--- /dev/null
+/*
+ * 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 <svm/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:
+ */
Code Review / vpp.git / blobdiff