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glibc/hurd/report-wait.c
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/* Report on what a thread in our task is waiting for. | |
Copyright (C) 1996-2016 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <hurd.h> | |
#include <hurd/signal.h> | |
#include <hurd/fd.h> | |
#include <string.h> | |
#include <assert.h> | |
#include <hurd/msg_server.h> | |
#include <thread_state.h> | |
#include <intr-msg.h> | |
static char * | |
describe_number (string_t description, const char *flavor, long int i) | |
{ | |
unsigned long int j; | |
char *p = flavor == NULL ? description : __stpcpy (description, flavor); | |
char *end; | |
/* Handle sign. */ | |
if (i < 0) | |
{ | |
i = -i; | |
*p++ = '-'; | |
} | |
/* Allocate space for the number at the end of DESCRIPTION. */ | |
for (j = i; j >= 10; j /= 10) | |
p++; | |
end = p + 1; | |
*end = '\0'; | |
do | |
{ | |
*p-- = '0' + i % 10; | |
i /= 10; | |
} while (i != 0); | |
return end; | |
} | |
static char * | |
describe_port (string_t description, mach_port_t port) | |
{ | |
int i; | |
if (port == MACH_PORT_NULL) | |
return __stpcpy (description, "(null)"); | |
if (port == MACH_PORT_DEAD) | |
return __stpcpy (description, "(dead)"); | |
if (port == __mach_task_self ()) | |
return __stpcpy (description, "task-self"); | |
for (i = 0; i < _hurd_nports; ++i) | |
if (port == _hurd_ports[i].port) | |
return describe_number (description, "init#", i); | |
if (_hurd_init_dtable) | |
{ | |
for (i = 0; i < _hurd_init_dtablesize; ++i) | |
if (port == _hurd_init_dtable[i]) | |
return describe_number (description, "fd#", i); | |
} | |
else if (_hurd_dtable) | |
{ | |
for (i = 0; i < _hurd_dtablesize; ++i) | |
if (_hurd_dtable[i] == NULL) | |
continue; | |
else if (port == _hurd_dtable[i]->port.port) | |
return describe_number (description, "fd#", i); | |
else if (port == _hurd_dtable[i]->ctty.port) | |
return describe_number (description, "bgfd#", i); | |
} | |
return describe_number (description, "port#", port); | |
} | |
/* We want _HURD_ITIMER_THREAD, but don't want to link in the itimer code | |
unnecessarily. */ | |
#if 0 /* libc.so.0.0 needs this defined, so make it a weak alias for now. */ | |
extern thread_t _hurd_itimer_thread; /* XXX */ | |
weak_extern (_hurd_itimer_thread) | |
#else | |
static thread_t default_hurd_itimer_thread; | |
weak_alias (default_hurd_itimer_thread, _hurd_itimer_thread) | |
#endif | |
kern_return_t | |
_S_msg_report_wait (mach_port_t msgport, thread_t thread, | |
string_t description, mach_msg_id_t *msgid) | |
{ | |
*msgid = 0; | |
if (thread == _hurd_msgport_thread) | |
/* Cute. */ | |
strcpy (description, "msgport"); | |
else if (&_hurd_itimer_thread && thread == _hurd_itimer_thread) | |
strcpy (description, "itimer"); | |
else | |
{ | |
/* Make sure this is really one of our threads. */ | |
struct hurd_sigstate *ss; | |
__mutex_lock (&_hurd_siglock); | |
for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
if (ss->thread == thread) | |
break; | |
__mutex_unlock (&_hurd_siglock); | |
if (ss == NULL) | |
/* To hell with you. */ | |
return EINVAL; | |
if (ss->suspended != MACH_PORT_NULL) | |
strcpy (description, "sigsuspend"); | |
else | |
{ | |
/* Examine the thread's state to see if it is blocked in an RPC. */ | |
struct machine_thread_state state; | |
mach_msg_type_number_t count = MACHINE_THREAD_STATE_COUNT; | |
error_t err; | |
err = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR, | |
(natural_t *) &state, &count); | |
if (err) | |
return err; | |
assert (count == MACHINE_THREAD_STATE_COUNT); | |
if (SYSCALL_EXAMINE (&state, msgid)) | |
{ | |
mach_port_t send_port, rcv_port; | |
mach_msg_option_t option; | |
mach_msg_timeout_t timeout; | |
/* Blocked in a system call. */ | |
if (*msgid == -25 | |
/* mach_msg system call. Examine its parameters. */ | |
&& MSG_EXAMINE (&state, msgid, &send_port, &rcv_port, | |
&option, &timeout) == 0) | |
{ | |
char *p; | |
if (send_port != MACH_PORT_NULL && *msgid != 0) | |
{ | |
/* For the normal case of RPCs, we consider the | |
destination port to be the interesting thing | |
whether we are in fact sending or receiving at the | |
moment. That tells us who we are waiting for the | |
reply from. */ | |
if (send_port == ss->intr_port) | |
{ | |
/* This is a Hurd interruptible RPC. | |
Mark it by surrounding the port description | |
string with [...] brackets. */ | |
description[0] = '['; | |
p = describe_port (description + 1, send_port); | |
*p++ = ']'; | |
*p = '\0'; | |
} | |
else | |
(void) describe_port (description, send_port); | |
} | |
else if (rcv_port != MACH_PORT_NULL) | |
{ | |
/* This system call had no send port, but had a | |
receive port. The msgid we extracted is then just | |
some garbage or perhaps the msgid of the last | |
message this thread received, but it's not a | |
helpful thing to return. */ | |
strcpy (describe_port (description, rcv_port), ":rcv"); | |
*msgid = 0; | |
} | |
else if ((option & (MACH_RCV_MSG|MACH_RCV_TIMEOUT)) | |
== (MACH_RCV_MSG|MACH_RCV_TIMEOUT)) | |
{ | |
/* A receive with no valid port can be used for a | |
pure timeout. Report the timeout value (counted | |
in milliseconds); note this is the original total | |
time, not the time remaining. */ | |
strcpy (describe_number (description, 0, timeout), "ms"); | |
*msgid = 0; | |
} | |
else | |
{ | |
strcpy (description, "mach_msg"); | |
*msgid = 0; | |
} | |
} | |
else /* Some other system call. */ | |
{ | |
(void) describe_number (description, "syscall#", *msgid); | |
*msgid = 0; | |
} | |
} | |
else | |
description[0] = '\0'; | |
} | |
} | |
__mach_port_deallocate (__mach_task_self (), thread); | |
return 0; | |
} | |
kern_return_t | |
_S_msg_describe_ports (mach_port_t msgport, mach_port_t refport, | |
mach_port_t *ports, mach_msg_type_number_t nports, | |
char **desc, mach_msg_type_number_t *desclen) | |
{ | |
char *p, *end; | |
if (__USEPORT (AUTH, msgport != port)) | |
return EPERM; | |
end = *desc + *desclen; | |
p = *desc; | |
while (nports-- > 0) | |
{ | |
char this[200]; | |
describe_port (this, *ports++); | |
p = __stpncpy (p, this, end - p); | |
if (p == end && p[-1] != '\0') | |
return ENOMEM; | |
} | |
*desclen = p - *desc; | |
return 0; | |
} |