#include <grp.h>
#include <limits.h>
#include <pthread.h>
+#include <semaphore.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
#include <unistd.h>
#include <urcu/list.h> /* URCU list library (-lurcu) */
-#include <ust/ustctl.h> /* UST control lib (-lust) */
#include <lttng/lttng.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"
+#include "libustctl.h"
+#include "utils.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(struct command_ctx *cmd_ctx);
-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_lttng_msg(struct command_ctx *cmd_ctx, size_t size);
-static int create_lttng_rundir(void);
-static int set_kconsumerd_sockets(void);
-static void cleanup(void);
-static void sighandler(int sig);
-static void clean_command_ctx(struct command_ctx *cmd_ctx);
-
-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 */
/*
- * thread_manage_kconsumerd
+ * teardown_kernel_session
*
- * This thread manage the kconsumerd error sent
- * back to the session daemon.
+ * Complete teardown of a kernel session. This free all data structure
+ * related to a kernel session and update counter.
*/
-static void *thread_manage_kconsumerd(void *data)
+static void teardown_kernel_session(struct ltt_session *session)
{
- int sock, ret;
-
- DBG("[thread] Manage kconsumerd started");
-
- ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
- if (ret < 0) {
- goto error;
- }
-
- sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
- if (sock < 0) {
- goto error;
- }
-
- while (1) {
- //ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
- if (ret <= 0) {
- /* TODO: Consumerd died? */
- continue;
- }
+ 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--;
}
-
-error:
- return NULL;
}
/*
- * thread_manage_apps
+ * cleanup
*
- * This thread manage the application socket communication
+ * Cleanup the daemon on exit
*/
-static void *thread_manage_apps(void *data)
+static void cleanup()
{
- int sock, ret;
-
- /* TODO: Something more elegant is needed but fine for now */
- /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
- * for 32-bit vs 64-bit compat processes. */
- /* replicate in ust with version number */
- struct {
- int reg; /* 1:register, 0:unregister */
- pid_t pid;
- uid_t uid;
- } reg_msg;
-
- DBG("[thread] Manage apps started");
-
- ret = lttcomm_listen_unix_sock(apps_sock);
- if (ret < 0) {
- goto error;
- }
-
- /* Notify all applications to register */
- notify_apps(default_global_apps_pipe);
+ int ret;
+ char *cmd;
+ struct ltt_session *sess;
- while (1) {
- /* Blocking call, waiting for transmission */
- sock = lttcomm_accept_unix_sock(apps_sock);
- if (sock < 0) {
- goto error;
- }
+ DBG("Cleaning up");
- /* Basic recv here to handle the very simple data
- * that the libust send to register (reg_msg).
- */
- ret = recv(sock, ®_msg, sizeof(reg_msg), 0);
- if (ret < 0) {
- perror("recv");
- continue;
- }
+ /* <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> */
- /* Add application to the global traceable list */
- if (reg_msg.reg == 1) {
- /* Registering */
- ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
- if (ret < 0) {
- /* register_traceable_app only return an error with
- * ENOMEM. At this point, we better stop everything.
- */
- goto error;
- }
- } else {
- /* Unregistering */
- unregister_traceable_app(reg_msg.pid);
- }
+ /* Stopping all threads */
+ DBG("Terminating all threads");
+ pthread_cancel(client_thread);
+ pthread_cancel(apps_thread);
+ if (kconsumerd_pid != 0) {
+ pthread_cancel(kconsumerd_thread);
}
-error:
-
- return NULL;
-}
-
-/*
- * 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");
+ DBG("Unlinking all unix socket");
+ unlink(client_unix_sock_path);
+ unlink(apps_unix_sock_path);
+ unlink(kconsumerd_err_unix_sock_path);
- ret = lttcomm_listen_unix_sock(client_sock);
+ DBG("Removing %s directory", LTTNG_RUNDIR);
+ ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
if (ret < 0) {
- goto error;
+ ERR("asprintf failed. Something is really wrong!");
}
- /* Notify parent pid that we are ready
- * to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGCHLD);
+ /* Remove lttng run directory */
+ ret = system(cmd);
+ if (ret < 0) {
+ ERR("Unable to clean " LTTNG_RUNDIR);
}
- 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 to client (size: %d)", cmd_ctx->lttng_msg_size);
- 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);
+ 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)
}
-error:
- return NULL;
+ DBG("Closing kernel fd");
+ close(kernel_tracer_fd);
}
/*
}
}
+/*
+ * send_kconsumerd_fds
+ *
+ * Send all stream fds of the kernel session to the consumer.
