#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/liblttngctl.h>
+#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"
+
+/*
+ * TODO:
+ * teardown: signal SIGTERM handler -> write into pipe. Threads waits
+ * with epoll on pipe and on other pipes/sockets for commands. Main
+ * simply waits on pthread join.
+ */
/* 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 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_socket_perms(void);
-static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_msg *llm);
-static void cleanup(void);
-static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm);
-static void sighandler(int sig);
-
-static void *thread_manage_clients(void *data);
-static void *thread_manage_apps(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 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 */
-static int client_socket;
-static int apps_socket;
+/* 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;
-static struct ltt_session *current_session;
+/* 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_apps
+ * teardown_kernel_session
*
- * This thread manage the application socket communication
+ * Complete teardown of a kernel session. This free all data structure
+ * related to a kernel session and update counter.
*/
-static void *thread_manage_apps(void *data)
+static void teardown_kernel_session(struct ltt_session *session)
{
- int sock, ret;
+ 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--;
+ }
+}
- /* TODO: Something more elegant is needed but fine for now */
- struct {
- int reg; /* 1:register, 0:unregister */
- pid_t pid;
- uid_t uid;
- } reg_msg;
+/*
+ * cleanup
+ *
+ * Cleanup the daemon on exit
+ */
+static void cleanup()
+{
+ int ret;
+ char *cmd;
+ struct ltt_session *sess;
- DBG("[thread] Manage apps started");
+ DBG("Cleaning up");
- /* Notify all applications to register */
- notify_apps(default_global_apps_pipe);
+ /* <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);
- ret = lttcomm_listen_unix_sock(apps_socket);
+ 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!");
}
- while (1) {
- /* Blocking call, waiting for transmission */
- sock = lttcomm_accept_unix_sock(apps_socket);
- if (sock < 0) {
- goto error;
- }
+ /* Remove lttng run directory */
+ ret = system(cmd);
+ if (ret < 0) {
+ ERR("Unable to clean " LTTNG_RUNDIR);
+ }
- /* 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;
- }
+ 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)
+ }
- /* 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);
- }
+ DBG("Closing kernel fd");
+ 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;
}
-error:
+ return lttcomm_send_unix_sock(sock, buf, len);
+}
- return NULL;
+/*
+ * 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;
+ }
}
/*
- * thread_manage_clients
+ * send_kconsumerd_fds
*
- * This thread manage all clients request using the unix
- * client socket for communication.
+ * Send all stream fds of the kernel session to the consumer.
*/
-static void *thread_manage_clients(void *data)
+static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
{
- int sock, ret;
- struct lttcomm_session_msg lsm;
+ 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("[thread] Manage client started");
+ nb_fd = session->stream_count_global;
+
+ /* Setup header */
+ lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
+ lkh.cmd_type = ADD_STREAM;
- ret = lttcomm_listen_unix_sock(client_socket);
+ 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 parent pid that we are ready
- * to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGCHLD);
+ 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;
}
- while (1) {
- /* Blocking call, waiting for transmission */
- sock = lttcomm_accept_unix_sock(client_socket);
- if (sock < 0) {
- 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);
- /*
- * 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;
- }
+ DBG("Sending fd %d to kconsumerd", lkm.fd);
- /* 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_msg 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;
+ 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 NULL;
+ return ret;
}
/*
- * send_unix_sock
+ * create_trace_dir
*
- * Send data on a unix socket using the liblttsessiondcomm API.
- *
- * Return lttcomm error code.
+ * Create the trace output directory.
