Disable GDB with Swift 3

DisableGDB.swift

import Foundation

func disable_gdb() {
    let PT_DENY_ATTACH: CInt = 31
    let handle = dlopen("/usr/lib/libc.dylib", RTLD_NOW)
    let sym = dlsym(handle, "ptrace")
    typealias PtraceAlias = @convention(c) (CInt, pid_t, CInt, CInt) -> CInt
    let ptrace = unsafeBitCast(sym, to: PtraceAlias.self)
    _ = ptrace(PT_DENY_ATTACH, 0, 0, 0)
    dlclose(handle)
}