+++ /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; only version 2
- * of the License.
- *
- * 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 <errno.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <lttng-kernel-ctl.h>
-#include <lttngerr.h>
-
-#include "kernel.h"
-
-/*
- * Add context on a kernel channel.
- */
-int kernel_add_channel_context(struct ltt_kernel_channel *chan,
- struct lttng_kernel_context *ctx)
-{
- int ret;
-
- DBG("Adding context to channel %s", chan->channel->name);
- ret = kernctl_add_context(chan->fd, ctx);
- if (ret < 0) {
- if (errno != EEXIST) {
- perror("add context ioctl");
- } else {
- /* If EEXIST, we just ignore the error */
- ret = 0;
- }
- goto error;
- }
-
- chan->ctx = zmalloc(sizeof(struct lttng_kernel_context));
- if (chan->ctx == NULL) {
- perror("zmalloc event context");
- goto error;
- }
-
- memcpy(chan->ctx, ctx, sizeof(struct lttng_kernel_context));
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Add context on a kernel event.
- */
-int kernel_add_event_context(struct ltt_kernel_event *event,
- struct lttng_kernel_context *ctx)
-{
- int ret;
-
- DBG("Adding context to event %s", event->event->name);
- ret = kernctl_add_context(event->fd, ctx);
- if (ret < 0) {
- perror("add context ioctl");
- goto error;
- }
-
- event->ctx = zmalloc(sizeof(struct lttng_kernel_context));
- if (event->ctx == NULL) {
- perror("zmalloc event context");
- goto error;
- }
-
- memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context));
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Create a new kernel session, register it to the kernel tracer and add it to
- * the session daemon session.
- */
-int kernel_create_session(struct ltt_session *session, int tracer_fd)
-{
- int ret;
- struct ltt_kernel_session *lks;
-
- /* Allocate data structure */
- lks = trace_kernel_create_session(session->path);
- if (lks == NULL) {
- ret = -1;
- goto error;
- }
-
- /* Kernel tracer session creation */
- ret = kernctl_create_session(tracer_fd);
- if (ret < 0) {
- perror("ioctl kernel create session");
- goto error;
- }
-
- lks->fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- lks->consumer_fds_sent = 0;
- session->kernel_session = lks;
-
- DBG("Kernel session created (fd: %d)", lks->fd);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Create a kernel channel, register it to the kernel tracer and add it to the
- * kernel session.
- */
-int kernel_create_channel(struct ltt_kernel_session *session,
- struct lttng_channel *chan, char *path)
-{
- int ret;
- struct ltt_kernel_channel *lkc;
-
- /* Allocate kernel channel */
- lkc = trace_kernel_create_channel(chan, path);
- if (lkc == NULL) {
- goto error;
- }
-
- /* Kernel tracer channel creation */
- ret = kernctl_create_channel(session->fd, &lkc->channel->attr);
- if (ret < 0) {
- perror("ioctl kernel create channel");
- goto error;
- }
-
- /* Setup the channel fd */
- lkc->fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- /* Add channel to session */
- cds_list_add(&lkc->list, &session->channel_list.head);
- session->channel_count++;
-
- DBG("Kernel channel %s created (fd: %d and path: %s)",
- lkc->channel->name, lkc->fd, lkc->pathname);
-
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Create a kernel event, enable it to the kernel tracer and add it to the
- * channel event list of the kernel session.
- */
-int kernel_create_event(struct lttng_event *ev,
- struct ltt_kernel_channel *channel)
-{
- int ret;
- struct ltt_kernel_event *event;
-
- event = trace_kernel_create_event(ev);
- if (event == NULL) {
- ret = -1;
- goto error;
- }
-
- ret = kernctl_create_event(channel->fd, event->event);
- if (ret < 0) {
- if (errno != EEXIST) {
- PERROR("create event ioctl");
- }
- ret = -errno;
- goto free_event;
- }
-
- /*
- * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. However
- * this FD must not be added to the event list.
