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console
https://opam.ocaml.org/packages/ctypes/ 
$ opam install ctypes ctypes-foreign

main.ml
... 
let sigemptyset = foreign "sigemptyset" (ptr sigset_t @-> returning int)
let sigfillset = foreign "sigfillset" (ptr sigset_t @-> returning int)
let sigaddset = foreign "sigaddset" (ptr sigset_t @-> int @-> returning int)
let sigdelset = foreign "sigdelset" (ptr sigset_t @-> int @-> returning int)
let sigismember = foreign "sigismember" (ptr sigset_t @-> int @-> returning int)
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