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libc/winsup/cygwin/select.cc

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/* select.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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. */
/* The following line means that the BSD socket definitions for
fd_set, FD_ISSET etc. are used in this file. */
#define __INSIDE_CYGWIN_NET__
#include "winsup.h"
#include <stdlib.h>
#include <sys/param.h>
#include "ntdll.h"
#include <wingdi.h>
#include <winuser.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock2.h>
#include <netdb.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "select.h"
#include "dtable.h"
#include "cygheap.h"
#include "pinfo.h"
#include "sigproc.h"
#include "cygtls.h"
#include "cygwait.h"
/*
* All these defines below should be in sys/types.h
* but because of the includes above, they may not have
* been included. We create special UNIX_xxxx versions here.
*/
#ifndef NBBY
#define NBBY 8 /* number of bits in a byte */
#endif /* NBBY */
/*
* Select uses bit masks of file descriptors in longs.
* These macros manipulate such bit fields (the filesystem macros use chars).
* FD_SETSIZE may be defined by the user, but the default here
* should be >= NOFILE (param.h).
*/
typedef long fd_mask;
#define UNIX_NFDBITS (sizeof (fd_mask) * NBBY) /* bits per mask */
#ifndef unix_howmany
#define unix_howmany(x,y) (((x)+((y)-1))/(y))
#endif
#define unix_fd_set fd_set
#define NULL_fd_set ((fd_set *) NULL)
#define sizeof_fd_set(n) \
((unsigned) (NULL_fd_set->fds_bits + unix_howmany ((n), UNIX_NFDBITS)))
#define UNIX_FD_SET(n, p) \
((p)->fds_bits[(n)/UNIX_NFDBITS] |= (1L << ((n) % UNIX_NFDBITS)))
#define UNIX_FD_CLR(n, p) \
((p)->fds_bits[(n)/UNIX_NFDBITS] &= ~(1L << ((n) % UNIX_NFDBITS)))
#define UNIX_FD_ISSET(n, p) \
((p)->fds_bits[(n)/UNIX_NFDBITS] & (1L << ((n) % UNIX_NFDBITS)))
#define UNIX_FD_ZERO(p, n) \
memset ((caddr_t) (p), 0, sizeof_fd_set ((n)))
#define allocfd_set(n) ({\
size_t __sfds = sizeof_fd_set (n) + 8; \
void *__res = alloca (__sfds); \
memset (__res, 0, __sfds); \
(fd_set *) __res; \
})
#define copyfd_set(to, from, n) memcpy (to, from, sizeof_fd_set (n));
#define set_handle_or_return_if_not_open(h, s) \
h = (s)->fh->get_handle (); \
if (cygheap->fdtab.not_open ((s)->fd)) \
{ \
(s)->thread_errno = EBADF; \
return -1; \
}
static int select (int, fd_set *, fd_set *, fd_set *, DWORD);
/* The main select code. */
extern "C" int
cygwin_select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *to)
{
select_printf ("select(%d, %p, %p, %p, %p)", maxfds, readfds, writefds, exceptfds, to);
pthread_testcancel ();
int res;
if (maxfds < 0)
{
set_errno (EINVAL);
res = -1;
}
else
{
/* Convert to milliseconds or INFINITE if to == NULL */
DWORD ms = to ? (to->tv_sec * 1000) + (to->tv_usec / 1000) : INFINITE;
if (ms == 0 && to->tv_usec)
ms = 1; /* At least 1 ms granularity */
if (to)
select_printf ("to->tv_sec %d, to->tv_usec %d, ms %d", to->tv_sec, to->tv_usec, ms);
else
select_printf ("to NULL, ms %x", ms);
res = select (maxfds, readfds ?: allocfd_set (maxfds),
writefds ?: allocfd_set (maxfds),
exceptfds ?: allocfd_set (maxfds), ms);
}
syscall_printf ("%R = select(%d, %p, %p, %p, %p)", res, maxfds, readfds,
writefds, exceptfds, to);
return res;
}
/* This function is arbitrarily split out from cygwin_select to avoid odd
gcc issues with the use of allocfd_set and improper constructor handling
for the sel variable. */
static int
select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
DWORD ms)
{
int res = select_stuff::select_loop;
LONGLONG start_time = gtod.msecs (); /* Record the current time for later use. */
select_stuff sel;
sel.return_on_signal = 0;
/* Allocate some fd_set structures using the number of fds as a guide. */
fd_set *r = allocfd_set (maxfds);
fd_set *w = allocfd_set (maxfds);
fd_set *e = allocfd_set (maxfds);
