#include <grp.h>
#include <limits.h>
#include <pthread.h>
+#include <semaphore.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include "liblttsessiondcomm.h"
#include "ltt-sessiond.h"
#include "lttngerr.h"
+#include "kernel-ctl.h"
+#include "ust-ctl.h"
#include "session.h"
-#include "trace.h"
#include "traceable-app.h"
+#include "lttng-kconsumerd.h"
/*
* TODO:
/* Const values */
const char default_home_dir[] = DEFAULT_HOME_DIR;
-const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
+const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
-/* Static functions */
-static int check_existing_daemon(void);
-static int ust_connect_app(pid_t pid);
-static int init_daemon_socket(void);
-static int notify_apps(const char* name);
-static int process_client_msg(int sock, struct lttcomm_session_msg*);
-static int send_unix_sock(int sock, void *buf, size_t len);
-static int set_signal_handler(void);
-static int set_permissions(void);
-static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_header *llh);
-static int create_lttng_rundir(void);
-static int set_kconsumerd_sockets(void);
-static void cleanup(void);
-static void copy_common_data(struct lttcomm_lttng_header *llh, struct lttcomm_session_msg *lsm);
-static void sighandler(int sig);
-
-static void *thread_manage_clients(void *data);
-static void *thread_manage_apps(void *data);
-static void *thread_manage_kconsumerd(void *data);
-
/* Variables */
-int opt_verbose;
-int opt_quiet;
+int opt_verbose; /* Not static for lttngerr.h */
+int opt_quiet; /* Not static for lttngerr.h */
const char *progname;
const char *opt_tracing_group;
static int opt_sig_parent;
static int opt_daemon;
static int is_root; /* Set to 1 if the daemon is running as root */
-static pid_t ppid;
+static pid_t ppid; /* Parent PID for --sig-parent option */
+static pid_t kconsumerd_pid;
static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
+/* Sockets and FDs */
static int client_sock;
static int apps_sock;
static int kconsumerd_err_sock;
+static int kconsumerd_cmd_sock;
+static int kernel_tracer_fd;
+
+/* Pthread, Mutexes and Semaphores */
+static pthread_t kconsumerd_thread;
+static pthread_t apps_thread;
+static pthread_t client_thread;
+static sem_t kconsumerd_sem;
+
+static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
+
+/*
+ * teardown_kernel_session
+ *
+ * Complete teardown of a kernel session. This free all data structure
+ * related to a kernel session and update counter.
+ */
+static void teardown_kernel_session(struct ltt_session *session)
+{
+ if (session->kernel_session != NULL) {
+ DBG("Tearing down kernel session");
+ trace_destroy_kernel_session(session->kernel_session);
+ /* Extra precaution */
+ session->kernel_session = NULL;
+ /* Decrement session count */
+ session->kern_session_count--;
+ }
+}
+
+/*
+ * cleanup
+ *
+ * Cleanup the daemon on exit
+ */
+static void cleanup()
+{
+ int ret;
+ char *cmd;
+ struct ltt_session *sess;
+
+ DBG("Cleaning up");
+
+ /* <fun> */
+ MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
+ MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
+ /* </fun> */
+
+ /* Stopping all threads */
+ DBG("Terminating all threads");
+ pthread_cancel(client_thread);
+ pthread_cancel(apps_thread);
+ if (kconsumerd_pid != 0) {
+ pthread_cancel(kconsumerd_thread);
+ }
+
+ DBG("Unlinking all unix socket");
+ unlink(client_unix_sock_path);
+ unlink(apps_unix_sock_path);
+ unlink(kconsumerd_err_unix_sock_path);
+
+ DBG("Removing %s directory", LTTNG_RUNDIR);
+ ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
+ if (ret < 0) {
+ ERR("asprintf failed. Something is really wrong!");
+ }
+
+ /* Remove lttng run directory */
+ ret = system(cmd);
+ if (ret < 0) {
+ ERR("Unable to clean " LTTNG_RUNDIR);
+ }
+
+ DBG("Cleaning up all session");
+ /* Cleanup ALL session */
+ cds_list_for_each_entry(sess, <t_session_list.head, list) {
+ teardown_kernel_session(sess);
+ // TODO complete session cleanup (including UST)
+ }
+
+ close(kernel_tracer_fd);
+}
+
+/*
+ * send_unix_sock
+ *
+ * Send data on a unix socket using the liblttsessiondcomm API.
