lttng-sessiond/lttng-sessiond.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #ifndef _LTT_SESSIOND_H
  20 #define _LTT_SESSIOND_H
  21
  22 #define _LGPL_SOURCE
  23 #include <urcu.h>
  24 #include <urcu/wfqueue.h>
  25
  26 #include "ust-app.h"
  27
  28 #define DEFAULT_HOME_DIR            "/tmp"
  29 #define DEFAULT_UST_SOCK_DIR        DEFAULT_HOME_DIR "/ust-app-socks"
  30 #define DEFAULT_GLOBAL_APPS_PIPE    DEFAULT_UST_SOCK_DIR "/global"
  31 #define DEFAULT_TRACE_OUTPUT        DEFAULT_HOME_DIR "/lttng"
  32
  33 #define DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH   "/lttng-ust-apps-wait"
  34 #define DEFAULT_HOME_APPS_WAIT_SHM_PATH     "/lttng-ust-apps-wait-%u"
  35
  36 struct module_param {
  37         const char *name;
  38         int required;
  39 };
  40
  41 /* LTTng kernel tracer modules list */
  42 const struct module_param kernel_modules_list[] = {
  43         { "lttng-ftrace", 0 },
  44         { "lttng-kprobes", 0 },
  45         { "lttng-kretprobes", 0 },
  46         { "lib-ring-buffer", 1 },
  47         { "ltt-relay", 1 },
  48         { "ltt-ring-buffer-client-discard", 1 },
  49         { "ltt-ring-buffer-client-overwrite", 1 },
  50         { "ltt-ring-buffer-metadata-client", 1 },
  51         { "ltt-ring-buffer-client-mmap-discard", 1 },
  52         { "ltt-ring-buffer-client-mmap-overwrite", 1 },
  53         { "ltt-ring-buffer-metadata-mmap-client", 1 },
  54         { "lttng-probe-lttng", 1 },
  55         { "lttng-types", 0 },
  56         { "lttng-probe-block", 0 },
  57         { "lttng-probe-irq", 0 },
  58         { "lttng-probe-kvm", 0 },
  59         { "lttng-probe-sched", 0 },
  60 };
  61
  62 extern const char default_home_dir[],
  63         default_tracing_group[],
  64         default_ust_sock_dir[],
  65         default_global_apps_pipe[];
  66
  67 /*
  68  * This contains extra data needed for processing a command received by the
  69  * session daemon from the lttng client.
  70  */
  71 struct command_ctx {
  72         int ust_sock;
  73         unsigned int lttng_msg_size;
  74         struct ucred creds;
  75         struct ltt_session *session;
  76         struct lttcomm_lttng_msg *llm;
  77         struct lttcomm_session_msg *lsm;
  78 };
  79
  80 struct ust_command {
  81         int sock;
  82         struct ust_register_msg reg_msg;
  83         struct cds_wfq_node node;
  84 };
  85
  86 /*
  87  * Queue used to enqueue UST registration request (ust_commant) and protected
  88  * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
  89  */
  90 struct ust_cmd_queue {
  91         int32_t futex;
  92         struct cds_wfq_queue queue;
  93 };
  94
  95 #endif /* _LTT_SESSIOND_H */