X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fdestroy.c;h=cac1e96fd8d1f9655f67adf084833880673027a8;hp=a179da83f576ce3700ba3d2148df6235d3b2f2fb;hb=7d81aa9fff703f8fcf35f8ac426aa37d0ffffb16;hpb=0cd3b1d4a59305a7efb608605d2e74c0ea347383

diff --git a/src/bin/lttng/commands/destroy.c b/src/bin/lttng/commands/destroy.c
index a179da83f..cac1e96fd 100644
--- a/src/bin/lttng/commands/destroy.c
+++ b/src/bin/lttng/commands/destroy.c
@@ -15,7 +15,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <popt.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -23,12 +23,27 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdbool.h>
+#include <lttng/lttng.h>
 
 #include "../command.h"
 
+#include <common/mi-lttng.h>
 #include <common/sessiond-comm/sessiond-comm.h>
+#include <common/utils.h>
 
 static char *opt_session_name;
+static int opt_destroy_all;
+static int opt_no_wait;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-destroy.1.h>
+;
+#endif
+
+/* Mi writer */
+static struct mi_writer *writer;
 
 enum {
 	OPT_HELP = 1,
@@ -38,74 +53,195 @@ enum {
 static struct poptOption long_options[] = {
 	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
 	{"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+	{"all",       'a', POPT_ARG_VAL, &opt_destroy_all, 1, 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}
 };
 
 /*
- * usage
- */
-static void usage(FILE *ofp)
-{
-	fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
-	fprintf(ofp, "\n");
-	fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
-	fprintf(ofp, "get it from the configuration directory (.lttng).\n");
-	fprintf(ofp, "\n");
-	fprintf(ofp, "  -h, --help           Show this help\n");
-	fprintf(ofp, "      --list-options   Simple listing of options\n");
-	fprintf(ofp, "\n");
-}
-
-/*
- * Destroy a session removing the config directory and unregistering to the
- * session daemon.
+ * destroy_session
+ *
+ * Unregister the provided session to the session daemon. On success, removes
+ * the default configuration.
  */
-static int destroy_session()
+static int destroy_session(struct lttng_session *session)
 {
 	int ret;
-	char *session_name, *path;
+	char *session_name = NULL;
+	bool session_was_stopped;
+	enum lttng_error_code ret_code;
+	struct lttng_destruction_handle *handle = NULL;
+        enum lttng_destruction_handle_status status;
+	bool printed_wait_msg = false;
+	enum lttng_rotation_state rotation_state;
 
-	if (opt_session_name == NULL) {
-		session_name = get_session_name();
-		if (session_name == NULL) {
-			ret = CMD_ERROR;
-			goto error;
-		}
-	} else {
-		session_name = opt_session_name;
+	ret = lttng_stop_tracing_no_wait(session->name);
+	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
+		ERR("%s", lttng_strerror(ret));
 	}
+	session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
+	if (!opt_no_wait) {
+		do {
+			ret = lttng_data_pending(session->name);
+			if (ret < 0) {
+				/* Return the data available call error. */
+				goto error;
+			}
 
