*
* Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <common/sessiond-comm/sessiond-comm.h>
#include <lttng/lttng.h>
+#include "filter-parser.h"
+#include "filter-ast.h"
+#include "filter-bytecode.h"
+#include "memstream.h"
+
+#ifdef DEBUG
+const int print_xml = 1;
+#define dbg_printf(fmt, args...) \
+ printf("[debug liblttng-ctl] " fmt, ## args)
+#else
+const int print_xml = 0;
+#define dbg_printf(fmt, args...) \
+do { \
+ /* do nothing but check printf format */ \
+ if (0) \
+ printf("[debug liblttnctl] " fmt, ## args); \
+} while (0)
+#endif
+
+
/* Socket to session daemon for communication */
static int sessiond_socket;
static char sessiond_sock_path[PATH_MAX];
static char *tracing_group;
static int connected;
+/* Global */
+
+/*
+ * Those two variables are used by error.h to silent or control the verbosity of
+ * error message. They are global to the library so application linking with it
+ * are able to compile correctly and also control verbosity of the library.
+ *
+ * Note that it is *not* possible to silent ERR() and PERROR() macros.
+ */
+int lttng_opt_quiet;
+int lttng_opt_verbose;
+
/*
* Copy string from src to dst and enforce null terminated byte.
*/
{
if (src && dst) {
switch (src->type) {
- case LTTNG_DOMAIN_KERNEL:
- case LTTNG_DOMAIN_UST:
- /*
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- */
- memcpy(dst, src, sizeof(struct lttng_domain));
- break;
- default:
- memset(dst, 0, sizeof(struct lttng_domain));
- dst->type = LTTNG_DOMAIN_KERNEL;
- break;
+ case LTTNG_DOMAIN_KERNEL:
+ case LTTNG_DOMAIN_UST:
+ /*
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ */
+ memcpy(dst, src, sizeof(struct lttng_domain));
+ break;
+ default:
+ memset(dst, 0, sizeof(struct lttng_domain));
+ dst->type = LTTNG_DOMAIN_KERNEL;
+ break;
}
}
}
return ret;
}
+/*
+ * Send var len data to the session daemon.
+ *
+ * On success, returns the number of bytes sent (>=0)
+ * On error, returns -1
+ */
+static int send_session_varlen(void *data, size_t len)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -ENOTCONN;
+ goto end;
+ }
+ if (!data || !len) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
+
+end:
+ return ret;
+}
+
/*
* Receive data from the sessiond socket.
*
/*
* Ask the session daemon a specific command and put the data into buf.
+ * Takes extra var. len. data as input to send to the session daemon.
*
* Return size of data (only payload, not header) or a negative error code.
*/
-static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
+static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
+ void *vardata,
+ size_t varlen,
+ void **buf)
{
int ret;
size_t size;
if (ret < 0) {
goto end;
}
+ /* Send var len data */
+ ret = send_session_varlen(vardata, varlen);
+ if (ret < 0) {
+ goto end;
+ }
/* Get header from data transmission */
ret = recv_data_sessiond(&llm, sizeof(llm));
return ret;
}
+/*
+ * Ask the session daemon a specific command and put the data into buf.
+ *
+ * Return size of data (only payload, not header) or a negative error code.
+ */
+static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
+{
+ return ask_sessiond_varlen(lsm, NULL, 0, buf);
+}
+
/*
* Create lttng handle and return pointer.
* The returned pointer will be NULL in case of malloc() error.
return ask_sessiond(&lsm, NULL);
}
+/*
+ * set filter for an event
+ * Return negative error value on error.
+ * Return size of returned session payload data if OK.
+ */
+
+int lttng_set_event_filter(struct lttng_handle *handle,
+ const char *event_name, const char *channel_name,
+ const char *filter_expression)
+{
+ struct lttcomm_session_msg lsm;
+ struct filter_parser_ctx *ctx;
+ FILE *fmem;
+ int ret = 0;
+
+ /* Safety check. */
+ if (handle == NULL) {
+ return -1;
+ }
+
+ if (!filter_expression) {
+ return 0;
+ }
+
+ /*
+ * casting const to non-const, as the underlying function will
+ * use it in read-only mode.