+ *
+ * Return lttcomm error code.
+ */
+static int send_unix_sock(int sock, void *buf, size_t len)
+{
+ /* Check valid length */
+ if (len <= 0) {
+ return -1;
+ }
-/* Extern in session.h */
-struct ltt_session *current_session;
+ return lttcomm_send_unix_sock(sock, buf, len);
+}
+
+/*
+ * clean_command_ctx
+ *
+ * Free memory of a command context structure.
+ */
+static void clean_command_ctx(struct command_ctx *cmd_ctx)
+{
+ DBG("Clean command context structure %p", cmd_ctx);
+ if (cmd_ctx) {
+ if (cmd_ctx->llm) {
+ free(cmd_ctx->llm);
+ }
+ if (cmd_ctx->lsm) {
+ free(cmd_ctx->lsm);
+ }
+ free(cmd_ctx);
+ cmd_ctx = NULL;
+ }
+}
+
+/*
+ * ust_connect_app
+ *
+ * Return a socket connected to the libust communication socket
+ * of the application identified by the pid.
+ *
+ * If the pid is not found in the traceable list,
+ * return -1 to indicate error.
+ */
+static int ust_connect_app(pid_t pid)
+{
+ int sock;
+ struct ltt_traceable_app *lta;
+
+ DBG("Connect to application pid %d", pid);
+
+ lta = find_app_by_pid(pid);
+ if (lta == NULL) {
+ /* App not found */
+ DBG("Application pid %d not found", pid);
+ return -1;
+ }
+
+ sock = ustctl_connect_pid(lta->pid);
+ if (sock < 0) {
+ ERR("Fail connecting to the PID %d\n", pid);
+ }
+
+ return sock;
+}
+
+/*
+ * notify_apps
+ *
+ * Notify apps by writing 42 to a named pipe using name.
+ * Every applications waiting for a ltt-sessiond will be notified
+ * and re-register automatically to the session daemon.
+ *
+ * Return open or write error value.
+ */
+static int notify_apps(const char *name)
+{
+ int fd;
+ int ret = -1;
+
+ DBG("Notify the global application pipe");
+
+ /* Try opening the global pipe */
+ fd = open(name, O_WRONLY);
+ if (fd < 0) {
+ goto error;
+ }
+
+ /* Notify by writing on the pipe */
+ ret = write(fd, "42", 2);
+ if (ret < 0) {
+ perror("write");
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * setup_lttng_msg
+ *
+ * Setup the outgoing data buffer for the response (llm) by allocating the
+ * right amount of memory and copying the original information from the lsm
+ * structure.
+ *
+ * Return total size of the buffer pointed by buf.
+ */
+static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
+{
+ int ret, buf_size, trace_name_size;
+
+ /*
+ * Check for the trace_name. If defined, it's part of the payload data of
+ * the llm structure.
+ */
+ trace_name_size = strlen(cmd_ctx->lsm->trace_name);
+ buf_size = trace_name_size + size;
+
+ cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
+ if (cmd_ctx->llm == NULL) {
+ perror("malloc");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ /* Copy common data */
+ cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
+ cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
+ if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) {
+ uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid);
+ }
+
+ cmd_ctx->llm->trace_name_offset = trace_name_size;
+ cmd_ctx->llm->data_size = size;
+ cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
+
+ /* Copy trace name to the llm structure. Begining of the payload. */
+ memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
+
+ return buf_size;
+
+error:
+ return ret;
+}
/*
* thread_manage_kconsumerd
static void *thread_manage_kconsumerd(void *data)
{
int sock, ret;
+ enum lttcomm_return_code code;
DBG("[thread] Manage kconsumerd started");
goto error;
}
- while (1) {
- //ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
- if (ret <= 0) {
- /* TODO: Consumerd died? */
- continue;
+ /* Getting status code from kconsumerd */
+ ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
+ if (ret <= 0) {
+ goto error;
+ }
+
+ if (code == KCONSUMERD_COMMAND_SOCK_READY) {
+ kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
+ if (kconsumerd_cmd_sock < 0) {
+ sem_post(&kconsumerd_sem);
+ perror("kconsumerd connect");
+ goto error;
}
+ /* Signal condition to tell that the kconsumerd is ready */
+ sem_post(&kconsumerd_sem);
+ DBG("Kconsumerd command socket ready");
+ } else {
+ DBG("Kconsumerd error when waiting for SOCK_READY : %s",
+ lttcomm_get_readable_code(-code));
+ goto error;
}
+ /* Wait for any kconsumerd error */
+ ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
+ if (ret <= 0) {
+ ERR("Kconsumerd closed the command socket");
+ goto error;
+ }
+
+ ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
+
error:
+ kconsumerd_pid = 0;
+ DBG("Kconsumerd thread dying");
return NULL;
}
notify_apps(default_global_apps_pipe);
while (1) {
+ DBG("Accepting application registration");
/* Blocking call, waiting for transmission */
sock = lttcomm_accept_unix_sock(apps_sock);
if (sock < 0) {
}
/*
- * thread_manage_clients
+ * spawn_kconsumerd_thread
*
- * This thread manage all clients request using the unix
- * client socket for communication.
+ * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
+ * exec or it will fails.
*/
-static void *thread_manage_clients(void *data)
+static int spawn_kconsumerd_thread(void)
{
- int sock, ret;
- struct lttcomm_session_msg lsm;
+ int ret;
- DBG("[thread] Manage client started");
+ /* Setup semaphore */
+ sem_init(&kconsumerd_sem, 0, 0);
- ret = lttcomm_listen_unix_sock(client_sock);
- if (ret < 0) {
+ ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
+ if (ret != 0) {
+ perror("pthread_create kconsumerd");
goto error;
}
- /* Notify parent pid that we are ready
- * to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGCHLD);
- }
-
- while (1) {
- /* Blocking call, waiting for transmission */
- sock = lttcomm_accept_unix_sock(client_sock);
- if (sock < 0) {
- goto error;
- }
-
- /*
- * Data is received from the lttng client. The struct
- * lttcomm_session_msg (lsm) contains the command and data
- * request of the client.
- */
- ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
- if (ret <= 0) {
- continue;
- }
+ /* Wait for the kconsumerd thread to be ready */
+ sem_wait(&kconsumerd_sem);
- /* This function dispatch the work to the LTTng or UST libs
- * and then sends back the response to the client. This is needed
- * because there might be more then one lttcomm_lttng_header to
- * send out so process_client_msg do both jobs.
- */
- ret = process_client_msg(sock, &lsm);
- if (ret < 0) {
- /* Error detected but still accept command */
- continue;
- }
+ if (kconsumerd_pid == 0) {
+ ERR("Kconsumerd did not start");
+ goto error;
}
+ return 0;
+
error:
- return NULL;
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ return ret;
}
/*
- * send_unix_sock
+ * spawn_kconsumerd
*
- * Send data on a unix socket using the liblttsessiondcomm API.
+ * Fork and exec a kernel consumer daemon (kconsumerd).
*
- * Return lttcomm error code.
+ * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
+ * file descriptor using the libkernelctl or kernel-ctl functions. So, a
+ * kernel consumer MUST only be spawned before creating a kernel session.
+ *
+ * Return pid if successful else -1.
*/
-static int send_unix_sock(int sock, void *buf, size_t len)
+static pid_t spawn_kconsumerd(void)
{
- /* Check valid length */
- if (len <= 0) {
- return -1;
+ int ret;
+ pid_t pid;
+
+ DBG("Spawning kconsumerd");
+
+ pid = fork();
+ if (pid == 0) {
+ /*
+ * Exec kconsumerd.
+ */
+ execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
+ if (errno != 0) {
+ perror("kernel start consumer exec");
+ }
+ exit(EXIT_FAILURE);
+ } else if (pid > 0) {
+ ret = pid;
+ goto error;
+ } else {
+ perror("kernel start consumer fork");
+ ret = -errno;
+ goto error;
}
- return lttcomm_send_unix_sock(sock, buf, len);
+error:
+ return ret;
}
/*
- * ust_connect_app
+ * start_kconsumerd
*
- * Return a socket connected to the libust communication socket
- * of the application identified by the pid.
- *
- * If the pid is not found in the traceable list,
- * return -1 to indicate error.
+ * Spawn the kconsumerd daemon and session daemon thread.