+ */
+static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
+{
+ 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;
+
+ nb_fd = session->stream_count_global;
+
+ /* 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;
+ }
+
+ 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->attr.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("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->attr.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;
+}
+
+/*
+ * create_trace_dir
+ *
+ * Create the trace output directory.
+ */
+static int create_trace_dir(struct ltt_kernel_session *session)
+{
+ 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_recursive(chan->pathname, S_IRWXU | S_IRWXG );
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ERR("Trace directory creation error");
+ goto error;
+ }
+ }
+ }
+
+ return 0;
+
+error:
+ return ret;
+}
+
/*
* ust_connect_app
*
sock = ustctl_connect_pid(lta->pid);
if (sock < 0) {
- ERR("Fail connecting to the PID %d\n", pid);
+ ERR("Fail connecting to the PID %d", pid);
}
return sock;
*/
static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
{
- int ret, buf_size, trace_name_size;
+ int ret, buf_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;
+ buf_size = size;
cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
if (cmd_ctx->llm == NULL) {
/* 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->data_size = size;
+ cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
+
+ return buf_size;
+
+error:
+ return ret;
+}
+
+/*
+ * thread_manage_kconsumerd
+ *
+ * This thread manage the kconsumerd error sent
+ * back to the session daemon.
+ */
+static void *thread_manage_kconsumerd(void *data)
+{
+ int sock, ret;
+ enum lttcomm_return_code code;
+
+ DBG("[thread] Manage kconsumerd started");
+
+ ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
+ if (ret < 0) {
+ goto error;
+ }
+
+ sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
+ if (sock < 0) {
+ goto error;
+ }
+
+ /* 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;
+}
+
+/*
+ * thread_manage_apps
+ *
+ * This thread manage the application socket communication
+ */
+static void *thread_manage_apps(void *data)
+{
+ int sock, ret;
+
+ /* TODO: Something more elegant is needed but fine for now */
+ /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
+ * for 32-bit vs 64-bit compat processes. */
+ /* replicate in ust with version number */
+ struct {
+ int reg; /* 1:register, 0:unregister */
+ pid_t pid;
+ uid_t uid;
+ } reg_msg;
+
+ DBG("[thread] Manage apps started");
+
+ ret = lttcomm_listen_unix_sock(apps_sock);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Notify all applications to register */
+ 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) {
+ goto error;
+ }
+
+ /* Basic recv here to handle the very simple data
+ * that the libust send to register (reg_msg).
+ */
+ ret = recv(sock, ®_msg, sizeof(reg_msg), 0);
+ if (ret < 0) {
+ perror("recv");
+ continue;
+ }
+
+ /* Add application to the global traceable list */
+ if (reg_msg.reg == 1) {
+ /* Registering */
+ ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
+ if (ret < 0) {
+ /* register_traceable_app only return an error with
+ * ENOMEM. At this point, we better stop everything.
+ */
+ goto error;
+ }
+ } else {
+ /* Unregistering */
+ unregister_traceable_app(reg_msg.pid);
+ }
+ }
+
+error:
+
+ return NULL;
+}
+
+/*
+ * spawn_kconsumerd_thread
+ *
+ * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
+ * exec or it will fails.
+ */
+static int spawn_kconsumerd_thread(void)
+{
+ int ret;
+
+ /* Setup semaphore */
+ sem_init(&kconsumerd_sem, 0, 0);
+
+ ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
+ if (ret != 0) {
+ perror("pthread_create kconsumerd");
+ goto error;
+ }
+
+ /* Wait for the kconsumerd thread to be ready */
+ sem_wait(&kconsumerd_sem);
+
+ if (kconsumerd_pid == 0) {
+ ERR("Kconsumerd did not start");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ return ret;
+}
+
+/*
+ * spawn_kconsumerd
+ *
+ * Fork and exec a kernel consumer daemon (kconsumerd).
