Init the kconsumerd error socket
[lttng-tools.git] / liblttngctl / lttngctl.c
index ec01859a9aa00b3394f6bfe29ac89abbfb976ae6..b64ace2e6d80de0ce085791f698604e53f8eb523 100644 (file)
  */
 
 #define _GNU_SOURCE
-#include <errno.h>
 #include <grp.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
+#include <lttng-sessiond-comm.h>
+#include <lttng-share.h>
 #include <lttng/lttng.h>
-
-#include <lttng/lttng-sessiond-comm.h>
-#include "lttngerr.h"
-#include "lttng-share.h"
+#include <lttngerr.h>
 
 /* Socket to session daemon for communication */
 static int sessiond_socket;
 static char sessiond_sock_path[PATH_MAX];
 
-/* Communication structure to ltt-sessiond */
-static struct lttcomm_session_msg lsm;
-static struct lttcomm_lttng_msg llm;
-
 /* Variables */
 static char *tracing_group;
 static int connected;
@@ -55,18 +50,41 @@ static void copy_string(char *dst, const char *src, size_t len)
                strncpy(dst, src, len);
                /* Enforce the NULL terminated byte */
                dst[len - 1] = '\0';
+       } else if (dst) {
+               dst[0] = '\0';
        }
 }
 
 /*
- *  send_data_sessiond
+ * Copy domain to lttcomm_session_msg domain.
  *
- *  Send lttcomm_session_msg to the session daemon.
+ * If domain is unknown, default domain will be the kernel.
+ */
+static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src)
+{
+       if (src && dst) {
+               switch (src->type) {
+                       case LTTNG_DOMAIN_KERNEL:
+                       case LTTNG_DOMAIN_UST:
+                       case LTTNG_DOMAIN_UST_EXEC_NAME:
+                       case LTTNG_DOMAIN_UST_PID:
+                       case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+                               memcpy(dst, src, sizeof(struct lttng_domain));
+                               break;
+                       default:
+                               dst->type = LTTNG_DOMAIN_KERNEL;
+                               break;
+               }
+       }
+}
+
+/*
+ * Send lttcomm_session_msg to the session daemon.
  *
- *  On success, return 0
- *  On error, return error code
+ * On success, return 0
+ * On error, return error code
  */
-static int send_data_sessiond(void)
+static int send_session_msg(struct lttcomm_session_msg *lsm)
 {
        int ret;
 
@@ -75,19 +93,18 @@ static int send_data_sessiond(void)
                goto end;
        }
 
-       ret = lttcomm_send_unix_sock(sessiond_socket, &lsm, sizeof(lsm));
+       ret = lttcomm_send_unix_sock(sessiond_socket, lsm,
+                       sizeof(struct lttcomm_session_msg));
 
 end:
        return ret;
 }
 
 /*
- *  recv_data_sessiond
+ * Receive data from the sessiond socket.
  *
- *  Receive data from the sessiond socket.
- *
- *  On success, return 0
- *  On error, return recv() error code
+ * On success, return 0
+ * On error, return recv() error code
  */
 static int recv_data_sessiond(void *buf, size_t len)
 {
@@ -107,7 +124,7 @@ end:
 /*
  *  Check if the specified group name exist.
  *
- *  If yes return 0, else return -1.
+ *  If yes return 1, else return -1.
  */
 static int check_tracing_group(const char *grp_name)
 {
@@ -143,7 +160,7 @@ static int check_tracing_group(const char *grp_name)
 
        for (i = 0; i < grp_list_size; i++) {
                if (grp_list[i] == grp_tracing->gr_gid) {
-                       ret = 0;
+                       ret = 1;
                        break;
                }
        }
@@ -156,24 +173,79 @@ end:
 }
 
 /*
- *  Set sessiond socket path by putting it in the global sessiond_sock_path
- *  variable.
+ * Try connect to session daemon with sock_path.
+ *
+ * Return 0 on success, else -1
  */
-static int set_session_daemon_path(void)
+static int try_connect_sessiond(const char *sock_path)
 {
        int ret;
 