*/
-static int send_unix_sock(int sock, void *buf, size_t len)
+static int create_trace_dir(struct ltt_kernel_session *session)
{
- /* Check valid length */
- if (len <= 0) {
- return -1;
+ 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);
+ // TODO: recursive create dir
+ ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ perror("mkdir trace path");
+ ret = -errno;
+ goto error;
+ }
+ }
}
- return lttcomm_send_unix_sock(sock, buf, len);
+ return 0;
+
+error:
+ return ret;
}
/*
- * connect_app
+ * 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 connect_app(pid_t pid)
+static int ust_connect_app(pid_t pid)
{
int sock;
struct ltt_traceable_app *lta;
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);
+ ERR("Fail connecting to the PID %d", pid);
}
return sock;
}
/*
- * ust_create_trace
+ * setup_lttng_msg
*
- * Create an userspace trace using pid.
- * This trace is then appended to the current session
- * ust trace list.
+ * 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 ust_create_trace(pid_t pid)
+static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
{
- int sock, ret;
- struct ltt_ust_trace *trace;
+ int ret, buf_size;
- DBG("Creating trace for pid %d", pid);
+ buf_size = size;
- trace = malloc(sizeof(struct ltt_ust_trace));
- if (trace == NULL) {
+ cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
+ if (cmd_ctx->llm == NULL) {
perror("malloc");
- ret = -1;
+ ret = -ENOMEM;
goto error;
}
- /* Init */
- trace->pid = pid;
- trace->shmid = 0;
+ /* Copy common data */
+ cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
+ cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
+
+ 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;
+ }
- /* Connect to app using ustctl API */
- sock = connect_app(pid);
+ sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
if (sock < 0) {
- ret = LTTCOMM_NO_TRACEABLE;
goto error;
}
- ret = ustctl_create_trace(sock, "auto");
- if (ret < 0) {
- ret = LTTCOMM_CREATE_FAIL;
+ /* 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;
}
- /* Check if current session is valid */
- if (current_session) {
- cds_list_add(&trace->list, ¤t_session->ust_traces);
+ /* 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:
- return ret;
+ kconsumerd_pid = 0;
+ DBG("Kconsumerd thread dying");
+ return NULL;
}
/*
- * ust_start_trace
+ * thread_manage_apps
*
- * Start a trace. This trace, identified by the pid, must be
- * in the current session ust_traces list.
+ * This thread manage the application socket communication
*/
-static int ust_start_trace(pid_t pid)
+static void *thread_manage_apps(void *data)
{
int sock, ret;
- struct ltt_ust_trace *trace;
- DBG("Starting trace for pid %d", pid);
+ /* 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");
- trace = find_session_ust_trace_by_pid(current_session, pid);
- if (trace == NULL) {
- ret = LTTCOMM_NO_TRACE;
+ ret = lttcomm_listen_unix_sock(apps_sock);
+ if (ret < 0) {
goto error;
}
- /* Connect to app using ustctl API */
- sock = connect_app(pid);
- if (sock < 0) {
- ret = LTTCOMM_NO_TRACEABLE;
+ /* 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;
}
- ret = ustctl_start_trace(sock, "auto");
- if (ret < 0) {
- ret = LTTCOMM_START_FAIL;
+ /* Wait for the kconsumerd thread to be ready */
+ sem_wait(&kconsumerd_sem);
+
+ if (kconsumerd_pid == 0) {
+ ERR("Kconsumerd did not start");
goto error;
}
-error:
- return ret;
-}
+ 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_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;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* 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;
+ }
+ }
+
+ 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;
+ }
+ }
+ }
+
+ /* 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;
+ }
+ }
+
+ 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;
+ }
+
+ ret = start_kernel_trace(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
+ 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;
+ }
+
+ /* 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);
+ }
+
+ /* TODO : User-space tracer */
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_CREATE_SESSION:
+ {
+ /* 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->lsm->path);
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_EXIST_SESS;
