winsup/cygwin/select.h

   1 /* select.h
   2
   3    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4    2005, 2006, 2007, 2008, 2009, 2010 Red Hat, Inc.
   5
   6 This file is part of Cygwin.
   7
   8 This software is a copyrighted work licensed under the terms of the
   9 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
  10 details. */
  11
  12 #ifndef _SELECT_H_
  13 #define _SELECT_H_
  14
  15 struct select_record
  16 {
  17   int fd;
  18   HANDLE h;
  19   fhandler_base *fh;
  20   int thread_errno;
  21   bool windows_handle;
  22   bool read_ready, write_ready, except_ready;
  23   bool read_selected, write_selected, except_selected;
  24   bool except_on_write;
  25   int (*startup) (select_record *me, class select_stuff *stuff);
  26   int (*peek) (select_record *, bool);
  27   int (*verify) (select_record *me, fd_set *readfds, fd_set *writefds,
  28                  fd_set *exceptfds);
  29   void (*cleanup) (select_record *me, class select_stuff *stuff);
  30   struct select_record *next;
  31   void set_select_errno () {__seterrno (); thread_errno = errno;}
  32   int saw_error () {return thread_errno;}
  33   select_record () {}
  34   select_record (int): fd (0), h (NULL), fh (NULL), thread_errno (0),
  35     windows_handle (false), read_ready (false), write_ready (false),
  36     except_ready (false), read_selected (false), write_selected (false),
  37     except_selected (false), except_on_write (false),
  38     startup (NULL), peek (NULL), verify (NULL), cleanup (NULL),
  39     next (NULL) {}
  40 };
  41
  42 struct select_info
  43 {
  44   cygthread *thread;
  45   bool stop_thread;
  46   select_record *start;
  47   select_info () {}
  48 };
  49
  50 struct select_pipe_info: public select_info
  51 {
  52 };
  53
  54 struct select_socket_info: public select_info
  55 {
  56   int num_w4;
  57   LONG *ser_num;
  58   HANDLE *w4;
  59 };
  60
  61 struct select_serial_info: public select_info
  62 {
  63 };
  64
  65 struct select_mailslot_info: public select_info
  66 {
  67 };
  68
  69 class select_stuff
  70 {
  71 public:
  72   ~select_stuff ();
  73   bool always_ready, windows_used;
  74   select_record start;
  75
  76   select_pipe_info *device_specific_pipe;
  77   select_socket_info *device_specific_socket;
  78   select_serial_info *device_specific_serial;
  79   select_mailslot_info *device_specific_mailslot;
  80
  81   bool test_and_set (int i, fd_set *readfds, fd_set *writefds,
  82                      fd_set *exceptfds);
  83   int poll (fd_set *readfds, fd_set *writefds, fd_set *exceptfds);
  84   int wait (fd_set *readfds, fd_set *writefds, fd_set *exceptfds, DWORD ms);
  85   void cleanup ();
  86   void destroy ();
  87   select_stuff (): always_ready (0), windows_used (0), start (0),
  88                    device_specific_pipe (0),
  89                    device_specific_socket (0),
  90                    device_specific_serial (0),
  91                    device_specific_mailslot (0) {}
  92 };
  93 #endif /* _SELECT_H_ */