+ */
+ fmem = lttng_fmemopen((void *) filter_expression,
+ strlen(filter_expression), "r");
+ if (!fmem) {
+ fprintf(stderr, "Error opening memory as stream\n");
+ return -ENOMEM;
+ }
+ ctx = filter_parser_ctx_alloc(fmem);
+ if (!ctx) {
+ fprintf(stderr, "Error allocating parser\n");
+ ret = -ENOMEM;
+ goto alloc_error;
+ }
+ ret = filter_parser_ctx_append_ast(ctx);
+ if (ret) {
+ fprintf(stderr, "Parse error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ ret = filter_visitor_set_parent(ctx);
+ if (ret) {
+ fprintf(stderr, "Set parent error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ if (print_xml) {
+ ret = filter_visitor_print_xml(ctx, stdout, 0);
+ if (ret) {
+ fflush(stdout);
+ fprintf(stderr, "XML print error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ }
+
+ dbg_printf("Generating IR... ");
+ fflush(stdout);
+ ret = filter_visitor_ir_generate(ctx);
+ if (ret) {
+ fprintf(stderr, "Generate IR error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+
+ dbg_printf("Validating IR... ");
+ fflush(stdout);
+ ret = filter_visitor_ir_check_binary_op_nesting(ctx);
+ if (ret) {
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+
+ dbg_printf("Generating bytecode... ");
+ fflush(stdout);
+ ret = filter_visitor_bytecode_generate(ctx);
+ if (ret) {
+ fprintf(stderr, "Generate bytecode error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+ dbg_printf("Size of bytecode generated: %u bytes.\n",
+ bytecode_get_len(&ctx->bytecode->b));
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_SET_FILTER;
+
+ /* Copy channel name */
+ copy_string(lsm.u.filter.channel_name, channel_name,
+ sizeof(lsm.u.filter.channel_name));
+ /* Copy event name */
+ copy_string(lsm.u.filter.event_name, event_name,
+ sizeof(lsm.u.filter.event_name));
+ lsm.u.filter.bytecode_len = sizeof(ctx->bytecode->b)
+ + bytecode_get_len(&ctx->bytecode->b);
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
+ lsm.u.filter.bytecode_len, NULL);
+
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ if (fclose(fmem) != 0) {
+ perror("fclose");
+ }
+ return ret;
+
+parse_error:
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+alloc_error:
+ if (fclose(fmem) != 0) {
+ perror("fclose");
+ }
+ return ret;
+}
+
/*
* Disable event(s) of a channel and domain.
* If no event name is specified, all events are disabled.
return ret / sizeof(struct lttng_event);
}
+/*
+ * Lists all available tracepoint fields of domain.
+ * Sets the contents of the event field array.
+ * Returns the number of lttng_event_field entries in events;
+ * on error, returns a negative value.
+ */
+int lttng_list_tracepoint_fields(struct lttng_handle *handle,
+ struct lttng_event_field **fields)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ ret = ask_sessiond(&lsm, (void **) fields);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event_field);
+}
+
/*
* Returns a human readable string describing
* the error code (a negative value).
return ask_sessiond(&lsm, NULL);
}
+/*
+ * Create a new tracing session using a name, URIs and a consumer enable flag.
+ */
+int lttng_create_session_uri(const char *name, struct lttng_uri *ctrl_uri,
+ struct lttng_uri *data_uri, unsigned int enable_consumer)
+{
+ struct lttcomm_session_msg lsm;
+
+ /* Name and ctrl_uri are mandatory */
+ if (name == NULL || ctrl_uri == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_CREATE_SESSION_URI;
+
+ copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ /* Anything bigger than zero, the consumer(s) will be enabled */
+ lsm.u.create_uri.enable_consumer = enable_consumer;
+ memcpy(&lsm.u.create_uri.ctrl_uri, ctrl_uri,
+ sizeof(lsm.u.create_uri.ctrl_uri));
+ if (data_uri) {
+ /*
+ * The only possible scenario where data_uri is NULL is for a local
+ * consumer where the output is at a specified path name on the
+ * filesystem.
+ */
+ memcpy(&lsm.u.create_uri.data_uri, data_uri,
+ sizeof(lsm.u.create_uri.data_uri));
+ }
+
+ return ask_sessiond(&lsm, NULL);
+}
+
/*
* Destroy session using name.
* Returns size of returned session payload data or a negative error code.
void lttng_channel_set_default_attr(struct lttng_domain *domain,
struct lttng_channel_attr *attr)
{
- memset(attr, 0, sizeof(struct lttng_channel_attr));
-
/* Safety check */
if (attr == NULL || domain == NULL) {
return;
}
+ memset(attr, 0, sizeof(struct lttng_channel_attr));
+
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
return 1;
}
+/*
+ * Set URI for a consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_set_consumer_uri(struct lttng_handle *handle, struct lttng_uri *uri)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL || uri == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ memcpy(&lsm.u.uri, uri, sizeof(lsm.u.uri));
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Enable consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_enable_consumer(struct lttng_handle *handle)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_ENABLE_CONSUMER;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Disable consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_disable_consumer(struct lttng_handle *handle)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_DISABLE_CONSUMER;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ return ask_sessiond(&lsm, NULL);
+}
+
/*
* lib constructor
*/
projects / lttng-tools.git / blobdiff