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Previously, xmobar would ignore SIGCHLD, but only when the configuration
is recompiled. This means child processes would not leave zombies, so
that waiting for them to exit (either directly by calling
waitForProcess, or indirectly through another function from
System.Process, like system or readProcessWithExitCode) would produce an
error. This breaks the Alsa, Com (#657) and NotmuchMail plugins, as well
as the <action> tag (#687) and low battery action (#688).
As far as I can tell, bracketing the recompilation in
uninstallSignalHandlers and installSignalHandlers was inherited from
xmonad. In xmonad, SIGPIPE and SIGCHLD are always ignored
(installSignalHandlers is called at the start of xmonad and launch), so
the bracket is necessary to be able to wait for the compiler or build
script to exit. Since xmobar does not otherwise ignore the signals, it
is not necessary to change signal handlers at all during recompilation.
Removing it leaves the default action for SIGCHLD, which fixes the
issues described above.
Fixes #657, #687 and #688.
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Haskell libraries can be linked statically or dynamically. Either way, all packages must be linked the same way. This means that if all dependencies of `xmobar` are shared libraries, then `xmobar` itself must be built using dynamic linking.
Therefore, to compile the individual `xmobar` executables, add the `-dynamic` flag to signal that they are built with shared libraries.
This flag is put behind an #ifdef to easily configure static vs dynamic linking.
To use shared libraries, define SHARED_LIBRARIES
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The cpp option `-DRTSOPTS` results in `RTSOPTS` being defined.
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Write xmobar.errors to XMOBAR_DATA_DIR, not XMOBAR_CONFIG_DIR. This
allows XMOBAR_CONFIG_DIR to be read-only. This brings xmobar into
alignment with how xmonad manages its analogous directories (before this
change, a read-only DATA dir worked with xmonad but not with xmobar).
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Should take care of issue #371
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