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128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/* gpoll.h - poll(2) support
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* Copyright (C) 2008 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __G_POLL_H__
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#define __G_POLL_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (__G_MAIN_H__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gtypes.h>
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G_BEGIN_DECLS
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/* Any definitions using GPollFD or GPollFunc are primarily
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* for Unix and not guaranteed to be the compatible on all
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* operating systems on which GLib runs. Right now, the
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* GLib does use these functions on Win32 as well, but interprets
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* them in a fairly different way than on Unix. If you use
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* these definitions, you are should be prepared to recode
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* for different operating systems.
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*
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* Note that on systems with a working poll(2), that function is used
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* in place of g_poll(). Thus g_poll() must have the same signature as
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* poll(), meaning GPollFD must have the same layout as struct pollfd.
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*
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* On Win32, the fd in a GPollFD should be Win32 HANDLE (*not* a file
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* descriptor as provided by the C runtime) that can be used by
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* MsgWaitForMultipleObjects. This does *not* include file handles
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* from CreateFile, SOCKETs, nor pipe handles. (But you can use
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* WSAEventSelect to signal events when a SOCKET is readable).
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*
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* On Win32, fd can also be the special value G_WIN32_MSG_HANDLE to
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* indicate polling for messages.
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*
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* But note that G_WIN32_MSG_HANDLE GPollFDs should not be used by GDK
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* (GTK) programs, as GDK itself wants to read messages and convert them
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* to GDK events.
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*
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* So, unless you really know what you are doing, it's best not to try
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* to use the main loop polling stuff for your own needs on
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* Windows.
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*/
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typedef struct _GPollFD GPollFD;
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/**
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* GPollFunc:
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* @ufds: an array of #GPollFD elements
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* @nfsd: the number of elements in @ufds
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* @timeout_: the maximum time to wait for an event of the file descriptors.
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* A negative value indicates an infinite timeout.
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*
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* Specifies the type of function passed to g_main_context_set_poll_func().
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* The semantics of the function should match those of the poll() system call.
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*
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* Returns: the number of #GPollFD elements which have events or errors
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* reported, or -1 if an error occurred.
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*/
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typedef gint (*GPollFunc) (GPollFD *ufds,
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guint nfsd,
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gint timeout_);
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/**
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* GPollFD:
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* @fd: the file descriptor to poll (or a HANDLE on Win32)
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* @events: a bitwise combination from #GIOCondition, specifying which
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* events should be polled for. Typically for reading from a file
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* descriptor you would use %G_IO_IN | %G_IO_HUP | %G_IO_ERR, and
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* for writing you would use %G_IO_OUT | %G_IO_ERR.
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* @revents: a bitwise combination of flags from #GIOCondition, returned
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* from the poll() function to indicate which events occurred.
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*
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* Represents a file descriptor, which events to poll for, and which events
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* occurred.
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*/
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struct _GPollFD
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{
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#if defined (G_OS_WIN32) && GLIB_SIZEOF_VOID_P == 8
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#ifndef __GTK_DOC_IGNORE__
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gint64 fd;
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#endif
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#else
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gint fd;
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#endif
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gushort events;
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gushort revents;
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};
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/**
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* G_POLLFD_FORMAT:
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*
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* A format specifier that can be used in printf()-style format strings
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* when printing the @fd member of a #GPollFD.
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*/
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#ifdef G_OS_WIN32
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#if GLIB_SIZEOF_VOID_P == 8
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#define G_POLLFD_FORMAT "%#I64x"
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#else
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#define G_POLLFD_FORMAT "%#x"
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#endif
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#else
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#define G_POLLFD_FORMAT "%d"
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#endif
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GLIB_AVAILABLE_IN_ALL
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gint
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g_poll (GPollFD *fds,
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guint nfds,
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gint timeout);
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G_END_DECLS
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#endif /* __G_POLL_H__ */
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