- */
- if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) {
- DBG2("Kernel event syscall creation success");
- goto end;
- }
-
- event->fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- /* Add event to event list */
- cds_list_add(&event->list, &channel->events_list.head);
- channel->event_count++;
-
- DBG("Event %s created (fd: %d)", ev->name, event->fd);
-
-end:
- return 0;
-
-free_event:
- free(event);
-error:
- return ret;
-}
-
-/*
- * Disable a kernel channel.
- */
-int kernel_disable_channel(struct ltt_kernel_channel *chan)
-{
- int ret;
-
- ret = kernctl_disable(chan->fd);
- if (ret < 0) {
- perror("disable chan ioctl");
- ret = errno;
- goto error;
- }
-
- chan->enabled = 0;
- DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Enable a kernel channel.
- */
-int kernel_enable_channel(struct ltt_kernel_channel *chan)
-{
- int ret;
-
- ret = kernctl_enable(chan->fd);
- if (ret < 0 && errno != EEXIST) {
- perror("Enable kernel chan");
- goto error;
- }
-
- chan->enabled = 1;
- DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Enable a kernel event.
- */
-int kernel_enable_event(struct ltt_kernel_event *event)
-{
- int ret;
-
- ret = kernctl_enable(event->fd);
- if (ret < 0 && errno != EEXIST) {
- perror("enable kernel event");
- goto error;
- }
-
- event->enabled = 1;
- DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Disable a kernel event.
- */
-int kernel_disable_event(struct ltt_kernel_event *event)
-{
- int ret;
-
- ret = kernctl_disable(event->fd);
- if (ret < 0 && errno != EEXIST) {
- perror("disable kernel event");
- goto error;
- }
-
- event->enabled = 0;
- DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Create kernel metadata, open from the kernel tracer and add it to the
- * kernel session.
- */
-int kernel_open_metadata(struct ltt_kernel_session *session, char *path)
-{
- int ret;
- struct ltt_kernel_metadata *lkm;
-
- /* Allocate kernel metadata */
- lkm = trace_kernel_create_metadata(path);
- if (lkm == NULL) {
- goto error;
- }
-
- /* Kernel tracer metadata creation */
- ret = kernctl_open_metadata(session->fd, &lkm->conf->attr);
- if (ret < 0) {
- goto error;
- }
-
- lkm->fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- session->metadata = lkm;
-
- DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname);
-
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Start tracing session.
- */
-int kernel_start_session(struct ltt_kernel_session *session)
-{
- int ret;
-
- ret = kernctl_start_session(session->fd);
- if (ret < 0) {
- perror("ioctl start session");
- goto error;
- }
-
- DBG("Kernel session started");
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Make a kernel wait to make sure in-flight probe have completed.
- */
-void kernel_wait_quiescent(int fd)
-{
- int ret;
-
- DBG("Kernel quiescent wait on %d", fd);
-
- ret = kernctl_wait_quiescent(fd);
- if (ret < 0) {
- perror("wait quiescent ioctl");
- ERR("Kernel quiescent wait failed");
- }
-}
-
-/*
- * Kernel calibrate
- */
-int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
-{
- int ret;
-
- ret = kernctl_calibrate(fd, calibrate);
- if (ret < 0) {
- perror("calibrate ioctl");
- return -1;
- }
-
- return 0;
-}
-
-
-/*
- * Force flush buffer of metadata.
- */
-int kernel_metadata_flush_buffer(int fd)
-{
- int ret;
-
- ret = kernctl_buffer_flush(fd);
- if (ret < 0) {
- ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret);
- }
-
- return 0;
-}
-
-/*
- * Force flush buffer for channel.