*/
-static int ust_connect_app(pid_t pid)
+static int start_kconsumerd(void)
{
- int sock;
- struct ltt_traceable_app *lta;
+ int ret;
- DBG("Connect to application pid %d", pid);
+ pthread_mutex_lock(&kconsumerd_pid_mutex);
+ if (kconsumerd_pid != 0) {
+ goto end;
+ }
- lta = find_app_by_pid(pid);
- if (lta == NULL) {
- /* App not found */
- DBG("Application pid %d not found", pid);
- return -1;
+ ret = spawn_kconsumerd();
+ if (ret < 0) {
+ ERR("Spawning kconsumerd failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ goto error;
}
- sock = ustctl_connect_pid(lta->pid);
- if (sock < 0) {
- ERR("Fail connecting to the PID %d\n", pid);
+ /* Setting up the global kconsumerd_pid */
+ kconsumerd_pid = ret;
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+
+ DBG("Kconsumerd pid %d", ret);
+
+ DBG("Spawning kconsumerd thread");
+ ret = spawn_kconsumerd_thread();
+ if (ret < 0) {
+ ERR("Fatal error spawning kconsumerd thread");
+ goto error;
}
- return sock;
+end:
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ return 0;
+
+error:
+ return ret;
}
/*
- * notify_apps
+ * send_kconsumerd_fds
*
- * Notify apps by writing 42 to a named pipe using name.
- * Every applications waiting for a ltt-sessiond will be notified
- * and re-register automatically to the session daemon.
- *
- * Return open or write error value.
+ * Send all stream fds of the kernel session to the consumer.
*/
-static int notify_apps(const char *name)
+static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
{
- int fd;
- int ret = -1;
+ int ret;
+ size_t nb_fd;
+ struct ltt_kernel_stream *stream;
+ struct ltt_kernel_channel *chan;
+ struct lttcomm_kconsumerd_header lkh;
+ struct lttcomm_kconsumerd_msg lkm;
- DBG("Notify the global application pipe");
+ nb_fd = session->stream_count_global;
- /* Try opening the global pipe */
- fd = open(name, O_WRONLY);
- if (fd < 0) {
+ /* Setup header */
+ lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
+ lkh.cmd_type = ADD_STREAM;
+
+ DBG("Sending kconsumerd header");
+
+ ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
+ if (ret < 0) {
+ perror("send kconsumerd header");
goto error;
}
- /* Notify by writing on the pipe */
- ret = write(fd, "42", 2);
+ DBG("Sending metadata stream fd");
+
+ /* Send metadata stream fd first */
+ lkm.fd = session->metadata_stream_fd;
+ lkm.state = ACTIVE_FD;
+ lkm.max_sb_size = session->metadata->conf->subbuf_size;
+ strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
+
+ ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
if (ret < 0) {
- perror("write");
+ perror("send kconsumerd fd");
+ goto error;
}
+ cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+ cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
+ lkm.fd = stream->fd;
+ lkm.state = stream->state;
+ lkm.max_sb_size = chan->channel->subbuf_size;
+ strncpy(lkm.path_name, stream->pathname, PATH_MAX);
+
+ DBG("Sending fd %d to kconsumerd", lkm.fd);
+
+ ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
+ if (ret < 0) {
+ perror("send kconsumerd fd");
+ goto error;
+ }
+ }
+ }
+
+ DBG("Kconsumerd fds sent");
+
+ return 0;
+
error:
return ret;
}
/*
- * copy_common_data
+ * create_trace_dir
*
- * Copy common data between lttcomm_lttng_header and lttcomm_session_msg
+ * Create the trace output directory.
*/
-static void copy_common_data(struct lttcomm_lttng_header *llh, struct lttcomm_session_msg *lsm)
+static int create_trace_dir(struct ltt_kernel_session *session)
{
- llh->cmd_type = lsm->cmd_type;
- llh->pid = lsm->pid;
+ int ret;
+ struct ltt_kernel_channel *chan;
+
+ /* Create all channel directories */
+ cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+ DBG("Creating trace directory at %s", chan->pathname);
+ ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
+ if (ret < 0) {
+ perror("mkdir trace path");
+ ret = -errno;
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ return ret;
+}
- /* Manage uuid */
- if (!uuid_is_null(lsm->session_id)) {
- uuid_copy(llh->session_id, lsm->session_id);
+/*
+ * init_kernel_tracer
+ *
+ * Setup necessary data for kernel tracer action.
