newlib-cygwin/winsup/cygwin/poll.cc

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/* poll.cc. Implements poll(2) via usage of select(2) call.
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Copyright 2000, 2001 Red Hat, Inc.
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 "winsup.h"
#include <sys/time.h>
#include <sys/poll.h>
#include <errno.h>
#include <stdlib.h>
#include "security.h"
#include "fhandler.h"
Add "path.h" include throughout, where needed. Use new path_conv methods and operators to simplify testing for directory and attributes, throughout. * path.h (path_conv::exists): New method. (path_conv::has_attribute): Ditto. (path_conv::isdir): Ditto. (path_conv::DWORD &): New operator. (path_conv::int &): Ditto. * dir.cc (rmdir): Eliminate a goto. * dtable.cc (dtable::build_fhandler): Accept opt and suffix info for path_conv.check. Return fh == NULL on path_conv error. Pass unit to set_name as appropriate. (dtable::reset_unix_path_name): New method. * dtable.h (dtable): Declare new method. Reflect arg changes to build_fhandler. * fhandler.cc (fhandler_disk_dummy_name): Eliminate. (fhandler_base::set_name): Expect paths to be NULL. Build unix_path_name from win32_path_name when it is a device. (fhandler_base::reset_unix_path_name): New method. (fhandler_base::raw_read): Report EISDIR when ERROR_INVALID_FUNCTION or ERROR_INVALID_PARAMETER and reading a directory. (fhandler_disk_file::fstat): Don't call stat_dev since we should now never be calling fhandler_disk_file methods with devices. (fhandler_base::fhandler_base): Clear {unix,win32}_path_name. (fhandler_base::~fhandler_base): Always free {unix,win32}_path_name. (fhandler_disk_file::fhandler_disk_file): Remove set_no_free_names kludge. (fhandler_disk_file::open): Ditto. * fhandler.h (fhandler_base::no_free_names): Eliminate. (fhandler_base::set_no_free_names): Ditto. * fhandler_tty.cc (fhandler_tty_slave::fhandler_tty_slave): Don't set unix_path_name here. * path.cc (fchdir): Lock fd table throughout. Use new dtable::reset_unix_path_name method to reset path. * syscalls.cc (stat_worker): Reorganize to always call fstat method. Pass path_conv method to fhandler_*::open. (chroot): Elminate a goto.
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#include "path.h"
#include "dtable.h"
#include "cygerrno.h"
#include "cygheap.h"
#include "sigproc.h"
extern "C"
int
poll (struct pollfd *fds, unsigned int nfds, int timeout)
{
int max_fd = 0;
fd_set *read_fds, *write_fds, *except_fds;
struct timeval tv = { timeout / 1000, (timeout % 1000) * 1000 };
sigframe thisframe (mainthread);
for (unsigned int i = 0; i < nfds; ++i)
if (fds[i].fd > max_fd)
max_fd = fds[i].fd;
size_t fds_size = howmany(max_fd + 1, NFDBITS) * sizeof (fd_mask);
read_fds = (fd_set *) alloca (fds_size);
write_fds = (fd_set *) alloca (fds_size);
except_fds = (fd_set *) alloca (fds_size);
if (!read_fds || !write_fds || !except_fds)
{
set_errno (ENOMEM);
return -1;
}
memset (read_fds, 0, fds_size);
memset (write_fds, 0, fds_size);
memset (except_fds, 0, fds_size);
int invalid_fds = 0;
for (unsigned int i = 0; i < nfds; ++i)
{
fds[i].revents = 0;
if (!cygheap->fdtab.not_open(fds[i].fd))
{
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);
}
else if (fds[i].fd >= 0)
{
++invalid_fds;
fds[i].revents = POLLNVAL;
}
}
if (invalid_fds)
return invalid_fds;
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 (fds[i].fd >= 0)
{
if (cygheap->fdtab.not_open(fds[i].fd))
fds[i].revents = POLLHUP;
else
{
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, read_fds) && FD_ISSET(fds[i].fd, write_fds))
fds[i].revents |= POLLERR;
if (FD_ISSET(fds[i].fd, except_fds))
fds[i].revents |= POLLPRI;
}
}
}
return ret;
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}