-	ret = lttng_destroy_session(session_name);
-	if (ret < 0) {
-		switch (-ret) {
-		case LTTCOMM_SESS_NOT_FOUND:
-			WARN("Session name %s not found", session_name);
+			/*
+			 * Data sleep time before retrying (in usec). Don't sleep if the call
+			 * returned value indicates availability.
+			 */
+			if (ret) {
+				if (!printed_wait_msg) {
+					_MSG("Waiting for destruction of session \"%s\"",
+							session->name);
+					printed_wait_msg = true;
+					fflush(stdout);
+				}
+
+				usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
+				_MSG(".");
+				fflush(stdout);
+			}
+		} while (ret != 0);
+	}
+	if (!session_was_stopped) {
+		/*
+		 * Don't print the event and packet loss warnings since the user
+		 * already saw them when stopping the trace.
+		 */
+		print_session_stats(session->name);
+	}
+
+	ret_code = lttng_destroy_session_ext(session->name, &handle);
+	if (ret_code != LTTNG_OK) {
+		ret = -ret_code;
+		goto error;
+	}
+
+	if (opt_no_wait) {
+		goto skip_wait_rotation;
+	}
+
+	do {
+		status = lttng_destruction_handle_wait_for_completion(handle,
+				DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / USEC_PER_MSEC);
+		switch (status) {
+		case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
+			if (!printed_wait_msg) {
+				_MSG("Waiting for destruction of session \"%s\"",
+						session->name);
+				printed_wait_msg = true;
+			}
+			_MSG(".");
+			fflush(stdout);
+			break;
+		case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
 			break;
 		default:
+			ERR("Failed to wait for the completion of the destruction of session \"%s\"",
+					session->name);
+			ret = -1;
+			goto error;
+		}
+	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
+
+	status = lttng_destruction_handle_get_result(handle, &ret_code);
+	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+		ERR("Failed to get the result of session destruction");
+		ret = -1;
+		goto error;
+	}
+	if (ret_code != LTTNG_OK) {
+		ret = -LTTNG_OK;
+		goto error;
+	}
+
+	status = lttng_destruction_handle_get_rotation_state(handle,
+			&rotation_state);
+	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+		ERR("Failed to get rotation state from destruction handle");
+		goto skip_wait_rotation;
+	}
+	switch (rotation_state) {
+	case LTTNG_ROTATION_STATE_NO_ROTATION:
+		break;
+        case LTTNG_ROTATION_STATE_COMPLETED:
+	{
+		const struct lttng_trace_archive_location *location;
+
+		status = lttng_destruction_handle_get_archive_location(handle,
+				&location);
+		if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+			if (printed_wait_msg) {
+				MSG("");
+				printed_wait_msg = false;
+			}
+			ret = print_trace_archive_location(location,
+					session->name);
+			if (ret) {
+				ERR("Failed to print the location of trace archive");
+				goto skip_wait_rotation;
+			}
 			break;
 		}
-		goto free_name;
+		/* fall-through. */
+        }
+        default:
+		ERR("Failed to get the location of the rotation performed during the session's destruction");
+		goto skip_wait_rotation;
 	}
+skip_wait_rotation:
+	MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
+			session->name);
+	printed_wait_msg = false;
 
-	path = config_get_default_path();
-	if (path == NULL) {
-		ret = CMD_FATAL;
-		goto free_name;
+	session_name = get_session_name_quiet();
+	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
+		config_destroy_default();
 	}
 
-	if (opt_session_name == NULL) {
-		config_destroy(path);
-		MSG("Session %s destroyed at %s", session_name, path);
-	} else {
-		MSG("Session %s destroyed", session_name);
+	if (lttng_opt_mi) {
+		ret = mi_lttng_session(writer, session, 0);
+		if (ret) {
+			ret = CMD_ERROR;
+			goto error;
+		}
 	}
 
 	ret = CMD_SUCCESS;
+error:
+	if (printed_wait_msg) {
+		MSG("");
+	}
+	lttng_destruction_handle_destroy(handle);
+	free(session_name);
+	return ret;
+}
 
-free_name:
-	if (opt_session_name == NULL) {
-		free(session_name);
+/*
+ * destroy_all_sessions
+ *
+ * Call destroy_sessions for each registered sessions
+ */
+static int destroy_all_sessions(struct lttng_session *sessions, int count)
+{
+	int i, ret = CMD_SUCCESS;
+
+	if (count == 0) {
+		MSG("No session found, nothing to do.");
+	} else if (count < 0) {
+		ERR("%s", lttng_strerror(ret));
+		goto error;
+	}
+
+	for (i = 0; i < count; i++) {
+		ret = destroy_session(&sessions[i]);
+		if (ret < 0) {
+			goto error;
+		}
 	}
 error:
 	return ret;
@@ -116,8 +252,15 @@ error:
  */
 int cmd_destroy(int argc, const char **argv)
 {
-	int opt, ret = CMD_SUCCESS;
+	int opt;
+	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
 	static poptContext pc;
+	char *session_name = NULL;
+	const char *leftover = NULL;
+
+	struct lttng_session *sessions;
+	int count;
+	int found;
 
