Tue Jul 9 09:37:55 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
[glibc.git] / hurd / report-wait.c
blob9c7a4074fd53f01b9c4b2ca2145467bed0bfd139
1 /* Report on what a thread in our task is waiting for.
2 Copyright (C) 1996 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
18 Cambridge, MA 02139, USA. */
20 #include <hurd.h>
21 #include <hurd/signal.h>
22 #include <hurd/fd.h>
23 #include <string.h>
24 #include <assert.h>
25 #include <hurd/msg_server.h>
26 #include "thread_state.h"
27 #include "intr-msg.h"
29 static void
30 describe_number (string_t description, const char *flavor, unsigned long i)
32 int j;
33 char *p = __stpcpy (description, flavor);
35 /* Allocate space for the number at the end of DESCRIPTION. */
36 for (j = i; j >= 10; j /= 10)
37 p++;
38 p[1] = '\0';
42 *p-- = '0' + i % 10;
43 i /= 10;
44 } while (i != 0);
45 assert (*p == '#');
48 static void
49 describe_port (string_t description, mach_port_t port)
51 int i;
53 if (port == __mach_task_self ())
55 strcpy (description, "task-self");
56 return;
59 for (i = 0; i < _hurd_nports; ++i)
60 if (port == _hurd_ports[i].port)
62 describe_number (description, "init#", i);
63 return;
66 if (_hurd_init_dtable)
68 for (i = 0; i < _hurd_init_dtablesize; ++i)
69 if (port == _hurd_init_dtable[i])
71 describe_number (description, "fd#", i);
72 return;
75 else if (_hurd_dtable)
77 for (i = 0; i < _hurd_dtablesize; ++i)
78 if (_hurd_dtable[i] == NULL)
79 continue;
80 else if (port == _hurd_dtable[i]->port.port)
82 describe_number (description, "fd#", i);
83 return;
85 else if (port == _hurd_dtable[i]->ctty.port)
87 describe_number (description, "bgfd#", i);
88 return;
92 describe_number (description, "port#", port);
96 /* Common defn so we don't link in the itimer code unnecssarily. */
97 thread_t _hurd_itimer_thread; /* XXX */
99 kern_return_t
100 _S_msg_report_wait (mach_port_t msgport, thread_t thread,
101 string_t description, int *msgid)
103 *msgid = 0;
105 if (thread == _hurd_msgport_thread)
106 /* Cute. */
107 strcpy (description, "msgport");
108 else if (thread == _hurd_itimer_thread)
109 strcpy (description, "itimer");
110 else
112 /* Make sure this is really one of our threads. */
114 struct hurd_sigstate *ss;
116 __mutex_lock (&_hurd_siglock);
117 for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
118 if (ss->thread == thread)
119 break;
120 __mutex_unlock (&_hurd_siglock);
121 if (ss == NULL)
122 /* To hell with you. */
123 return EINVAL;
125 if (ss->suspended != MACH_PORT_NULL)
126 strcpy (description, "sigsuspend");
127 else
129 /* Examine the thread's state to see if it is blocked in an RPC. */
131 struct machine_thread_state state;
132 mach_msg_type_number_t count = MACHINE_THREAD_STATE_COUNT;
133 error_t err;
135 err = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
136 (integer_t *) &state, &count);
137 if (err)
138 return err;
139 assert (count == MACHINE_THREAD_STATE_COUNT);
140 if (SYSCALL_EXAMINE (&state, msgid))
142 /* Blocked in a system call. */
143 if (*msgid == -25)
144 /* mach_msg system call. Examine its parameters. */
145 describe_port (description, MSG_EXAMINE (&state, msgid));
146 else
147 strcpy (description, "kernel");
149 else
150 description[0] = '\0';
154 __mach_port_deallocate (__mach_task_self (), thread);
155 return 0;
158 kern_return_t
159 _S_msg_describe_ports (mach_port_t msgport, mach_port_t refport,
160 mach_port_t *ports, mach_msg_type_number_t nports,
161 char **desc, mach_msg_type_number_t *desclen)
163 char *p, *end;
165 if (__USEPORT (AUTH, msgport != port))
166 return EPERM;
168 end = *desc + *desclen;
169 p = *desc;
170 while (nports-- > 0)
172 char this[200];
173 describe_port (this, *ports++);
174 p = __stpncpy (p, this, end - p);
175 if (p == end && p[-1] != '\0')
176 return ENOMEM;
179 *desclen = p - *desc;
180 return 0;