d754f59daee86876a1fef4e783b0a75ab62545db
[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_NO_TRACE) ] = "No trace found",
44 [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
45 [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
46 [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
47 [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
48 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
49 [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
50 [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
51 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
52 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
53 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
54 [ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
55 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
56 [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
57 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
58 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
59 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
60 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
61 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
62 [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
63 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found",
64 };
65
66 /*
67 * lttcom_get_readable_code
68 *
69 * Return ptr to string representing a human readable
70 * error code from the lttcomm_return_code enum.
71 *
72 * These code MUST be negative in other to treat that
73 * as an error value.
74 */
75 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
76 {
77 int tmp_code = -code;
78
79 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
80 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
81 }
82
83 return "Unknown error code";
84 }
85
86 /*
87 * lttcomm_connect_unix_sock
88 *
89 * Connect to unix socket using the path name.
90 */
91 int lttcomm_connect_unix_sock(const char *pathname)
92 {
93 struct sockaddr_un sun;
94 int fd;
95 int ret = 1;
96
97 fd = socket(PF_UNIX, SOCK_STREAM, 0);
98 if (fd < 0) {
99 perror("socket");
100 goto error;
101 }
102
103 memset(&sun, 0, sizeof(sun));
104 sun.sun_family = AF_UNIX;
105 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
106
107 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
108 if (ret < 0) {
109 perror("connect");
110 goto error;
111 }
112
113 return fd;
114
115 error:
116 return -1;
117 }
118
119 /*
120 * lttcomm_accept_unix_sock
121 *
122 * Do an accept(2) on the sock and return the
123 * new file descriptor. The socket MUST be bind(2) before.
124 */
125 int lttcomm_accept_unix_sock(int sock)
126 {
127 int new_fd;
128 struct sockaddr_un sun;
129 socklen_t len = 0;
130
131 /* Blocking call */
132 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
133 if (new_fd < 0) {
134 perror("accept");
135 goto error;
136 }
137
138 return new_fd;
139
140 error:
141 return -1;
142 }
143
144 /*
145 * lttcomm_create_unix_sock
146 *
147 * Creates a AF_UNIX local socket using pathname
148 * bind the socket upon creation and return the fd.
149 */
150 int lttcomm_create_unix_sock(const char *pathname)
151 {
152 struct sockaddr_un sun;
153 int fd;
154 int ret = -1;
155
156 /* Create server socket */
157 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
158 perror("socket");
159 goto error;
160 }
161
162 memset(&sun, 0, sizeof(sun));
163 sun.sun_family = AF_UNIX;
164 strncpy(sun.sun_path, pathname, strlen(pathname));
165
166 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
167 if (ret < 0) {
168 perror("bind");
169 goto error;
170 }
171
172 return fd;
173
174 error:
175 return ret;
176 }
177
178 /*
179 * lttcomm_listen_unix_sock
180 *
181 * Make the socket listen using MAX_LISTEN.
182 */
183 int lttcomm_listen_unix_sock(int sock)
184 {
185 int ret;
186
187 ret = listen(sock, MAX_LISTEN);
188 if (ret < 0) {
189 perror("listen");
190 }
191
192 return ret;
193 }
194
195 /*
196 * lttcomm_recv_unix_sock
197 *
198 * Receive data of size len in put that data into
199 * the buf param. Using recvmsg API.
200 * Return the size of received data.
201 */
202 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
203 {
204 struct msghdr msg;
205 struct iovec iov[1];
206 ssize_t ret = -1;
207
208 memset(&msg, 0, sizeof(msg));
209
210 iov[0].iov_base = buf;
211 iov[0].iov_len = len;
212 msg.msg_iov = iov;
213 msg.msg_iovlen = 1;
214
215 ret = recvmsg(sock, &msg, 0);
216 if (ret < 0) {
217 perror("recvmsg");
218 }
219
220 return ret;
221 }
222
223 /*
224 * lttcomm_send_unix_sock
225 *
226 * Send buf data of size len. Using sendmsg API.
227 * Return the size of sent data.
228 */
229 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
230 {
231 struct msghdr msg;
232 struct iovec iov[1];
233 ssize_t ret = -1;
234
235 memset(&msg, 0, sizeof(msg));
236
237 iov[0].iov_base = buf;
238 iov[0].iov_len = len;
239 msg.msg_iov = iov;
240 msg.msg_iovlen = 1;
241
242 ret = sendmsg(sock, &msg, 0);
243 if (ret < 0) {
244 perror("sendmsg");
245 }
246
247 return ret;
248 }
249
250 /*
251 * lttcomm_close_unix_sock
252 *
253 * Shutdown cleanly a unix socket.
254 */
255 int lttcomm_close_unix_sock(int sock)
256 {
257 int ret;
258
259 /* Shutdown receptions and transmissions */
260 ret = shutdown(sock, SHUT_RDWR);
261 if (ret < 0) {
262 perror("shutdown");
263 }
264
265 return ret;
266 }
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