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When forkExec is called it begins to ignore all SIGCHLD signals for the rest of the progam's execution so that they are automatically reaped. However, this means that subsequent waitpid calls in the exec function will always fail. So instead handle SIGCHLD by reaping any processes created by forkExec and ignoring all others so that they can be handled directly by the exec function.
Waybar 
Highly customizable Wayland bar for Sway and Wlroots based compositors.
Available in Arch community or AUR, openSUSE, and Alpine Linux
Waybar examples
Current features
- Sway (Workspaces, Binding mode, Focused window name)
- Tray #21
- Local time
- Battery
- Network
- Bluetooth
- Pulseaudio
- Disk
- Memory
- Cpu load average
- Temperature
- MPD
- Custom scripts
- Multiple output configuration
- And much more customizations
Configuration and Styling
See the wiki for more details.
How to build
$ git clone https://github.com/Alexays/Waybar
$ cd Waybar
$ meson build
$ ninja -C build
$ ./build/waybar
# If you want to install it
$ ninja -C build install
$ waybar
Dependencies
gtkmm3
jsoncpp
libsigc++
fmt
wayland
chrono-date
spdlog
libgtk-3-dev [gtk-layer-shell]
gobject-introspection [gtk-layer-shell]
libgirepository1.0-dev [gtk-layer-shell]
libpulse [Pulseaudio module]
libnl [Network module]
libappindicator-gtk3 [Tray module]
libdbusmenu-gtk3 [Tray module]
libmpdclient [MPD module]
Build dependencies
cmake
meson
scdoc
wayland-protocols
On Ubuntu you can install all the relevant dependencies using this command (tested with 19.10 and 20.04):
sudo apt install \
clang-tidy \
gobject-introspection \
libdbusmenu-gtk3-dev \
libfmt-dev \
libgirepository1.0-dev \
libgtk-3-dev \
libgtkmm-3.0-dev \
libinput-dev \
libjsoncpp-dev \
libmpdclient-dev \
libnl-3-dev \
libnl-genl-3-dev \
libpulse-dev \
libsigc++-2.0-dev \
libspdlog-dev \
libwayland-dev \
scdoc
Contributions welcome! - have fun :)
The style guidelines is Google's
License
Waybar is licensed under the MIT license. See LICENSE for more information.