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1998-12-05 Roland McGrath <roland@baalperazim.frob.com>

Browse Source 
* sysdeps/mach/hurd/pselect.c: New file.

	* sysdeps/mach/hurd/poll.c: New file.

	* hurd/Makefile (routines): Add hurdselect.
	* hurd/hurdselect.c: New file.
	(_hurd_select): New function, guts taken from ...
	* sysdeps/mach/hurd/select.c (__select): ... here.
	Now work by just calling _hurd_select.
	* hurd/hurd/fd.h: Declare _hurd_select.

1998-12-05  Roland McGrath  <roland@baalperazim.frob.com>

	* time/strptime.c: Fix unterminated comment in last change.

	* argp/argp.h: Add __restrict.
This commit is contained in:
Roland McGrath
1998-12-06 00:44:12 +00:00
parent 7885870df3
commit 0d3eb016d6
6 changed files with 532 additions and 303 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
ChangeLog
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@ -1,3 +1,20 @@
1998-12-05 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/mach/hurd/pselect.c: New file.
* sysdeps/mach/hurd/poll.c: New file.
* hurd/Makefile (routines): Add hurdselect.
* hurd/hurdselect.c: New file.
(_hurd_select): New function, guts taken from ...
* sysdeps/mach/hurd/select.c (__select): ... here.
Now work by just calling _hurd_select.
* hurd/hurd/fd.h: Declare _hurd_select.
1998-12-05 Roland McGrath <roland@baalperazim.frob.com>
* time/strptime.c: Fix unterminated comment in last change.
1998-12-05 Ulrich Drepper <drepper@cygnus.com> 1998-12-05 Ulrich Drepper <drepper@cygnus.com>
* ctype/ctype.h (_ISbit): Protect use of parameter with * ctype/ctype.h (_ISbit): Protect use of parameter with
@ -13,7 +30,7 @@
1998-12-04 Ulrich Drepper <drepper@cygnus.com> 1998-12-04 Ulrich Drepper <drepper@cygnus.com>
* argp/argp.h: Add __retrict. * argp/argp.h: Add __restrict.
* dirent/dirent.h: Likewise. * dirent/dirent.h: Likewise.
* elf/dlfcn.h: Likewise. * elf/dlfcn.h: Likewise.
* grp/grp.h: Likewise. * grp/grp.h: Likewise.

2
hurd/Makefile
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@ -41,7 +41,7 @@ user-interfaces := $(addprefix hurd/,\
server-interfaces := hurd/msg faultexc server-interfaces := hurd/msg faultexc
routines = hurdstartup hurdinit \ routines = hurdstartup hurdinit \
hurdid hurdlookup hurdpid hurdrlimit hurdprio hurdexec \ hurdid hurdlookup hurdpid hurdrlimit hurdprio hurdexec hurdselect \
get-host set-host \ get-host set-host \
path-lookup \ path-lookup \
setauth \ setauth \

16
hurd/hurd/fd.h
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@ -1,5 +1,5 @@
/* File descriptors. /* File descriptors.
Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. Copyright (C) 1993,94,95,96,97,98 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -223,4 +223,18 @@ extern error_t _hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t));
extern error_t _hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t)); extern error_t _hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t));
/* The guts of `select' and `poll'. Check the first NFDS descriptors
either in POLLFDS (if nonnull) or in each of READFDS, WRITEFDS,
EXCEPTFDS that is nonnull. If TIMEOUT is not NULL, time out after
waiting the interval specified therein. If SIGMASK is nonnull,
the set of blocked signals is temporarily set to that during this call.
Returns the number of ready descriptors, or -1 for errors. */
struct pollfd;
struct timespec;
extern int _hurd_select (int nfds, struct pollfd *pollfds,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
const struct timespec *timeout,
const sigset_t *sigmask);
#endif /* hurd/fd.h */ #endif /* hurd/fd.h */

