#include <urcu/list.h> /* URCU list library (-lurcu) */
#include <ust/ustctl.h> /* UST control lib (-lust) */
+#include <lttng/liblttngctl.h>
#include "liblttsessiondcomm.h"
#include "ltt-sessiond.h"
+#include "lttngerr.h"
+/* Const values */
const char default_home_dir[] = DEFAULT_HOME_DIR;
const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
/* Static functions */
static int set_signal_handler(void);
static int set_socket_perms(void);
-static void sighandler(int);
-static void daemonize(void);
+static void sighandler(int sig);
static void cleanup(void);
+static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm);
static int check_existing_daemon(void);
-static int notify_apps(const char*);
-static int connect_app(pid_t);
+static int notify_apps(const char* name);
+static int connect_app(pid_t pid);
static int init_daemon_socket(void);
-static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg*);
+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 setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_msg *llm);
-static void *thread_manage_clients(void *);
-static void *thread_manage_apps(void *);
+/* Command function */
+static void get_list_apps(pid_t *pids);
+static void get_list_sessions(struct lttng_session *lt);
-static int create_session(const char*, uuid_t *);
-static void destroy_session(uuid_t);
+static void *thread_manage_clients(void *data);
+static void *thread_manage_apps(void *data);
-static struct ltt_session *find_session(uuid_t);
+static int create_session(char *name, uuid_t *session_id);
+static int destroy_session(uuid_t *uuid);
+
+static struct ltt_session *find_session_by_uuid(uuid_t session_id);
+static struct ltt_session *find_session_by_name(char *name);
/* Variables */
const char *progname;
const char *opt_tracing_group;
+static int opt_sig_parent;
static int opt_daemon;
+int opt_verbose;
+int opt_quiet;
static int is_root; /* Set to 1 if the daemon is running as root */
+static pid_t ppid;
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 int apps_socket;
static struct ltt_session *current_session;
-static int session_count;
+
+/* Number of element for the list below. */
+static unsigned int session_count;
+static unsigned int traceable_app_count;
/* Init session's list */
static struct ltt_session_list ltt_session_list = {
.head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
};
+/* Init ust traceabl application's list */
static struct ltt_traceable_app_list ltt_traceable_app_list = {
.head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
};
lta->pid = reg_msg.pid;
lta->uid = reg_msg.uid;
cds_list_add(<a->list, <t_traceable_app_list.head);
+ traceable_app_count++;
} else {
/* Unregistering */
lta = NULL;
cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) {
if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) {
cds_list_del(<a->list);
+ /* Check to not overflow here */
+ if (traceable_app_count != 0) {
+ traceable_app_count--;
+ }
break;
}
}
{
int sock, ret;
struct lttcomm_session_msg lsm;
- struct lttcomm_lttng_msg *llm;
ret = lttcomm_listen_unix_sock(client_socket);
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 */
sock = lttcomm_accept_unix_sock(client_socket);
* request of the client.
*/
ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
- if (ret < 0) {
+ if (ret <= 0) {
continue;
}
/* This function dispatch the work to the LTTng or UST libs
- * and make sure that the reply structure (llm) is filled.
- */
- llm = process_client_msg(&lsm);
-
- /* Having a valid lttcomm_lttng_msg struct, reply is sent back
- * to the client directly.
+ * 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.
*/
- if (llm != NULL) {
- ret = lttcomm_send_unix_sock(sock, llm,
- sizeof(struct lttcomm_lttng_msg));
- free(llm);
- if (ret < 0) {
- continue;
- }
- } else {
- /* The lttcomm_lttng_msg struct was not allocated
- * correctly. Fatal error since the daemon is not able
- * to respond. However, we still permit client connection.
- *
- * TODO: We should have a default llm that tells the client
- * that the sessiond had a fatal error and thus the client could
- * take action to restart ltt-sessiond or inform someone.
