604744f68d
The names array is terminated by a NULL entry, thus allocate space for one more than entries. Fixes: #844 ==6708==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6060000045b8 at pc 0x000000589ee1 bp 0x7ffcd1dee220 sp 0x7ffcd1dee218 READ of size 8 at 0x6060000045b8 thread T0 #0 0x589ee0 in String_freeArray ./XUtils.c:157:23 #1 0x56c9af in Settings_delete ./Settings.c:31:7 #2 0x4ee44b in CommandLine_run ./CommandLine.c:395:4 #3 0x4d6fb2 in main ./htop.c:15:11 #4 0x7ff3b8154e49 in __libc_start_main csu/../csu/libc-start.c:314:16 #5 0x428aa9 in _start (./htop+0x428aa9) 0x6060000045b8 is located 0 bytes to the right of 56-byte region [0x606000004580,0x6060000045b8) allocated by thread T0 here: #0 0x4a53f2 in __interceptor_calloc (./htop+0x4a53f2) #1 0x5890ba in xCalloc ./XUtils.c:55:17 #2 0x50a044 in Header_writeBackToSettings ./Header.c:148:34 #3 0x4de861 in Action_runSetup ./Action.c:91:7 #4 0x4de861 in actionSetup ./Action.c:386:4 #5 0x515caf in MainPanel_eventHandler ./MainPanel.c:106:19 #6 0x56a5c1 in ScreenManager_run ./ScreenManager.c:235:19 #7 0x4ee13b in CommandLine_run ./CommandLine.c:364:4 #8 0x4d6fb2 in main ./htop.c:15:11 #9 0x7ff3b8154e49 in __libc_start_main csu/../csu/libc-start.c:314:16
Introduction
htop is a cross-platform interactive process viewer.
htop allows scrolling the list of processes vertically and horizontally to see their full command lines and related information like memory and CPU consumption.
Also system wide information, like load average or swap usage, is shown.
The information displayed is configurable through a graphical setup and can be sorted and filtered interactively.
Tasks related to processes (e.g. killing and renicing) can be done without entering their PIDs.
Running htop requires ncurses libraries, typically named libncurses(w).
htop is written in C.
For more information and details visit htop.dev.
Build instructions
Prerequisite
List of build-time dependencies:
- standard GNU autotools-based C toolchain
- C99 compliant compiler
autoconfautotools
ncurses
Note about ncurses:
htoprequiresncurses6.0. Be aware the appropriate package is sometimes still called libncurses5 (on Debian/Ubuntu). Alsoncursesusually comes in two flavours:
- With Unicode support.
- Without Unicode support.
This is also something that is reflected in the package name on Debian/Ubuntu (via the additional 'w' - 'w'ide character support).
List of additional build-time dependencies (based on feature flags):
sensorshwloclibcap(v2.21 or later)libnl-3
Install these and other required packages for C development from your package manager.
Debian/Ubuntu
sudo apt install libncursesw5-dev autotools-dev autoconf build-essential
Fedora/RHEL
sudo dnf install ncurses-devel automake autoconf gcc
Compile from source:
To compile from source, download from the Git repository (git clone or downloads from GitHub releases), then run:
./autogen.sh && ./configure && make
Install
To install on the local system run make install. By default make install installs into /usr/local. To change this path use ./configure --prefix=/some/path.
Build Options
htop has several build-time options to enable/disable additional features.
Generic
--enable-unicode: enable Unicode support- dependency: libncursesw
- default: yes
--enable-affinity: enablesched_setaffinity(2)andsched_getaffinity(2)for affinity support; conflicts with hwloc- default: check
--enable-hwloc: enable hwloc support for CPU affinity; disables affinity support- dependency: libhwloc
- default: no
--enable-static: build a static htop binary; hwloc and delay accounting are not supported- default: no
--enable-debug: Enable asserts and internal sanity checks; implies a performance penalty- default: no
Performance Co-Pilot
--enable-pcp: enable Performance Co-Pilot support via a new pcp-htop utility- dependency: libpcp
- default: no
Linux
--enable-sensors: enable libsensors(3) support for reading temperature data- dependencies: libsensors-dev(build-time), at runtime libsensors is loaded via
dlopen(3)if available - default: check
- dependencies: libsensors-dev(build-time), at runtime libsensors is loaded via
--enable-capabilities: enable Linux capabilities support- dependency: libcap
- default: check
--with-proc: location of a Linux-compatible proc filesystem- default: /proc
--enable-openvz: enable OpenVZ support- default: no
--enable-vserver: enable VServer support- default: no
--enable-ancient-vserver: enable ancient VServer support (implies--enable-vserver)- default: no
--enable-delayacct: enable Linux delay accounting support- dependencies: pkg-config(build-time), libnl-3 and libnl-genl-3
- default: check
Runtime dependencies:
htop has a set of fixed minimum runtime dependencies, which is kept as minimal as possible:
ncurseslibraries for terminal handling (wide character support).
Runtime optional dependencies:
htop has a set of fixed optional dependencies, depending on build/configure option used:
Linux
libdl, if not building a static binary, is always required when support for optional dependencies (i.e.libsensors,libsystemd) is present.libcap, user-space interfaces to POSIX 1003.1e capabilities, is always required when--enable-capabilitieswas used to configurehtop.libsensors, readout of temperatures and CPU speeds, is optional even when--enable-sensorswas used to configurehtop.libsystemdis optional when--enable-staticwas not used to configurehtop. If building statically andlibsystemdis not found byconfigure, support for the systemd meter is disabled entirely.
htop checks for the availability of the actual runtime libraries as htop runs.
BSD
On most BSD systems kvm is a requirement to read kernel information.
More information on required and optional dependencies can be found in configure.ac.
Usage
See the manual page (man htop) or the help menu (F1 or h inside htop) for a list of supported key commands.
Support
If you have trouble running htop please consult your operating system / Linux distribution documentation for getting support and filing bugs.
Bugs, development feedback
We have a development mailing list. Feel free to subscribe for release announcements or asking questions on the development of htop.
You can also join our IRC channel #htop on Libera.Chat and talk to the developers there.
If you have found an issue within the source of htop, please check whether this has already been reported in our GitHub issue tracker.
If not, please file a new issue describing the problem you have found, the potential location in the source code you are referring to and a possible fix if available.
History
htop was invented, developed and maintained by Hisham Muhammad from 2004 to 2019. His legacy repository has been archived to preserve the history.
In 2020 a team took over the development amicably and continues to maintain htop collaboratively.
License
GNU General Public License, version 2 (GPL-2.0) or, at your option, any later version.