1 /* gpoll.h - poll(2) support 2 * Copyright (C) 2008 Red Hat, Inc. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public 15 * License along with this library; if not, write to the 16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 17 * Boston, MA 02111-1307, USA. 18 */ 19 20 #if !defined (__GLIB_H_INSIDE__) && !defined (__G_MAIN_H__) && !defined (GLIB_COMPILATION) 21 #error "Only <glib.h> can be included directly." 22 #endif 23 24 #ifndef __G_POLL_H__ 25 #define __G_POLL_H__ 26 27 #include <glib/gtypes.h> 28 29 G_BEGIN_DECLS 30 31 /* Any definitions using GPollFD or GPollFunc are primarily 32 * for Unix and not guaranteed to be the compatible on all 33 * operating systems on which GLib runs. Right now, the 34 * GLib does use these functions on Win32 as well, but interprets 35 * them in a fairly different way than on Unix. If you use 36 * these definitions, you are should be prepared to recode 37 * for different operating systems. 38 * 39 * Note that on systems with a working poll(2), that function is used 40 * in place of g_poll(). Thus g_poll() must have the same signature as 41 * poll(), meaning GPollFD must have the same layout as struct pollfd. 42 * 43 * 44 * On Win32, the fd in a GPollFD should be Win32 HANDLE (*not* a file 45 * descriptor as provided by the C runtime) that can be used by 46 * MsgWaitForMultipleObjects. This does *not* include file handles 47 * from CreateFile, SOCKETs, nor pipe handles. (But you can use 48 * WSAEventSelect to signal events when a SOCKET is readable). 49 * 50 * On Win32, fd can also be the special value G_WIN32_MSG_HANDLE to 51 * indicate polling for messages. 52 * 53 * But note that G_WIN32_MSG_HANDLE GPollFDs should not be used by GDK 54 * (GTK) programs, as GDK itself wants to read messages and convert them 55 * to GDK events. 56 * 57 * So, unless you really know what you are doing, it's best not to try 58 * to use the main loop polling stuff for your own needs on 59 * Windows. 60 */ 61 typedef struct _GPollFD GPollFD; 62 typedef gint (*GPollFunc) (GPollFD *ufds, 63 guint nfsd, 64 gint timeout_); 65 66 struct _GPollFD 67 { 68 #if defined (G_OS_WIN32) && GLIB_SIZEOF_VOID_P == 8 69 gint64 fd; 70 #else 71 gint fd; 72 #endif 73 gushort events; 74 gushort revents; 75 }; 76 77 #ifdef G_OS_WIN32 78 #if GLIB_SIZEOF_VOID_P == 8 79 #define G_POLLFD_FORMAT "%#I64x" 80 #else 81 #define G_POLLFD_FORMAT "%#x" 82 #endif 83 #else 84 #define G_POLLFD_FORMAT "%d" 85 #endif 86 87 gint g_poll (GPollFD *fds, 88 guint nfds, 89 gint timeout); 90 91 G_END_DECLS 92 93 #endif /* __G_POLL_H__ */ 94