- */
+ ret = process_client_msg(sock, &lsm);
+ if (ret < 0) {
+ /* Error detected but still accept command */
+ continue;
}
}
return NULL;
}
+/*
+ * 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;
+ }
+
+ return lttcomm_send_unix_sock(sock, buf, len);
+}
+
/*
* connect_app
*
sock = ustctl_connect_pid(pid);
if (sock < 0) {
- fprintf(stderr, "Fail connecting to the PID %d\n", pid);
+ ERR("Fail connecting to the PID %d\n", pid);
}
return sock;
}
/*
- * find_session
+ * find_session_by_uuid
*
* Return a ltt_session structure ptr that matches the uuid.
*/
-static struct ltt_session *find_session(uuid_t session_id)
+static struct ltt_session *find_session_by_uuid(uuid_t session_id)
{
- struct ltt_session *iter = NULL;
+ int found = 0;
+ struct ltt_session *iter;
/* Sanity check for NULL session_id */
if (uuid_is_null(session_id)) {
}
cds_list_for_each_entry(iter, <t_session_list.head, list) {
- if (uuid_compare(iter->uuid, session_id)) {
+ if (uuid_compare(iter->uuid, session_id) == 0) {
+ found = 1;
break;
}
}
end:
+ if (!found) {
+ iter = NULL;
+ }
+ return iter;
+}
+
+/*
+ * find_session_by_name
+ *
+ * Return a ltt_session structure ptr that matches name.
+ * If no session found, NULL is returned.
+ */
+static struct ltt_session *find_session_by_name(char *name)
+{
+ int found = 0;
+ struct ltt_session *iter;
+
+ cds_list_for_each_entry(iter, <t_session_list.head, list) {
+ if (strncmp(iter->name, name, strlen(iter->name)) == 0) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ iter = NULL;
+ }
+
return iter;
}
*
* Delete session from the global session list
* and free the memory.
+ *
+ * Return -1 if no session is found.
+ * On success, return 1;
*/
-static void destroy_session(uuid_t session_id)
+static int destroy_session(uuid_t *uuid)
{
- struct ltt_session *iter = NULL;
+ int found = -1;
+ struct ltt_session *iter;
cds_list_for_each_entry(iter, <t_session_list.head, list) {
- if (uuid_compare(iter->uuid, session_id)) {
+ if (uuid_compare(iter->uuid, *uuid) == 0) {
cds_list_del(&iter->list);
+ free(iter);
+ session_count--;
+ found = 1;
break;
}
}
- if (iter) {
- free(iter);
- session_count--;
- }
+ return found;
}
/*
* create_session
*
- * Create a brand new session,
+ * Create a brand new session and add it to the
+ * global session list.
*/
-static int create_session(const char *name, uuid_t *session_id)
+static int create_session(char *name, uuid_t *session_id)
{
struct ltt_session *new_session;
}
} else {
/* Generate session name based on the session count */
- if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) {
+ if (asprintf(&new_session->name, "%s%d", "lttng-", session_count) < 0) {
goto error;
}
}
}
/*
- * ust_list_apps
+ * get_list_apps
*
* List traceable user-space application and fill an
* array of pids.
- *
- * Return size of the array.
*/
-static size_t ust_list_apps(pid_t *pids)
+static void get_list_apps(pid_t *pids)
{
- size_t size = 0;
- struct ltt_traceable_app *iter = NULL;
+ int i = 0;
+ struct ltt_traceable_app *iter;
+ /* TODO: Mutex needed to access this list */
cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) {
- if (size >= MAX_APPS_PID) {
- break;
- }
+ pids[i] = iter->pid;
+ i++;
+ }
+}
+
+/*
+ * get_list_sessions
+ *
+ * List sessions and fill the data buffer.
+ */
+static void get_list_sessions(struct lttng_session *lt)
+{
+ int i = 0;
+ struct ltt_session *iter;
+ struct lttng_session lsess;
- pids[size] = iter->pid;
- size++;
+ /* Iterate over session list and append data after
+ * the control struct in the buffer.
