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/* By-hand stubs for some RPC calls
Copyright (C) 1994,96,99,2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <cthreads.h>
#include <stdlib.h>
#include <hurd/hurd_types.h>
#include <mach/message.h>
#include <string.h>
#include <assert.h>
#include "proc.h"
/* From hurd/msg.defs: */
#define RPCID_SIG_POST 23000
struct msg_sig_post_request
{
mach_msg_header_t head;
mach_msg_type_t signaltype;
int signal;
mach_msg_type_t sigcode_type;
natural_t sigcode;
mach_msg_type_t refporttype;
mach_port_t refport;
};
/* Send the Mach message indicated by msg_spec. call cthread_exit
when it has been delivered. */
static any_t
blocking_message_send (any_t arg)
{
struct msg_sig_post_request *const req = arg;
error_t err;
err = mach_msg (&req->head, MACH_SEND_MSG, sizeof *req, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
switch (err)
{
/* These are the codes that mean a pseudo-receive modified
the message buffer and we might need to clean up the send rights.
None of them should be possible in our usage. */
case MACH_SEND_TIMED_OUT:
case MACH_SEND_INTERRUPTED:
case MACH_SEND_INVALID_NOTIFY:
case MACH_SEND_NO_NOTIFY:
case MACH_SEND_NOTIFY_IN_PROGRESS:
assert_perror (err);
break;
default: /* Other errors are safe to ignore. */
break;
}
return 0;
}
/* Send signal SIGNO to MSGPORT with REFPORT as reference. Don't
block in any fashion. */
void
send_signal (mach_port_t msgport,
int signal,
mach_port_t refport)
{
error_t err;
/* This message buffer might be modified by mach_msg in some error cases,
so we cannot safely use a shared static buffer. */
struct msg_sig_post_request message =
{
{
/* Message header: */
(MACH_MSGH_BITS_COMPLEX
| MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND,
MACH_MSG_TYPE_MAKE_SEND_ONCE)), /* msgh_bits */
sizeof message, /* msgh_size */
msgport, /* msgh_remote_port */
MACH_PORT_NULL, /* msgh_local_port */
0, /* msgh_seqno */
RPCID_SIG_POST, /* msgh_id */
},
{
/* Type descriptor for signo */
MACH_MSG_TYPE_INTEGER_32, /* msgt_name */
32, /* msgt_size */
1, /* msgt_number */
1, /* msgt_inline */
0, /* msgt_longform */
0, /* msgt_deallocate */
0, /* msgt_unused */
},
/* Signal number */
signal,
/* Type descriptor for sigcode */
{
MACH_MSG_TYPE_INTEGER_32, /* msgt_name */
32, /* msgt_size */
1, /* msgt_number */
1, /* msgt_inline */
0, /* msgt_longform */
0, /* msgt_deallocate */
0, /* msgt_unused */
},
/* Sigcode */
0,
{
/* Type descriptor for refport */
MACH_MSG_TYPE_COPY_SEND, /* msgt_name */
32, /* msgt_size */
1, /* msgt_number */
1, /* msgt_inline */
0, /* msgt_longform */
0, /* msgt_deallocate */
0, /* msgt_unused */
},
refport
};
err = mach_msg ((mach_msg_header_t *)&message,
MACH_SEND_MSG|MACH_SEND_TIMEOUT, sizeof message, 0,
MACH_PORT_NULL, 0, MACH_PORT_NULL);
switch (err)
{
case MACH_SEND_TIMED_OUT:
/* The send could not complete immediately, and we do not want to
block. We'll fork off another thread to do the blocking send.
The message buffer was modified by a pseudo-receive operation, so
we need to copy its modified contents into a malloc'd buffer. */
{
struct msg_sig_post_request *copy = malloc (sizeof *copy);
if (copy)
{
memcpy (copy, &message, sizeof message);
cthread_detach (cthread_fork (blocking_message_send, copy));
}
break;
}
/* These are the other codes that mean a pseudo-receive modified
the message buffer and we might need to clean up the send rights.
None of them should be possible in our usage. */
case MACH_SEND_INTERRUPTED:
case MACH_SEND_INVALID_NOTIFY:
case MACH_SEND_NO_NOTIFY:
case MACH_SEND_NOTIFY_IN_PROGRESS:
assert_perror (err);
break;
default: /* Other errors are safe to ignore. */
break;
}
}
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