+ } else {
+ ret = LTTCOMM_FATAL;
+ }
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_DESTROY_SESSION:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Clean kernel session teardown */
+ teardown_kernel_session(cmd_ctx->session);
+
+ ret = destroy_session(cmd_ctx->lsm->session_name);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ /*
+ case LTTNG_LIST_TRACES:
+ {
+ unsigned int trace_count;
+
+ trace_count = get_trace_count_per_session(cmd_ctx->session);
+ if (trace_count == 0) {
+ ret = LTTCOMM_NO_TRACE;
+ goto error;
+ }
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_traces_per_session(cmd_ctx->session,
+ (struct lttng_trace *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ */
+ /*
+ case UST_CREATE_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = ust_create_trace(cmd_ctx);
+ if (ret < 0) {
+ goto error;
+ }
+ break;
+ }
+ */
+ case LTTNG_LIST_TRACEABLE_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 error;
+ }
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ /*
+ case UST_START_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = ust_start_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
+ }
+ case UST_STOP_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = ust_stop_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
+ }
+ */
+ case LTTNG_LIST_SESSIONS:
+ {
+ unsigned int session_count;
-/*
- * copy_common_data
- *
- * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg
- */
-static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm)
-{
- llm->cmd_type = lsm->cmd_type;
- llm->pid = lsm->pid;
+ session_count = get_session_count();
+ if (session_count == 0) {
+ ret = LTTCOMM_NO_SESSION;
+ goto error;
+ }
- /* Manage uuid */
- if (!uuid_is_null(lsm->session_id)) {
- uuid_copy(llm->session_id, lsm->session_id);
- }
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
- strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name));
- llm->trace_name[strlen(llm->trace_name) - 1] = '\0';
-}
+ get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
-/*
- * setup_data_buffer
- *
- * Setup the outgoing data buffer for the response
- * data allocating the right amount of memory.
- *
- * Return total size of the buffer pointed by buf.
- */
-static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm)
-{
- int ret = 0;
- size_t buf_size;
+ ret = LTTCOMM_OK;
+ break;
+ }
+ default:
+ /* Undefined command */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- buf_size = sizeof(struct lttcomm_lttng_msg) + s_data;
- *buf = malloc(buf_size);
- if (*buf == NULL) {
- perror("malloc");
- ret = -1;
- goto error;
+ ret = LTTCOMM_UND;
+ break;
}
- /* Setup lttcomm_lttng_msg data and copy
- * it to the newly allocated buffer.
- */
- llm->size_payload = s_data;
- memcpy(*buf, llm, sizeof(struct lttcomm_lttng_msg));
+ /* Set return code */
+ cmd_ctx->llm->ret_code = ret;
- return buf_size;
+ return 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 */
+ cmd_ctx->llm->ret_code = ret;
+
+setup_error:
return ret;
}
/*
- * 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).
+ * thread_manage_clients
*
- * Return any error encountered or 0 for success.
+ * This thread manage all clients request using the unix
+ * client socket for communication.
*/
-static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
+static void *thread_manage_clients(void *data)
{
- int ret;
- int buf_size;
- size_t header_size;
- char *send_buf = NULL;
- struct lttcomm_lttng_msg llm;
-
- DBG("Processing client message");
+ int sock, ret;
+ struct command_ctx *cmd_ctx;
- /* Copy common data to identify the response
- * on the lttng client side.
- */
- copy_common_data(&llm, lsm);
+ DBG("[thread] Manage client started");
- /* Check command that needs a session */
- if (lsm->cmd_type != LTTNG_CREATE_SESSION &&
- lsm->cmd_type != LTTNG_LIST_SESSIONS &&
- lsm->cmd_type != UST_LIST_APPS)
- {
- current_session = find_session_by_uuid(lsm->session_id);
- if (current_session == NULL) {
- ret = LTTCOMM_SELECT_SESS;
- goto end;
- }
+ ret = lttcomm_listen_unix_sock(client_sock);
+ if (ret < 0) {
+ goto error;
}
- /* Default return code.
- * In our world, everything is OK... right? ;)
+ /* Notify parent pid that we are ready
+ * to accept command for client side.