-       /* Are we in the tracing group ? */
-       ret = check_tracing_group(tracing_group);
-       if (ret < 0 && getuid() != 0) {
+       /* If socket exist, we check if the daemon listens for connect. */
+       ret = access(sock_path, F_OK);
+       if (ret < 0) {
+               /* Not alive */
+               return -1;
+       }
+
+       ret = lttcomm_connect_unix_sock(sock_path);
+       if (ret < 0) {
+               /* Not alive */
+               return -1;
+       }
+
+       ret = lttcomm_close_unix_sock(ret);
+       if (ret < 0) {
+               perror("lttcomm_close_unix_sock");
+       }
+
+       return 0;
+}
+
+/*
+ * Set sessiond socket path by putting it in the global sessiond_sock_path
+ * variable.
+ */
+static int set_session_daemon_path(void)
+{
+       int ret;
+       int in_tgroup = 0;      /* In tracing group */
+       uid_t uid;
+
+       uid = getuid();
+
+       if (uid != 0) {
+               /* Are we in the tracing group ? */
+               in_tgroup = check_tracing_group(tracing_group);
+       }
+
+       if (uid == 0) {
+               /* Root */
+               copy_string(sessiond_sock_path,
+                               DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+                               sizeof(sessiond_sock_path));
+       } else if (in_tgroup) {
+               /* Tracing group */
+               copy_string(sessiond_sock_path,
+                               DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+                               sizeof(sessiond_sock_path));
+
+               ret = try_connect_sessiond(sessiond_sock_path);
+               if (ret < 0) {
+                       /* Global session daemon not available */
+                       if (snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
+                                               DEFAULT_HOME_CLIENT_UNIX_SOCK,
+                                               getenv("HOME")) < 0) {
+                               return -ENOMEM;
+                       }
+               }
+       } else {
+               /* Not in tracing group and not root, default */
                if (snprintf(sessiond_sock_path, PATH_MAX,
-                            DEFAULT_HOME_CLIENT_UNIX_SOCK,
-                            getenv("HOME")) < 0) {
+                                       DEFAULT_HOME_CLIENT_UNIX_SOCK,
+                                       getenv("HOME")) < 0) {
                        return -ENOMEM;
                }
-       } else {
-               copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
-                           PATH_MAX);
        }
 
        return 0;
@@ -222,35 +294,24 @@ static int disconnect_sessiond(void)
 }
 
 /*
- * Reset the session message structure.
- */
-static void reset_session_msg(void)
-{
-       memset(&lsm, 0, sizeof(struct lttcomm_session_msg));
-}
-
-/*
- *  ask_sessiond
- *
- *  Ask the session daemon a specific command and put the data into buf.
+ * Ask the session daemon a specific command and put the data into buf.
  *
- *  Return size of data (only payload, not header).
+ * Return size of data (only payload, not header).
  */
-static int ask_sessiond(enum lttcomm_sessiond_command lct, void **buf)
+static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
 {
        int ret;
        size_t size;
        void *data = NULL;
+       struct lttcomm_lttng_msg llm;
 
        ret = connect_sessiond();
        if (ret < 0) {
                goto end;
        }
 
-       lsm.cmd_type = lct;
-
        /* Send command to session daemon */
-       ret = send_data_sessiond();
+       ret = send_session_msg(lsm);
        if (ret < 0) {
                goto end;
        }
@@ -282,149 +343,263 @@ static int ask_sessiond(enum lttcomm_sessiond_command lct, void **buf)
                goto end;
        }
 
+       /*
+        * Extra protection not to dereference a NULL pointer. If buf is NULL at
+        * this point, an error is returned and data is freed.
+        */
+       if (buf == NULL) {
+               ret = -1;
+               free(data);
+               goto end;
+       }
+
        *buf = data;
        ret = size;
 
 end:
        disconnect_sessiond();
-       reset_session_msg();
        return ret;
 }
 