+ *
+ * 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 pid_t spawn_kconsumerd(void)
+{
+ 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;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * start_kconsumerd
+ *
+ * Spawn the kconsumerd daemon and session daemon thread.
+ */
+static int start_kconsumerd(void)
+{
+ int ret;
+
+ pthread_mutex_lock(&kconsumerd_pid_mutex);
+ if (kconsumerd_pid != 0) {
+ goto end;
+ }
+
+ ret = spawn_kconsumerd();
+ if (ret < 0) {
+ ERR("Spawning kconsumerd failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ goto error;
+ }
+
+ /* 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;
+ }
+
+end:
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * 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;
+ }
+
+ DBG("Kernel tracer fd %d", kernel_tracer_fd);
+}
+
+/*
+ * start_kernel_trace
+ *
+ * Start tracing by creating trace directory and sending FDs to the kernel
+ * consumer.
+ */
+static int start_kernel_trace(struct ltt_kernel_session *session)
+{
+ int ret;
+
+ /* Create trace directory */
+ ret = create_trace_dir(session);
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_KERN_DIR_EXIST;
+ } else {
+ ret = LTTCOMM_KERN_DIR_FAIL;
+ goto error;
+ }
+ }
+
+ if (session->kconsumer_fds_sent == 0) {
+ ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
+ if (ret < 0) {
+ ERR("Send kconsumerd fds failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
+ }
+
+ session->kconsumer_fds_sent = 1;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * init_default_channel
+ *
+ * Allocate a channel structure and fill it.
+ */
+static struct lttng_channel *init_default_channel(void)
+{
+ struct lttng_channel *chan;
+
+ chan = malloc(sizeof(struct lttng_channel));
+ if (chan == NULL) {
+ perror("init channel malloc");
+ goto error;
+ }
+
+ if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
+ perror("snprintf defautl channel name");
+ return NULL;
+ }
+
+ chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
+ chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
+ chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+ chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+
+error:
+ return chan;
+}
+
+/*
+ * create_kernel_session
+ *
+ * Create a kernel tracer session then create the default channel.
+ */
+static int create_kernel_session(struct ltt_session *session)
+{
+ int ret;
+ struct lttng_channel *chan;
+
+ DBG("Creating kernel session");
+
+ ret = kernel_create_session(session, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ chan = init_default_channel();
+ if (chan == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
+
+ ret = kernel_create_channel(session->kernel_session, chan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * process_client_msg
+ *
+ * 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 any error encountered or 0 for success.
+ */
+static int process_client_msg(struct command_ctx *cmd_ctx)
+{
+ int ret;
+
+ DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
+
+ /* Listing commands don't need a session */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_CREATE_SESSION:
+ case LTTNG_LIST_SESSIONS:
+ case LTTNG_LIST_EVENTS:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ case LTTNG_LIST_TRACEABLE_APPS:
+ break;
+ default:
+ DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
+ cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
+ if (cmd_ctx->session == NULL) {
+ /* If session name not found */
+ if (cmd_ctx->lsm->session_name != NULL) {
+ ret = LTTCOMM_SESS_NOT_FOUND;
+ } else { /* If no session name specified */
+ ret = LTTCOMM_SELECT_SESS;
+ }
+ goto error;
+ }
+ break;
+ }
+
+ /*
+ * Check kernel command for kernel session.