*/
- llm.ret_code = LTTCOMM_OK;
-
- header_size = sizeof(struct lttcomm_lttng_msg);
-
- /* Process by command type */
- switch (lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- {
- ret = create_session(lsm->session_name, &llm.session_id);
- if (ret < 0) {
- if (ret == -1) {
- ret = LTTCOMM_EXIST_SESS;
- } else {
- ret = LTTCOMM_FATAL;
- }
- goto end;
- }
-
- buf_size = setup_data_buffer(&send_buf, 0, &llm);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
-
- break;
- }
- case LTTNG_DESTROY_SESSION:
- {
- ret = destroy_session(&lsm->session_id);
- if (ret < 0) {
- ret = LTTCOMM_NO_SESS;
- } else {
- ret = LTTCOMM_OK;
- }
-
- /* No auxiliary data so only send the llm struct. */
- goto end;
- }
- case UST_CREATE_TRACE:
- {
- ret = ust_create_trace(lsm->pid);
- 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;
- }
+ if (opt_sig_parent) {
+ kill(ppid, SIGCHLD);
+ }
- /* No auxiliary data so only send the llm struct. */
- goto end;
+ while (1) {
+ /* Blocking call, waiting for transmission */
+ DBG("Accepting client command ...");
+ sock = lttcomm_accept_unix_sock(client_sock);
+ if (sock < 0) {
+ goto error;
}
- case UST_LIST_APPS:
- {
- unsigned int app_count = get_app_count();
- /* Stop right now if no apps */
- if (app_count == 0) {
- ret = LTTCOMM_NO_APPS;
- goto end;
- }
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- sizeof(pid_t) * app_count, &llm);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
+ /* Allocate context command to process the client request */
+ cmd_ctx = malloc(sizeof(struct command_ctx));
- get_app_list_pids((pid_t *)(send_buf + header_size));
-
- break;
- }
- case UST_START_TRACE:
- {
- ret = ust_start_trace(lsm->pid);
+ /* Allocate data buffer for reception */
+ cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
+ cmd_ctx->llm = NULL;
+ cmd_ctx->session = NULL;
- /* No auxiliary data so only send the llm struct. */
- goto end;
+ /*
+ * 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;
}
- case LTTNG_LIST_SESSIONS:
- {
- unsigned int session_count = get_session_count();
- /* Stop right now if no session */
- if (session_count == 0) {
- ret = LTTCOMM_NO_SESS;
- goto end;
- }
-
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- (sizeof(struct lttng_session) * session_count), &llm);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
- get_lttng_session((struct lttng_session *)(send_buf + header_size));
+ // TODO: Validate cmd_ctx including sanity check for security purpose.
- break;
+ /*
+ * 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;
}
- default:
- {
- /* Undefined command */
- ret = LTTCOMM_UND;
- goto end;
+
+ 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");
}
- }
- ret = send_unix_sock(sock, send_buf, buf_size);
+ clean_command_ctx(cmd_ctx);
- if (send_buf != NULL) {
- free(send_buf);
+ /* End of transmission */
+ close(sock);
}
- return ret;
-
-end:
- /* Notify client of error */
- llm.ret_code = ret;
- llm.size_payload = 0;
- send_unix_sock(sock, (void*) &llm, sizeof(llm));
-
- return ret;
+error:
+ return NULL;
}
+
/*
* usage function on stderr
*/
static void usage(void)
{
fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
- fprintf(stderr, " -h, --help Display this usage.\n");
- fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
- fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket.\n");
- fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
- fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
- fprintf(stderr, " -V, --version Show version number.\n");
- fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
- fprintf(stderr, " -q, --quiet No output at all.\n");
- fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
+ fprintf(stderr, " -h, --help Display this usage.\n");
+ fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
+ fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
+ fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
+ fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
+ fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
+ fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
+ fprintf(stderr, " -V, --version Show version number.\n");
+ fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
+ fprintf(stderr, " -q, --quiet No output at all.\n");
+ fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
}
/*
static struct option long_options[] = {
{ "client-sock", 1, 0, 'c' },
{ "apps-sock", 1, 0, 'a' },
+ { "kconsumerd-cmd-sock", 1, 0, 0 },
+ { "kconsumerd-err-sock", 1, 0, 0 },
{ "daemonize", 0, 0, 'd' },
{ "sig-parent", 0, 0, 'S' },
{ "help", 0, 0, 'h' },
while (1) {
int option_index = 0;
- c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:", long_options, &option_index);
+ c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index);
if (c == -1) {
break;
}
case 'S':
opt_sig_parent = 1;
break;
+ case 'E':
+ snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
+ break;
+ case 'C':
+ snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
+ break;
case 'q':
opt_quiet = 1;
break;
* init_daemon_socket
*
* Creates the two needed socket by the daemon.