+ */
+static void init_kernel_tracer(void)
+{
+ /* Set the global kernel tracer fd */
+ kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
+ if (kernel_tracer_fd < 0) {
+ WARN("No kernel tracer available");
+ kernel_tracer_fd = 0;
}
- strncpy(llh->trace_name, lsm->trace_name, strlen(llh->trace_name));
- llh->trace_name[strlen(llh->trace_name) - 1] = '\0';
+ DBG("Kernel tracer fd %d", kernel_tracer_fd);
}
/*
- * setup_data_buffer
+ * process_client_msg
*
- * Setup the outgoing data buffer for the response
- * data allocating the right amount of memory.
+ * Process the command requested by the lttng client within the command
+ * context structure. This function make sure that the return structure (llm)
+ * is set and ready for transmission before returning.
*
- * Return total size of the buffer pointed by buf.
+ * Return any error encountered or 0 for success.
*/
-static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_header *llh)
+static int process_client_msg(struct command_ctx *cmd_ctx)
{
- int ret = 0;
- size_t buf_size;
+ int ret;
- buf_size = sizeof(struct lttcomm_lttng_header) + s_data;
- *buf = malloc(buf_size);
- if (*buf == NULL) {
- perror("malloc");
- ret = -1;
- goto error;
+ DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
+
+ /* Check command that needs a session */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_CREATE_SESSION:
+ case LTTNG_LIST_SESSIONS:
+ case KERNEL_LIST_EVENTS:
+ case UST_LIST_APPS:
+ break;
+ default:
+ cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid);
+ if (cmd_ctx->session == NULL) {
+ ret = LTTCOMM_SELECT_SESS;
+ goto error;
+ }
+ break;
}
- /* Setup lttcomm_lttng_header data and copy
- * it to the newly allocated buffer.
- */
- llh->payload_size = s_data;
- memcpy(*buf, llh, sizeof(struct lttcomm_lttng_header));
+ /* Check command for kernel tracing */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case KERNEL_CREATE_SESSION:
+ case KERNEL_CREATE_CHANNEL:
+ case KERNEL_CREATE_STREAM:
+ case KERNEL_DISABLE_EVENT:
+ case KERNEL_ENABLE_EVENT:
+ case KERNEL_LIST_EVENTS:
+ case KERNEL_OPEN_METADATA:
+ case KERNEL_START_TRACE:
+ case KERNEL_STOP_TRACE:
+ /* Kernel tracer check */
+ if (kernel_tracer_fd == 0) {
+ init_kernel_tracer();
+ if (kernel_tracer_fd == 0) {
+ ret = LTTCOMM_KERN_NA;
+ goto error;
+ }
+ }
+ break;
+ }
+
+ /* Connect to ust apps if available pid */
+ if (cmd_ctx->lsm->pid > 0) {
+ /* Connect to app using ustctl API */
+ cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
+ if (cmd_ctx->ust_sock < 0) {
+ ret = LTTCOMM_NO_TRACEABLE;
+ goto error;
+ }
+ }
+
+ /* Process by command type */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case KERNEL_CREATE_SESSION:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = start_kconsumerd();
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG("Creating kernel session");
+
+ ret = kernel_create_session(cmd_ctx->session, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_CREATE_CHANNEL:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Creating kernel channel");
+
+ ret = kernel_create_channel(cmd_ctx->session->kernel_session);
+
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_ENABLE_EVENT:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
+
+ ret = kernel_enable_event(cmd_ctx->session->kernel_session, cmd_ctx->lsm->u.event.event_name);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_ENABLE_ALL_EVENT:
+ {
+ int pos, size;
+ char *event_list, *event, *ptr;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Enabling all kernel event");
+
+ size = kernel_list_events(kernel_tracer_fd, &event_list);
+ if (size < 0) {
+ ret = LTTCOMM_KERN_LIST_FAIL;
+ goto error;
+ }
+
+ ptr = event_list;
+ while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
+ /* Enable each single event */
+ ret = kernel_enable_event(cmd_ctx->session->kernel_session, event);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+ /* Move pointer to the next line */
+ ptr += pos + 1;
+ free(event);
+ }
+
+ free(event_list);
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_LIST_EVENTS:
+ {
+ char *event_list;
+ ssize_t size;
+
+ size = kernel_list_events(kernel_tracer_fd, &event_list);
+ if (size < 0) {
+ ret = LTTCOMM_KERN_LIST_FAIL;
+ goto error;
+ }
+
+ /*
+ * Setup lttng message with payload size set to the event list size in
+ * bytes and then copy list into the llm payload.