444
hurd/hurdselect.c Normal file
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@ -0,0 +1,444 @@
/* Guts of both `select' and `poll' for Hurd.
Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sys/types.h>
#include <sys/poll.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdint.h>
/* All user select types. */
#define SELECT_ALL (SELECT_READ | SELECT_WRITE | SELECT_URG)
/* Used to record that a particular select rpc returned. Must be distinct
from SELECT_ALL (which better not have the high bit set). */
#define SELECT_RETURNED ((SELECT_ALL << 1) & ~SELECT_ALL)
/* Check the first NFDS descriptors either in POLLFDS (if nonnnull) or in
each of READFDS, WRITEFDS, EXCEPTFDS that is nonnull. If TIMEOUT is not
NULL, time out after waiting the interval specified therein. Returns
the number of ready descriptors, or -1 for errors. */
int
_hurd_select (int nfds,
struct pollfd *pollfds,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
const struct timespec *timeout, const sigset_t *sigmask)
{
int i;
mach_port_t portset;
int got;
error_t err;
fd_set rfds, wfds, xfds;
int firstfd, lastfd;
mach_msg_timeout_t to = (timeout != NULL ?
(timeout->tv_sec * 1000 +
timeout->tv_nsec / 1000000) :
0);
struct
{
struct hurd_userlink ulink;
struct hurd_fd *cell;
mach_port_t io_port;
int type;
mach_port_t reply_port;
} d[nfds];
sigset_t oset;
if (sigmask && __sigprocmask (SIG_SETMASK, sigmask, &oset))
return -1;
if (pollfds)
{
/* Collect interesting descriptors from the user's `pollfd' array.
We do a first pass that reads the user's array before taking
any locks. The second pass then only touches our own stack,
and gets the port references. */
for (i = 0; i < nfds; ++i)
if (pollfds[i].fd >= 0)
{
int type = 0;
if (pollfds[i].events & POLLIN)
type |= SELECT_READ;
if (pollfds[i].events & POLLOUT)
type |= SELECT_WRITE;
if (pollfds[i].events & POLLPRI)
type |= SELECT_URG;
d[i].io_port = pollfds[i].fd;
d[i].type = type;
}
else
d[i].type = 0;
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_dtable_lock);
for (i = 0; i < nfds; ++i)
if (d[i].type != 0)
{
const int fd = (int) d[i].io_port;
if (fd < _hurd_dtablesize)
{
d[i].cell = _hurd_dtable[fd];
d[i].io_port = _hurd_port_get (&d[i].cell->port, &d[i].ulink);
if (d[i].io_port != MACH_PORT_NULL)
continue;
}
/* If one descriptor is bogus, we fail completely. */
while (i-- > 0)
if (d[i].type != 0)
_hurd_port_free (&d[i].cell->port,
&d[i].ulink, d[i].io_port);
break;
}
__mutex_unlock (&_hurd_dtable_lock);
HURD_CRITICAL_END;
if (i < nfds)
{
if (sigmask)
__sigprocmask (SIG_SETMASK, &oset, NULL);
errno = EBADF;
return -1;
}
lastfd = i - 1;
firstfd = i == 0 ? lastfd : 0;
}
else
{
/* Collect interested descriptors from the user's fd_set arguments.
Use local copies so we can't crash from user bogosity. */
if (readfds == NULL)
FD_ZERO (&rfds);
else
rfds = *readfds;
if (writefds == NULL)
FD_ZERO (&wfds);
else
wfds = *writefds;
if (exceptfds == NULL)
FD_ZERO (&xfds);
else
xfds = *exceptfds;
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_dtable_lock);
if (nfds > _hurd_dtablesize)
nfds = _hurd_dtablesize;
/* Collect the ports for interesting FDs. */
firstfd = lastfd = -1;
for (i = 0; i < nfds; ++i)
{
int type = 0;