+ */
+ cds_list_for_each_entry(iter, <t_session_list.head, list) {
+ /* Copy name and uuid */
+ uuid_unparse(iter->uuid, lsess.uuid);
+ strncpy(lsess.name, iter->name, sizeof(lsess.name));
+ lsess.name[sizeof(lsess.name) - 1] = '\0';
+ memcpy(<[i], &lsess, sizeof(lsess));
+ i++;
+ /* Reset struct for next pass */
+ memset(&lsess, 0, sizeof(lsess));
}
+}
- return size;
+/*
+ * 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;
+
+ /* Manage uuid */
+ if (!uuid_is_null(lsm->session_id)) {
+ uuid_copy(llm->session_id, lsm->session_id);
+ }
+
+ strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name));
+ llm->trace_name[strlen(llm->trace_name) - 1] = '\0';
}
/*
- * process_client_msg
+ * setup_data_buffer
*
- * This takes the lttcomm_session_msg struct and process the command requested
- * by the client. It then creates the reply by allocating a lttcomm_lttng_msg
- * and fill it with the necessary information.
+ * Setup the outgoing data buffer for the response
+ * data allocating the right amount of memory.
*
- * It's the caller responsability to free that structure when done with it.
- *
- * Return pointer to lttcomm_lttng_msg allocated struct.
+ * Return total size of the buffer pointed by buf.
*/
-static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg *lsm)
+static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm)
{
- struct lttcomm_lttng_msg *llm;
+ int ret = 0;
+ size_t buf_size;
- /* Allocate the reply message structure */
- llm = malloc(sizeof(struct lttcomm_lttng_msg));
- if (llm == NULL) {
+ buf_size = sizeof(struct lttcomm_lttng_msg) + s_data;
+ *buf = malloc(buf_size);
+ if (*buf == NULL) {
perror("malloc");
- goto end;
+ ret = -1;
+ goto error;
}
+ /* 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));
+
+ return buf_size;
+
+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).
+ *
+ * Return any error encountered or 0 for success.
+ */
+static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
+{
+ int ret;
+ int buf_size;
+ char *send_buf = NULL;
+ struct lttcomm_lttng_msg llm;
+
/* Copy common data to identify the response
* on the lttng client side.
*/
- llm->cmd_type = lsm->cmd_type;
- llm->pid = lsm->pid;
- if (!uuid_is_null(lsm->session_id)) {
- uuid_copy(llm->session_id, lsm->session_id);
- }
- strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
+ copy_common_data(&llm, lsm);
/* Default return code.
- * In a our world, everything is OK... right?
+ * In our world, everything is OK... right? ;)
*/
- llm->ret_code = LTTCOMM_OK;
+ llm.ret_code = LTTCOMM_OK;
/* Process by command type */
switch (lsm->cmd_type) {
+ case LTTNG_CREATE_SESSION:
+ {
+ ret = create_session(lsm->session_name, &llm.session_id);
+ if (ret < 0) {
+ 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:
+ {
+ int sock;
+ sock = connect_app(lsm->pid);
+
+ ret = ustctl_create_trace(sock, "auto");
+ if (ret < 0) {
+ ret = LTTCOMM_CREATE_FAIL;
+ } else {
+ ret = LTTCOMM_OK;
+ }
+
+ goto end;
+ }
case UST_LIST_APPS:
{
- llm->u.list_apps.size = ust_list_apps(llm->u.list_apps.pids);
+ /* Stop right now if no apps */
+ if (traceable_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) * traceable_app_count, &llm);
+ if (buf_size < 0) {
+ ret = LTTCOMM_FATAL;
+ goto end;
+ }
+
+ get_list_apps((pid_t *)(send_buf + sizeof(struct lttcomm_lttng_msg)));
+
+ break;
+ }
+ case LTTNG_LIST_SESSIONS:
+ {
+ /* 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_list_sessions((struct lttng_session *)(send_buf + sizeof(struct lttcomm_lttng_msg)));
+