while (res == select_stuff::select_loop)
{
/* Build the select record per fd linked list and set state as
needed. */
for (int i = 0; i < maxfds; i++)
if (!sel.test_and_set (i, readfds, writefds, exceptfds))
{
select_printf ("aborting due to test_and_set error");
return -1; /* Invalid fd, maybe? */
}
select_printf ("sel.always_ready %d", sel.always_ready);
/* Degenerate case. No fds to wait for. Just wait for time to run out
or signal to arrive. */
if (sel.start.next == NULL)
switch (cygwait (ms))
{
case WAIT_SIGNALED:
select_printf ("signal received");
if (_my_tls.call_signal_handler ())
res = select_stuff::select_loop; /* Emulate linux behavior */
else
{
set_sig_errno (EINTR);
res = select_stuff::select_error;
}
break;
case WAIT_CANCELED:
sel.destroy ();
pthread::static_cancel_self ();
/*NOTREACHED*/
default:
res = select_stuff::select_set_zero; /* Set res to zero below. */
break;
}
else if (sel.always_ready || ms == 0)
res = 0; /* Catch any active fds via
sel.poll() below */
else
res = sel.wait (r, w, e, ms); /* wait for an fd to become
become active or time out */
select_printf ("res %d", res);
if (res >= 0)
{
copyfd_set (readfds, r, maxfds);
copyfd_set (writefds, w, maxfds);
copyfd_set (exceptfds, e, maxfds);
/* Actually set the bit mask from sel records */
res = (res == select_stuff::select_set_zero) ? 0 : sel.poll (readfds, writefds, exceptfds);
}
/* Always clean up everything here. If we're looping then build it
all up again. */
sel.cleanup ();
sel.destroy ();
/* Recalculate the time remaining to wait if we are going to be looping. */
if (res == select_stuff::select_loop && ms != INFINITE)
{
select_printf ("recalculating ms");
LONGLONG now = gtod.msecs ();
if (now > (start_time + ms))
{
select_printf ("timed out after verification");
res = 0;
}
else
{
ms -= (now - start_time);
start_time = now;
select_printf ("ms now %u", ms);
}
}
}
if (res < -1)
res = -1;
return res;
}
extern "C" int
pselect(int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
const struct timespec *ts, const sigset_t *set)
{
struct timeval tv;
sigset_t oldset = _my_tls.sigmask;
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (ts)
{
tv.tv_sec = ts->tv_sec;
tv.tv_usec = ts->tv_nsec / 1000;
}
if (set)
set_signal_mask (_my_tls.sigmask, *set);
int ret = cygwin_select (maxfds, readfds, writefds, exceptfds,
ts ? &tv : NULL);
if (set)
set_signal_mask (_my_tls.sigmask, oldset);
return ret;
}
/* Call cleanup functions for all inspected fds. Gets rid of any
executing threads. */
void
select_stuff::cleanup ()
{
select_record *s = &start;
select_printf ("calling cleanup routines");
while ((s = s->next))
if (s->cleanup)
{
s->cleanup (s, this);
s->cleanup = NULL;
}
}
/* Destroy all storage associated with select stuff. */
inline void
select_stuff::destroy ()
{
select_record *s;
select_record *snext = start.next;
select_printf ("deleting select records");
while ((s = snext))
{
snext = s->next;
delete s;
}
start.next = NULL;
}
select_stuff::~select_stuff ()
{
cleanup ();
destroy ();
}
/* Add a record to the select chain */
bool
select_stuff::test_and_set (int i, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds)
{
if (!UNIX_FD_ISSET (i, readfds) && !UNIX_FD_ISSET (i, writefds)
&& ! UNIX_FD_ISSET (i, exceptfds))
return true;
select_record *s = new select_record;
if (!s)
return false;
s->next = start.next;
start.next = s;
if (UNIX_FD_ISSET (i, readfds) && !cygheap->fdtab.select_read (i, this))
goto err;
if (UNIX_FD_ISSET (i, writefds) && !cygheap->fdtab.select_write (i, this))
goto err;
if (UNIX_FD_ISSET (i, exceptfds) && !cygheap->fdtab.select_except (i, this))
goto err; /* error */
if (s->read_ready || s->write_ready || s->except_ready)
always_ready = true;
if (s->windows_handle)
windows_used = true;
return true;
err:
start.next = s->next;
delete s;
return false;
}
/* The heart of select. Waits for an fd to do something interesting. */