- */
-int kernel_flush_buffer(struct ltt_kernel_channel *channel)
-{
- int ret;
- struct ltt_kernel_stream *stream;
-
- DBG("Flush buffer for channel %s", channel->channel->name);
-
- cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
- DBG("Flushing channel stream %d", stream->fd);
- ret = kernctl_buffer_flush(stream->fd);
- if (ret < 0) {
- perror("ioctl");
- ERR("Fail to flush buffer for stream %d (ret: %d)",
- stream->fd, ret);
- }
- }
-
- return 0;
-}
-
-/*
- * Stop tracing session.
- */
-int kernel_stop_session(struct ltt_kernel_session *session)
-{
- int ret;
-
- ret = kernctl_stop_session(session->fd);
- if (ret < 0) {
- goto error;
- }
-
- DBG("Kernel session stopped");
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Open stream of channel, register it to the kernel tracer and add it
- * to the stream list of the channel.
- *
- * Return the number of created stream. Else, a negative value.
- */
-int kernel_open_channel_stream(struct ltt_kernel_channel *channel)
-{
- int ret;
- struct ltt_kernel_stream *lks;
-
- while ((ret = kernctl_create_stream(channel->fd)) > 0) {
- lks = trace_kernel_create_stream();
- if (lks == NULL) {
- close(ret);
- goto error;
- }
-
- lks->fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- ret = asprintf(&lks->pathname, "%s/%s_%d",
- channel->pathname, channel->channel->name, channel->stream_count);
- if (ret < 0) {
- perror("asprintf kernel create stream");
- goto error;
- }
-
- /* Add stream to channe stream list */
- cds_list_add(&lks->list, &channel->stream_list.head);
- channel->stream_count++;
-
- DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)",
- channel->stream_count, lks->fd, lks->state, lks->pathname);
- }
-
- return channel->stream_count;
-
-error:
- return -1;
-}
-
-/*
- * Open the metadata stream and set it to the kernel session.
- */
-int kernel_open_metadata_stream(struct ltt_kernel_session *session)
-{
- int ret;
-
- ret = kernctl_create_stream(session->metadata->fd);
- if (ret < 0) {
- perror("kernel create metadata stream");
- goto error;
- }
-
- DBG("Kernel metadata stream created (fd: %d)", ret);
- session->metadata_stream_fd = ret;
- /* Prevent fd duplication after execlp() */
- ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl session fd");
- }
-
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Get the event list from the kernel tracer and return the number of elements.
- */
-ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events)
-{
- int fd, pos;
- char *event;
- size_t nbmem, count = 0;
- ssize_t size;
- FILE *fp;
- struct lttng_event *elist;
-
- fd = kernctl_tracepoint_list(tracer_fd);
- if (fd < 0) {
- perror("kernel tracepoint list");
- goto error;
- }
-
- fp = fdopen(fd, "r");
- if (fp == NULL) {
- perror("kernel tracepoint list fdopen");
- goto error_fp;
- }
-
- /*
- * Init memory size counter
- * See kernel-ctl.h for explanation of this value
- */
- nbmem = KERNEL_EVENT_LIST_SIZE;
- elist = zmalloc(sizeof(struct lttng_event) * nbmem);
-
- while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
- if (count > nbmem) {
- DBG("Reallocating event list from %zu to %zu bytes", nbmem,
- nbmem + KERNEL_EVENT_LIST_SIZE);
- /* Adding the default size again */
- nbmem += KERNEL_EVENT_LIST_SIZE;
- elist = realloc(elist, nbmem * sizeof(struct lttng_event));
- if (elist == NULL) {
- perror("realloc list events");
- count = -ENOMEM;
- goto end;
- }
- }
- strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN);
- elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- elist[count].enabled = -1;
- count++;
- }
-
- *events = elist;
- DBG("Kernel list events done (%zu events)", count);
-end:
- fclose(fp); /* closes both fp and fd */
- return count;
-
-error_fp:
- close(fd);
-error:
- return -1;
-}
projects / lttng-tools.git / blobdiff