From: David Goulet Date: Fri, 6 May 2011 15:58:31 +0000 (-0400) Subject: Move ust trace actions to trace.c X-Git-Tag: v2.0-pre1~144 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=471d16937e160d99382c633db37d89605f483556;p=lttng-tools.git Move ust trace actions to trace.c Move from main.c to trace.c all UST specific trace actions. Now, if we get a pid from the lttng client, we try to connect before dealing with the commands. Move current_session to an extern declaration in session.h. Signed-off-by: David Goulet --- diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c index 90aea69fc..f5431bc0a 100644 --- a/ltt-sessiond/main.c +++ b/ltt-sessiond/main.c @@ -52,7 +52,7 @@ 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 ust_connect_app(pid_t pid); static int init_daemon_socket(void); static int notify_apps(const char* name); static int process_client_msg(int sock, struct lttcomm_session_msg*); @@ -89,7 +89,8 @@ static int client_sock; static int apps_sock; static int kconsumerd_err_sock; -static struct ltt_session *current_session; +/* Extern in session.h */ +struct ltt_session *current_session; /* * thread_manage_kconsumerd @@ -264,7 +265,7 @@ static int send_unix_sock(int sock, void *buf, size_t len) } /* - * connect_app + * ust_connect_app * * Return a socket connected to the libust communication socket * of the application identified by the pid. @@ -272,7 +273,7 @@ static int send_unix_sock(int sock, void *buf, size_t len) * 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; @@ -326,131 +327,6 @@ error: return ret; } -/* - * ust_create_trace - * - * Create an userspace trace using pid. - * This trace is then appended to the current session - * ust trace list. - */ -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"); - ret = -1; - goto error; - } - - /* 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); - if (sock < 0) { - ret = LTTCOMM_NO_TRACEABLE; - goto error; - } - - ret = ustctl_create_trace(sock, trace->name); - if (ret < 0) { - ret = LTTCOMM_CREATE_FAIL; - goto error; - } - - /* Check if current session is valid */ - if (current_session) { - cds_list_add(&trace->list, ¤t_session->ust_traces); - current_session->ust_trace_count++; - } - -error: - return ret; -} - -/* - * ust_start_trace - * - * Start a trace. This trace, identified by the pid, must be - * in the current session ust_traces list. - */ -static int ust_start_trace(pid_t pid) -{ - int sock, ret; - struct ltt_ust_trace *trace; - - 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; - } - - 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; -} - /* * copy_common_data * @@ -514,8 +390,7 @@ error: */ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) { - int ret; - int buf_size; + int ust_sock, ret, buf_size; size_t header_size; char *send_buf = NULL; struct lttcomm_lttng_header llh; @@ -546,6 +421,16 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) header_size = sizeof(struct lttcomm_lttng_header); + /* Connect to ust apps if available pid */ + if (lsm->pid != 0) { + /* Connect to app using ustctl API */ + ust_sock = ust_connect_app(lsm->pid); + if (ust_sock < 0) { + ret = LTTCOMM_NO_TRACEABLE; + goto end; + } + } + /* Process by command type */ switch (lsm->cmd_type) { case LTTNG_CREATE_SESSION: @@ -601,7 +486,7 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) } case UST_CREATE_TRACE: { - ret = ust_create_trace(lsm->pid); + ret = ust_create_trace(ust_sock, lsm->pid); if (ret < 0) { /* If -1 is returned from ust_create_trace, malloc * failed so it's pretty much a fatal error. @@ -636,14 +521,14 @@ static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) } case UST_START_TRACE: { - ret = ust_start_trace(lsm->pid); + ret = ust_start_trace(ust_sock, lsm->pid); /* No auxiliary data so only send the llh struct. */ goto end; } case UST_STOP_TRACE: { - ret = ust_stop_trace(lsm->pid); + ret = ust_stop_trace(ust_sock, lsm->pid); /* No auxiliary data so only send the llh struct. */ goto end; diff --git a/ltt-sessiond/session.h b/ltt-sessiond/session.h index 4f58e9d9f..96ecc217e 100644 --- a/ltt-sessiond/session.h +++ b/ltt-sessiond/session.h @@ -22,6 +22,8 @@ #include #include +extern struct ltt_session *current_session; + /* Global session list */ struct ltt_session_list { struct cds_list_head head; diff --git a/ltt-sessiond/trace.c b/ltt-sessiond/trace.c index c5d700fd1..a9ede93eb 100644 --- a/ltt-sessiond/trace.c +++ b/ltt-sessiond/trace.c @@ -23,18 +23,24 @@ #include #include #include +#include +#include "liblttsessiondcomm.h" #include "lttngerr.h" #include "trace.h" #include "session.h" +static struct ltt_ust_trace *find_session_ust_trace_by_pid( + struct ltt_session *session, pid_t pid); + /* * find_session_ust_trace_by_pid * * Iterate over the session ust_traces and * return a pointer or NULL if not found. */ -struct ltt_ust_trace *find_session_ust_trace_by_pid(struct ltt_session *session, pid_t pid) +static struct ltt_ust_trace *find_session_ust_trace_by_pid( + struct ltt_session *session, pid_t pid) { struct ltt_ust_trace *iter; @@ -97,3 +103,108 @@ void get_traces_per_session(struct ltt_session *session, struct lttng_trace *tra i++; } } + +/* + * ust_create_trace + * + * Create an userspace trace using pid. + * This trace is then appended to the current session + * ust trace list. + */ +int ust_create_trace(int sock, pid_t pid) +{ + int 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"); + ret = -1; + goto error; + } + + /* 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"); + + ret = ustctl_create_trace(sock, trace->name); + if (ret < 0) { + ret = LTTCOMM_CREATE_FAIL; + goto error; + } + + /* Check if current session is valid */ + if (current_session) { + cds_list_add(&trace->list, ¤t_session->ust_traces); + current_session->ust_trace_count++; + } + +error: + return ret; +} + +/* + * ust_start_trace + * + * Start a trace. This trace, identified by the pid, must be + * in the current session ust_traces list. + */ +int ust_start_trace(int sock, pid_t pid) +{ + int ret; + struct ltt_ust_trace *trace; + + 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; + } + + 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. + */ +int ust_stop_trace(int sock, pid_t pid) +{ + int 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; + } + + ret = ustctl_stop_trace(sock, trace->name); + if (ret < 0) { + ret = LTTCOMM_STOP_FAIL; + goto error; + } + +error: + return ret; +} + diff --git a/ltt-sessiond/trace.h b/ltt-sessiond/trace.h index 755f8dfdf..a7eadcbc8 100644 --- a/ltt-sessiond/trace.h +++ b/ltt-sessiond/trace.h @@ -43,8 +43,10 @@ struct ltt_ust_marker { char *channel; }; -struct ltt_ust_trace *find_session_ust_trace_by_pid(struct ltt_session *session, pid_t pid); int get_trace_count_per_session(struct ltt_session *session); void get_traces_per_session(struct ltt_session *session, struct lttng_trace *traces); +int ust_create_trace(int sock, pid_t pid); +int ust_start_trace(int sock, pid_t pid); +int ust_stop_trace(int sock, pid_t pid); #endif /* _LTT_TRACE_H */