if (readfds != NULL && FD_ISSET (i, &rfds))
type |= SELECT_READ;
if (writefds != NULL && FD_ISSET (i, &wfds))
type |= SELECT_WRITE;
if (exceptfds != NULL && FD_ISSET (i, &xfds))
type |= SELECT_URG;
d[i].type = type;
if (type)
{
d[i].cell = _hurd_dtable[i];
d[i].io_port = _hurd_port_get (&d[i].cell->port, &d[i].ulink);
if (d[i].io_port == MACH_PORT_NULL)
{
/* If one descriptor is bogus, we fail completely. */
while (i-- > 0)
_hurd_port_free (&d[i].cell->port, &d[i].ulink,
d[i].io_port);
break;
}
lastfd = i;
if (firstfd == -1)
firstfd = i;
}
}
__mutex_unlock (&_hurd_dtable_lock);
HURD_CRITICAL_END;
if (i < nfds)
{
if (sigmask)
__sigprocmask (SIG_SETMASK, &oset, NULL);
errno = EBADF;
return -1;
}
}
err = 0;
got = 0;
/* Send them all io_select request messages. */
if (firstfd == -1)
/* But not if there were no ports to deal with at all.
We are just a pure timeout. */
portset = __mach_reply_port ();
else
{
portset = MACH_PORT_NULL;
for (i = firstfd; i <= lastfd; ++i)
if (d[i].type)
{
int type = d[i].type;
d[i].reply_port = __mach_reply_port ();
err = __io_select (d[i].io_port, d[i].reply_port,
/* Poll only if there's a single descriptor. */
(firstfd == lastfd) ? to : 0,
&type);
switch (err)
{
case MACH_RCV_TIMED_OUT:
/* No immediate response. This is normal. */
err = 0;
if (firstfd == lastfd)
/* When there's a single descriptor, we don't need a
portset, so just pretend we have one, but really
use the single reply port. */
portset = d[i].reply_port;
else if (got == 0)
/* We've got multiple reply ports, so we need a port set to
multiplex them. */
{
/* We will wait again for a reply later. */
if (portset == MACH_PORT_NULL)
/* Create the portset to receive all the replies on. */
err = __mach_port_allocate (__mach_task_self (),
MACH_PORT_RIGHT_PORT_SET,
&portset);
if (! err)
/* Put this reply port in the port set. */
__mach_port_move_member (__mach_task_self (),
d[i].reply_port, portset);
}
break;
default:
/* No other error should happen. Callers of select
don't expect to see errors, so we simulate
readiness of the erring object and the next call
hopefully will get the error again. */
type = SELECT_ALL;
/* FALLTHROUGH */
case 0:
/* We got an answer. */
if ((type & SELECT_ALL) == 0)
/* Bogus answer; treat like an error, as a fake positive. */
type = SELECT_ALL;
/* This port is already ready already. */
d[i].type &= type;
d[i].type |= SELECT_RETURNED;
++got;
break;
}
_hurd_port_free (&d[i].cell->port, &d[i].ulink, d[i].io_port);
}
}
/* Now wait for reply messages. */
if (!err && got == 0)
{
/* Now wait for io_select_reply messages on PORT,
timing out as appropriate. */
union
{
mach_msg_header_t head;
struct
{
mach_msg_header_t head;
mach_msg_type_t err_type;
error_t err;
} error;
struct
{
mach_msg_header_t head;
mach_msg_type_t err_type;
error_t err;
mach_msg_type_t result_type;
int result;
} success;
} msg;
mach_msg_option_t options = (timeout == NULL ? 0 : MACH_RCV_TIMEOUT);
error_t msgerr;
while ((msgerr = __mach_msg (&msg.head,
MACH_RCV_MSG | options,
0, sizeof msg, portset, to,
MACH_PORT_NULL)) == MACH_MSG_SUCCESS)
{
/* We got a message. Decode it. */
#define IO_SELECT_REPLY_MSGID (21012 + 100) /* XXX */
const mach_msg_type_t inttype =
{ MACH_MSG_TYPE_INTEGER_T, sizeof (MACH_MSG_TYPE_INTEGER_T) * 8,