select_stuff::wait_states
select_stuff::wait (fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
DWORD ms)
{
HANDLE w4[MAXIMUM_WAIT_OBJECTS];
select_record *s = &start;
DWORD m = 0;
set_signal_arrived here (w4[m++]);
if ((w4[m] = pthread::get_cancel_event ()) != NULL)
m++;
DWORD startfds = m;
/* Loop through the select chain, starting up anything appropriate and
counting the number of active fds. */
while ((s = s->next))
{
if (m >= MAXIMUM_WAIT_OBJECTS)
{
set_sig_errno (EINVAL);
return select_error;
}
if (!s->startup (s, this))
{
s->set_select_errno ();
return select_error;
}
if (s->h != NULL)
{
for (DWORD i = startfds; i < m; i++)
if (w4[i] == s->h)
goto next_while;
w4[m++] = s->h;
}
next_while:;
}
debug_printf ("m %d, ms %u", m, ms);
DWORD wait_ret;
if (!windows_used)
wait_ret = WaitForMultipleObjects (m, w4, FALSE, ms);
else
/* Using MWMO_INPUTAVAILABLE is the officially supported solution for
the problem that the call to PeekMessage disarms the queue state
so that a subsequent MWFMO hangs, even if there are still messages
in the queue. */
wait_ret = MsgWaitForMultipleObjectsEx (m, w4, ms,
QS_ALLINPUT | QS_ALLPOSTMESSAGE,
MWMO_INPUTAVAILABLE);
select_printf ("wait_ret %d. verifying", wait_ret);
wait_states res;
switch (wait_ret)
{
case WAIT_OBJECT_0:
select_printf ("signal received");
/* Need to get rid of everything when a signal occurs since we can't
be assured that a signal handler won't jump out of select entirely. */
cleanup ();
destroy ();
if (_my_tls.call_signal_handler ())
res = select_loop;
else
{
set_sig_errno (EINTR);
res = select_signalled; /* Cause loop exit in cygwin_select */
}
break;
case WAIT_FAILED:
system_printf ("WaitForMultipleObjects failed");
s = &start;
s->set_select_errno ();
res = select_error;
break;
case WAIT_TIMEOUT:
select_printf ("timed out");
res = select_set_zero;
break;
case WAIT_OBJECT_0 + 1:
if (startfds > 1)
{
cleanup ();
destroy ();
pthread::static_cancel_self ();
/*NOTREACHED*/
}
/* Fall through. This wasn't a cancel event. It was just a normal object
to wait for. */
default:
s = &start;
bool gotone = false;
/* Some types of objects (e.g., consoles) wake up on "inappropriate" events
like mouse movements. The verify function will detect these situations.
If it returns false, then this wakeup was a false alarm and we should go
back to waiting. */
while ((s = s->next))
if (s->saw_error ())
{
set_errno (s->saw_error ());
res = select_error; /* Somebody detected an error */
goto out;
}
else if ((((wait_ret >= m && s->windows_handle) || s->h == w4[wait_ret]))
&& s->verify (s, readfds, writefds, exceptfds))
gotone = true;
if (!gotone)
res = select_loop;
else
res = select_ok;
select_printf ("gotone %d", gotone);
break;
}
out:
select_printf ("returning %d", res);
return res;
}
static int
set_bits (select_record *me, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds)
{
int ready = 0;
fhandler_socket *sock;
select_printf ("me %p, testing fd %d (%s)", me, me->fd, me->fh->get_name ());
if (me->read_selected && me->read_ready)
{
UNIX_FD_SET (me->fd, readfds);
ready++;
}
if (me->write_selected && me->write_ready)
{
UNIX_FD_SET (me->fd, writefds);
if (me->except_on_write && (sock = me->fh->is_socket ()))
{
/* Special AF_LOCAL handling. */
if (!me->read_ready && sock->connect_state () == connect_pending
&& sock->af_local_connect ())
{
if (me->read_selected)
UNIX_FD_SET (me->fd, readfds);
sock->connect_state (connect_failed);
}
else
sock->connect_state (connected);
}
ready++;
}
if (me->except_selected && me->except_ready)
{
UNIX_FD_SET (me->fd, exceptfds);
ready++;
}
select_printf ("ready %d", ready);
return ready;
}
/* Poll every fd in the select chain. Set appropriate fd in mask. */
int
select_stuff::poll (fd_set *readfds, fd_set *writefds, fd_set *exceptfds)
{
int n = 0;
select_record *s = &start;
while ((s = s->next))
n += (!s->peek || s->peek (s, true)) ?