+ */
+ ret = setup_lttng_msg(cmd_ctx, size);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Copy event list into message payload */
+ memcpy(cmd_ctx->llm->payload, event_list, size);
+
+ free(event_list);
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_OPEN_METADATA:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Open kernel metadata");
+
+ ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_CREATE_STREAM:
+ {
+ struct ltt_kernel_channel *chan;
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Creating kernel stream");
+
+ ret = kernel_create_metadata_stream(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel create metadata stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
- return buf_size;
+ /* For each channel */
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ ret = kernel_create_channel_stream(chan);
+ if (ret < 0) {
+ ERR("Kernel create channel stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ /* Update the stream global counter */
+ cmd_ctx->session->kernel_session->stream_count_global += ret;
+ }
-error:
- return ret;
-}
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_START_TRACE:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
-/*
- * process_client_msg
- *
- * This takes the lttcomm_session_msg struct and process the command requested
- * by the client. It then creates response(s) and send it back to the
- * given socket (sock).
- *
- * Return any error encountered or 0 for success.
- */
-static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
-{
- int ust_sock, ret, buf_size;
- size_t header_size;
- char *send_buf = NULL;
- struct lttcomm_lttng_header llh;
+ DBG("Start kernel tracing");
- DBG("Processing client message");
+ ret = create_trace_dir(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_KERN_DIR_EXIST;
+ } else {
+ ret = LTTCOMM_KERN_DIR_FAIL;
+ goto error;
+ }
+ }
- /* Copy common data to identify the response
- * on the lttng client side.
- */
- copy_common_data(&llh, lsm);
+ ret = kernel_start_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel start session failed");
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
- /* Check command that needs a session */
- switch (lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_LIST_SESSIONS:
- case UST_LIST_APPS:
- break;
- default:
- current_session = find_session_by_uuid(lsm->session_id);
- if (current_session == NULL) {
- ret = LTTCOMM_SELECT_SESS;
- goto end;
+ ret = send_kconsumerd_fds(kconsumerd_cmd_sock, cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Send kconsumerd fds failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
}
+
+ ret = LTTCOMM_OK;
break;
}
+ case KERNEL_STOP_TRACE:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- /* Default return code.
- * In our world, everything is OK... right? ;)
- */
- llh.ret_code = LTTCOMM_OK;
+ if (cmd_ctx->session->kernel_session == NULL) {
+ ret = LTTCOMM_KERN_NO_SESSION;
+ goto error;
+ }
- header_size = sizeof(struct lttcomm_lttng_header);
+ DBG("Stop kernel tracing");
- /* Connect to ust apps if available pid */
- if (lsm->pid != 0) {
- /* Connect to app using ustctl API */
- ust_sock = ust_connect_app(lsm->pid);
- if (ust_sock < 0) {
- ret = LTTCOMM_NO_TRACEABLE;
- goto end;
+ ret = kernel_stop_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel stop session failed");
+ ret = LTTCOMM_KERN_STOP_FAIL;
+ goto error;
}
- }
- /* Process by command type */
- switch (lsm->cmd_type) {
+ /* Clean kernel session teardown */
+ teardown_kernel_session(cmd_ctx->session);
+
+ ret = LTTCOMM_OK;
+ break;
+ }
case LTTNG_CREATE_SESSION:
{
- ret = create_session(lsm->session_name, &llh.session_id);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
if (ret < 0) {
if (ret == -1) {
ret = LTTCOMM_EXIST_SESS;
} else {
ret = LTTCOMM_FATAL;
}
- goto end;
- }
-
- buf_size = setup_data_buffer(&send_buf, 0, &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
+ goto error;
}
+ ret = LTTCOMM_OK;
break;
}
case LTTNG_DESTROY_SESSION:
{
- ret = destroy_session(&lsm->session_id);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = destroy_session(&cmd_ctx->lsm->session_uuid);
if (ret < 0) {
ret = LTTCOMM_NO_SESS;
- } else {
- ret = LTTCOMM_OK;
+ goto error;
}
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = LTTCOMM_OK;
+ break;
}
case LTTNG_LIST_TRACES:
{
- unsigned int trace_count = get_trace_count_per_session(current_session);
+ unsigned int trace_count;
+ trace_count = get_trace_count_per_session(cmd_ctx->session);
if (trace_count == 0) {
ret = LTTCOMM_NO_TRACE;
- goto end;
+ goto error;
}
- buf_size = setup_data_buffer(&send_buf,
- sizeof(struct lttng_trace) * trace_count, &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
+ if (ret < 0) {
+ goto setup_error;
}
- get_traces_per_session(current_session, (struct lttng_trace *)(send_buf + header_size));
+ get_traces_per_session(cmd_ctx->session,
+ (struct lttng_trace *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
break;
}
case UST_CREATE_TRACE:
{
- ret = ust_create_trace(ust_sock, lsm->pid);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
- /* If -1 is returned from ust_create_trace, malloc
- * failed so it's pretty much a fatal error.