1, 1, 0, 0 };
if (msg.head.msgh_id == IO_SELECT_REPLY_MSGID &&
msg.head.msgh_size >= sizeof msg.error &&
!(msg.head.msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
*(int *) &msg.error.err_type == *(int *) &inttype)
{
/* This is a properly formatted message so far.
See if it is a success or a failure. */
if (msg.error.err == EINTR &&
msg.head.msgh_size == sizeof msg.error)
{
/* EINTR response; poll for further responses
and then return quickly. */
err = EINTR;
goto poll;
}
if (msg.error.err ||
msg.head.msgh_size != sizeof msg.success ||
*(int *) &msg.success.result_type != *(int *) &inttype ||
(msg.success.result & SELECT_ALL) == 0)
{
/* Error or bogus reply. Simulate readiness. */
__mach_msg_destroy (&msg.head);
msg.success.result = SELECT_ALL;
}
/* Look up the respondent's reply port and record its
readiness. */
{
int had = got;
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
if (d[i].type
&& d[i].reply_port == msg.head.msgh_local_port)
{
d[i].type &= msg.success.result;
d[i].type |= SELECT_RETURNED;
++got;
}
assert (got > had);
}
}
if (msg.head.msgh_remote_port != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (),
msg.head.msgh_remote_port);
if (got)
poll:
{
/* Poll for another message. */
to = 0;
options |= MACH_RCV_TIMEOUT;
}
}
if (err == MACH_RCV_TIMED_OUT)
/* This is the normal value for ERR. We might have timed out and
read no messages. Otherwise, after receiving the first message,
we poll for more messages. We receive with a timeout of 0 to
effect a poll, so ERR is MACH_RCV_TIMED_OUT when the poll finds no
message waiting. */
err = 0;
if (got)
/* At least one descriptor is known to be ready now, so we will
return success. */
err = 0;
}
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
if (d[i].type)
__mach_port_destroy (__mach_task_self (), d[i].reply_port);
if (firstfd == -1 || (firstfd != lastfd && portset != MACH_PORT_NULL))
/* Destroy PORTSET, but only if it's not actually the reply port for a
single descriptor (in which case it's destroyed in the previous loop;
not doing it here is just a bit more efficient). */
__mach_port_destroy (__mach_task_self (), portset);
if (err)
{
if (sigmask)
__sigprocmask (SIG_SETMASK, &oset, NULL);
return __hurd_fail (err);
}
if (pollfds)
/* Fill in the `revents' members of the user's array. */
for (i = 0; i < nfds; ++i)
{
const int type = d[i].type;
int_fast16_t revents = 0;
if (type & SELECT_READ)
revents |= POLLIN;
if (type & SELECT_WRITE)
revents |= POLLOUT;
if (type & SELECT_URG)
revents |= POLLPRI;
pollfds[i].revents = revents;
}
else
{
/* Below we recalculate GOT to include an increment for each operation
allowed on each fd. */
got = 0;
/* Set the user bitarrays. We only ever have to clear bits, as all
desired ones are initially set. */
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
{
int type = d[i].type;
if ((type & SELECT_RETURNED) == 0)
type = 0;
if (type & SELECT_READ)
got++;
else if (readfds)
FD_CLR (i, readfds);
if (type & SELECT_WRITE)
got++;
else if (writefds)
FD_CLR (i, writefds);
if (type & SELECT_URG)
got++;
else if (exceptfds)
FD_CLR (i, exceptfds);
}
}
if (sigmask && __sigprocmask (SIG_SETMASK, &oset, NULL))
return -1;
return got;
}

