Add ust create trace feature
[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.c
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; either version 2
7 * of the License, or (at your option) any later version.
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 <limits.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/socket.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <sys/un.h>
28 #include <unistd.h>
29
30 #include "liblttsessiondcomm.h"
31
32 /*
33 * Human readable error message.
34 */
35 static const char *lttcomm_readable_code[] = {
36 [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
37 [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
38 [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
39 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
40 [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
41 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
42 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESS) ] = "No session found",
43 [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
44 [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
45 };
46
47 /*
48 * lttcom_get_readable_code
49 *
50 * Return ptr to string representing a human readable
51 * error code from the lttcomm_return_code enum.
52 *
53 * These code MUST be negative in other to treat that
54 * as an error value.
55 */
56 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
57 {
58 int tmp_code = -code;
59
60 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
61 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
62 }
63
64 return "Unknown error code";
65 }
66
67 /*
68 * lttcomm_connect_unix_sock
69 *
70 * Connect to unix socket using the path name.
71 */
72 int lttcomm_connect_unix_sock(const char *pathname)
73 {
74 struct sockaddr_un sun;
75 int fd;
76 int ret = 1;
77
78 fd = socket(PF_UNIX, SOCK_STREAM, 0);
79 if (fd < 0) {
80 perror("socket");
81 goto error;
82 }
83
84 memset(&sun, 0, sizeof(sun));
85 sun.sun_family = AF_UNIX;
86 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
87
88 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
89 if (ret < 0) {
90 perror("connect");
91 goto error;
92 }
93
94 return fd;
95
96 error:
97 return -1;
98 }
99
100 /*
101 * lttcomm_accept_unix_sock
102 *
103 * Do an accept(2) on the sock and return the
104 * new file descriptor. The socket MUST be bind(2) before.
105 */
106 int lttcomm_accept_unix_sock(int sock)
107 {
108 int new_fd;
109 struct sockaddr_un sun;
110 socklen_t len = 0;
111
112 /* Blocking call */
113 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
114 if (new_fd < 0) {
115 perror("accept");
116 goto error;
117 }
118
119 return new_fd;
120
121 error:
122 return -1;
123 }
124
125 /*
126 * lttcomm_create_unix_sock
127 *
128 * Creates a AF_UNIX local socket using pathname
129 * bind the socket upon creation and return the fd.
130 */
131 int lttcomm_create_unix_sock(const char *pathname)
132 {
133 struct sockaddr_un sun;
134 int fd;
135 int ret = -1;
136
137 /* Create server socket */
138 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
139 perror("socket");
140 goto error;
141 }
142
143 memset(&sun, 0, sizeof(sun));
144 sun.sun_family = AF_UNIX;
145 strncpy(sun.sun_path, pathname, strlen(pathname));
146
147 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
148 if (ret < 0) {
149 perror("bind");
150 goto error;
151 }
152
153 return fd;
154
155 error:
156 return ret;
157 }
158
159 /*
160 * lttcomm_listen_unix_sock
161 *
162 * Make the socket listen using MAX_LISTEN.
163 */
164 int lttcomm_listen_unix_sock(int sock)
165 {
166 int ret;
167
168 ret = listen(sock, MAX_LISTEN);
169 if (ret < 0) {
170 perror("listen");
171 }
172
173 return ret;
174 }
175
176 /*
177 * lttcomm_recv_unix_sock
178 *
179 * Receive data of size len in put that data into
180 * the buf param. Using recvmsg API.
181 * Return the size of received data.
182 */
183 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
184 {
185 struct msghdr msg;
186 struct iovec iov[1];
187 ssize_t ret = -1;
188
189 memset(&msg, 0, sizeof(msg));
190
191 iov[0].iov_base = buf;
192 iov[0].iov_len = len;
193 msg.msg_iov = iov;
194 msg.msg_iovlen = 1;
195
196 ret = recvmsg(sock, &msg, 0);
197 if (ret < 0) {
198 perror("recvmsg");
199 }
200
201 return ret;
202 }
203
204 /*
205 * lttcomm_send_unix_sock
206 *
207 * Send buf data of size len. Using sendmsg API.
208 * Return the size of sent data.
209 */
210 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
211 {
212 struct msghdr msg;
213 struct iovec iov[1];
214 ssize_t ret = -1;
215
216 memset(&msg, 0, sizeof(msg));
217
218 iov[0].iov_base = buf;
219 iov[0].iov_len = len;
220 msg.msg_iov = iov;
221 msg.msg_iovlen = 1;
222
223 ret = sendmsg(sock, &msg, 0);
224 if (ret < 0) {
225 perror("sendmsg");
226 }
227
228 return ret;
229 }
230
231 /*
232 * lttcomm_close_unix_sock
233 *
234 * Shutdown cleanly a unix socket.
235 */
236 int lttcomm_close_unix_sock(int sock)
237 {
238 int ret;
239
240 /* Shutdown receptions and transmissions */
241 ret = shutdown(sock, SHUT_RDWR);
242 if (ret < 0) {
243 perror("shutdown");
244 }
245
246 return ret;
247 }
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