I am working on WinDRBD (https://github.com/LINBIT/windrbd) a port of the Linux DRBD driver to Microsoft Windows.
We want to run the user mode helper as a Windows Service (DRBD sometimes calls user space applications with call_usermodehelper(), which we emulate by a daemon that retrieves those request from the kernel driver, runs them and returns the exit status to the kernel).
When we run the daemon in a cygwin shell, everything works fine. However when running the daemon as a Windows Service it seems that cygwin cannot find its installation directory (which is C:\cygwin64 on my machines).
The registry entry (HKLM/Software/CygWin/setup/rootdir) points to the correct location, but I am not sure if it can also be accessed by the Windows Service?
/bin/sh isn't found by the service, however /cygdrive/c/cygwin64/bin/sh exists, so when I run the shell with that path it can start (and also finds the DLLs it requires to run). However shell complains with:
bash.exe: warning: could not find /tmp, please create!
which definitely exists when running cygwin the normal way.
Has anyone ever tried to run a CygWin compiled EXE as a Windows Service? Here is the output of sc query windrbdum:
SERVICE_NAME: windrbdum
TYPE : 10 WIN32_OWN_PROCESS
STATE : 4 RUNNING
(STOPPABLE, NOT_PAUSABLE, IGNORES_SHUTDOWN)
WIN32_EXIT_CODE : 0 (0x0)
SERVICE_EXIT_CODE : 0 (0x0)
CHECKPOINT : 0x0
WAIT_HINT : 0x0
(um is for user mode).
Thanks for any insights,
As matzeri pointed out, cygrunsrv is the cygwin tool when it comes to running cygwin binaries as a service under Windows. It serves both as a wrapper (that does the Windows specific service API and event handling) as well as a tool to install, remove, start and stop services (this can still be done with the sc utility like
sc start <servicename>
).
To install a service (I) do:
cygrunsrv.exe -I windrbdlog -p /cygdrive/c/windrbd/usr/sbin/windrbd.exe \
-a log-server \
-1 /cygdrive/c/windrbd/windrbd-kernel.log \
-2 /cygdrive/c/windrbd/windrbd-kernel.log
where windrbdlog is the Windows name of the service, /cygdrive ... is the full path to the cygwin application (no need to code any Windows Service API calls there, it's just a Cygwin/POSIX executable), log-server is the argument to the binary (so what is being started is windrbd log-server) and -1 and -2 are rediects for stdout and stderr. Exactly what I need, thanks to matzeri for pointing me to cygrunsrv.
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