45
sysdeps/mach/hurd/pselect.c Normal file
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@ -0,0 +1,45 @@
/* pselect for Hurd.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/select.h>
#include <hurd.h>
#include <hurd/fd.h>
/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
after waiting the interval specified therein. Additionally set the sigmask
SIGMASK for this call. Returns the number of ready descriptors, or -1 for
errors. */
int
__pselect (nfds, readfds, writefds, exceptfds, timeout, sigmask)
int nfds;
fd_set *readfds;
fd_set *writefds;
fd_set *exceptfds;
const struct timespec *timeout;
const sigset_t *sigmask;
{
return _hurd_select (nfds, NULL,
readfds, writefds, exceptfds, timeout, sigmask);
}
weak_alias (__pselect, pselect)

309
sysdeps/mach/hurd/select.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc. /* Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -17,18 +17,9 @@
Boston, MA 02111-1307, USA. */ Boston, MA 02111-1307, USA. */
#include <sys/types.h> #include <sys/types.h>
#include <sys/time.h>
#include <hurd.h> #include <hurd.h>
#include <hurd/fd.h> #include <hurd/fd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
/* All user select types. */
#define SELECT_ALL (SELECT_READ | SELECT_WRITE | SELECT_URG)
/* Used to record that a particular select rpc returned. Must be distinct
from SELECT_ALL (which better not have the high bit set). */
#define SELECT_RETURNED ((SELECT_ALL << 1) & ~SELECT_ALL)
/* Check the first NFDS descriptors each in READFDS (if not NULL) for read /* Check the first NFDS descriptors each in READFDS (if not NULL) for read
readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
@ -43,299 +34,17 @@ __select (nfds, readfds, writefds, exceptfds, timeout)
fd_set *exceptfds; fd_set *exceptfds;
struct timeval *timeout; struct timeval *timeout;
{ {
int i; struct timespec ts, *to;
mach_port_t portset;
int got; if (timeout)
error_t err;
fd_set rfds, wfds, xfds;
int firstfd, lastfd;
mach_msg_timeout_t to = (timeout != NULL ?
(timeout->tv_sec * 1000 +
timeout->tv_usec / 1000) :
0);
struct
{ {
struct hurd_userlink ulink; to = &ts;
struct hurd_fd *cell; TIMEVAL_TO_TIMESPEC (timeout, to);
mach_port_t io_port;
int type;
mach_port_t reply_port;
} d[nfds];
/* Use local copies so we can't crash from user bogosity. */
if (readfds == NULL)
FD_ZERO (&rfds);
else
rfds = *readfds;
if (writefds == NULL)
FD_ZERO (&wfds);
else
wfds = *writefds;
if (exceptfds == NULL)
FD_ZERO (&xfds);
else
xfds = *exceptfds;
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_dtable_lock);
if (nfds > _hurd_dtablesize)
nfds = _hurd_dtablesize;
/* Collect the ports for interesting FDs. */
firstfd = lastfd = -1;
for (i = 0; i < nfds; ++i)
{
int type = 0;
if (readfds != NULL && FD_ISSET (i, &rfds))
type |= SELECT_READ;
if (writefds != NULL && FD_ISSET (i, &wfds))
type |= SELECT_WRITE;
if (exceptfds != NULL && FD_ISSET (i, &xfds))
type |= SELECT_URG;
d[i].type = type;
if (type)
{
d[i].cell = _hurd_dtable[i];
d[i].io_port = _hurd_port_get (&d[i].cell->port, &d[i].ulink);
if (d[i].io_port == MACH_PORT_NULL)
{
/* If one descriptor is bogus, we fail completely. */
while (i-- > 0)
_hurd_port_free (&d[i].cell->port, &d[i].ulink, d[i].io_port);
errno = EBADF;
break;
}
lastfd = i;
if (firstfd == -1)
firstfd = i;
}
} }
__mutex_unlock (&_hurd_dtable_lock);
HURD_CRITICAL_END;
if (i < nfds)
return -1;
/* Send them all io_select request messages. */
if (firstfd == -1)
/* But not if there were no ports to deal with at all. */
portset = __mach_reply_port ();
else else
{ to = NULL;
err = 0;
got = 0;
portset = MACH_PORT_NULL;
for (i = firstfd; i <= lastfd; ++i) return _hurd_select (nfds, NULL, readfds, writefds, exceptfds, to, NULL);
if (d[i].type)
{
int type = d[i].type;
d[i].reply_port = __mach_reply_port ();
err = __io_select (d[i].io_port, d[i].reply_port,
/* Poll only if there's a single descriptor. */
(firstfd == lastfd) ? to : 0,
&type);
switch (err)
{
case MACH_RCV_TIMED_OUT:
/* No immediate response. This is normal. */
err = 0;
if (firstfd == lastfd)
/* When there's a single descriptor, we don't need a
portset, so just pretend we have one, but really
use the single reply port. */
portset = d[i].reply_port;
else if (got == 0)
/* We've got multiple reply ports, so we need a port set to
multiplex them. */
{
/* We will wait again for a reply later. */
if (portset == MACH_PORT_NULL)
