module syscalld; version(Posix): @system: version(D_InlineAsm_X86_64) { version(linux) public import syscalld.os.linux_x86_64; else version(OSX) public import syscalld.os.osx_x86_64; else version(FreeBSD) public import syscalld.os.freebsd_x86_64; public import syscalld.arch.syscall_x86_64; } else version(D_InlineAsm_X86) { version(linux) public import syscalld.os.linux_x86; public import syscalld.arch.syscall_x86; } unittest { static if (__traits(compiles, syscall(GETPID))) assert(syscall(GETPID) > 0); else static assert(false, "Not supported on your platform/architecture."); }