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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <time.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/stat.h>
#include <unistd.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <svmdb.h>
#include <vppinfra/format.h>
#include <vppinfra/error.h>
#include <vppinfra/time.h>
#include <vppinfra/macros.h>
int
restart_main_fn (unformat_input_t * i)
{
int verbose = 0;
int old_pid;
int wait;
u8 *chroot_path = 0;
svmdb_client_t *svmdb_client;
volatile pid_t *pidp;
struct stat statb;
ino_t old_inode;
int sleeps;
svmdb_map_args_t _ma, *ma = &_ma;
struct timespec _req, *req = &_req;
struct timespec _rem, *rem = &_rem;
if (geteuid ())
clib_error ("vpp_restart: must be root...");
while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
{
if (unformat (i, "verbose") || unformat (i, "v"))
verbose = 1;
else if (unformat (i, "chroot %s", &chroot_path))
;
else
{
clib_error ("unknown input `%U'", format_unformat_error, i);
return 1;
}
}
/*
* Step 1: look up the current VPP pid in the shared-memory database
*/
memset (ma, 0, sizeof (*ma));
ma->root_path = (char *) chroot_path;
svmdb_client = svmdb_map (ma);
pidp = svmdb_local_get_variable_reference (svmdb_client,
SVMDB_NAMESPACE_VEC, "vpp_pid");
if (pidp == 0)
{
clib_error ("'vpp_pid' svm variable not found, vpp has never run?");
return 2;
}
/* Spin for up to 10 seconds for vpp to start */
for (wait = 0; wait < 1000; wait++)
{
req->tv_sec = 0;
req->tv_nsec = 10000 * 1000; /* 10 ms */
while (nanosleep (req, rem) < 0)
*req = *rem;
if (*pidp)
goto found2;
}
clib_error ("VPP not runnning...");
return 3;
found2:
old_pid = *pidp;
/*
* Step 2: sanity check the pid we discovered
*/
if (verbose)
fformat (stdout, "Sanity check current vpp pid %d\n", old_pid);
if (kill (old_pid, 0) < 0)
{
svmdb_unmap (svmdb_client);
clib_error ("vpp current pid %d not running...", old_pid);
return 2;
}
if (verbose)
fformat (stdout, "Sanity check vpp pid %d OK\n", old_pid);
/*
* Step 3: figure out the current vpp <--> client shared-VM file
* inode number
*/
if (stat ("/dev/shm/vpe-api", &statb) < 0)
{
clib_unix_error ("stat fail");
return 4;
}
old_inode = statb.st_ino;
if (verbose)
fformat (stdout, "Old inode %u\n", old_inode);
/* Note: restart wipes out the shared VM database */
svmdb_unmap (svmdb_client);
/*
* Step 4: send SIGTERM to vpp.
* systemd et al. will restart vpp after wiping out the shared-VM
* database and (crucially) the shared API messaging segment
*/
if (kill (old_pid, SIGTERM) < 0)
{
clib_unix_error ("SIGTERM fail");
return 3;
}
sleeps = 0;
/*
* Step 5: wait up to 15 seconds for a new incarnation of
* the shared-VM API segment to appear.
*/
for (wait = 0; wait < 150; wait++)
{
if ((stat ("/dev/shm/vpe-api", &statb) < 0)
|| statb.st_ino == old_inode)
{
req->tv_sec = 0;
req->tv_nsec = 100000 * 1000; /* 100 ms */
while (nanosleep (req, rem) < 0)
*req = *rem;
sleeps++;
}
else
goto new_inode;
}
clib_error ("Timeout waiting for new inode to appear...");
return 5;
new_inode:
if (verbose && sleeps > 0)
fformat (stdout, "Inode sleeps %d\n", sleeps);
if (verbose)
fformat (stdout, "New inode %u\n", statb.st_ino);
/*
* Step 6: remap the SVM database
*/
svmdb_client = svmdb_map (ma);
pidp = svmdb_local_get_variable_reference (svmdb_client,
SVMDB_NAMESPACE_VEC, "vpp_pid");
if (pidp == 0)
{
clib_error ("post_restart: 'vpp_pid' svm variable not found,"
"vpp did not restart?");
return 2;
}
sleeps = 0;
/*
* Step 7: wait for vpp to publish its new PID
*/
/* Spin for up to 15 seconds */
for (wait = 0; wait < 150; wait++)
{
if (*pidp && (*pidp != old_pid))
goto restarted;
req->tv_sec = 0;
req->tv_nsec = 100000 * 1000; /* 100 ms */
while (nanosleep (req, rem) < 0)
*req = *rem;
sleeps++;
}
clib_error ("Timeout waiting for vpp to publish pid after restart...");
return 4;
restarted:
/* Done... */
if (verbose && sleeps)
fformat (stdout, "pid sleeps %d\n", sleeps);
if (verbose)
fformat (stdout, "New PID %d... Restarted...\n", *pidp);
svmdb_unmap (svmdb_client);
return 0;
}
int
main (int argc, char **argv)
{
unformat_input_t i;
int ret;
clib_mem_init (0, 64ULL << 20);
unformat_init_command_line (&i, argv);
ret = restart_main_fn (&i);
unformat_free (&i);
return ret;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