set_bits (s, readfds, writefds, exceptfds) : 0;
return n;
}
static int
verify_true (select_record *, fd_set *, fd_set *, fd_set *)
{
return 1;
}
static int
verify_ok (select_record *me, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds)
{
return set_bits (me, readfds, writefds, exceptfds);
}
static int
no_startup (select_record *, select_stuff *)
{
return 1;
}
static int
no_verify (select_record *, fd_set *, fd_set *, fd_set *)
{
return 0;
}
static int
pipe_data_available (int fd, fhandler_base *fh, HANDLE h, bool writing)
{
IO_STATUS_BLOCK iosb = {0};
FILE_PIPE_LOCAL_INFORMATION fpli = {0};
bool res;
if (fh->has_ongoing_io ())
res = false;
else if (NtQueryInformationFile (h, &iosb, &fpli, sizeof (fpli),
FilePipeLocalInformation))
{
/* If NtQueryInformationFile fails, optimistically assume the
pipe is writable. This could happen if we somehow
inherit a pipe that doesn't permit FILE_READ_ATTRIBUTES
access on the write end. */
select_printf ("fd %d, %s, NtQueryInformationFile failed",
fd, fh->get_name ());
res = writing ? true : -1;
}
else if (!writing)
{
paranoid_printf ("fd %d, %s, read avail %u", fd, fh->get_name (),
fpli.ReadDataAvailable);
res = !!fpli.ReadDataAvailable;
}
else if ((res = (fpli.WriteQuotaAvailable = (fpli.OutboundQuota -
fpli.ReadDataAvailable))))
/* If there is anything available in the pipe buffer then signal
that. This means that a pipe could still block since you could
be trying to write more to the pipe than is available in the
buffer but that is the hazard of select(). */
paranoid_printf ("fd %d, %s, write: size %lu, avail %lu", fd,
fh->get_name (), fpli.OutboundQuota,
fpli.WriteQuotaAvailable);
else if ((res = (fpli.OutboundQuota < PIPE_BUF &&
fpli.WriteQuotaAvailable == fpli.OutboundQuota)))
/* If we somehow inherit a tiny pipe (size < PIPE_BUF), then consider
the pipe writable only if it is completely empty, to minimize the
probability that a subsequent write will block. */
select_printf ("fd, %s, write tiny pipe: size %lu, avail %lu",
fd, fh->get_name (), fpli.OutboundQuota,
fpli.WriteQuotaAvailable);
return res ?: -!!(fpli.NamedPipeState & FILE_PIPE_CLOSING_STATE);
}
static int
peek_pipe (select_record *s, bool from_select)
{
HANDLE h;
set_handle_or_return_if_not_open (h, s);
int gotone = 0;
fhandler_base *fh = (fhandler_base *) s->fh;
DWORD dev = fh->get_device ();
if (s->read_selected && dev != FH_PIPEW)
{
if (s->read_ready)
{
select_printf ("%s, already ready for read", fh->get_name ());
gotone = 1;
goto out;
}
switch (fh->get_major ())
{
case DEV_PTYM_MAJOR:
{
fhandler_pty_master *fhm = (fhandler_pty_master *) fh;
fhm->flush_to_slave ();
if (fhm->need_nl)
{
gotone = s->read_ready = true;
goto out;
}
}
break;
default:
if (fh->get_readahead_valid ())
{
select_printf ("readahead");
gotone = s->read_ready = true;
goto out;
}
}
if (fh->bg_check (SIGTTIN) <= bg_eof)
{
gotone = s->read_ready = true;
goto out;
}
int n = pipe_data_available (s->fd, fh, h, false);
if (n < 0)
{
select_printf ("read: %s, n %d", fh->get_name (), n);
if (s->except_selected)
gotone += s->except_ready = true;
if (s->read_selected)
gotone += s->read_ready = true;
}
else if (n > 0)
{
select_printf ("read: %s, ready for read: avail %d", fh->get_name (), n);
gotone += s->read_ready = true;
}
if (!gotone && s->fh->hit_eof ())
{
select_printf ("read: %s, saw EOF", fh->get_name ());
if (s->except_selected)
gotone += s->except_ready = true;
if (s->read_selected)
gotone += s->read_ready = true;
}
}
out:
if (s->write_selected && dev != FH_PIPER)
{
gotone += s->write_ready = pipe_data_available (s->fd, fh, h, true);
select_printf ("write: %s, gotone %d", fh->get_name (), gotone);
}
return gotone;
}
static int start_thread_pipe (select_record *me, select_stuff *stuff);
static DWORD WINAPI
thread_pipe (void *arg)
{
select_pipe_info *pi = (select_pipe_info *) arg;
DWORD sleep_time = 0;
bool looping = true;
while (looping)
{
for (select_record *s = pi->start; (s = s->next); )
if (s->startup == start_thread_pipe)
{
if (peek_pipe (s, true))
looping = false;
if (pi->stop_thread)
{
select_printf ("stopping");
looping = false;
break;
}
}
if (!looping)
break;
Sleep (sleep_time >> 3);
if (sleep_time < 80)
++sleep_time;
if (pi->stop_thread)
break;
}
return 0;
}
static int
start_thread_pipe (select_record *me, select_stuff *stuff)
{
select_pipe_info *pi = stuff->device_specific_pipe;
if (pi->start)
me->h = *((select_pipe_info *) stuff->device_specific_pipe)->thread;
else
{
pi->start = &stuff->start;
pi->stop_thread = false;
pi->thread = new cygthread (thread_pipe, pi, "pipesel");
me->h = *pi->thread;
if (!me->h)
return 0;
}
return 1;
}
static void
pipe_cleanup (select_record *, select_stuff *stuff)
{
select_pipe_info *pi = (select_pipe_info *) stuff->device_specific_pipe;
if (!pi)
return;
if (pi->thread)
{
pi->stop_thread = true;
pi->thread->detach ();
}
delete pi;
stuff->device_specific_pipe = NULL;
}
select_record *
fhandler_pipe::select_read (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->read_selected = true;
s->read_ready = false;
return s;
}
select_record *