/* Create the portset to receive all the replies on. */
err = __mach_port_allocate (__mach_task_self (),
MACH_PORT_RIGHT_PORT_SET,
&portset);
if (! err)
/* Put this reply port in the port set. */
__mach_port_move_member (__mach_task_self (),
d[i].reply_port, portset);
}
break;
default:
/* No other error should happen. Callers of select
don't expect to see errors, so we simulate
readiness of the erring object and the next call
hopefully will get the error again. */
type = SELECT_ALL;
/* FALLTHROUGH */
case 0:
/* We got an answer. */
if ((type & SELECT_ALL) == 0)
/* Bogus answer; treat like an error, as a fake positive. */
type = SELECT_ALL;
/* This port is already ready already. */
d[i].type &= type;
d[i].type |= SELECT_RETURNED;
++got;
break;
}
_hurd_port_free (&d[i].cell->port, &d[i].ulink, d[i].io_port);
}
}
/* Now wait for reply messages. */
if (!err && got == 0)
{
/* Now wait for io_select_reply messages on PORT,
timing out as appropriate. */
union
{
mach_msg_header_t head;
struct
{
mach_msg_header_t head;
mach_msg_type_t err_type;
error_t err;
} error;
struct
{
mach_msg_header_t head;
mach_msg_type_t err_type;
error_t err;
mach_msg_type_t result_type;
int result;
} success;
} msg;
mach_msg_option_t options = (timeout == NULL ? 0 : MACH_RCV_TIMEOUT);
error_t msgerr;
while ((msgerr = __mach_msg (&msg.head,
MACH_RCV_MSG | options,
0, sizeof msg, portset, to,
MACH_PORT_NULL)) == MACH_MSG_SUCCESS)
{
/* We got a message. Decode it. */
#define IO_SELECT_REPLY_MSGID (21012 + 100) /* XXX */
const mach_msg_type_t inttype =
{ MACH_MSG_TYPE_INTEGER_T, sizeof (MACH_MSG_TYPE_INTEGER_T) * 8,
1, 1, 0, 0 };
if (msg.head.msgh_id == IO_SELECT_REPLY_MSGID &&
msg.head.msgh_size >= sizeof msg.error &&
!(msg.head.msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
*(int *) &msg.error.err_type == *(int *) &inttype)
{
/* This is a properly formatted message so far.
See if it is a success or a failure. */
if (msg.error.err == EINTR &&
msg.head.msgh_size == sizeof msg.error)
{
/* EINTR response; poll for further responses
and then return quickly. */
err = EINTR;
goto poll;
}
if (msg.error.err ||
msg.head.msgh_size != sizeof msg.success ||
*(int *) &msg.success.result_type != *(int *) &inttype ||
(msg.success.result & SELECT_ALL) == 0)
{
/* Error or bogus reply. Simulate readiness. */
__mach_msg_destroy (&msg.head);
msg.success.result = SELECT_ALL;
}
/* Look up the respondent's reply port and record its
readiness. */
{
int had = got;
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
if (d[i].type
&& d[i].reply_port == msg.head.msgh_local_port)
{
d[i].type &= msg.success.result;
d[i].type |= SELECT_RETURNED;
++got;
}
assert (got > had);
}
}
if (msg.head.msgh_remote_port != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (),
msg.head.msgh_remote_port);
if (got)
poll:
{
/* Poll for another message. */
to = 0;
options |= MACH_RCV_TIMEOUT;
}
}
if (err == MACH_RCV_TIMED_OUT)
/* This is the normal value for ERR. We might have timed out and
read no messages. Otherwise, after receiving the first message,
we poll for more messages. We receive with a timeout of 0 to
effect a poll, so ERR is MACH_RCV_TIMED_OUT when the poll finds no
message waiting. */
err = 0;
if (got)
/* At least one descriptor is known to be ready now, so we will
return success. */
err = 0;
}
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
if (d[i].type)
__mach_port_destroy (__mach_task_self (), d[i].reply_port);
if (firstfd == -1 || (firstfd != lastfd && portset != MACH_PORT_NULL))
/* Destroy PORTSET, but only if it's not actually the reply port for a
single descriptor (in which case it's destroyed in the previous loop;
not doing it here is just a bit more efficient). */
__mach_port_destroy (__mach_task_self (), portset);
if (err)
return __hurd_fail (err);
/* Below we recalculate GOT to include an increment for each operation
allowed on each fd. */
got = 0;
/* Set the user bitarrays. We only ever have to clear bits, as all desired
ones are initially set. */
if (firstfd != -1)
for (i = firstfd; i <= lastfd; ++i)
{
int type = d[i].type;
if ((type & SELECT_RETURNED) == 0)
type = 0;
if (type & SELECT_READ)
got++;
else if (readfds)
FD_CLR (i, readfds);
if (type & SELECT_WRITE)
got++;
else if (writefds)
FD_CLR (i, writefds);
if (type & SELECT_URG)
got++;
else if (exceptfds)
FD_CLR (i, exceptfds);
}
return got;
} }
weak_alias (__select, select) weak_alias (__select, select)