- */
- ret = LTTCOMM_FATAL;
- goto end;
+ goto setup_error;
}
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = ust_create_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
}
case UST_LIST_APPS:
{
- unsigned int app_count = get_app_count();
- /* Stop right now if no apps */
+ unsigned int app_count;
+
+ app_count = get_app_count();
+ DBG("Traceable application count : %d", app_count);
if (app_count == 0) {
ret = LTTCOMM_NO_APPS;
- goto end;
+ goto error;
}
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- sizeof(pid_t) * app_count, &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
+ ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
+ if (ret < 0) {
+ goto setup_error;
}
- get_app_list_pids((pid_t *)(send_buf + header_size));
+ get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
+ ret = LTTCOMM_OK;
break;
}
case UST_START_TRACE:
{
- ret = ust_start_trace(ust_sock, lsm->pid);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = ust_start_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
}
case UST_STOP_TRACE:
{
- ret = ust_stop_trace(ust_sock, lsm->pid);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = ust_stop_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
}
case LTTNG_LIST_SESSIONS:
{
- unsigned int session_count = get_session_count();
- /* Stop right now if no session */
+ unsigned int session_count;
+
+ session_count = get_session_count();
if (session_count == 0) {
ret = LTTCOMM_NO_SESS;
- goto end;
+ goto error;
}
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- (sizeof(struct lttng_session) * session_count), &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
+ if (ret < 0) {
+ goto setup_error;
}
- get_lttng_session((struct lttng_session *)(send_buf + header_size));
+ get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
+ ret = LTTCOMM_OK;
break;
}
default:
/* Undefined command */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
ret = LTTCOMM_UND;
- goto end;
+ break;
}
- ret = send_unix_sock(sock, send_buf, buf_size);
-
- if (send_buf != NULL) {
- free(send_buf);
- }
+ /* Set return code */
+ cmd_ctx->llm->ret_code = ret;
return ret;
-end:
- DBG("Return code to client %d", ret);
+error:
+ if (cmd_ctx->llm == NULL) {
+ DBG("Missing llm structure. Allocating one.");
+ if (setup_lttng_msg(cmd_ctx, 0) < 0) {
+ goto setup_error;
+ }
+ }
/* Notify client of error */
- llh.ret_code = ret;
- llh.payload_size = 0;
- send_unix_sock(sock, (void*) &llh, sizeof(llh));
+ cmd_ctx->llm->ret_code = ret;
+setup_error:
return ret;
}
+/*
+ * thread_manage_clients
+ *
+ * This thread manage all clients request using the unix
+ * client socket for communication.
+ */
+static void *thread_manage_clients(void *data)
+{
+ int sock, ret;
+ struct command_ctx *cmd_ctx;
+
+ DBG("[thread] Manage client started");
+
+ ret = lttcomm_listen_unix_sock(client_sock);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Notify parent pid that we are ready
+ * to accept command for client side.
+ */
+ if (opt_sig_parent) {
+ kill(ppid, SIGCHLD);
+ }
+
+ while (1) {
+ /* Blocking call, waiting for transmission */
+ DBG("Accepting client command ...");
+ sock = lttcomm_accept_unix_sock(client_sock);
+ if (sock < 0) {
+ goto error;
+ }
+
+ /* Allocate context command to process the client request */
+ cmd_ctx = malloc(sizeof(struct command_ctx));
+
+ /* Allocate data buffer for reception */
+ cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
+ cmd_ctx->llm = NULL;
+ cmd_ctx->session = NULL;
+
+ /*
+ * Data is received from the lttng client. The struct
+ * lttcomm_session_msg (lsm) contains the command and data request of
+ * the client.