fhandler_pipe::select_write (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->write_selected = true;
s->write_ready = false;
return s;
}
select_record *
fhandler_pipe::select_except (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->except_selected = true;
s->except_ready = false;
return s;
}
select_record *
fhandler_fifo::select_read (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->read_selected = true;
s->read_ready = false;
return s;
}
select_record *
fhandler_fifo::select_write (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->write_selected = true;
s->write_ready = false;
return s;
}
select_record *
fhandler_fifo::select_except (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->except_selected = true;
s->except_ready = false;
return s;
}
static int
peek_console (select_record *me, bool)
{
extern const char * get_nonascii_key (INPUT_RECORD& input_rec, char *);
fhandler_console *fh = (fhandler_console *) me->fh;
if (!me->read_selected)
return me->write_ready;
if (fh->get_readahead_valid ())
{
select_printf ("readahead");
return me->read_ready = true;
}
if (me->read_ready)
{
select_printf ("already ready");
return 1;
}
INPUT_RECORD irec;
DWORD events_read;
HANDLE h;
char tmpbuf[17];
set_handle_or_return_if_not_open (h, me);
for (;;)
if (fh->bg_check (SIGTTIN) <= bg_eof)
return me->read_ready = true;
else if (!PeekConsoleInput (h, &irec, 1, &events_read) || !events_read)
break;
else
{
fh->send_winch_maybe ();
if (irec.EventType == KEY_EVENT)
{
if (irec.Event.KeyEvent.bKeyDown
&& (irec.Event.KeyEvent.uChar.AsciiChar
|| get_nonascii_key (irec, tmpbuf)))
return me->read_ready = true;
}
else
{
if (irec.EventType == MOUSE_EVENT
&& fh->mouse_aware (irec.Event.MouseEvent))
return me->read_ready = true;
if (irec.EventType == FOCUS_EVENT && fh->focus_aware ())
return me->read_ready = true;
}
/* Read and discard the event */
ReadConsoleInput (h, &irec, 1, &events_read);
}
return me->write_ready;
}
static int
verify_console (select_record *me, fd_set *rfds, fd_set *wfds,
fd_set *efds)
{
return peek_console (me, true);
}
select_record *
fhandler_console::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_console;
set_cursor_maybe ();
}
s->peek = peek_console;
s->h = get_handle ();
s->read_selected = true;
s->read_ready = false;
return s;
}
select_record *
fhandler_console::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = no_verify;
set_cursor_maybe ();
}
s->peek = peek_console;
s->write_selected = true;
s->write_ready = true;
return s;
}
select_record *
fhandler_console::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = no_verify;
set_cursor_maybe ();
}
s->peek = peek_console;
s->except_selected = true;
s->except_ready = false;
return s;
}
select_record *
fhandler_pty_common::select_read (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->read_selected = true;
s->read_ready = false;
return s;
}
select_record *
fhandler_pty_common::select_write (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->write_selected = true;
s->write_ready = false;
return s;
}
select_record *
fhandler_pty_common::select_except (select_stuff *ss)
{
if (!ss->device_specific_pipe
&& (ss->device_specific_pipe = new select_pipe_info) == NULL)
return NULL;
select_record *s = ss->start.next;
s->startup = start_thread_pipe;
s->peek = peek_pipe;
s->verify = verify_ok;
s->cleanup = pipe_cleanup;
s->except_selected = true;
s->except_ready = false;
return s;
}
static int
verify_tty_slave (select_record *me, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds)
{
if (IsEventSignalled (me->h))
me->read_ready = true;
return set_bits (me, readfds, writefds, exceptfds);
}
select_record *
fhandler_pty_slave::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
s->h = input_available_event;
s->startup = no_startup;
s->peek = peek_pipe;
s->verify = verify_tty_slave;
s->read_selected = true;
s->read_ready = false;
s->cleanup = NULL;
return s;
}
select_record *
fhandler_dev_null::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = no_verify;
}
s->h = get_handle ();
s->read_selected = true;
s->read_ready = true;
return s;
}
select_record *
fhandler_dev_null::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = no_verify;
}
s->h = get_handle ();
s->write_selected = true;
s->write_ready = true;
return s;
}
select_record *
fhandler_dev_null::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = no_verify;
}
s->h = get_handle ();
s->except_selected = true;
s->except_ready = false;
return s;
}
static int start_thread_serial (select_record *me, select_stuff *stuff);
static int
peek_serial (select_record *s, bool)
{
COMSTAT st;
fhandler_serial *fh = (fhandler_serial *) s->fh;
if (fh->get_readahead_valid () || fh->overlapped_armed < 0)
return s->read_ready = true;
select_printf ("fh->overlapped_armed %d", fh->overlapped_armed);
HANDLE h;
set_handle_or_return_if_not_open (h, s);
int ready = 0;
if ((s->read_selected && s->read_ready) || (s->write_selected && s->write_ready))
{
select_printf ("already ready");
ready = 1;
goto out;
}
/* This is apparently necessary for the com0com driver.
