widget that cooperates with the find
widget, the replace widget takes the input in the find textbox, searches
for occurences of that input, and replaces them with the input provied
in the replace textbox.