 /*
- * Copy domain to lttcomm_session_msg domain. If unknown domain, default domain
- * will be the kernel.
+ * Create lttng handle and return pointer.
  */
-static void copy_lttng_domain(struct lttng_domain *dom)
+struct lttng_handle *lttng_create_handle(const char *session_name,
+               struct lttng_domain *domain)
 {
-       if (dom) {
-               switch (dom->type) {
-               case LTTNG_DOMAIN_KERNEL:
-               case LTTNG_DOMAIN_UST:
-               case LTTNG_DOMAIN_UST_EXEC_NAME:
-               case LTTNG_DOMAIN_UST_PID:
-               case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-                       memcpy(&lsm.domain, dom, sizeof(struct lttng_domain));
-                       break;
-               default:
-                       lsm.domain.type = LTTNG_DOMAIN_KERNEL;
-                       break;
-               }
+       struct lttng_handle *handle;
+
+       handle = malloc(sizeof(struct lttng_handle));
+       if (handle == NULL) {
+               perror("malloc handle");
+               goto end;
        }
+
+       /* Copy session name */
+       copy_string(handle->session_name, session_name,
+                       sizeof(handle->session_name));
+
+       /* Copy lttng domain */
+       copy_lttng_domain(&handle->domain, domain);
+
+end:
+       return handle;
+}
+
+/*
+ * Destroy handle by free(3) the pointer.
+ */
+void lttng_destroy_handle(struct lttng_handle *handle)
+{
+       if (handle) {
+               free(handle);
+       }
+}
+
+/*
+ * Register an outside consumer.
+ */
+int lttng_register_consumer(struct lttng_handle *handle,
+               const char *socket_path)
+{
+       struct lttcomm_session_msg lsm;
+
+       lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+       copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  *  Start tracing for all trace of the session.
  */
-int lttng_start_tracing(const char *session_name)
+int lttng_start_tracing(struct lttng_handle *handle)
 {
-       copy_string(lsm.session.name, session_name, NAME_MAX);
-       return ask_sessiond(LTTNG_START_TRACE, NULL);
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
+
+       lsm.cmd_type = LTTNG_START_TRACE;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  *  Stop tracing for all trace of the session.
  */
-int lttng_stop_tracing(const char *session_name)
+int lttng_stop_tracing(struct lttng_handle *handle)
 {
-       copy_string(lsm.session.name, session_name, NAME_MAX);
-       return ask_sessiond(LTTNG_STOP_TRACE, NULL);
+       struct lttcomm_session_msg lsm;
+
+       lsm.cmd_type = LTTNG_STOP_TRACE;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
- *  lttng_add_context
+ * Add context to event or/and channel.
  */
-int lttng_add_context(struct lttng_domain *domain,
+int lttng_add_context(struct lttng_handle *handle,
                struct lttng_event_context *ctx, const char *event_name,
                const char *channel_name)
 {
-       copy_string(lsm.u.context.channel_name, channel_name, NAME_MAX);
-       copy_string(lsm.u.context.event_name, event_name, NAME_MAX);
-       copy_lttng_domain(domain);
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
+
+       lsm.cmd_type = LTTNG_ADD_CONTEXT;
+
+       /* Copy channel name */
+       copy_string(lsm.u.context.channel_name, channel_name,
+                       sizeof(lsm.u.context.channel_name));
+       /* Copy event name */
+       copy_string(lsm.u.context.event_name, event_name,
+                       sizeof(lsm.u.context.event_name));
+
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
        if (ctx) {
                memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
        }
 
-       return ask_sessiond(LTTNG_ADD_CONTEXT, NULL);
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
- *  lttng_enable_event
+ * Enable event
  */
-int lttng_enable_event(struct lttng_domain *domain,
+int lttng_enable_event(struct lttng_handle *handle,
                struct lttng_event *ev, const char *channel_name)
 {
-       int ret;
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
 
        if (channel_name == NULL) {
-               copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
+               copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
+                               sizeof(lsm.u.enable.channel_name));
        } else {
-               copy_string(lsm.u.enable.channel_name, channel_name, NAME_MAX);
+               copy_string(lsm.u.enable.channel_name, channel_name,
+                               sizeof(lsm.u.enable.channel_name));
        }
 
-       copy_lttng_domain(domain);
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
-       if (ev == NULL) {
-               ret = ask_sessiond(LTTNG_ENABLE_ALL_EVENT, NULL);
+       if (ev) {
+               lsm.cmd_type = LTTNG_ENABLE_EVENT;
+               memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
        } else {
-               memcpy(&lsm.u.enable.event, ev, sizeof(struct lttng_event));
-               ret = ask_sessiond(LTTNG_ENABLE_EVENT, NULL);
+               lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
        }
 
-       return ret;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  * Disable event of a channel and domain.
  */
-int lttng_disable_event(struct lttng_domain *domain, const char *name,
+int lttng_disable_event(struct lttng_handle *handle, const char *name,
                const char *channel_name)
 {
-       int ret = -1;
+       struct lttcomm_session_msg lsm;
 
-       if (channel_name == NULL) {
-               copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
+       if (!handle) {
+               return -1;
+       }
+
+       if (channel_name) {
+               copy_string(lsm.u.disable.channel_name, channel_name,
+                               sizeof(lsm.u.disable.channel_name));
        } else {
-               copy_string(lsm.u.disable.channel_name, channel_name, NAME_MAX);
+               copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME,
+                               sizeof(lsm.u.disable.channel_name));
        }
 