See: http://cygwin.com/ml/cygwin/2009-01/msg00667.html */
SetCommMask (h, 0);
SetCommMask (h, EV_RXCHAR);
if (!fh->overlapped_armed)
{
COMSTAT st;
ResetEvent (fh->io_status.hEvent);
if (!ClearCommError (h, &fh->ev, &st))
{
debug_printf ("ClearCommError");
goto err;
}
else if (st.cbInQue)
return s->read_ready = true;
else if (WaitCommEvent (h, &fh->ev, &fh->io_status))
return s->read_ready = true;
else if (GetLastError () == ERROR_IO_PENDING)
fh->overlapped_armed = 1;
else
{
debug_printf ("WaitCommEvent");
goto err;
}
}
switch (WaitForSingleObject (fh->io_status.hEvent, 10L))
{
case WAIT_OBJECT_0:
if (!ClearCommError (h, &fh->ev, &st))
{
debug_printf ("ClearCommError");
goto err;
}
else if (!st.cbInQue)
Sleep (10L);
else
{
return s->read_ready = true;
select_printf ("got something");
}
break;
case WAIT_TIMEOUT:
break;
default:
debug_printf ("WaitForMultipleObjects");
goto err;
}
out:
return ready;
err:
if (GetLastError () == ERROR_OPERATION_ABORTED)
{
select_printf ("operation aborted");
return ready;
}
s->set_select_errno ();
select_printf ("error %E");
return -1;
}
static DWORD WINAPI
thread_serial (void *arg)
{
select_serial_info *si = (select_serial_info *) arg;
bool looping = true;
while (looping)
for (select_record *s = si->start; (s = s->next); )
if (s->startup != start_thread_serial)
continue;
else
{
if (peek_serial (s, true))
looping = false;
if (si->stop_thread)
{
select_printf ("stopping");
looping = false;
break;
}
}
select_printf ("exiting");
return 0;
}
static int
start_thread_serial (select_record *me, select_stuff *stuff)
{
if (stuff->device_specific_serial)
me->h = *((select_serial_info *) stuff->device_specific_serial)->thread;
else
{
select_serial_info *si = new select_serial_info;
si->start = &stuff->start;
si->stop_thread = false;
si->thread = new cygthread (thread_serial, si, "sersel");
me->h = *si->thread;
stuff->device_specific_serial = si;
}
return 1;
}
static void
serial_cleanup (select_record *, select_stuff *stuff)
{
select_serial_info *si = (select_serial_info *) stuff->device_specific_serial;
if (!si)
return;
if (si->thread)
{
si->stop_thread = true;
si->thread->detach ();
}
delete si;
stuff->device_specific_serial = NULL;
}
select_record *
fhandler_serial::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = start_thread_serial;
s->verify = verify_ok;
s->cleanup = serial_cleanup;
}
s->peek = peek_serial;
s->read_selected = true;
s->read_ready = false;
return s;
}
select_record *
fhandler_serial::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->peek = peek_serial;
s->h = get_handle ();
s->write_selected = true;
s->write_ready = true;
return s;
}
select_record *
fhandler_serial::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->h = NULL;
s->peek = peek_serial;
s->except_selected = false; // Can't do this
s->except_ready = false;
return s;
}
select_record *
fhandler_base::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->h = get_handle ();
s->read_selected = true;
s->read_ready = true;
return s;
}
select_record *
fhandler_base::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->h = get_handle ();
s->write_selected = true;
s->write_ready = true;
return s;
}
select_record *
fhandler_base::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->h = NULL;
s->except_selected = true;
s->except_ready = false;
return s;
}
static int
peek_socket (select_record *me, bool)
{
fhandler_socket *fh = (fhandler_socket *) me->fh;
long events;
/* Don't play with the settings again, unless having taken a deep look into
Richard W. Stevens Network Programming book. Thank you. */
long evt_mask = (me->read_selected ? (FD_READ | FD_ACCEPT | FD_CLOSE) : 0)
| (me->write_selected ? (FD_WRITE | FD_CONNECT | FD_CLOSE) : 0)
| (me->except_selected ? FD_OOB : 0);
int ret = fh->evaluate_events (evt_mask, events, false);
if (me->read_selected)
me->read_ready |= ret || !!(events & (FD_READ | FD_ACCEPT | FD_CLOSE));
if (me->write_selected)
me->write_ready |= ret || !!(events & (FD_WRITE | FD_CONNECT | FD_CLOSE));
if (me->except_selected)
me->except_ready |= !!(events & FD_OOB);
select_printf ("read_ready: %d, write_ready: %d, except_ready: %d",
me->read_ready, me->write_ready, me->except_ready);
return me->read_ready || me->write_ready || me->except_ready;
