PBD_API ssize_t PBD_APICALLTYPE pread(int handle, void *buf, size_t nbytes, off_t offset);
PBD_API ssize_t PBD_APICALLTYPE pwrite(int handle, const void *buf, size_t nbytes, off_t offset);
PBD_API int PBD_APICALLTYPE poll(struct pollfd *fds, nfds_t nfds, int timeout);
+PBD_API double PBD_APICALLTYPE round(double x);
namespace PBD {