+ */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_KERNEL_ADD_CONTEXT:
+ case LTTNG_KERNEL_CREATE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_EVENT:
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ case LTTNG_KERNEL_ENABLE_EVENT:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ /* Kernel tracer check */
+ if (kernel_tracer_fd == 0) {
+ init_kernel_tracer();
+ if (kernel_tracer_fd == 0) {
+ ret = LTTCOMM_KERN_NA;
+ goto error;
+ }
+ }
+
+ /* Need a session for kernel command */
+ if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
+ cmd_ctx->session->kernel_session == NULL) {
+
+ ret = create_kernel_session(cmd_ctx->session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ /* Start the kernel consumer daemon */
+ if (kconsumerd_pid == 0) {
+ ret = start_kconsumerd();
+ if (ret < 0) {
+ goto error;
+ }
+ }
+ }
+ }
+
+ /* 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 LTTNG_KERNEL_ADD_CONTEXT:
+ {
+ int found = 0, no_event = 0;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *event;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Check if event name is given */
+ if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
+ no_event = 1;
+ }
+
+ if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
+ /* Go over all channels */
+ DBG("Adding context to all channels");
+ cds_list_for_each_entry(chan,
+ &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ continue;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ found = 1;
+ break;
+ }
+ }
+ }
+ } else {
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ }
+ }
+ }
+
+ if (!found && !no_event) {
+ ret = LTTCOMM_NO_EVENT;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_CREATE_CHANNEL:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Kernel tracer */
+ DBG("Creating kernel channel");
+
+ ret = kernel_create_channel(cmd_ctx->session->kernel_session,
+ &cmd_ctx->lsm->u.channel.chan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ } else if (chan->enabled == 1) {
+ ret = kernel_disable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
+ }
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
+ if (ev != NULL) {
+ DBG("Disabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Disabling all enabled kernel events");
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Disabling kernel event %s for channel %s.",
+ ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ /* Quiescent wait after event disable */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ } else if (chan->enabled == 0) {
+ ret = kernel_enable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
+ }
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
+ if (ev == NULL) {
+ DBG("Creating kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
+ } else {
+ DBG("Enabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ }
+
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
+ {
+ int pos, size;
+ char *event_list, *event, *ptr;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+ struct lttng_event ev_attr;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Enabling all kernel event");
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Enabling kernel event %s for channel %s.",
+ ev->event->name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ 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) {
+ ev = get_kernel_event_by_name(event, chan);
+ if (ev == NULL) {
+ strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
+ /* Default event type for enable all */
+ ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
+ /* Enable each single tracepoint event */
+ ret = kernel_create_event(&ev_attr, chan);
+ if (ret < 0) {
+ /* Ignore error here and continue */
+ }
+ }
+
+ /* Move pointer to the next line */
+ ptr += pos + 1;
+ free(event);
+ }
+
+ free(event_list);
+
+ /* Quiescent wait after event enable */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_LIST_EVENTS:
+ {
+ char *event_list;
+ ssize_t size = 0;
+
+ DBG("Listing kernel events");
+
+ 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 LTTNG_START_TRACE:
+ {
+ struct ltt_kernel_channel *chan;
- 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;
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- /* Copy trace name to the llm structure. Begining of the payload. */
- memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
+ /* Kernel tracing */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ if (cmd_ctx->session->kernel_session->metadata == NULL) {
+ DBG("Open kernel metadata");
+ ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+ }
- return buf_size;
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ DBG("Opening kernel metadata stream");
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel create metadata stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ }
+ }
-error:
- return ret;
-}
+ /* For each channel */
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (chan->stream_count == 0) {
+ ret = kernel_open_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;
+ }
+ }
-/*
- * process_client_msg
- *
- * 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 any error encountered or 0 for success.