- * apps_socket - The communication socket for all UST apps.
- * client_socket - The communication of the cli tool (lttng).
+ * apps_sock - The communication socket for all UST apps.
+ * client_sock - The communication of the cli tool (lttng).
*/
static int init_daemon_socket()
{
old_umask = umask(0);
/* Create client tool unix socket */
- client_socket = lttcomm_create_unix_sock(client_unix_sock_path);
- if (client_socket < 0) {
+ client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
+ if (client_sock < 0) {
+ ERR("Create unix sock failed: %s", client_unix_sock_path);
ret = -1;
goto end;
}
/* File permission MUST be 660 */
ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (ret < 0) {
+ ERR("Set file permissions failed: %s", client_unix_sock_path);
perror("chmod");
goto end;
}
/* Create the application unix socket */
- apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path);
- if (apps_socket < 0) {
+ apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
+ if (apps_sock < 0) {
+ ERR("Create unix sock failed: %s", apps_unix_sock_path);
ret = -1;
goto end;
}
- /* File permission MUST be 660 */
+ /* File permission MUST be 666 */
ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (ret < 0) {
+ ERR("Set file permissions failed: %s", apps_unix_sock_path);
perror("chmod");
goto end;
}
}
/*
- * set_socket_perms
+ * set_permissions
*
- * Set the tracing group gid onto the client socket.
+ * Set the tracing group gid onto the client socket.
+ *
+ * Race window between mkdir and chown is OK because we are going from
+ * less permissive (root.root) to more permissive (root.tracing).
*/
-static int set_socket_perms(void)
+static int set_permissions(void)
{
int ret;
struct group *grp;
goto end;
}
+ /* Set lttng run dir */
+ ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
+ if (ret < 0) {
+ ERR("Unable to set group on " LTTNG_RUNDIR);
+ perror("chown");
+ }
+
+ /* lttng client socket path */
ret = chown(client_unix_sock_path, 0, grp->gr_gid);
if (ret < 0) {
+ ERR("Unable to set group on %s", client_unix_sock_path);
+ perror("chown");
+ }
+
+ /* kconsumerd error socket path */
+ ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
+ if (ret < 0) {
+ ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
perror("chown");
}
- DBG("Sockets permissions set");
+ DBG("All permissions are set");
end:
return ret;
}
/*
- * set_signal_handler
+ * create_lttng_rundir
*
- * Setup signal handler for :
- * SIGINT, SIGTERM, SIGPIPE
+ * Create the lttng run directory needed for all
+ * global sockets and pipe.
*/
-static int set_signal_handler(void)
+static int create_lttng_rundir(void)
{
- int ret = 0;
- struct sigaction sa;
- sigset_t sigset;
+ int ret;
- if ((ret = sigemptyset(&sigset)) < 0) {
- perror("sigemptyset");
- return ret;
+ ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ ERR("Unable to create " LTTNG_RUNDIR);
+ goto error;
+ } else {
+ ret = 0;
+ }
}
- sa.sa_handler = sighandler;
- sa.sa_mask = sigset;
- sa.sa_flags = 0;
- if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
+error:
+ return ret;
+}
+
+/*
+ * set_kconsumerd_sockets
+ *
+ * Setup sockets and directory needed by the kconsumerd
+ * communication with the session daemon.