}
static int start_thread_socket (select_record *, select_stuff *);
static DWORD WINAPI
thread_socket (void *arg)
{
select_socket_info *si = (select_socket_info *) arg;
DWORD timeout = (si->num_w4 <= MAXIMUM_WAIT_OBJECTS)
? INFINITE
: (64 / (roundup2 (si->num_w4, MAXIMUM_WAIT_OBJECTS)
/ MAXIMUM_WAIT_OBJECTS));
bool event = false;
select_printf ("stuff_start %p, timeout %u", si->start, timeout);
while (!event)
{
for (select_record *s = si->start; (s = s->next); )
if (s->startup == start_thread_socket)
if (peek_socket (s, false))
event = true;
if (!event)
for (int i = 0; i < si->num_w4; i += MAXIMUM_WAIT_OBJECTS)
switch (WaitForMultipleObjects (MIN (si->num_w4 - i,
MAXIMUM_WAIT_OBJECTS),
si->w4 + i, FALSE, timeout))
{
case WAIT_FAILED:
goto out;
case WAIT_TIMEOUT:
continue;
case WAIT_OBJECT_0:
if (!i) /* Socket event set. */
goto out;
/*FALLTHRU*/
default:
break;
}
}
out:
select_printf ("leaving thread_socket");
return 0;
}
static inline bool init_tls_select_info () __attribute__ ((always_inline));
static inline bool
init_tls_select_info ()
{
if (!_my_tls.locals.select.sockevt)
{
_my_tls.locals.select.sockevt = CreateEvent (&sec_none_nih, TRUE, FALSE,
NULL);
if (!_my_tls.locals.select.sockevt)
return false;
}
if (!_my_tls.locals.select.ser_num)
{
_my_tls.locals.select.ser_num
= (LONG *) malloc (MAXIMUM_WAIT_OBJECTS * sizeof (LONG));
if (!_my_tls.locals.select.ser_num)
return false;
_my_tls.locals.select.w4
= (HANDLE *) malloc (MAXIMUM_WAIT_OBJECTS * sizeof (HANDLE));
if (!_my_tls.locals.select.w4)
{
free (_my_tls.locals.select.ser_num);
_my_tls.locals.select.ser_num = NULL;
return false;
}
_my_tls.locals.select.max_w4 = MAXIMUM_WAIT_OBJECTS;
}
return true;
}
static int
start_thread_socket (select_record *me, select_stuff *stuff)
{
select_socket_info *si;
if ((si = (select_socket_info *) stuff->device_specific_socket))
{
me->h = *si->thread;
return 1;
}
si = new select_socket_info;
if (!init_tls_select_info ())
return 0;
si->ser_num = _my_tls.locals.select.ser_num;
si->w4 = _my_tls.locals.select.w4;
si->w4[0] = _my_tls.locals.select.sockevt;
si->num_w4 = 1;
select_record *s = &stuff->start;
while ((s = s->next))
if (s->startup == start_thread_socket)
{
/* No event/socket should show up multiple times. Every socket
is uniquely identified by its serial number in the global
wsock_events record. */
const LONG ser_num = ((fhandler_socket *) s->fh)->serial_number ();
for (int i = 1; i < si->num_w4; ++i)
if (si->ser_num[i] == ser_num)
goto continue_outer_loop;
if (si->num_w4 >= _my_tls.locals.select.max_w4)
{
LONG *nser = (LONG *) realloc (si->ser_num,
(_my_tls.locals.select.max_w4
+ MAXIMUM_WAIT_OBJECTS)
* sizeof (LONG));
if (!nser)
return 0;
_my_tls.locals.select.ser_num = si->ser_num = nser;
HANDLE *nw4 = (HANDLE *) realloc (si->w4,
(_my_tls.locals.select.max_w4
+ MAXIMUM_WAIT_OBJECTS)
* sizeof (HANDLE));
if (!nw4)
return 0;
_my_tls.locals.select.w4 = si->w4 = nw4;
_my_tls.locals.select.max_w4 += MAXIMUM_WAIT_OBJECTS;
}
si->ser_num[si->num_w4] = ser_num;
si->w4[si->num_w4++] = ((fhandler_socket *) s->fh)->wsock_event ();
continue_outer_loop:
;
}
stuff->device_specific_socket = si;
si->start = &stuff->start;
select_printf ("stuff_start %p", &stuff->start);
si->thread = new cygthread (thread_socket, si, "socksel");
me->h = *si->thread;
return 1;
}
void
socket_cleanup (select_record *, select_stuff *stuff)
{
select_socket_info *si = (select_socket_info *) stuff->device_specific_socket;
select_printf ("si %p si->thread %p", si, si ? si->thread : NULL);
if (!si)
return;
if (si->thread)
{
SetEvent (si->w4[0]);
/* Wait for thread to go away */
si->thread->detach ();
ResetEvent (si->w4[0]);
}
delete si;
stuff->device_specific_socket = NULL;
select_printf ("returning");
}
select_record *
fhandler_socket::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = start_thread_socket;
s->verify = verify_true;
s->cleanup = socket_cleanup;
}
s->peek = peek_socket;
s->read_ready = saw_shutdown_read ();
s->read_selected = true;
return s;
}
select_record *
fhandler_socket::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = start_thread_socket;
s->verify = verify_true;
s->cleanup = socket_cleanup;
}
s->peek = peek_socket;
