xserver/os/xserver_poll.c

1 /*---------------------------------------------------------------------------*\
6 	poll - select(2)-based poll() emulation function for BSD systems.
28 	of select() -- which is how this function is implemented.
31 	Stevens, W. Richard. Unix Network Programming.  Prentice-Hall, 1990.
39   http://opensource.org/licenses/bsd-license.php
41   Copyright (c) 1995-2011, Brian M. Clapper
69 \*---------------------------------------------------------------------------*/
72 /*---------------------------------------------------------------------------*\
74 \*---------------------------------------------------------------------------*/
77 #include <dix-config.h>
87 /*---------------------------------------------------------------------------*\
89 \*---------------------------------------------------------------------------*/
95 /*---------------------------------------------------------------------------*\
97 \*---------------------------------------------------------------------------*/
108     register int     max_fd = -1;            /* return value */  in map_poll_spec()
118         if (pCur->fd < 0)  in map_poll_spec()
121 	if (pCur->events & POLLIN)  in map_poll_spec()
124 	    FD_SET (pCur->fd, pReadSet);  in map_poll_spec()
127 	if (pCur->events & POLLOUT)  in map_poll_spec()
130 	    FD_SET (pCur->fd, pWriteSet);  in map_poll_spec()
133 	if (pCur->events & POLLPRI)  in map_poll_spec()
139 	    FD_SET (pCur->fd, pExceptSet);  in map_poll_spec()
142 	max_fd = MAX (max_fd, pCur->fd);  in map_poll_spec()
159        -1	wait indefinitely (until signal occurs)  in map_timeout()
170     switch (poll_timeout)  in map_timeout()
172 	case -1:  in map_timeout()
184 	    pSelTimeout->tv_sec  = 0;  in map_timeout()
185 	    pSelTimeout->tv_usec = 0;  in map_timeout()
191 	    pSelTimeout->tv_sec  = poll_timeout / 1000; /* get seconds */  in map_timeout()
193 	    pSelTimeout->tv_usec = poll_timeout * 1000; /* get microseconds */  in map_timeout()
216         if (pCur->fd < 0)  in map_select_results()
221 	pCur->revents = 0;  in map_select_results()
222 	if (FD_ISSET (pCur->fd, pExceptSet))  in map_select_results()
223 	    pCur->revents |= POLLPRI;  in map_select_results()
225 	else if (FD_ISSET (pCur->fd, pReadSet))  in map_select_results()
226 	    pCur->revents |= POLLIN;  in map_select_results()
228 	if (FD_ISSET (pCur->fd, pWriteSet))  in map_select_results()
229 	    pCur->revents |= POLLOUT;  in map_select_results()
235 /*---------------------------------------------------------------------------*\
237 \*---------------------------------------------------------------------------*/