ltt-sessiond/traceable-app.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 _TRACEABLE_APP_H
  20 #define _TRACEABLE_APP_H
  21
  22 #include <stdint.h>
  23 #include <urcu/list.h>
  24
  25 #include "trace-ust.h"
  26
  27 /*
  28  * Application registration data structure.
  29  */
  30 struct ust_register_msg {
  31         uint32_t major;
  32         uint32_t minor;
  33         pid_t pid;
  34         pid_t ppid;
  35         uid_t uid;
  36         gid_t gid;
  37         char name[16];
  38 };
  39
  40 /*
  41  * Traceable application list.
  42  */
  43 struct ltt_traceable_app_list {
  44         /*
  45          * This lock protects any read/write access to the list and count (which is
  46          * basically the list size). All public functions in traceable-app.c
  47          * acquire this lock and release it before returning. If none of those
  48          * functions are used, the lock MUST be acquired in order to iterate or/and
  49          * do any actions on that list.
  50          */
  51         pthread_mutex_t lock;
  52
  53         /*
  54          * Number of element in the list. The session list lock MUST be acquired if
  55          * this counter is used when iterating over the session list.
  56          */
  57         unsigned int count;
  58
  59         /* Linked list head */
  60         struct cds_list_head head;
  61 };
  62
  63 /* Registered traceable applications. Libust registers to the session daemon
  64  * and a linked list is kept of all running traceable app.
  65  */
  66 struct ltt_traceable_app {
  67         int sock;            /* Communication socket with the application */
  68         pid_t pid;
  69         pid_t ppid;
  70         uid_t uid;           /* User ID that owns the apps */
  71         gid_t gid;           /* Group ID that owns the apps */
  72         uint32_t v_major;    /* Verion major number */
  73         uint32_t v_minor;    /* Verion minor number */
  74         char name[17];       /* Process name (short) */
  75         struct ltt_ust_channel_list channels;
  76         struct cds_list_head list;
  77 };
  78
  79 int register_traceable_app(struct ust_register_msg *msg, int sock);
  80 void unregister_traceable_app(int sock);
  81 unsigned int get_app_count(void);
  82
  83 void lock_apps_list(void);
  84 void unlock_apps_list(void);
  85 void clean_traceable_apps_list(void);
  86 struct ltt_traceable_app_list *get_traceable_apps_list(void);
  87
  88 struct ltt_traceable_app *traceable_app_get_by_pid(pid_t pid);
  89
  90 #endif /* _TRACEABLE_APP_H */