s->write_ready = saw_shutdown_write () || connect_state () == unconnected;
s->write_selected = true;
if (connect_state () != unconnected)
{
s->except_ready = saw_shutdown_write () || saw_shutdown_read ();
s->except_on_write = true;
}
return s;
}
select_record *
fhandler_socket::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = start_thread_socket;
s->verify = verify_true;
s->cleanup = socket_cleanup;
}
s->peek = peek_socket;
/* FIXME: Is this right? Should these be used as criteria for except? */
s->except_ready = saw_shutdown_write () || saw_shutdown_read ();
s->except_selected = true;
return s;
}
static int
peek_windows (select_record *me, bool)
{
MSG m;
HANDLE h;
set_handle_or_return_if_not_open (h, me);
if (me->read_selected && me->read_ready)
return 1;
if (PeekMessageW (&m, (HWND) h, 0, 0, PM_NOREMOVE))
{
me->read_ready = true;
select_printf ("window %d(%p) ready", me->fd, h);
return 1;
}
select_printf ("window %d(%p) not ready", me->fd, h);
return me->write_ready;
}
static int
verify_windows (select_record *me, fd_set *rfds, fd_set *wfds,
fd_set *efds)
{
return peek_windows (me, true);
}
select_record *
fhandler_windows::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
}
s->verify = verify_windows;
s->peek = peek_windows;
s->read_selected = true;
s->read_ready = false;
s->h = get_handle ();
s->windows_handle = true;
return s;
}
select_record *
fhandler_windows::select_write (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->peek = peek_windows;
s->h = get_handle ();
s->write_selected = true;
s->write_ready = true;
s->windows_handle = true;
return s;
}
select_record *
fhandler_windows::select_except (select_stuff *ss)
{
select_record *s = ss->start.next;
if (!s->startup)
{
s->startup = no_startup;
s->verify = verify_ok;
}
s->peek = peek_windows;
s->h = get_handle ();
s->except_selected = true;
s->except_ready = false;
s->windows_handle = true;
return s;
}
static int
peek_mailslot (select_record *me, bool)
{
HANDLE h;
set_handle_or_return_if_not_open (h, me);
if (me->read_selected && me->read_ready)
return 1;
DWORD msgcnt = 0;
if (!GetMailslotInfo (h, NULL, NULL, &msgcnt, NULL))
{
select_printf ("mailslot %d(%p) error %E", me->fd, h);
return 1;
}
if (msgcnt > 0)
{
me->read_ready = true;
select_printf ("mailslot %d(%p) ready", me->fd, h);
return 1;
}
select_printf ("mailslot %d(%p) not ready", me->fd, h);
return 0;
}
static int
verify_mailslot (select_record *me, fd_set *rfds, fd_set *wfds,
fd_set *efds)
{
return peek_mailslot (me, true);
}
static int start_thread_mailslot (select_record *me, select_stuff *stuff);
static DWORD WINAPI
thread_mailslot (void *arg)
{
select_mailslot_info *mi = (select_mailslot_info *) arg;
bool gotone = false;
DWORD sleep_time = 0;
for (;;)
{
select_record *s = mi->start;
while ((s = s->next))
if (s->startup == start_thread_mailslot)
{
if (peek_mailslot (s, true))
gotone = true;
if (mi->stop_thread)
{
select_printf ("stopping");
goto out;
}
}
/* Paranoid check */
if (mi->stop_thread)
{
select_printf ("stopping from outer loop");
break;
}
if (gotone)
break;
Sleep (sleep_time >> 3);
if (sleep_time < 80)
++sleep_time;
}
out:
return 0;
}
static int
start_thread_mailslot (select_record *me, select_stuff *stuff)
{
if (stuff->device_specific_mailslot)
{
me->h = *((select_mailslot_info *) stuff->device_specific_mailslot)->thread;
return 1;
}
select_mailslot_info *mi = new select_mailslot_info;
mi->start = &stuff->start;
mi->stop_thread = false;
mi->thread = new cygthread (thread_mailslot, mi, "mailsel");
me->h = *mi->thread;
if (!me->h)
return 0;
stuff->device_specific_mailslot = mi;
return 1;
}
static void
mailslot_cleanup (select_record *, select_stuff *stuff)
{
select_mailslot_info *mi = (select_mailslot_info *) stuff->device_specific_mailslot;
if (!mi)
return;
if (mi->thread)
{
mi->stop_thread = true;
mi->thread->detach ();
}
delete mi;
stuff->device_specific_mailslot = NULL;
}
select_record *
fhandler_mailslot::select_read (select_stuff *ss)
{
select_record *s = ss->start.next;
s->startup = start_thread_mailslot;
s->peek = peek_mailslot;
s->verify = verify_mailslot;
s->cleanup = mailslot_cleanup;
s->read_selected = true;
s->read_ready = false;
return s;
}
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