Fix possible NULL pointer dereference
[lttng-tools.git] / lttng-sessiond / ust-app.h
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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
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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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
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19#ifndef _LTT_UST_APP_H
20#define _LTT_UST_APP_H
91d76f53 21
099e26bd 22#include <stdint.h>
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23#include <urcu/list.h>
24
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25#include "trace-ust.h"
26
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27/*
28 * Application registration data structure.
29 */
30struct 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
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40/*
41 * Global applications HT used by the session daemon.
42 */
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43struct cds_lfht *ust_app_ht;
44
45struct cds_lfht *ust_app_sock_key_map;
46
47struct ust_app_key {
48 pid_t pid;
49 int sock;
50 struct cds_lfht_node node;
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51};
52
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53struct ust_app_event {
54 int enabled;
55 int handle;
13161846 56 struct lttng_ust_object_data *obj;
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57 char name[LTTNG_UST_SYM_NAME_LEN];
58 struct cds_lfht *ctx;
59 struct cds_lfht_node node;
60};
61
62struct ust_app_channel {
63 int enabled;
64 int handle;
65 char name[LTTNG_UST_SYM_NAME_LEN];
66 struct lttng_ust_channel attr;
13161846 67 struct lttng_ust_object_data *obj;
5af2f756 68 struct ltt_ust_stream_list streams;
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69 struct cds_lfht *ctx;
70 struct cds_lfht *events;
71 struct cds_lfht_node node;
72};
73
74struct ust_app_session {
75 int enabled;
76 int handle; /* Used has unique identifier */
77 unsigned int uid;
78 struct ltt_ust_metadata *metadata;
13161846 79 struct lttng_ust_object_data *obj;
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80 struct cds_lfht *channels; /* Registered channels */
81 struct cds_lfht_node node;
82};
83
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84/*
85 * Registered traceable applications. Libust registers to the session daemon
050349bb 86 * and a linked list is kept of all running traceable app.
91d76f53 87 */
56fff090 88struct ust_app {
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89 pid_t ppid;
90 uid_t uid; /* User ID that owns the apps */
91 gid_t gid; /* Group ID that owns the apps */
92 uint32_t v_major; /* Verion major number */
93 uint32_t v_minor; /* Verion minor number */
94 char name[17]; /* Process name (short) */
48842b30 95 struct cds_lfht *sessions;
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96 struct cds_lfht_node node;
97 struct ust_app_key key;
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98};
99
74d0b642 100#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 101
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102int ust_app_register(struct ust_register_msg *msg, int sock);
103void ust_app_unregister(int sock);
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104int ust_app_add_channel(struct ltt_ust_session *usess,
105 struct ltt_ust_channel *uchan);
106int ust_app_add_event(struct ltt_ust_session *usess,
107 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
f6a9efaa 108unsigned long ust_app_list_count(void);
48842b30 109int ust_app_start_trace(struct ltt_ust_session *usess);
487cf67c 110void ust_app_global_update(struct ltt_ust_session *usess, int sock);
91d76f53 111
56fff090 112void ust_app_clean_list(void);
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113void ust_app_ht_alloc(void);
114struct cds_lfht *ust_app_get_ht(void);
115struct ust_app *ust_app_find_by_pid(pid_t pid);
44d3bd01 116
74d0b642 117#else /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 118
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119static inline
120int ust_app_start_trace(struct ltt_ust_session *usess)
121{
5cf5d0e7 122 return 0;
d974f197 123}
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124static inline
125int ust_app_register(struct ust_register_msg *msg, int sock)
126{
127 return -ENOSYS;
128}
129static inline
130void ust_app_unregister(int sock)
131{
132}
133static inline
134unsigned int ust_app_list_count(void)
135{
136 return 0;
137}
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138static inline
139void ust_app_lock_list(void)
140{
141}
142static inline
143void ust_app_unlock_list(void)
144{
145}
146static inline
147void ust_app_clean_list(void)
148{
149}
150static inline
151struct ust_app_list *ust_app_get_list(void)
152{
153 return NULL;
154}
155static inline
156struct ust_app *ust_app_get_by_pid(pid_t pid)
157{
158 return NULL;
159}
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160static inline
161int ust_app_add_channel(struct ltt_ust_session *usess,
162 struct ltt_ust_channel *uchan)
163{
164 return 0;
165}
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166static inline
167int ust_app_add_event(struct ltt_ust_session *usess,
168 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
169{
5cf5d0e7 170 return 0;
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171}
172static inline
173struct cds_lfht *ust_app_get_ht(void)
174{
175 return NULL;
176}
177static inline
178void ust_app_ht_alloc(void)
179{
180}
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181static inline
182void ust_app_global_update(struct ltt_ust_session *usess, int sock)
183{
184}
48842b30 185
74d0b642 186#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 187
f6a9efaa 188#endif /* _LTT_UST_APP_H */
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