+/**
+ * The child process we spawn
+ */
+static struct GNUNET_OS_Process *child;
+
+/**
+ * The arguments including the binary to spawn
+ */
+static char **argv2;
+
+/**
+ * Pipe used to communicate shutdown via signal.
+ */
+static struct GNUNET_DISK_PipeHandle *sigpipe;
+
+/**
+ * Filename of the unique file
+ */
+static char *fn;
+
+/**
+ * Handle to the unique file
+ */
+static int fh;
+
+/**
+ * The return code of the binary
+ */
+static unsigned long child_exit_code;
+
+/**
+ * The process status of the child
+ */
+static enum GNUNET_OS_ProcessStatusType child_status;
+
+/**
+ * The shutdown task
+ */
+static GNUNET_SCHEDULER_TaskIdentifier shutdown_task_id;
+
+/**
+ * Task to kill the child
+ */
+static GNUNET_SCHEDULER_TaskIdentifier terminate_task_id;
+
+/**
+ * Task to kill the child
+ */
+static GNUNET_SCHEDULER_TaskIdentifier child_death_task_id;
+
+/**
+ * The shutdown task
+ */
+static void
+shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ shutdown_task_id = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != child_exit_code)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING, "Child exited with error code: %lu\n",
+ child_exit_code);
+ ret = 128 + (int) child_exit_code;
+ }
+ if (0 != fh)
+ {
+ close (fh);
+ }
+ if ((NULL != fn) && (0 != unlink (fn)))
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "open");
+ ret = GNUNET_SYSERR;
+ }
+}
+
+
+static void
+terminate_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ static int hard_kill;
+
+ GNUNET_assert (NULL != child);
+ terminate_task_id =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
+ &terminate_task, NULL);
+ if (0 != hard_kill)
+ {
+ switch (hard_kill)
+ {
+ case 1:
+ case 2:
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "%d more interrupts needed to send SIGKILL to the child\n",
+ 3 - hard_kill);
+ hard_kill++;
+ return;
+ case 3:
+ GNUNET_break (0 == GNUNET_OS_process_kill (child, SIGKILL));
+ return;
+ }
+ }
+ hard_kill++;
+ GNUNET_break (0 == GNUNET_OS_process_kill (child, GNUNET_TERM_SIG));
+ LOG (GNUNET_ERROR_TYPE_INFO, _("Waiting for child to exit.\n"));
+}
+
+
+/**
+ * Task triggered whenever we receive a SIGCHLD (child
+ * process died).
+ *
+ * @param cls closure, NULL if we need to self-restart
+ * @param tc context
+ */
+static void
+child_death_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ const struct GNUNET_DISK_FileHandle *pr;
+ char c[16];
+
+ pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
+ child_death_task_id = GNUNET_SCHEDULER_NO_TASK;
+ if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
+ {
+ child_death_task_id =
+ GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+ pr, &child_death_task, NULL);
+ return;
+ }
+ /* consume the signal */
+ GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof (c)));
+ LOG_DEBUG ("Child died\n");
+ GNUNET_SCHEDULER_cancel (terminate_task_id);
+ terminate_task_id = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (GNUNET_OK == GNUNET_OS_process_status (child, &child_status,
+ &child_exit_code));
+ GNUNET_OS_process_destroy (child);
+ child = NULL;
+ shutdown_task_id = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
+}
+
+
+static void
+destroy_hosts(struct GNUNET_TESTBED_Host **hosts, unsigned int nhosts)
+{
+ unsigned int host;
+
+ GNUNET_assert (NULL != hosts);
+ for (host = 0; host < nhosts; host++)
+ if (NULL != hosts[host])
+ GNUNET_TESTBED_host_destroy (hosts[host]);
+ GNUNET_free (hosts);
+ hosts = NULL;
+}
+
+
+/**
+ * The main scheduler run task
+ *
+ * @param cls NULL
+ * @param tc scheduler task context
+ */
+static void
+run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TESTBED_Host **hosts;
+ const struct GNUNET_CONFIGURATION_Handle *null_cfg;
+ char *tmpdir;
+ char *hostname;
+ size_t hostname_len;
+ unsigned int nhosts;
+
+ null_cfg = GNUNET_CONFIGURATION_create ();
+ nhosts = GNUNET_TESTBED_hosts_load_from_loadleveler (null_cfg, &hosts);
+ if (0 == nhosts)
+ {
+ GNUNET_break (0);
+ ret = GNUNET_SYSERR;
+ return;
+ }
+ hostname_len = GNUNET_OS_get_hostname_max_length ();
+ hostname = GNUNET_malloc (hostname_len);
+ if (0 != gethostname (hostname, hostname_len))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR, "Cannot get hostname. Exiting\n");
+ GNUNET_free (hostname);
+ destroy_hosts (hosts, nhosts);
+ ret = GNUNET_SYSERR;
+ return;
+ }
+ if (NULL == strstr (GNUNET_TESTBED_host_get_hostname (hosts[0]), hostname))
+ {
+ LOG_DEBUG ("Exiting as `%s' is not the lowest host\n", hostname);
+ GNUNET_free (hostname);
+ ret = GNUNET_OK;
+ return;
+ }
+ LOG_DEBUG ("Will be executing `%s' on host `%s'\n", argv2[0], hostname);
+ GNUNET_free (hostname);
+ destroy_hosts (hosts, nhosts);
+ tmpdir = getenv ("TMPDIR");
+ if (NULL == tmpdir)
+ tmpdir = getenv ("TMP");
+ if (NULL == tmpdir)
+ tmpdir = getenv ("TEMP");
+ if (NULL == tmpdir)
+ tmpdir = "/tmp";
+ (void) GNUNET_asprintf (&fn, "%s/gnunet-testbed-spawn.lock", tmpdir);
+ /* Open the unique file; we can create it then we can spawn the child process
+ else we exit */
+ fh = open (fn, O_CREAT | O_EXCL | O_CLOEXEC,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (-1 == fh)
+ {
+ if (EEXIST == errno)
+ {
+ LOG_DEBUG ("Lock file already created by other process. Exiting\n");
+ ret = GNUNET_OK;
+ return;
+ }
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "open");
+ ret = GNUNET_SYSERR;
+ return;
+ }
+ /* Spawn the new process here */
+ LOG (GNUNET_ERROR_TYPE_INFO, _("Spawning process `%s'\n"), argv2[0]);
+ child = GNUNET_OS_start_process_vap (GNUNET_NO, GNUNET_OS_INHERIT_STD_ALL, NULL,
+ NULL, NULL,
+ argv2[0], argv2);
+ if (NULL == child)
+ {
+ GNUNET_break (0);
+ ret = GNUNET_SYSERR;
+ shutdown_task_id = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
+ return;
+ }
+ ret = GNUNET_OK;
+ terminate_task_id =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
+ &terminate_task, NULL);
+ child_death_task_id =
+ GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_DISK_pipe_handle (sigpipe,
+ GNUNET_DISK_PIPE_END_READ),
+ &child_death_task, NULL);
+}
+
+
+/**
+ * Signal handler called for SIGCHLD.
+ */
+static void
+sighandler_child_death ()
+{
+ static char c;
+ int old_errno = errno; /* back-up errno */
+
+ GNUNET_break (1 ==
+ GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
+ (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
+ &c, sizeof (c)));
+ errno = old_errno; /* restore errno */
+}
+