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91d76f53 DG |
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 | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
91d76f53 DG |
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 | #define _GNU_SOURCE | |
20 | #include <errno.h> | |
21 | #include <pthread.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd DG |
24 | #include <string.h> |
25 | #include <unistd.h> | |
91d76f53 | 26 | |
1e307fab DG |
27 | #include <lttngerr.h> |
28 | ||
91d76f53 DG |
29 | #include "traceable-app.h" |
30 | ||
91d76f53 | 31 | /* Init ust traceabl application's list */ |
099e26bd | 32 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
91d76f53 | 33 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), |
099e26bd DG |
34 | .lock = PTHREAD_MUTEX_INITIALIZER, |
35 | .count = 0, | |
91d76f53 DG |
36 | }; |
37 | ||
91d76f53 | 38 | /* |
099e26bd | 39 | * Add a traceable application structure to the global list. |
91d76f53 DG |
40 | */ |
41 | static void add_traceable_app(struct ltt_traceable_app *lta) | |
42 | { | |
91d76f53 | 43 | cds_list_add(<a->list, <t_traceable_app_list.head); |
099e26bd | 44 | ltt_traceable_app_list.count++; |
91d76f53 DG |
45 | } |
46 | ||
47 | /* | |
099e26bd | 48 | * Delete a traceable application structure from the global list. |
91d76f53 DG |
49 | */ |
50 | static void del_traceable_app(struct ltt_traceable_app *lta) | |
51 | { | |
91d76f53 DG |
52 | cds_list_del(<a->list); |
53 | /* Sanity check */ | |
099e26bd DG |
54 | if (ltt_traceable_app_list.count > 0) { |
55 | ltt_traceable_app_list.count--; | |
56 | } | |
57 | } | |
58 | ||
59 | /* | |
60 | * Return pointer to traceable apps list. | |
61 | */ | |
62 | struct ltt_traceable_app_list *get_traceable_apps_list(void) | |
63 | { | |
64 | return <t_traceable_app_list; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Acquire traceable apps list lock. | |
69 | */ | |
70 | void lock_apps_list(void) | |
71 | { | |
72 | pthread_mutex_lock(<t_traceable_app_list.lock); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Release traceable apps list lock. | |
77 | */ | |
78 | void unlock_apps_list(void) | |
79 | { | |
80 | pthread_mutex_unlock(<t_traceable_app_list.lock); | |
81 | } | |
82 | ||
83 | /* | |
84 | * Iterate over the traceable apps list and return a pointer or NULL if not | |
85 | * found. | |
86 | */ | |
87 | static struct ltt_traceable_app *find_app_by_sock(int sock) | |
88 | { | |
89 | struct ltt_traceable_app *iter; | |
90 | ||
91 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
92 | if (iter->sock == sock) { | |
93 | /* Found */ | |
94 | return iter; | |
95 | } | |
91d76f53 | 96 | } |
099e26bd DG |
97 | |
98 | return NULL; | |
91d76f53 DG |
99 | } |
100 | ||
0177d773 DG |
101 | /* |
102 | * Iterate over the traceable apps list and return a pointer or NULL if not | |
103 | * found. | |
104 | */ | |
105 | struct ltt_traceable_app *traceable_app_get_by_pid(pid_t pid) | |
106 | { | |
107 | struct ltt_traceable_app *iter; | |
108 | ||
109 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
110 | if (iter->pid == pid) { | |
111 | /* Found */ | |
112 | return iter; | |
113 | } | |
114 | } | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
91d76f53 | 119 | /* |
050349bb DG |
120 | * Using pid and uid (of the app), allocate a new ltt_traceable_app struct and |
121 | * add it to the global traceable app list. | |
91d76f53 | 122 | * |
050349bb | 123 | * On success, return 0, else return malloc ENOMEM. |
91d76f53 | 124 | */ |
099e26bd | 125 | int register_traceable_app(struct ust_register_msg *msg, int sock) |
91d76f53 DG |
126 | { |
127 | struct ltt_traceable_app *lta; | |
128 | ||
129 | lta = malloc(sizeof(struct ltt_traceable_app)); | |
130 | if (lta == NULL) { | |
131 | perror("malloc"); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
099e26bd DG |
135 | lta->uid = msg->uid; |
136 | lta->gid = msg->gid; | |
137 | lta->pid = msg->pid; | |
138 | lta->ppid = msg->ppid; | |
139 | lta->v_major = msg->major; | |
140 | lta->v_minor = msg->minor; | |
141 | lta->sock = sock; | |
142 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
143 | lta->name[16] = '\0'; | |
144 | ||
145 | lock_apps_list(); | |
91d76f53 | 146 | add_traceable_app(lta); |
099e26bd DG |
147 | unlock_apps_list(); |
148 | ||
149 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" | |
150 | " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid, | |
151 | lta->sock, lta->name, lta->v_major, lta->v_minor); | |
91d76f53 DG |
152 | |
153 | return 0; | |
154 | } | |
155 | ||
156 | /* | |
050349bb DG |
157 | * Unregister app by removing it from the global traceable app list and freeing |
158 | * the data struct. | |
099e26bd DG |
159 | * |
160 | * The socket is already closed at this point so no close to sock. | |
91d76f53 | 161 | */ |
099e26bd | 162 | void unregister_traceable_app(int sock) |
91d76f53 DG |
163 | { |
164 | struct ltt_traceable_app *lta; | |
165 | ||
099e26bd DG |
166 | lock_apps_list(); |
167 | lta = find_app_by_sock(sock); | |
168 | if (lta) { | |
169 | DBG("PID %d unregistered with sock %d", lta->pid, sock); | |
170 | close(lta->sock); | |
91d76f53 DG |
171 | del_traceable_app(lta); |
172 | free(lta); | |
91d76f53 | 173 | } |
099e26bd | 174 | unlock_apps_list(); |
91d76f53 DG |
175 | } |
176 | ||
177 | /* | |
050349bb | 178 | * Return traceable_app_count |
91d76f53 DG |
179 | */ |
180 | unsigned int get_app_count(void) | |
181 | { | |
099e26bd | 182 | unsigned int count; |
91d76f53 | 183 | |
099e26bd DG |
184 | lock_apps_list(); |
185 | count = ltt_traceable_app_list.count; | |
186 | unlock_apps_list(); | |
91d76f53 | 187 | |
099e26bd | 188 | return count; |
91d76f53 DG |
189 | } |
190 | ||
191 | /* | |
099e26bd | 192 | * Free and clean all traceable apps of the global list. |
91d76f53 | 193 | */ |
099e26bd | 194 | void clean_traceable_apps_list(void) |
91d76f53 | 195 | { |
099e26bd | 196 | struct ltt_traceable_app *iter, *tmp; |
91d76f53 | 197 | |
099e26bd DG |
198 | /* |
199 | * Don't acquire list lock here. This function should be called from | |
200 | * cleanup() functions meaning that the program will exit. | |
91d76f53 | 201 | */ |
099e26bd DG |
202 | cds_list_for_each_entry_safe(iter, tmp, <t_traceable_app_list.head, list) { |
203 | close(iter->sock); | |
204 | free(iter); | |
91d76f53 | 205 | } |
91d76f53 | 206 | } |