64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
|
/* poll.cc. Implements poll(2) via usage of select(2) call.
|
||
|
|
|
||
|
|
Copyright 2000 Cygnus Solutions.
|
||
|
|
|
||
|
|
This file is part of Cygwin.
|
||
|
|
|
||
|
|
This software is a copyrighted work licensed under the terms of the
|
||
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
||
|
|
details. */
|
||
|
|
|
||
|
|
#include <sys/poll.h>
|
||
|
|
#include "winsup.h"
|
||
|
|
|
||
|
|
extern "C"
|
||
|
|
int
|
||
|
|
poll (struct pollfd *fds, unsigned int nfds, int timeout)
|
||
|
|
{
|
||
|
|
int max_fd = 0;
|
||
|
|
fd_set open_fds, read_fds, write_fds, except_fds;
|
||
|
|
struct timeval tv = { timeout / 1000, (timeout % 1000) * 1000 };
|
||
|
|
|
||
|
|
FD_ZERO (&read_fds);
|
||
|
|
FD_ZERO (&write_fds);
|
||
|
|
FD_ZERO (&except_fds);
|
||
|
|
|
||
|
|
for (unsigned int i = 0; i < nfds; ++i)
|
||
|
|
if (!dtable.not_open (fds[i].fd))
|
||
|
|
{
|
||
|
|
FD_SET (fds[i].fd, &open_fds);
|
||
|
|
if (fds[i].events & POLLIN)
|
||
|
|
FD_SET (fds[i].fd, &read_fds);
|
||
|
|
if (fds[i].events & POLLOUT)
|
||
|
|
FD_SET (fds[i].fd, &write_fds);
|
||
|
|
if (fds[i].events & POLLPRI)
|
||
|
|
FD_SET (fds[i].fd, &except_fds);
|
||
|
|
if (fds[i].fd > max_fd)
|
||
|
|
max_fd = fds[i].fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ret = cygwin_select (max_fd + 1, &read_fds, &write_fds, &except_fds,
|
||
|
|
timeout < 0 ? NULL : &tv);
|
||
|
|
|
||
|
|
if (ret >= 0)
|
||
|
|
for (unsigned int i = 0; i < nfds; ++i)
|
||
|
|
{
|
||
|
|
if (!FD_ISSET (fds[i].fd, &open_fds))
|
||
|
|
fds[i].revents = POLLNVAL;
|
||
|
|
else if (dtable.not_open(fds[i].fd))
|
||
|
|
fds[i].revents = POLLHUP;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fds[i].revents = 0;
|
||
|
|
if (!FD_ISSET (fds[i].fd, &read_fds))
|
||
|
|
fds[i].revents |= POLLIN;
|
||
|
|
if (!FD_ISSET (fds[i].fd, &write_fds))
|
||
|
|
fds[i].revents |= POLLOUT;
|
||
|
|
if (!FD_ISSET (fds[i].fd, &except_fds))
|
||
|
|
fds[i].revents |= POLLPRI;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|