*/
#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <common/common.h>
#include <common/kernel-ctl/kernel-ctl.h>
+#include <common/kernel-ctl/kernel-ioctl.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include "consumer.h"
#include "kernel.h"
+#include "kernel-consumer.h"
#include "kern-modules.h"
+#include "utils.h"
/*
* Add context on a kernel channel.
*/
int kernel_add_channel_context(struct ltt_kernel_channel *chan,
- struct lttng_kernel_context *ctx)
+ struct ltt_kernel_context *ctx)
{
int ret;
assert(ctx);
DBG("Adding context to channel %s", chan->channel->name);
- ret = kernctl_add_context(chan->fd, ctx);
+ ret = kernctl_add_context(chan->fd, &ctx->ctx);
if (ret < 0) {
if (errno != EEXIST) {
PERROR("add context ioctl");
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));
+ cds_list_add_tail(&ctx->list, &chan->ctx_list);
return 0;
assert(session);
/* Allocate data structure */
- lks = trace_kernel_create_session(session->path);
+ lks = trace_kernel_create_session();
if (lks == NULL) {
ret = -1;
goto error;
return 0;
error:
+ if (lks) {
+ trace_kernel_destroy_session(lks);
+ }
return ret;
}
* kernel session.
*/
int kernel_create_channel(struct ltt_kernel_session *session,
- struct lttng_channel *chan, char *path)
+ struct lttng_channel *chan)
{
int ret;
struct ltt_kernel_channel *lkc;
assert(session);
assert(chan);
- assert(path);
/* Allocate kernel channel */
- lkc = trace_kernel_create_channel(chan, path);
+ lkc = trace_kernel_create_channel(chan);
if (lkc == NULL) {
goto error;
}
- DBG3("Kernel create channel %s in %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d",
- chan->name, path, lkc->channel->attr.overwrite,
+ DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d",
+ chan->name, lkc->channel->attr.overwrite,
lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf,
lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval,
- lkc->channel->attr.output);
+ lkc->channel->attr.live_timer_interval, lkc->channel->attr.output);
/* Kernel tracer channel creation */
ret = kernctl_create_channel(session->fd, &lkc->channel->attr);
return 0;
error:
+ if (lkc) {
+ free(lkc->channel);
+ free(lkc);
+ }
return -1;
}
/*
* Create a kernel event, enable it to the kernel tracer and add it to the
* channel event list of the kernel session.
+ * We own filter_expression and filter.
*/
int kernel_create_event(struct lttng_event *ev,
struct ltt_kernel_channel *channel)
case ENOSYS:
WARN("Event type not implemented");
break;
+ case ENOENT:
+ WARN("Event %s not found!", ev->name);
+ break;
default:
PERROR("create event ioctl");
}
return ret;
}
+int kernel_enable_syscall(const char *syscall_name,
+ struct ltt_kernel_channel *channel)
+{
+ return kernctl_enable_syscall(channel->fd, syscall_name);
+}
+
+int kernel_disable_syscall(const char *syscall_name,
+ struct ltt_kernel_channel *channel)
+{
+ return kernctl_disable_syscall(channel->fd, syscall_name);
+}
+
+int kernel_track_pid(struct ltt_kernel_session *session, int pid)
+{
+ DBG("Kernel track PID %d for session id %" PRIu64 ".",
+ pid, session->id);
+ return kernctl_track_pid(session->fd, pid);
+}
+
+int kernel_untrack_pid(struct ltt_kernel_session *session, int pid)
+{
+ DBG("Kernel untrack PID %d for session id %" PRIu64 ".",
+ pid, session->id);
+ return kernctl_untrack_pid(session->fd, pid);
+}
+
/*
* Create kernel metadata, open from the kernel tracer and add it to the
* kernel session.
int kernel_open_metadata(struct ltt_kernel_session *session)
{
int ret;
- struct ltt_kernel_metadata *lkm;
+ struct ltt_kernel_metadata *lkm = NULL;
assert(session);
/* Kernel tracer metadata creation */
ret = kernctl_open_metadata(session->fd, &lkm->conf->attr);
if (ret < 0) {
- goto error;
+ goto error_open;
}
lkm->fd = ret;
return 0;
+error_open:
+ trace_kernel_destroy_metadata(lkm);
error:
return -1;
}
{
int ret;
+ DBG("Kernel flushing metadata buffer on fd %d", fd);
+
ret = kernctl_buffer_flush(fd);
if (ret < 0) {
ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret);
PERROR("fcntl session fd");
}
+ lks->tracefile_size = channel->channel->attr.tracefile_size;
+ lks->tracefile_count = channel->channel->attr.tracefile_count;
+
/* Add stream to channe stream list */
cds_list_add(&lks->list, &channel->stream_list.head);
channel->stream_count++;
*/
ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events)
{
- int fd, pos, ret;
+ int fd, ret;
char *event;
size_t nbmem, count = 0;
FILE *fp;
goto end;
}
- while (fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos) == 1) {
+ while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) {
if (count >= nbmem) {
struct lttng_event *new_elist;
+ size_t new_nbmem;
- DBG("Reallocating event list from %zu to %zu bytes", nbmem,
- nbmem * 2);
- /* Double the size */
- nbmem <<= 1;
- new_elist = realloc(elist, nbmem * sizeof(struct lttng_event));
+ new_nbmem = nbmem << 1;
+ DBG("Reallocating event list from %zu to %zu bytes",
+ nbmem, new_nbmem);
+ new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event));
if (new_elist == NULL) {
PERROR("realloc list events");
free(event);
count = -ENOMEM;
goto end;
}
+ /* Zero the new memory */
+ memset(new_elist + nbmem, 0,
+ (new_nbmem - nbmem) * sizeof(struct lttng_event));
+ nbmem = new_nbmem;
elist = new_elist;
}
strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN);
{
int ret;
struct lttng_kernel_tracer_version version;
+ struct lttng_kernel_tracer_abi_version abi_version;
ret = kernctl_tracer_version(tracer_fd, &version);
if (ret < 0) {
}
/* Validate version */
- if (version.major != KERN_MODULES_PRE_MAJOR
- && version.major != KERN_MODULES_MAJOR) {
+ if (version.major != VERSION_MAJOR) {
+ ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)",
+ version.major, VERSION_MAJOR);
goto error_version;
}
-
- DBG2("Kernel tracer version validated (major version %d)", version.major);
+ ret = kernctl_tracer_abi_version(tracer_fd, &abi_version);
+ if (ret < 0) {
+ ERR("Failed at getting lttng-modules ABI version");
+ goto error;
+ }
+ if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) {
+ ERR("Kernel tracer ABI version (%d.%d) is not compatible with expected ABI major version (%d.*)",
+ abi_version.major, abi_version.minor,
+ LTTNG_MODULES_ABI_MAJOR_VERSION);
+ goto error;
+ }
+ DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)",
+ version.major, version.minor,
+ abi_version.major, abi_version.minor);
return 0;
error_version:
- ERR("Kernel major version %d is not compatible (supporting <= %d)",
- version.major, KERN_MODULES_MAJOR)
ret = -1;
error:
DBG("Tearing down kernel session");
+ /*
+ * Destroy channels on the consumer if at least one FD has been sent and we
+ * are in no output mode because the streams are in *no* monitor mode so we
+ * have to send a command to clean them up or else they leaked.
