source: trunk/samba/source/lib/fault.c @ 26

Last change on this file since 26 was 26, checked in by Paul Smedley, 14 years ago

Updated source to 3.0.25rc1

File size: 5.1 KB
Line 
1/*
2   Unix SMB/CIFS implementation.
3   Critical Fault handling
4   Copyright (C) Andrew Tridgell 1992-1998
5   
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10   
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15   
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19*/
20
21#include "includes.h"
22
23#ifdef HAVE_SYS_PRCTL_H
24#include <sys/prctl.h>
25#endif
26
27static void (*cont_fn)(void *);
28static pstring corepath;
29
30/*******************************************************************
31report a fault
32********************************************************************/
33static void fault_report(int sig)
34{
35        static int counter;
36
37        if (counter) _exit(1);
38
39        counter++;
40
41        DEBUGSEP(0);
42        DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING));
43        DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n"));
44        DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n"));
45        DEBUGSEP(0);
46 
47        smb_panic("internal error");
48
49        if (cont_fn) {
50                cont_fn(NULL);
51#ifdef SIGSEGV
52                CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL);
53#endif
54#ifdef SIGBUS
55                CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL);
56#endif
57#ifdef SIGABRT
58                CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
59#endif
60                return; /* this should cause a core dump */
61        }
62        exit(1);
63}
64
65/****************************************************************************
66catch serious errors
67****************************************************************************/
68static void sig_fault(int sig)
69{
70        fault_report(sig);
71}
72
73/*******************************************************************
74setup our fault handlers
75********************************************************************/
76void fault_setup(void (*fn)(void *))
77{
78        cont_fn = fn;
79
80#ifdef SIGSEGV
81        CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault);
82#endif
83#ifdef SIGBUS
84        CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
85#endif
86#ifdef SIGABRT
87        CatchSignal(SIGABRT,SIGNAL_CAST sig_fault);
88#endif
89}
90
91/*******************************************************************
92make all the preparations to safely dump a core file
93********************************************************************/
94
95void dump_core_setup(const char *progname)
96{
97        pstring logbase;
98        char * end;
99
100        if (lp_logfile() && *lp_logfile()) {
101                snprintf(logbase, sizeof(logbase), "%s", lp_logfile());
102                if ((end = strrchr_m(logbase, '/'))) {
103                        *end = '\0';
104                }
105        } else {
106                /* We will end up here is the log file is given on the command
107                 * line by the -l option but the "log file" option is not set
108                 * in smb.conf.
109                 */
110                snprintf(logbase, sizeof(logbase), "%s", dyn_LOGFILEBASE);
111        }
112
113        SMB_ASSERT(progname != NULL);
114
115        snprintf(corepath, sizeof(corepath), "%s/cores", logbase);
116        mkdir(corepath,0700);
117
118        snprintf(corepath, sizeof(corepath), "%s/cores/%s",
119                logbase, progname);
120        mkdir(corepath,0700);
121
122        sys_chown(corepath,getuid(),getgid());
123        chmod(corepath,0700);
124
125#ifdef HAVE_GETRLIMIT
126#ifdef RLIMIT_CORE
127        {
128                struct rlimit rlp;
129                getrlimit(RLIMIT_CORE, &rlp);
130                rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
131                setrlimit(RLIMIT_CORE, &rlp);
132                getrlimit(RLIMIT_CORE, &rlp);
133                DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
134                         (int)rlp.rlim_cur,(int)rlp.rlim_max));
135        }
136#endif
137#endif
138
139#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
140        /* On Linux we lose the ability to dump core when we change our user
141         * ID. We know how to dump core safely, so let's make sure we have our
142         * dumpable flag set.
143         */
144        prctl(PR_SET_DUMPABLE, 1);
145#endif
146
147        /* FIXME: if we have a core-plus-pid facility, configurably set
148         * this up here.
149         */
150}
151
152 void dump_core(void)
153{
154        /* Note that even if core dumping has been disabled, we still set up
155         * the core path. This is to handle the case where core dumping is
156         * turned on in smb.conf and the relevant daemon is not restarted.
157         */
158        if (!lp_enable_core_files()) {
159                DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
160                exit(1);
161        }
162
163#if DUMP_CORE
164        if (*corepath != '\0') {
165                /* The chdir might fail if we dump core before we finish
166                 * processing the config file.
167                 */
168                if (chdir(corepath) != 0) {
169                        DEBUG(0, ("unable to change to %s\n", corepath));
170                        DEBUGADD(0, ("refusing to dump core\n"));
171                        exit(1);
172                }
173
174                DEBUG(0,("dumping core in %s\n", corepath));
175        }
176
177        umask(~(0700));
178        dbgflush();
179
180        /* Ensure we don't have a signal handler for abort. */
181#ifdef SIGABRT
182        CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
183#endif
184
185        abort();
186
187#else /* DUMP_CORE */
188        exit(1);
189#endif /* DUMP_CORE */
190}
191
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