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ovsdb-idl: Remove prototype for function that is not defined or used.
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064af421 1/*
482557e5 2 * Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
064af421 3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
064af421 7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
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15 */
16
17#include <config.h>
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18#include <errno.h>
19#include <fcntl.h>
d0b99d38 20#include <inttypes.h>
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21#include <string.h>
22#include <unistd.h>
0e6644c3 23
064af421 24#include "backtrace.h"
e6211adc 25#include "openvswitch/vlog.h"
e2ed6fbe 26#include "util.h"
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27
28VLOG_DEFINE_THIS_MODULE(backtrace);
0e6644c3 29
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30#ifdef HAVE_BACKTRACE
31#include <execinfo.h>
32void
33backtrace_capture(struct backtrace *b)
34{
35 void *frames[BACKTRACE_MAX_FRAMES];
36 int i;
37
38 b->n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);
39 for (i = 0; i < b->n_frames; i++) {
40 b->frames[i] = (uintptr_t) frames[i];
41 }
42}
d0b99d38 43
482557e5 44#else
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45void
46backtrace_capture(struct backtrace *backtrace)
47{
e4fd8d28 48 backtrace->n_frames = 0;
064af421 49}
0e6644c3 50#endif
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51
52static char *
53backtrace_format(const struct backtrace *b, struct ds *ds)
54{
55 if (b->n_frames) {
56 int i;
57
58 ds_put_cstr(ds, " (backtrace:");
59 for (i = 0; i < b->n_frames; i++) {
60 ds_put_format(ds, " 0x%08"PRIxPTR, b->frames[i]);
61 }
62 ds_put_cstr(ds, ")");
63 }
64
65 return ds_cstr(ds);
66}
67
68void
69log_backtrace_at(const char *msg, const char *where)
70{
71 struct backtrace b;
72 struct ds ds = DS_EMPTY_INITIALIZER;
73
74 backtrace_capture(&b);
75 if (msg) {
76 ds_put_format(&ds, "%s ", msg);
77 }
78
79 ds_put_cstr(&ds, where);
80 VLOG_ERR("%s", backtrace_format(&b, &ds));
81
82 ds_destroy(&ds);
83}
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84
85#ifdef HAVE_UNWIND
86void
87log_received_backtrace(int fd) {
88 int byte_read;
89 struct unw_backtrace backtrace[UNW_MAX_DEPTH];
90
91 VLOG_WARN("%s fd %d", __func__, fd);
92 fcntl(fd, F_SETFL, O_NONBLOCK);
93 memset(backtrace, 0, UNW_MAX_BUF);
94
95 byte_read = read(fd, backtrace, UNW_MAX_BUF);
96 if (byte_read < 0) {
97 VLOG_ERR("Read fd %d failed: %s", fd,
98 ovs_strerror(errno));
99 } else if (byte_read > 0) {
100 VLOG_WARN("SIGSEGV detected, backtrace:");
101 for (int i = 0; i < UNW_MAX_DEPTH; i++) {
102 if (backtrace[i].func[0] == 0) {
103 break;
104 }
0b265306 105 VLOG_WARN("0x%016"PRIxPTR" <%s+0x%"PRIxPTR">\n",
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106 backtrace[i].ip,
107 backtrace[i].func,
108 backtrace[i].offset);
109 }
110 }
111}
112#else /* !HAVE_UNWIND */
113void
114log_received_backtrace(int daemonize_fd OVS_UNUSED) {
115 VLOG_WARN("Backtrace using libunwind not supported.");
116}
117#endif /* HAVE_UNWIND */