 	pc = poptGetContext(NULL, argc, argv, long_options, 0);
 	poptReadDefaultConfig(pc, 0);
@@ -125,23 +268,148 @@ int cmd_destroy(int argc, const char **argv)
 	while ((opt = poptGetNextOpt(pc)) != -1) {
 		switch (opt) {
 		case OPT_HELP:
-			usage(stdout);
-			goto end;
+			SHOW_HELP();
+			break;
 		case OPT_LIST_OPTIONS:
 			list_cmd_options(stdout, long_options);
-			goto end;
+			break;
 		default:
-			usage(stderr);
 			ret = CMD_UNDEFINED;
+			break;
+		}
+		goto end;
+	}
+
+	/* Mi preparation */
+	if (lttng_opt_mi) {
+		writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+		if (!writer) {
+			ret = -LTTNG_ERR_NOMEM;
+			goto end;
+		}
+
+		/* Open command element */
+		ret = mi_lttng_writer_command_open(writer,
+				mi_lttng_element_command_destroy);
+		if (ret) {
+			ret = CMD_ERROR;
+			goto end;
+		}
+
+		/* Open output element */
+		ret = mi_lttng_writer_open_element(writer,
+				mi_lttng_element_command_output);
+		if (ret) {
+			ret = CMD_ERROR;
+			goto end;
+		}
+
+		/* For validation and semantic purpose we open a sessions element */
+		ret = mi_lttng_sessions_open(writer);
+		if (ret) {
+			ret = CMD_ERROR;
 			goto end;
 		}
 	}
 
-	opt_session_name = (char*) poptGetArg(pc);
+	/* Recuperate all sessions for further operation */
+	count = lttng_list_sessions(&sessions);
+	if (count < 0) {
+		ERR("%s", lttng_strerror(count));
+		command_ret = CMD_ERROR;
+		success = 0;
+		goto mi_closing;
+	}
 
-	ret = destroy_session();
+	/* Ignore session name in case all sessions are to be destroyed */
+	if (opt_destroy_all) {
+		command_ret = destroy_all_sessions(sessions, count);
+		if (command_ret) {
+			success = 0;
+		}
+	} else {
+		opt_session_name = (char *) poptGetArg(pc);
+
+		if (!opt_session_name) {
+			/* No session name specified, lookup default */
+			session_name = get_session_name();
+			if (session_name == NULL) {
+				command_ret = CMD_ERROR;
+				success = 0;
+				goto mi_closing;
+			}
+		} else {
+			session_name = opt_session_name;
+		}
+
+		/* Find the corresponding lttng_session struct */
+		found = 0;
+		for (i = 0; i < count; i++) {
+			if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
+				found = 1;
+				command_ret = destroy_session(&sessions[i]);
+				if (command_ret) {
+					success = 0;
+				}
 
+			}
+		}
+
+		if (!found) {
+			ERR("Session name %s not found", session_name);
+			command_ret = LTTNG_ERR_SESS_NOT_FOUND;
+			success = 0;
+			goto mi_closing;
+		}
+	}
+
+	leftover = poptGetArg(pc);
+	if (leftover) {
+		ERR("Unknown argument: %s", leftover);
+		ret = CMD_ERROR;
+		success = 0;
+		goto mi_closing;
+	}
+
+mi_closing:
+	/* Mi closing */
+	if (lttng_opt_mi) {
+		/* Close sessions and output element element */
+		ret = mi_lttng_close_multi_element(writer, 2);
+		if (ret) {
+			ret = CMD_ERROR;
+			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;
+	}
+
+	if (opt_session_name == NULL) {
+		free(session_name);
+	}
+
+	/* Overwrite ret if an error occurred during destroy_session/all */
+	ret = command_ret ? command_ret : ret;
+
 	poptFreeContext(pc);
 	return ret;
 }