-       copy_lttng_domain(domain);
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
        if (name == NULL) {
-               ret = ask_sessiond(LTTNG_DISABLE_ALL_EVENT, NULL);
+               copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
+               lsm.cmd_type = LTTNG_DISABLE_EVENT;
        } else {
-               copy_string(lsm.u.disable.name, name, NAME_MAX);
-               ret = ask_sessiond(LTTNG_DISABLE_EVENT, NULL);
+               lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT;
        }
 
-       return ret;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  * Enable channel per domain
  */
-int lttng_enable_channel(struct lttng_domain *domain,
+int lttng_enable_channel(struct lttng_handle *handle,
                struct lttng_channel *chan)
 {
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
+
        if (chan) {
-               memcpy(&lsm.u.channel.chan, chan, sizeof(struct lttng_channel));
+               memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
        }
 
-       copy_lttng_domain(domain);
+       lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+
+       copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
 
-       return ask_sessiond(LTTNG_ENABLE_CHANNEL, NULL);
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  * All tracing will be stopped for registered events of the channel.
  */
-int lttng_disable_channel(struct lttng_domain *domain, const char *name)
+int lttng_disable_channel(struct lttng_handle *handle, const char *name)
 {
-       copy_string(lsm.u.disable.channel_name, name, NAME_MAX);
-       copy_lttng_domain(domain);
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
+
+       if (name) {
+               copy_string(lsm.u.disable.channel_name, name,
+                               sizeof(lsm.u.disable.channel_name));
+       }
+
+       lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
+
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
-       return ask_sessiond(LTTNG_DISABLE_CHANNEL, NULL);
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
@@ -433,14 +608,20 @@ int lttng_disable_channel(struct lttng_domain *domain, const char *name)
  * Return the size (bytes) of the list and set the events array.
  * On error, return negative value.
  */
-int lttng_list_tracepoints(struct lttng_domain *domain,
+int lttng_list_tracepoints(struct lttng_handle *handle,
                struct lttng_event **events)
 {
        int ret;
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
 
-       copy_lttng_domain(domain);
+       lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
-       ret = ask_sessiond(LTTNG_LIST_TRACEPOINTS, (void **) events);
+       ret = ask_sessiond(&lsm, (void **) events);
        if (ret < 0) {
                return ret;
        }
@@ -465,18 +646,31 @@ const char *lttng_get_readable_code(int code)
  */
 int lttng_create_session(const char *name, const char *path)
 {
-       copy_string(lsm.session.name, name, NAME_MAX);
-       copy_string(lsm.session.path, path, PATH_MAX);
-       return ask_sessiond(LTTNG_CREATE_SESSION, NULL);
+       struct lttcomm_session_msg lsm;
+
+       lsm.cmd_type = LTTNG_CREATE_SESSION;
+       copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+       copy_string(lsm.session.path, path, sizeof(lsm.session.path));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
  *  Destroy session using name.
  */
-int lttng_destroy_session(const char *name)
+int lttng_destroy_session(struct lttng_handle *handle)
 {
-       copy_string(lsm.session.name, name, NAME_MAX);
-       return ask_sessiond(LTTNG_DESTROY_SESSION, NULL);
+       struct lttcomm_session_msg lsm;
+
+       if (!handle) {
+               return -1;
+       }
+
+       lsm.cmd_type = LTTNG_DESTROY_SESSION;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
@@ -488,8 +682,10 @@ int lttng_destroy_session(const char *name)
 int lttng_list_sessions(struct lttng_session **sessions)
 {
        int ret;
+       struct lttcomm_session_msg lsm;
 
-       ret = ask_sessiond(LTTNG_LIST_SESSIONS, (void**) sessions);
+       lsm.cmd_type = LTTNG_LIST_SESSIONS;
+       ret = ask_sessiond(&lsm, (void**) sessions);
        if (ret < 0) {
                return ret;
        }
@@ -500,12 +696,22 @@ int lttng_list_sessions(struct lttng_session **sessions)
 /*
  * List domain of a session.
  */
-int lttng_list_domains(const char *session_name, struct lttng_domain **domains)
+int lttng_list_domains(struct lttng_handle *handle,
+               struct lttng_domain **domains)
 {
        int ret;
+       struct lttcomm_session_msg lsm;
 
