X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=ltt-sessiond%2Fmain.c;h=150f211fb825a44e1e614a3222744d7edf51a4bc;hb=ee0326c0c46f4b02e9eab0b2917b62d2c55aa346;hp=418875a2aa453313406f8d0f4b92594c80049bd9;hpb=5b74c7b1ca96399ba5c8bd0ce6974aea671198eb;p=lttng-tools.git diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c index 418875a2a..150f211fb 100644 --- a/ltt-sessiond/main.c +++ b/ltt-sessiond/main.c @@ -5,12 +5,12 @@ * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. - * + * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. - * + * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. @@ -41,6 +41,8 @@ #include "ltt-sessiond.h" #include "lttngerr.h" #include "session.h" +#include "trace.h" +#include "traceable-app.h" /* Const values */ const char default_home_dir[] = DEFAULT_HOME_DIR; @@ -49,35 +51,29 @@ const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; /* Static functions */ -static int set_signal_handler(void); -static int set_socket_perms(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* name); static int connect_app(pid_t pid); -static int find_app_by_pid(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 add_traceable_app(struct ltt_traceable_app *lta); -static void del_traceable_app(struct ltt_traceable_app *lta); - -/* Command function */ -static void get_list_apps(pid_t *pids); +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; 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; @@ -89,17 +85,6 @@ static int apps_socket; static struct ltt_session *current_session; -/* Number of element for the list below. */ -static unsigned int traceable_app_count; - -/* 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), -}; - -/* List mutex */ -pthread_mutex_t ltt_traceable_app_list_mutex; - /* * thread_manage_apps * @@ -108,7 +93,6 @@ pthread_mutex_t ltt_traceable_app_list_mutex; static void *thread_manage_apps(void *data) { int sock, ret; - struct ltt_traceable_app *lta; /* TODO: Something more elegant is needed but fine for now */ struct { @@ -117,6 +101,8 @@ static void *thread_manage_apps(void *data) uid_t uid; } reg_msg; + DBG("[thread] Manage apps started"); + /* Notify all applications to register */ notify_apps(default_global_apps_pipe); @@ -144,19 +130,16 @@ static void *thread_manage_apps(void *data) /* Add application to the global traceable list */ if (reg_msg.reg == 1) { /* Registering */ - lta = malloc(sizeof(struct ltt_traceable_app)); - lta->pid = reg_msg.pid; - lta->uid = reg_msg.uid; - add_traceable_app(lta); + 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 */ - cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { - if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { - del_traceable_app(lta); - free(lta); - break; - } - } + unregister_traceable_app(reg_msg.pid); } } @@ -176,6 +159,8 @@ static void *thread_manage_clients(void *data) int sock, ret; struct lttcomm_session_msg lsm; + DBG("[thread] Manage client started"); + ret = lttcomm_listen_unix_sock(client_socket); if (ret < 0) { goto error; @@ -221,37 +206,6 @@ error: return NULL; } -/* - * add_traceable_app - * - * Add a traceable application structure to the global - * list protected by a mutex. - */ -static void add_traceable_app(struct ltt_traceable_app *lta) -{ - pthread_mutex_lock(<t_traceable_app_list_mutex); - cds_list_add(<a->list, <t_traceable_app_list.head); - traceable_app_count++; - pthread_mutex_unlock(<t_traceable_app_list_mutex); -} - -/* - * del_traceable_app - * - * Delete a traceable application structure from the - * global list protected by a mutex. - */ -static void del_traceable_app(struct ltt_traceable_app *lta) -{ - pthread_mutex_lock(<t_traceable_app_list_mutex); - cds_list_del(<a->list); - /* Sanity check */ - if (traceable_app_count != 0) { - traceable_app_count--; - } - pthread_mutex_unlock(<t_traceable_app_list_mutex); -} - /* * send_unix_sock * @@ -280,14 +234,18 @@ static int send_unix_sock(int sock, void *buf, size_t len) */ static int connect_app(pid_t pid) { - int sock, ret; + int sock; + struct ltt_traceable_app *lta; - ret = find_app_by_pid(pid); - if (ret == 0) { + DBG("Connect to application pid %d", pid); + + lta = find_app_by_pid(pid); + if (lta == NULL) { + /* App not found */ return -1; } - sock = ustctl_connect_pid(pid); + sock = ustctl_connect_pid(lta->pid); if (sock < 0) { ERR("Fail connecting to the PID %d\n", pid); } @@ -309,6 +267,8 @@ static int notify_apps(const char *name) int fd; int ret = -1; + DBG("Notify the global application pipe"); + /* Try opening the global pipe */ fd = open(name, O_WRONLY); if (fd < 0) { @@ -325,29 +285,6 @@ error: return ret; } -/* - * find_app_by_pid - * - * Iterate over the traceable apps list. - * On success, return 1, else return 0 - */ -static int find_app_by_pid(pid_t pid) -{ - struct ltt_traceable_app *iter; - - pthread_mutex_lock(<t_traceable_app_list_mutex); - cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { - if (iter->pid == pid) { - pthread_mutex_unlock(<t_traceable_app_list_mutex); - /* Found */ - return 1; - } - } - pthread_mutex_unlock(<t_traceable_app_list_mutex); - - return 0; -} - /* * ust_create_trace * @@ -360,6 +297,8 @@ static int ust_create_trace(pid_t pid) int sock, ret; struct ltt_ust_trace *trace; + DBG("Creating trace for pid %d", pid); + trace = malloc(sizeof(struct ltt_ust_trace)); if (trace == NULL) { perror("malloc"); @@ -370,6 +309,11 @@ static int ust_create_trace(pid_t pid) /* Init */ trace->pid = pid; trace->shmid = 0; + /* NOTE: to be removed. Trace name will no longer be + * required for LTTng userspace tracer. For now, we set it + * to 'auto' for API compliance. + */ + snprintf(trace->name, 5, "auto"); /* Connect to app using ustctl API */ sock = connect_app(pid); @@ -378,7 +322,7 @@ static int ust_create_trace(pid_t pid) goto error; } - ret = ustctl_create_trace(sock, "auto"); + ret = ustctl_create_trace(sock, trace->name); if (ret < 0) { ret = LTTCOMM_CREATE_FAIL; goto error; @@ -387,6 +331,7 @@ static int ust_create_trace(pid_t pid) /* Check if current session is valid */ if (current_session) { cds_list_add(&trace->list, ¤t_session->ust_traces); + current_session->ust_trace_count++; } error: @@ -394,25 +339,75 @@ error: } /* - * get_list_apps + * ust_start_trace * - * List traceable user-space application and fill an - * array of pids. + * Start a trace. This trace, identified by the pid, must be + * in the current session ust_traces list. */ -static void get_list_apps(pid_t *pids) +static int ust_start_trace(pid_t pid) { - int i = 0; - struct ltt_traceable_app *iter; + int sock, ret; + struct ltt_ust_trace *trace; - /* Protected by a mutex here because the threads manage_client - * and manage_apps can access this list. - */ - pthread_mutex_lock(<t_traceable_app_list_mutex); - cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { - pids[i] = iter->pid; - i++; + DBG("Starting trace for pid %d", pid); + + trace = find_session_ust_trace_by_pid(current_session, pid); + if (trace == NULL) { + ret = LTTCOMM_NO_TRACE; + goto error; + } + + /* Connect to app using ustctl API */ + sock = connect_app(pid); + if (sock < 0) { + ret = LTTCOMM_NO_TRACEABLE; + goto error; } - pthread_mutex_unlock(<t_traceable_app_list_mutex); + + ret = ustctl_start_trace(sock, "auto"); + if (ret < 0) { + ret = LTTCOMM_START_FAIL; + goto error; + } + +error: + return ret; +} + +/* + * ust_stop_trace + * + * Stop a trace. This trace, identified by the pid, must be + * in the current session ust_traces list. + */ +static int ust_stop_trace(pid_t pid) +{ + int sock, ret; + struct ltt_ust_trace *trace; + + DBG("Stopping trace for pid %d", pid); + + trace = find_session_ust_trace_by_pid(current_session, pid); + if (trace == NULL) { + ret = LTTCOMM_NO_TRACE; + goto error; + } + + /* Connect to app using ustctl API */ + sock = connect_app(pid); + if (sock < 0) { + ret = LTTCOMM_NO_TRACEABLE; + goto error; + } + + ret = ustctl_stop_trace(sock, trace->name); + if (ret < 0) { + ret = LTTCOMM_STOP_FAIL; + goto error; + } + +error: + return ret; } /* @@ -484,6 +479,8 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) char *send_buf = NULL; struct lttcomm_lttng_msg llm; + DBG("Processing client message"); + /* Copy common