- */
-static int process_client_msg(struct command_ctx *cmd_ctx)
-{
- int ret;
+ DBG("Start kernel tracing");
+ ret = kernel_start_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel start session failed");
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
- DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
+ ret = start_kernel_trace(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
- /* Check command that needs a session */
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_LIST_SESSIONS:
- 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;
+ /* Quiescent wait after starting trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
}
+
+ /* TODO: Start all UST traces */
+
+ ret = LTTCOMM_OK;
break;
}
+ case LTTNG_STOP_TRACE:
+ {
+ struct ltt_kernel_channel *chan;
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- /* 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;
+ /* Kernel tracer */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ DBG("Stop kernel tracing");
+
+ ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
+ if (ret < 0) {
+ ERR("Kernel metadata flush failed");
+ }
+
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ ret = kernel_flush_buffer(chan);
+ if (ret < 0) {
+ ERR("Kernel flush buffer error");
+ }
+ }
+
+ ret = kernel_stop_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel stop session failed");
+ ret = LTTCOMM_KERN_STOP_FAIL;
+ goto error;
+ }
+
+ /* Quiescent wait after stopping trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
}
- }
- /* Process by command type */
- switch (cmd_ctx->lsm->cmd_type) {
+ /* TODO : User-space tracer */
+
+ ret = LTTCOMM_OK;
+ break;
+ }
case LTTNG_CREATE_SESSION:
{
/* Setup lttng message with no payload */
goto setup_error;
}
- ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
+ ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path);
if (ret < 0) {
- if (ret == -1) {
+ if (ret == -EEXIST) {
ret = LTTCOMM_EXIST_SESS;
} else {
ret = LTTCOMM_FATAL;
goto setup_error;
}
- ret = destroy_session(&cmd_ctx->lsm->session_uuid);
+ /* Clean kernel session teardown */
+ teardown_kernel_session(cmd_ctx->session);
+
+ ret = destroy_session(cmd_ctx->lsm->session_name);
if (ret < 0) {
- ret = LTTCOMM_NO_SESS;
+ ret = LTTCOMM_FATAL;
goto error;
}
ret = LTTCOMM_OK;
break;
}
+ /*
case LTTNG_LIST_TRACES:
{
unsigned int trace_count;
ret = LTTCOMM_OK;
break;
}
+ */
+ /*
case UST_CREATE_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
ret = ust_create_trace(cmd_ctx);
if (ret < 0) {
- goto setup_error;
+ goto error;
}
break;
}
- case UST_LIST_APPS:
+ */
+ case LTTNG_LIST_TRACEABLE_APPS:
{
unsigned int app_count;
ret = LTTCOMM_OK;
break;
}
+ /*
case UST_START_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
case UST_STOP_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
break;
}
+ */
case LTTNG_LIST_SESSIONS:
{
unsigned int session_count;
session_count = get_session_count();
if (session_count == 0) {
- ret = LTTCOMM_NO_SESS;
+ ret = LTTCOMM_NO_SESSION;
goto error;
}
return ret;
error:
- DBG("Return code to client %d", ret);
-
if (cmd_ctx->llm == NULL) {
DBG("Missing llm structure. Allocating one.");
- ret = setup_lttng_msg(cmd_ctx, 0);
- if (ret < 0) {
+ if (setup_lttng_msg(cmd_ctx, 0) < 0) {
goto 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;
+ }
+
+ // TODO: Validate cmd_ctx including sanity check for security purpose.
+
+ /*
+ * 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:
ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
if (ret < 0) {
- ERR("Failed to create " KCONSUMERD_PATH);
- goto error;
+ if (errno != EEXIST) {
+ ERR("Failed to create " KCONSUMERD_PATH);
+ goto error;
+ }
+ ret = 0;
}
/* Create the kconsumerd error unix socket */
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
+ * set_ulimit
*
- * Cleanup the daemon on exit
+ * Set open files limit to unlimited. This daemon can open a large number of
+ * file descriptors in order to consumer multiple kernel traces.
*/
-static void cleanup()
+static void set_ulimit(void)
{
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);
+ struct rlimit lim;
- ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
- if (ret < 0) {
- ERR("asprintf failed. Something is really wrong!");
- }
+ lim.rlim_cur = 65535;
+ lim.rlim_max = 65535;
- /* Remove lttng run directory */
- ret = system(cmd);
+ ret = setrlimit(RLIMIT_NOFILE, &lim);
if (ret < 0) {
- ERR("Unable to clean " LTTNG_RUNDIR);
+ perror("failed to set open files limit");
}
}
*/
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();
+
+ /* Set ulimit for open files */
+ set_ulimit();
} else {
if (strlen(apps_unix_sock_path) == 0) {
snprintf(apps_unix_sock_path, PATH_MAX,
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;
}
}