break;
}
default:
+ {
/* Undefined command */
- llm->ret_code = LTTCOMM_UND;
- break;
+ ret = LTTCOMM_UND;
+ goto end;
+ }
+ }
+
+ ret = send_unix_sock(sock, send_buf, buf_size);
+
+ if (send_buf != NULL) {
+ free(send_buf);
}
+ return ret;
+
end:
- return llm;
+ /* Notify client of error */
+ llm.ret_code = ret;
+ llm.size_payload = 0;
+ send_unix_sock(sock, (void*) &llm, sizeof(llm));
+
+ return ret;
}
/*
"\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n"
"\t-d, --daemonize\t\tStart as a daemon.\n"
"\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n"
- "\t-V, --version\t\tShow version number.\n",
+ "\t-V, --version\t\tShow version number.\n"
+ "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n"
+ "\t-q, --quiet\t\tNo output at all.\n",
progname);
}
{ "client-sock", 1, 0, 'c' },
{ "apps-sock", 1, 0, 'a' },
{ "daemonize", 0, 0, 'd' },
+ { "sig-parent", 0, 0, 'S' },
{ "help", 0, 0, 'h' },
{ "group", 1, 0, 'g' },
{ "version", 0, 0, 'V' },
+ { "quiet", 0, 0, 'q' },
{ NULL, 0, 0, 0 }
};
while (1) {
int option_index = 0;
- c = getopt_long(argc, argv, "dhV" "a:c:g:s:", long_options, &option_index);
+ c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index);
if (c == -1) {
break;
}
case 'V':
fprintf(stdout, "%s\n", VERSION);
exit(EXIT_SUCCESS);
+ case 'S':
+ opt_sig_parent = 1;
+ break;
+ case 'q':
+ opt_quiet = 1;
+ break;
default:
/* Unknown option or other error.
* Error is printed by getopt, just return */
(grp = getgrnam(default_tracing_group));
if (grp == NULL) {
- fprintf(stderr, "Missing tracing group. Aborting execution.\n");
+ ERR("Missing tracing group. Aborting execution.\n");
ret = -1;
goto end;
}
return ret;
}
-/*
- * daemonize
- *
- * Daemonize ltt-sessiond.
- */
-static void daemonize(void)
-{
- pid_t pid, sid;
- const char *home_dir = get_home_dir();
-
- /* Fork off the parent process */
- if ((pid = fork()) < 0) {
- perror("fork");
- exit(EXIT_FAILURE);
- }
-
- /* Parent can now exit */
- if (pid > 0) {
- exit(EXIT_SUCCESS);
- }
-
- /* Change the file mode mask */
- umask(0);
-
- /* Create a new SID for the child process */
- if ((sid = setsid()) < 0) {
- perror("setsid");
- exit(EXIT_FAILURE);
- }
-
- /* Change the current working directory */
- if ((chdir(home_dir)) < 0) {
- perror("chdir");
- exit(EXIT_FAILURE);
- }
-
- /* Close out the standard file descriptors */
- close(STDIN_FILENO);
- close(STDOUT_FILENO);
- close(STDERR_FILENO);
-}
-
/*
* set_signal_handler
*
{
switch (sig) {
case SIGPIPE:
+ return;
case SIGINT:
case SIGTERM:
cleanup();
static void cleanup()
{
/* <fun> */
- fprintf(stdout, "\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
- fprintf(stdout, "%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0);
+ MSG("\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
+ MSG("%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0);
/* </fun> */
unlink(client_unix_sock_path);
/* Daemonize */
if (opt_daemon) {
- daemonize();
+ ret = daemon(0, 0);
+ if (ret < 0) {
+ perror("daemon");
+ goto error;
+ }
}
/* Check if daemon is UID = 0 */
* socket needed by the daemon are present, this test fails
*/
if ((ret = check_existing_daemon()) == 0) {
- fprintf(stderr, "Already running daemon.\n");
+ ERR("Already running daemon.\n");
goto error;
}
goto error;
}
+ /* Get parent pid if -S, --sig-parent is specified. */
+ if (opt_sig_parent) {
+ ppid = getppid();
+ }
+
while (1) {
/* Create thread to manage the client socket */
ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL);
projects / lttng-tools.git / blobdiff