-       copy_string(lsm.session.name, session_name, NAME_MAX);
-       ret = ask_sessiond(LTTNG_LIST_DOMAINS, (void**) domains);
+       if (!handle) {
+               return -1;
+       }
+
+       lsm.cmd_type = LTTNG_LIST_DOMAINS;
+
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       ret = ask_sessiond(&lsm, (void**) domains);
        if (ret < 0) {
                return ret;
        }
@@ -516,15 +722,23 @@ int lttng_list_domains(const char *session_name, struct lttng_domain **domains)
 /*
  * List channels of a session
  */
-int lttng_list_channels(struct lttng_domain *domain,
-               const char *session_name, struct lttng_channel **channels)
+int lttng_list_channels(struct lttng_handle *handle,
+               struct lttng_channel **channels)
 {
        int ret;
+       struct lttcomm_session_msg lsm;
 
-       copy_string(lsm.session.name, session_name, NAME_MAX);
-       copy_lttng_domain(domain);
+       if (!handle) {
+               return -1;
+       }
 
-       ret = ask_sessiond(LTTNG_LIST_CHANNELS, (void**) channels);
+       lsm.cmd_type = LTTNG_LIST_CHANNELS;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       ret = ask_sessiond(&lsm, (void**) channels);
        if (ret < 0) {
                return ret;
        }
@@ -535,17 +749,25 @@ int lttng_list_channels(struct lttng_domain *domain,
 /*
  * List events of a session channel.
  */
-int lttng_list_events(struct lttng_domain *domain,
-               const char *session_name, const char *channel_name,
-               struct lttng_event **events)
+int lttng_list_events(struct lttng_handle *handle,
+               const char *channel_name, struct lttng_event **events)
 {
        int ret;
+       struct lttcomm_session_msg lsm;
 
-       copy_string(lsm.session.name, session_name, NAME_MAX);
-       copy_string(lsm.u.list.channel_name, channel_name, NAME_MAX);
-       copy_lttng_domain(domain);
+       if (!handle) {
+               return -1;
+       }
 
-       ret = ask_sessiond(LTTNG_LIST_EVENTS, (void**) events);
+       lsm.cmd_type = LTTNG_LIST_EVENTS;
+       copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+       copy_string(lsm.u.list.channel_name, channel_name,
+                       sizeof(lsm.u.list.channel_name));
+
+       copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       ret = ask_sessiond(&lsm, (void**) events);
        if (ret < 0) {
                return ret;
        }
@@ -553,14 +775,6 @@ int lttng_list_events(struct lttng_domain *domain,
        return ret / sizeof(struct lttng_event);
 }
 
-/*
- * Set session name for the current lsm.
- */
-void lttng_set_session_name(const char *name)
-{
-       copy_string(lsm.session.name, name, NAME_MAX);
-}
-
 /*
  *  lttng_set_tracing_group
  *
@@ -579,25 +793,28 @@ int lttng_set_tracing_group(const char *name)
 /*
  *  lttng_calibrate
  */
-int lttng_calibrate(struct lttng_domain *domain,
+int lttng_calibrate(struct lttng_handle *handle,
                struct lttng_calibrate *calibrate)
 {
-       int ret;
+       struct lttcomm_session_msg lsm;
 
-       copy_lttng_domain(domain);
+       if (!handle) {
+               return -1;
+       }
 
-       memcpy(&lsm.u.calibrate, calibrate, sizeof(struct lttng_calibrate));
-       ret = ask_sessiond(LTTNG_CALIBRATE, NULL);
+       lsm.cmd_type = LTTNG_CALIBRATE;
+       copy_lttng_domain(&lsm.domain, &handle->domain);
 
-       return ret;
+       memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate));
+
+       return ask_sessiond(&lsm, NULL);
 }
 
 /*
- *  lttng_check_session_daemon
+ * Check if session daemon is alive.
  *
- *  Yes, return 1
- *  No, return 0
- *  Error, return negative value
+ * Return 1 if alive or 0 if not.
+ * On error return -1
  */
 int lttng_session_daemon_alive(void)
 {
@@ -609,21 +826,16 @@ int lttng_session_daemon_alive(void)
                return ret;
        }
 
-       /* If socket exist, we check if the daemon listens to connect. */
-       ret = access(sessiond_sock_path, F_OK);
-       if (ret < 0) {
-               /* Not alive */
-               return 0;
+       if (strlen(sessiond_sock_path) == 0) {
+               /* No socket path set. Weird error */
+               return -1;
        }
 
-       ret = lttcomm_connect_unix_sock(sessiond_sock_path);
+       ret = try_connect_sessiond(sessiond_sock_path);
        if (ret < 0) {
                /* Not alive */
                return 0;
        }
-       ret = lttcomm_close_unix_sock(ret);
-       if (ret < 0)
-               perror("lttcomm_close_unix_sock");
 
        /* Is alive */
        return 1;
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