1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* Message port manipulations
Copyright (C) 1994, 1995 Free Software Foundation
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 <mach.h>
#include <hurd.h>
#include "proc.h"
#include "process_reply_U.h"
#include <hurd/startup.h>
#include <assert.h>
#include <stdlib.h>
/* Check to see if process P is blocked trying to get the message
port of process AVAILP; if so, return its call. */
void
check_message_return (struct proc *p, void *availpaddr)
{
struct proc *availp = availpaddr;
struct getmsgport_c *c = &p->p_continuation.getmsgport_c;
if (p->p_msgportwait && c->msgp == availp)
{
proc_getmsgport_reply (c->reply_port, c->reply_port_type,
0, availp->p_msgport);
c->msgp = 0;
p->p_msgportwait = 0;
}
}
error_t
S_proc_setmsgport (struct proc *p,
mach_port_t reply, mach_msg_type_name_t replytype,
mach_port_t msgport,
mach_port_t *oldmsgport)
{
*oldmsgport = p->p_msgport;
p->p_msgport = msgport;
p->p_deadmsg = 0;
if (p->p_checkmsghangs)
prociterate (check_message_return, p);
p->p_checkmsghangs = 0;
if (p == startup_proc)
{
/* init is single-threaded. Reply to it before we expect it
to service requests. */
proc_setmsgport_reply (reply, replytype, 0, *oldmsgport);
mach_port_deallocate (mach_task_self (), *oldmsgport);
startup_essential_task (msgport, mach_task_self (), MACH_PORT_NULL,
"proc", master_host_port);
return MIG_NO_REPLY;
}
else
return 0;
}
/* Check to see if process P is blocked trying to get the message port of
process DYINGP; if so, return its call with ESRCH. */
void
check_message_dying (struct proc *p, struct proc *dyingp)
{
struct getmsgport_c *c = &p->p_continuation.getmsgport_c;
if (p->p_msgportwait && c->msgp == dyingp)
{
proc_getmsgport_reply (c->reply_port, c->reply_port_type, ESRCH,
MACH_PORT_NULL);
c->msgp = 0;
p->p_msgportwait = 0;
}
}
/* Cause a pending proc_getmsgport operation to immediately return */
void
abort_getmsgport (struct proc *p)
{
struct getmsgport_c *c = &p->p_continuation.getmsgport_c;
proc_getmsgport_reply (c->reply_port, c->reply_port_type, EINTR,
MACH_PORT_NULL);
c->msgp = 0;
p->p_msgportwait = 0;
}
error_t
S_proc_getmsgport (struct proc *callerp,
mach_port_t reply_port,
mach_msg_type_name_t reply_port_type,
pid_t pid,
mach_port_t *msgport)
{
struct proc *p = pid_find (pid);
if (!p)
return ESRCH;
if (p->p_deadmsg)
{
struct getmsgport_c *c = &callerp->p_continuation.getmsgport_c;
if (callerp->p_msgportwait || callerp->p_waiting)
return EBUSY;
c->reply_port = reply_port;
c->reply_port_type = reply_port_type;
c->msgp = p;
p->p_checkmsghangs = 1;
callerp->p_msgportwait = 1;
return MIG_NO_REPLY;
}
*msgport = p->p_msgport;
return 0;
}
void
message_port_dead (struct proc *p)
{
mach_port_deallocate (mach_task_self (), p->p_msgport);
p->p_msgport = MACH_PORT_NULL;
p->p_deadmsg = 1;
}
|
