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# Handling Operating System Variation

When writing cross-platform applications or libraries, it is often necessary to allow for
differences between operating systems. The variable Sys.KERNEL can be used to handle such
cases. There are several functions in the Sys module intended to make this easier:
isunix, islinux, isapple, isbsd, and iswindows. These may be used as follows:

if Sys.iswindows()

Note that `islinux` and `isapple` are mutually exclusive subsets of `isunix`. Additionally,
there is a macro `@static` which makes it possible to use these functions to conditionally hide
invalid code, as demonstrated in the following examples.

Simple blocks:

ccall((@static Sys.iswindows() ? :_fopen : :fopen), ...)

Complex blocks:

@static if Sys.islinux()

When chaining conditionals (including if/elseif/end), the @static must be repeated for
each level (parentheses optional, but recommended for readability):

@static Sys.iswindows() ? :a : (@static Sys.isapple() ? :b : :c)