The system curses library can handle terminal size changes with
SIGWINCH without asking system calls to restart, which effectively
stops system calls with -1 and EINTR. An example is ncurses on
Linux systems.
One of these system calls is waitpid. While waiting for the lsof child
to complete, a badly timed SIGWINCH can interrupt the waitpid call,
effectively never clearing the state of the child, keeping the zombie
until htop exits.
Proof of Concept:
#include <unistd.h>
int main(void) {
close(1); close(2);
sleep(5);
return 0;
}
Compile this as a replacement "lsof" and put it into your path. Make
sure that it's called instead of the real lsof.
Press "l" to list open files and resize your terminal within the next
5 seconds. You will see that a zombie process is kept by htop when the
timeout finishes.
The parent process of htop might have set SIGCHLD to ignore, which can
be inherited by htop (Linux does this, OpenBSD resets to default).
If SIGCHLD is ignored then waitpid returns -1 which is not properly
handled by htop for lsof output.
Proof of Concept (Linux):
#include <signal.h>
#include <unistd.h>
int main(void) {
char *arg[] = { "htop", NULL };
signal(SIGCHLD, SIG_IGN);
execv("htop", arg);
return 1;
}
If you run htop with ignored SIGCHLD then pressing "l" always fails,
i.e. it is not possible to list open files even if lsof is installed.
It is possible to exceed the unsigned int data type on 64 bit systems
with enough available RAM. Use size_t in all places instead.
Proof of Concept: Create a 4 GB line in .htoprc file and run htop
$ dd if=/dev/zero bs=1024 count=4194304 | tr '\0' 'a' > ~/.htoprc
$ htop
Segmentation fault
Also avoid overflow of stack based "match" array in String_getToken.
Formatting the merged command string is now implemented in an platform
independent way. Drop the Process member getCommandStr designed for
overrides of individual platforms.
When reading a configuration file with the syntax previous to the
screens update Settings_defaultScreens() will add the default fields and
later ScreenSettings_readFields() will add the ones from the
configuration file. This will duplicate some fields and corrupt the
columns due to the boundless Command field.
The libunwind headers of LLVM are located in the subdirectory
/usr/include/libunwind. Search that subdirectory when the default
header test fails. Also extend the include path due to the transitive
include of `<__libunwind_config.h>`.
Closes: #894
With a size of 2 or 3 the grow factor does not reach 70% for one empty
entry. This will cause the following assert violation:
htop: Hashtable.c:236: void Hashtable_put(Hashtable *, ht_key_t, void *): Assertion `this->size > this->items' failed.
Due to the use of prime numbers Hashtable_remove used to never shrink
from some sizes. For example, a size 8191 hashtable would try to shrink
to 4095, which nextPrime would round back to 8191 instead of the
intended 4093. A factor of 3 is enough to allow every prime size used to
shrink to the previous one.
Not all batteries entries in /sys/class/power_supply start with either
BAT or AC, but might have device specific names, e.g. CMB1.
Detect the types of those entries and parse them accordingly.
Closes: #881
Fixes: 3e70de64 ("Code clean up for reading battery info")
Show a non highlighted string at the start of htop, not the failure
text.
Also the original fix only handled the text mode, not the bar mode.
Improves: 2977414d ("Discard stale information from DiskIO and NetworkIO meters")
Related: #860
Use C99 struct initialization, which also makes using calloc redundant.
htop: Process.c:1179: int Process_compareByKey_Base(const Process *, const Process *, ProcessField): Assertion `0 && "Process_compareByKey_Base: default key reached"' failed.
If the new htop is configured with htoprc having no tabs (eg on upgrade)
then the interface will not automatically introduce/enable them.
However, for a fresh install of htop, enabling them automatically
Signed-off-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Commit d8dfbbd3 ("Tidy up process state handling") did change the
highlighting of the UNINTERRUPTIBLE_WAIT state (D) from red to gray.
As this state might means the process probably still has work to do and
can hint at bottlenecks, revert this particular change.
Fixes: d8dfbbd3 ("Tidy up process state handling")
Do not underflow count at the last iteration, which triggers UBSAN when
using -fsanitize=unsigned-integer-overflow. This is useful as those
underflows can be a result of a flawed counting logic (e.g. a counter
gets reduced more than increased).
When we close the application using the quit function F10, the last line
is cleared so that on terminals which do not support ALTBUF the last
line is not clobbered. This do not happen when the application exits as
a result of a signal (SIGINT,SIGTERM,SIGQUIT).
Move the logic to clear the last line into the CRT_done function. This
ensures that it will be executed when the CRT_handleSIGTERM is called.
Tobias Stoeckmann