--- /dev/null
+/*
+ * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _LGPL_SOURCE
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/mi-lttng.h>
+
+#include "../command.h"
+#include <lttng/rotation.h>
+
+static char *opt_session_name;
+static int opt_no_wait;
+static struct mi_writer *writer;
+
+enum {
+ OPT_HELP = 1,
+ OPT_LIST_OPTIONS,
+};
+
+static struct poptOption long_options[] = {
+ /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+ {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+ {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+ {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+
+static int mi_output_rotate(const char *status, const char *path,
+ const char *session_name)
+{
+ int ret;
+
+ if (!lttng_opt_mi) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_rotation);
+ if (ret) {
+ goto end;
+ }
+
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_session_name, session_name);
+ if (ret) {
+ goto end;
+ }
+
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_rotate_status, status);
+ if (ret) {
+ goto end;
+ }
+ if (path) {
+ ret = mi_lttng_writer_write_element_string(writer,
+ config_element_path, path);
+ if (ret) {
+ goto end;
+ }
+ }
+ /* Close rotation element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static int rotate_tracing(char *session_name)
+{
+ int ret;
+ struct lttng_rotation_immediate_attr *attr = NULL;
+ struct lttng_rotation_handle *handle = NULL;
+ enum lttng_rotation_status rotation_status;
+ enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING;
+
+ DBG("Rotating the output files of session %s", session_name);
+
+ attr = lttng_rotation_immediate_attr_create();
+ if (!attr) {
+ goto error;
+ }
+
+ ret = lttng_rotation_immediate_attr_set_session_name(attr, session_name);
+ if (ret < 0) {
+ ERR("Session name exceeds the maximal allowed length");
+ goto error;
+ }
+
+ ret = lttng_rotate_session(attr, &handle);
+ if (ret < 0) {
+ switch (-ret) {
+ case LTTNG_ERR_SESSION_NOT_STARTED:
+ WARN("Tracing session %s not started yet", session_name);
+ break;
+ default:
+ ERR("%s", lttng_strerror(ret));
+ break;
+ }
+ goto error;
+ }
+
+ if (!opt_no_wait) {
+ _MSG("Waiting for rotation to complete");
+ ret = fflush(stdout);
+ if (ret) {
+ PERROR("fflush");
+ goto error;
+ }
+
+ do {
+ rotation_status = lttng_rotation_handle_get_state(handle,
+ &rotation_state);
+ if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
+ ERR("Failed to query the state of the rotation");
+ goto error;
+ }
+
+ /*
+ * Data sleep time before retrying (in usec). Don't
+ * sleep if the call returned value indicates
+ * availability.
+ */
+ if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
+ ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
+ if (ret) {
+ PERROR("usleep");
+ goto error;
+ }
+ _MSG(".");
+
+ ret = fflush(stdout);
+ if (ret) {
+ PERROR("fflush");
+ goto error;
+ }
+ }
+ } while (rotation_state == LTTNG_ROTATION_STATE_ONGOING);
+ MSG("");
+ }
+
+ switch (rotation_state) {
+ case LTTNG_ROTATION_STATE_COMPLETED:
+ {
+ const char *path;
+
+ rotation_status = lttng_rotation_handle_get_completed_archive_location(
+ handle, &path);
+ if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
+ ERR("Failed to retrieve the rotation's completed chunk archive location");
+ goto error;
+ }
+ MSG("Trace chunk archive for session %s is now readable at %s",
+ session_name, path);
+ ret = mi_output_rotate("completed", path, session_name);
+ if (ret) {
+ goto error;
+ }
+ ret = CMD_SUCCESS;
+ goto end;
+ }
+ case LTTNG_ROTATION_STATE_EXPIRED:
+ MSG("Session %s rotated, but handle expired", session_name);
+ ret = mi_output_rotate("expired", NULL, session_name);
+ if (ret) {
+ goto error;
+ }
+ ret = CMD_SUCCESS;
+ goto end;
+ default:
+ ERR("Unexpected rotation state received, aborting...");
+ goto error;
+ }
+
+error:
+ ret = CMD_ERROR;
+end:
+ lttng_rotation_handle_destroy(handle);
+ lttng_rotation_immediate_attr_destroy(attr);
+ return ret;
+}
+
+/*
+ * cmd_rotate
+ *
+ * The 'rotate <options>' first level command
+ */
+int cmd_rotate(int argc, const char **argv)
+{
+ int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
+ int popt_ret;
+ static poptContext pc;
+ char *session_name = NULL;
+ bool free_session_name = false;
+
+ pc = poptGetContext(NULL, argc, argv, long_options, 0);
+ popt_ret = poptReadDefaultConfig(pc, 0);
+ if (popt_ret) {
+ ret = CMD_ERROR;
+ ERR("poptReadDefaultConfig");
+ goto end;
+ }
+
+ while ((opt = poptGetNextOpt(pc)) != -1) {
+ switch (opt) {
+ case OPT_HELP:
+ SHOW_HELP();
+ goto end;
+ case OPT_LIST_OPTIONS:
+ list_cmd_options(stdout, long_options);
+ goto end;
+ default:
+ ret = CMD_UNDEFINED;
+ goto end;
+ }
+ }
+
+ opt_session_name = (char*) poptGetArg(pc);
+
+ if (!opt_session_name) {
+ session_name = get_session_name();
+ if (!session_name) {
+ goto end;
+ }
+ free_session_name = true;
+ } else {
+ session_name = opt_session_name;
+ }
+
+ /* Mi check */
+ if (lttng_opt_mi) {
+ writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+ if (!writer) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ /* Open rotate command */
+ ret = mi_lttng_writer_command_open(writer,
+ mi_lttng_element_command_rotate);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Open output element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_command_output);
+ if (ret) {
+ goto end;
+ }
+
+ /* Open rotations element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_rotations);
+ if (ret) {
+ goto end;
+ }
+
+ }
+
+ command_ret = rotate_tracing(session_name);
+ if (command_ret) {
+ success = 0;
+ }
+
+ /* Mi closing */
+ if (lttng_opt_mi) {
+ /* Close rotations element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto end;
+ }
+ /* Close output element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto end;
+ }
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_command_success, success);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+end:
+ /* Mi clean-up */
+ if (writer && mi_lttng_writer_destroy(writer)) {
+ /* Preserve original error code */
+ ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+ }
+
+ /* Overwrite ret if an error occurred with start_tracing */
+ ret = command_ret ? command_ret : ret;
+ poptFreeContext(pc);
+ if (free_session_name) {
+ free(session_name);
+ }
+ return ret;
+}
projects / lttng-tools.git / blobdiff