+ */
+ DBG("Receiving data from client ...");
+ ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
+ if (ret <= 0) {
+ continue;
+ }
+
+ /*
+ * This function dispatch the work to the kernel or userspace tracer
+ * libs and fill the lttcomm_lttng_msg data structure of all the needed
+ * informations for the client. The command context struct contains
+ * everything this function may needs.
+ */
+ ret = process_client_msg(cmd_ctx);
+ if (ret < 0) {
+ /* TODO: Inform client somehow of the fatal error. At this point,
+ * ret < 0 means that a malloc failed (ENOMEM). */
+ /* Error detected but still accept command */
+ clean_command_ctx(cmd_ctx);
+ continue;
+ }
+
+ DBG("Sending response (size: %d, retcode: %d)",
+ cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
+ ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
+ if (ret < 0) {
+ ERR("Failed to send data back to client");
+ }
+
+ clean_command_ctx(cmd_ctx);
+
+ /* End of transmission */
+ close(sock);
+ }
+
+error:
+ return NULL;
+}
+
+
/*
* usage function on stderr
*/
ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
if (ret < 0) {
- ERR("Unable to create " LTTNG_RUNDIR);
- goto error;
+ if (errno != EEXIST) {
+ ERR("Unable to create " LTTNG_RUNDIR);
+ goto error;
+ } else {
+ ret = 0;
+ }
}
error:
return ret;
}
+/*
+ * sighandler
+ *
+ * Signal handler for the daemon
+ */
+static void sighandler(int sig)
+{
+ switch (sig) {
+ case SIGPIPE:
+ DBG("SIGPIPE catched");
+ return;
+ case SIGINT:
+ DBG("SIGINT catched");
+ cleanup();
+ break;
+ case SIGTERM:
+ DBG("SIGTERM catched");
+ cleanup();
+ break;
+ default:
+ break;
+ }
+
+ exit(EXIT_SUCCESS);
+}
+
/*
* set_signal_handler
*
return ret;
}
-/**
- * sighandler
- *
- * Signal handler for the daemon
- */
-static void sighandler(int sig)
-{
- switch (sig) {
- case SIGPIPE:
- DBG("SIGPIPE catched");
- return;
- case SIGINT:
- DBG("SIGINT catched");
- cleanup();
- break;
- case SIGTERM:
- DBG("SIGTERM catched");
- cleanup();
- break;
- default:
- break;
- }
-
- exit(EXIT_SUCCESS);
-}
-
-/*
- * cleanup
- *
- * Cleanup the daemon on exit
- */
-static void cleanup()
-{
- int ret;
- char *cmd;
-
- DBG("Cleaning up");
-
- /* <fun> */
- MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
- MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
- /* </fun> */
-
- unlink(client_unix_sock_path);
- unlink(apps_unix_sock_path);
- unlink(kconsumerd_err_unix_sock_path);
-
- ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
- if (ret < 0) {
- ERR("asprintf failed. Something is really wrong!");
- }
-
- /* Remove lttng run directory */
- ret = system(cmd);
- if (ret < 0) {
- ERR("Unable to clean " LTTNG_RUNDIR);
- }
-}
-
/*
* main
*/
int main(int argc, char **argv)
{
- int i;
int ret = 0;
void *status;
- pthread_t threads[2];
/* Parse arguments */
progname = argv[0];
if (ret < 0) {
goto error;
}
+
+ /* Setup kernel tracer */
+ init_kernel_tracer();
} else {
if (strlen(apps_unix_sock_path) == 0) {
snprintf(apps_unix_sock_path, PATH_MAX,
}
}
+ DBG("Client socket path %s", client_unix_sock_path);
+ DBG("Application socket path %s", apps_unix_sock_path);
+
/* See if daemon already exist. If any of the two
* socket needed by the daemon are present, this test fails
*/
while (1) {
/* Create thread to manage the client socket */
- ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL);
+ ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
if (ret != 0) {
perror("pthread_create");
goto error;
}
/* Create thread to manage application socket */
- ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL);
+ ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
if (ret != 0) {
perror("pthread_create");
goto error;
}
- for (i = 0; i < 2; i++) {
- ret = pthread_join(threads[i], &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error;
- }
+ ret = pthread_join(client_thread, &status);
+ if (ret != 0) {
+ perror("pthread_join");
+ goto error;
}
}
projects / lttng-tools.git / blobdiff