ret = kernctl_create_event(channel->fd, event->event);
if (ret < 0) {
- ERR("Unable to enable event %s for channel %s", ev->name, channel->channel->name);
- goto error;
+ perror("create event ioctl");
+ goto free_event;
}
event->fd = ret;
+ event->enabled = 1;
/* Prevent fd duplication after execlp() */
ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC);
if (ret < 0) {
/* Add event to event list */
cds_list_add(&event->list, &channel->events_list.head);
- DBG("Event %s enabled (fd: %d)", ev->name, event->fd);
+ DBG("Event %s created (fd: %d)", ev->name, event->fd);
+
+ return 0;
+
+free_event:
+ free(event);
+error:
+ return -1;
+}
+
+/*
+ * kernel_disable_event
+ *
+ * Disable a kernel event for a specific channel.
+ */
+int kernel_disable_event(char *event_name, struct ltt_kernel_channel *channel)
+{
+ int ret;
+ struct ltt_kernel_event *iter;
+
+ cds_list_for_each_entry(iter, &channel->events_list.head, list) {
+ if (strcmp(iter->event->name, event_name) == 0) {
+ ret = kernctl_disable(iter->fd);
+ if (ret < 0) {
+ perror("disable event ioctl");
+ goto error;
+ }
+
+ iter->enabled = 0;
+ DBG("Kernel event %s disabled (fd: %d)", iter->event->name, iter->fd);
+ break;
+ }
+ }
return 0;
--- /dev/null
+/*
+ * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define _GNU_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 "cmd.h"
+#include "conf.h"
+#include "utils.h"
+
+static char *opt_event_list;
+static char *opt_kernel;
+static char *opt_cmd_name;
+static char *opt_channel_name;
+static int opt_pid_all;
+static int opt_userspace;
+static int opt_disable_all;
+static pid_t opt_pid;
+
+enum {
+ OPT_HELP = 1,
+ OPT_USERSPACE,
+};
+
+static struct poptOption long_options[] = {
+ /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+ {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+ {"all-events", 'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
+ {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
+ {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
+ {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
+ {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
+ {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+
+/*
+ * usage
+ */
+static void usage(FILE *ofp)
+{
+ fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
+ fprintf(ofp, "\n");
+ fprintf(ofp, " -h, --help Show this help\n");
+ fprintf(ofp, " -c, --channel Apply on this channel\n");
+ fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
+ fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
+ fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
+ fprintf(ofp, " --all If -u, apply on all traceable apps\n");
+ fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
+ fprintf(ofp, "\n");
+}
+
+/*
+ * disable_events
+ *
+ * Disabling event using the lttng API.
+ */
+static int disable_events(void)
+{
+ int err, ret = CMD_SUCCESS;
+ char *event_name, *channel_name;
+ struct lttng_event ev;
+
+ if (set_session_name() < 0) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ if (opt_channel_name == NULL) {
+ err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
+ if (err < 0) {
+ ret = CMD_FATAL;
+ goto error;
+ }
+ } else {
+ channel_name = opt_channel_name;
+ }
+
+ if (opt_disable_all) {
+ if (opt_kernel) {
+ ret = lttng_kernel_disable_event(NULL, channel_name);
+ goto error;
+ }
+
+ /* TODO: User-space tracer */
+ }
+
+ /* Strip event list */
+ event_name = strtok(opt_event_list, ",");
+ while (event_name != NULL) {
+ /* Kernel tracer action */
+ if (opt_kernel) {
+ DBG("Disabling kernel event %s for channel %s",
+ event_name, channel_name);
+
+ /* Copy name and type of the event */
+ strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
+ ret = lttng_kernel_disable_event(event_name, channel_name);
+ if (ret < 0) {
+ MSG("Unable to disable event %s for channel %s",
+ event_name, channel_name);
+ } else {
+ MSG("Kernel event %s disabled for channel %s",
+ event_name, channel_name);
+ }
+ } else if (opt_userspace) { /* User-space tracer action */
+ /*
+ * TODO: Waiting on lttng UST 2.0
+ */
+ if (opt_pid_all) {
+ } else if (opt_pid != 0) {
+ }
+ ret = CMD_NOT_IMPLEMENTED;
+ goto error;
+ } else {
+ ERR("Please specify a tracer (kernel or user-space)");
+ goto error;
+ }
+
+ /* Next event */
+ event_name = strtok(NULL, ",");
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * cmd_disable_events
+ *
+ * Disable event to trace session
+ */
+int cmd_disable_events(int argc, const char **argv)
+{
+ int opt, ret;
+ static poptContext pc;
+
+ pc = poptGetContext(NULL, argc, argv, long_options, 0);
+ poptReadDefaultConfig(pc, 0);
+
+ while ((opt = poptGetNextOpt(pc)) != -1) {
+ switch (opt) {
+ case OPT_HELP:
+ usage(stderr);
+ ret = CMD_SUCCESS;
+ goto end;
+ case OPT_USERSPACE:
+ opt_userspace = 1;
+ opt_cmd_name = poptGetOptArg(pc);
+ break;
+ default:
+ usage(stderr);
+ ret = CMD_UNDEFINED;
+ goto end;
+ }
+ }
+
+ opt_event_list = (char*) poptGetArg(pc);
+ if (opt_event_list == NULL && opt_disable_all == 0) {
+ ERR("Missing event name(s).\n");
+ usage(stderr);
+ ret = CMD_SUCCESS;
+ goto end;
+ }
+
+ ret = disable_events();
+
+end:
+ return ret;
+}
projects / lttng-tools.git / commitdiff