+ */
+ if (!ksess->output_traces && ksess->consumer_fds_sent) {
+ int ret;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+
+ /* For each consumer socket. */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ struct ltt_kernel_channel *chan;
+
+ /* For each channel, ask the consumer to destroy it. */
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ ret = kernel_consumer_destroy_channel(socket, chan);
+ if (ret < 0) {
+ /* Consumer is probably dead. Use next socket. */
+ continue;
+ }
+ }
+ }
+ rcu_read_unlock();
+ }
+
/* Close any relayd session */
consumer_output_send_destroy_relayd(ksess->consumer);
ksess->channel_count--;
}
}
+
+/*
+ * Take a snapshot for a given kernel session.
+ *
+ * Return 0 on success or else return a LTTNG_ERR code.
+ */
+int kernel_snapshot_record(struct ltt_kernel_session *ksess,
+ struct snapshot_output *output, int wait,
+ uint64_t nb_packets_per_stream)
+{
+ int err, ret, saved_metadata_fd;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct ltt_kernel_metadata *saved_metadata;
+
+ assert(ksess);
+ assert(ksess->consumer);
+ assert(output);
+
+ DBG("Kernel snapshot record started");
+
+ /* Save current metadata since the following calls will change it. */
+ saved_metadata = ksess->metadata;
+ saved_metadata_fd = ksess->metadata_stream_fd;
+
+ rcu_read_lock();
+
+ ret = kernel_open_metadata(ksess);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_META_FAIL;
+ goto error;
+ }
+
+ ret = kernel_open_metadata_stream(ksess);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_META_FAIL;
+ goto error_open_stream;
+ }
+
+ /* Send metadata to consumer and snapshot everything. */
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ struct consumer_output *saved_output;
+ struct ltt_kernel_channel *chan;
+
+ /*
+ * Temporarly switch consumer output for our snapshot output. As long
+ * as the session lock is taken, this is safe.
+ */
+ saved_output = ksess->consumer;
+ ksess->consumer = output->consumer;
+
+ pthread_mutex_lock(socket->lock);
+ /* This stream must not be monitored by the consumer. */
+ ret = kernel_consumer_add_metadata(socket, ksess, 0);
+ pthread_mutex_unlock(socket->lock);
+ /* Put back the saved consumer output into the session. */
+ ksess->consumer = saved_output;
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ goto error_consumer;
+ }
+
+ /* For each channel, ask the consumer to snapshot it. */
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_snapshot_channel(socket, chan->fd, output, 0,
+ ksess->uid, ksess->gid,
+ DEFAULT_KERNEL_TRACE_DIR, wait,
+ nb_packets_per_stream);
+ pthread_mutex_unlock(socket->lock);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ (void) kernel_consumer_destroy_metadata(socket,
+ ksess->metadata);
+ goto error_consumer;
+ }
+ }
+
+ /* Snapshot metadata, */
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output,
+ 1, ksess->uid, ksess->gid,
+ DEFAULT_KERNEL_TRACE_DIR, wait, 0);
+ pthread_mutex_unlock(socket->lock);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ goto error_consumer;
+ }
+
+ /*
+ * The metadata snapshot is done, ask the consumer to destroy it since
+ * it's not monitored on the consumer side.
+ */
+ (void) kernel_consumer_destroy_metadata(socket, ksess->metadata);
+ }
+
+ ret = LTTNG_OK;
+
+error_consumer:
+ /* Close newly opened metadata stream. It's now on the consumer side. */
+ err = close(ksess->metadata_stream_fd);
+ if (err < 0) {
+ PERROR("close snapshot kernel");
+ }
+
+error_open_stream:
+ trace_kernel_destroy_metadata(ksess->metadata);
+error:
+ /* Restore metadata state.*/
+ ksess->metadata = saved_metadata;
+ ksess->metadata_stream_fd = saved_metadata_fd;
+
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Get the syscall mask array from the kernel tracer.
+ *
+ * Return 0 on success else a negative value. In both case, syscall_mask should
+ * be freed.
+ */
+int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits)
+{
+ assert(syscall_mask);
+ assert(nr_bits);
+
+ return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits);
+}
projects / lttng-tools.git / blobdiff