File: fault.c

package info (click to toggle)
netatalk 3.1.12~ds-3
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 14,756 kB
  • sloc: ansic: 104,976; sh: 8,247; xml: 7,394; perl: 1,936; makefile: 1,430; python: 1,342; yacc: 309; lex: 49
file content (164 lines) | stat: -rw-r--r-- 4,545 bytes parent folder | download | duplicates (2)
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/* 
   Unix SMB/CIFS implementation.
   Critical Fault handling
   Copyright (C) Andrew Tridgell 1992-1998
   
   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 of the License, 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.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#ifdef HAVE_BACKTRACE_SYMBOLS
#include <execinfo.h>
#endif
#include <atalk/logger.h>

#ifndef SIGNAL_CAST
#define SIGNAL_CAST (void (*)(int))
#endif
#ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0)
#endif
#define BACKTRACE_STACK_SIZE 64

static void (*cont_fn)(void *);

/*******************************************************************
 Catch a signal. This should implement the following semantics:

 1) The handler remains installed after being called.
 2) The signal should be blocked during handler execution.
********************************************************************/

static void (*CatchSignal(int signum,void (*handler)(int )))(int)
{
#ifdef HAVE_SIGACTION
	struct sigaction act;
	struct sigaction oldact;

	ZERO_STRUCT(act);

	act.sa_handler = handler;
#if 0 
	/*
	 * We *want* SIGALRM to interrupt a system call.
	 */
	if(signum != SIGALRM)
		act.sa_flags = SA_RESTART;
#endif
	sigemptyset(&act.sa_mask);
	sigaddset(&act.sa_mask,signum);
	sigaction(signum,&act,&oldact);
	return oldact.sa_handler;
#else /* !HAVE_SIGACTION */
	/* FIXME: need to handle sigvec and systems with broken signal() */
	return signal(signum, handler);
#endif
}

/*******************************************************************
 Something really nasty happened - panic !
********************************************************************/

void netatalk_panic(const char *why)
{
#ifdef HAVE_BACKTRACE_SYMBOLS
	void *backtrace_stack[BACKTRACE_STACK_SIZE];
	size_t backtrace_size;
	char **backtrace_strings;

	/* get the backtrace (stack frames) */
	backtrace_size = backtrace(backtrace_stack,BACKTRACE_STACK_SIZE);
	backtrace_strings = backtrace_symbols(backtrace_stack, backtrace_size);

	LOG(log_severe, logtype_default, "PANIC: %s", why);
	LOG(log_severe, logtype_default, "BACKTRACE: %d stack frames:", backtrace_size);
	
	if (backtrace_strings) {
		size_t i;

		for (i = 0; i < backtrace_size; i++)
			LOG(log_severe, logtype_default, " #%u %s", i, backtrace_strings[i]);

		SAFE_FREE(backtrace_strings);
	}
#endif
}


/*******************************************************************
report a fault
********************************************************************/
static void fault_report(int sig)
{
	static int counter;

	if (counter)
        abort();

	counter++;

	LOG(log_severe, logtype_default, "===============================================================");
	LOG(log_severe, logtype_default, "INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)getpid(),VERSION);
	LOG(log_severe, logtype_default, "===============================================================");
  
	netatalk_panic("internal error");

	if (cont_fn) {
		cont_fn(NULL);
#ifdef SIGSEGV
		CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGBUS
		CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL);
#endif
		return; /* this should cause a core dump */
	}
    abort();
}

/****************************************************************************
catch serious errors
****************************************************************************/
static void sig_fault(int sig)
{
	fault_report(sig);
}

/*******************************************************************
setup our fault handlers
********************************************************************/
void fault_setup(void (*fn)(void *))
{
	cont_fn = fn;

#ifdef SIGSEGV
	CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGBUS
	CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
#endif
}