Add #ifdef guards around UI_GET_SYSNAME #218
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If the C code is built with a kernel header that does not provide UI_GET_SYSNAME, then ui_get_sysname() will always raise OSError. (Unless incorrect arguments are provided to the function, in which case the function still behaves as it otherwise would.)
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The Python code is already ready to deal with
uinput_get_sysname()throwing OSError in case the ioctlUI_GET_SYSNAMEis not available, but it turns out that the C object code refuses to link if the macroUI_GET_SYSNAMEwas not defined at build time, because the compiler assumes thatUI_GET_SYSNAMEis a symbol that will be defined later at link time. (Issue #178)Add an
#ifdefguard around the code that relies onUI_GET_SYSNAMEso that no reference to any hypothetical symbolUI_GET_SYSNAMEremains in the object code if theUI_GET_SYSNAMEmacro was undefined at build time. This will causeuinput_get_sysname()to raise OSError if theUI_GET_SYSNAMEwas not defined at build time.