+ */
+static int set_kconsumerd_sockets(void)
+{
+ int ret;
+
+ if (strlen(kconsumerd_err_unix_sock_path) == 0) {
+ snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
}
- if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
+ if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
+ snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
}
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
+ ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ ERR("Failed to create " KCONSUMERD_PATH);
+ goto error;
+ }
+ ret = 0;
}
- DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
+ /* Create the kconsumerd error unix socket */
+ kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
+ if (kconsumerd_err_sock < 0) {
+ ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
+ ret = -1;
+ goto error;
+ }
+
+ /* File permission MUST be 660 */
+ ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (ret < 0) {
+ ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
+ perror("chmod");
+ goto error;
+ }
+error:
return ret;
}
-/**
+/*
* sighandler
*
* Signal handler for the daemon
}
/*
- * cleanup
+ * set_signal_handler
*
- * Cleanup the daemon on exit
+ * Setup signal handler for :
+ * SIGINT, SIGTERM, SIGPIPE
*/
-static void cleanup()
+static int set_signal_handler(void)
{
- DBG("Cleaning up");
+ int ret = 0;
+ struct sigaction sa;
+ sigset_t sigset;
- /* <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> */
+ if ((ret = sigemptyset(&sigset)) < 0) {
+ perror("sigemptyset");
+ return ret;
+ }
- unlink(client_unix_sock_path);
- unlink(apps_unix_sock_path);
+ sa.sa_handler = sighandler;
+ sa.sa_mask = sigset;
+ sa.sa_flags = 0;
+ if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
+
+ return ret;
+}
+
+/*
+ * set_ulimit
+ *
+ * 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 set_ulimit(void)
+{
+ int ret;
+ struct rlimit lim;
+
+ lim.rlim_cur = 65535;
+ lim.rlim_max = 65535;
+
+ ret = setrlimit(RLIMIT_NOFILE, &lim);
+ if (ret < 0) {
+ 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];
/* Set all sockets path */
if (is_root) {
+ ret = create_lttng_rundir();
+ if (ret < 0) {
+ goto error;
+ }
+
if (strlen(apps_unix_sock_path) == 0) {
- (snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_UNIX_SOCK));
+ snprintf(apps_unix_sock_path, PATH_MAX,
+ DEFAULT_GLOBAL_APPS_UNIX_SOCK);
}
if (strlen(client_unix_sock_path) == 0) {
- (snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_CLIENT_UNIX_SOCK));
+ snprintf(client_unix_sock_path, PATH_MAX,
+ DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
+ }
+
+ ret = set_kconsumerd_sockets();
+ 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,
- DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()));
+ snprintf(apps_unix_sock_path, PATH_MAX,
+ DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir());
}
/* Set the cli tool unix socket path */
if (strlen(client_unix_sock_path) == 0) {
- (snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()));
+ snprintf(client_unix_sock_path, PATH_MAX,
+ DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir());
}
}
+ 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
*/
if ((ret = check_existing_daemon()) == 0) {
ERR("Already running daemon.\n");
/* We do not goto error because we must not
- * cleanup() because a daemon is already working.
+ * cleanup() because a daemon is already running.
*/
- return EXIT_FAILURE;
+ exit(EXIT_FAILURE);
}
if (set_signal_handler() < 0) {
goto error;
}
- /* Setup the two needed unix socket */
+ /* Setup the needed unix socket */
if (init_daemon_socket() < 0) {
goto error;
}
/* Set credentials to socket */
- if (is_root && (set_socket_perms() < 0)) {
+ if (is_root && (set_permissions() < 0)) {
goto error;
}
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;
}
}
cleanup();
- return 0;
+ exit(EXIT_SUCCESS);
error:
cleanup();
-
- return EXIT_FAILURE;
+ exit(EXIT_FAILURE);
}
projects / lttng-tools.git / blobdiff