data to identify the response * on the lttng client side. */ @@ -542,11 +539,33 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) /* No auxiliary data so only send the llm struct. */ goto end; } + case LTTNG_LIST_TRACES: + { + unsigned int trace_count = get_trace_count_per_session(current_session); + + if (trace_count == 0) { + ret = LTTCOMM_NO_TRACE; + goto end; + } + + buf_size = setup_data_buffer(&send_buf, + sizeof(struct lttng_trace) * trace_count, &llm); + if (buf_size < 0) { + ret = LTTCOMM_FATAL; + goto end; + } + + get_traces_per_session(current_session, (struct lttng_trace *)(send_buf + header_size)); + break; + } case UST_CREATE_TRACE: { ret = ust_create_trace(lsm->pid); if (ret < 0) { - ret = LTTCOMM_CREATE_FAIL; + /* If -1 is returned from ust_create_trace, malloc + * failed so it's pretty much a fatal error. + */ + ret = LTTCOMM_FATAL; goto end; } @@ -555,24 +574,39 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) } case UST_LIST_APPS: { + unsigned int app_count = get_app_count(); /* Stop right now if no apps */ - if (traceable_app_count == 0) { + 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) * traceable_app_count, &llm); + sizeof(pid_t) * app_count, &llm); if (buf_size < 0) { ret = LTTCOMM_FATAL; goto end; } - get_list_apps((pid_t *)(send_buf + header_size)); + get_app_list_pids((pid_t *)(send_buf + header_size)); break; } + case UST_START_TRACE: + { + ret = ust_start_trace(lsm->pid); + + /* No auxiliary data so only send the llm struct. */ + goto end; + } + case UST_STOP_TRACE: + { + ret = ust_stop_trace(lsm->pid); + + /* No auxiliary data so only send the llm struct. */ + goto end; + } case LTTNG_LIST_SESSIONS: { unsigned int session_count = get_session_count(); @@ -633,6 +667,7 @@ static void usage(void) 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"); } /* @@ -651,12 +686,13 @@ static int parse_args(int argc, char **argv) { "group", 1, 0, 'g' }, { "version", 0, 0, 'V' }, { "quiet", 0, 0, 'q' }, + { "verbose", 0, 0, 'v' }, { NULL, 0, 0, 0 } }; while (1) { int option_index = 0; - c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); + c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:", long_options, &option_index); if (c == -1) { break; } @@ -692,6 +728,9 @@ static int parse_args(int argc, char **argv) case 'q': opt_quiet = 1; break; + case 'v': + opt_verbose = 1; + break; default: /* Unknown option or other error. * Error is printed by getopt, just return */ @@ -706,8 +745,8 @@ static int parse_args(int argc, char **argv) * 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_socket - The communication socket for all UST apps. + * client_socket - The communication of the cli tool (lttng). */ static int init_daemon_socket() { @@ -753,7 +792,7 @@ end: * check_existing_daemon * * Check if the global socket is available. - * If yes, error is returned. + * If yes, error is returned. */ static int check_existing_daemon() { @@ -768,12 +807,12 @@ static int check_existing_daemon() } /* - * get_home_dir + * get_home_dir * - * Return pointer to home directory path using - * the env variable HOME. + * Return pointer to home directory path using + * the env variable HOME. * - * Default : /tmp + * Default : /tmp */ static const char *get_home_dir(void) { @@ -812,14 +851,16 @@ static int set_socket_perms(void) perror("chown"); } + DBG("Sockets permissions set"); + end: return ret; } /* - * set_signal_handler + * set_signal_handler * - * Setup signal handler for : + * Setup signal handler for : * SIGINT, SIGTERM, SIGPIPE */ static int set_signal_handler(void) @@ -851,21 +892,28 @@ static int set_signal_handler(void) return ret; } + DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); + return ret; } /** - * sighandler + * sighandler * - * Signal handler for the daemon + * 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: @@ -876,12 +924,14 @@ static void sighandler(int sig) } /* - * cleanup + * cleanup * - * Cleanup the daemon on exit + * Cleanup the daemon on exit */ static void cleanup() { + DBG("Cleaning up"); + /* */ 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);