/* * File: xcompat.h * Version: 3.0 * Last modified on Thu Sep 22 15:52:24 1994 by eroberts * ----------------------------------------------------- * This interface exists entirely for portability with Unix systems * other than BSD 4.4, which is the assumed model for the rest of * the code.  To get the graphics library to run on other systems * (such as System V, POSIX, and so forth), the graphics library * approaches the portability problem by reimplementing the BSD * system calls and functions in terms of the corresponding * facilities on the target machine.  The advantage of this * approach is that the clients can work with only one model * that is relatively well understood. * * This interface has no effect unless one of the following macros * is defined: * *     HasPoll   -- Used if the System V poll call is available * * Additional conditionals may be added as new environments are * supported. */#ifndef _xcompat_h#define _xcompat_h#ifdef HasPoll#include <string.h>#ifndef FOPEN_MAX#  define FOPEN_MAX 128#endif#undef fd_set#undef FD_ZERO#undef FD_SET#undef FD_CLR#undef FD_ISSET#define fd_set fdSetT#define FD_ZERO(fdptr) (memset((fdptr)->fds, sizeof (fd_set), 0))#define FD_SET(fd, fdptr) ((fdptr)->fds[fd] = 1)#define FD_CLR(fd, fdptr) ((fdptr)->fds[fd] = 0)#define FD_ISSET(fd, fdptr) ((fdptr)->fds[fd])typedef struct {    char fds[FOPEN_MAX];} fdSetT;#define select SimulateSelectint SimulateSelect(int width,                   fd_set *readfds,                   fd_set *writefds,                   fd_set *exceptfds,                   struct timeval *tvp);#endif /* HasPoll */#endif