Initial import of kconsumerd and libkernelctl
[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(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
52 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
53 [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
54 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread",
55 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd",
56 [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up",
57 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally",
58 [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error",
59 [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile",
60 };
61
62 /*
63 * lttcom_get_readable_code
64 *
65 * Return ptr to string representing a human readable
66 * error code from the lttcomm_return_code enum.
67 *
68 * These code MUST be negative in other to treat that
69 * as an error value.
70 */
71 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
72 {
73 int tmp_code = -code;
74
75 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
76 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
77 }
78
79 return "Unknown error code";
80 }
81
82 /*
83 * lttcomm_connect_unix_sock
84 *
85 * Connect to unix socket using the path name.
86 */
87 int lttcomm_connect_unix_sock(const char *pathname)
88 {
89 struct sockaddr_un sun;
90 int fd;
91 int ret = 1;
92
93 fd = socket(PF_UNIX, SOCK_STREAM, 0);
94 if (fd < 0) {
95 perror("socket");
96 goto error;
97 }
98
99 memset(&sun, 0, sizeof(sun));
100 sun.sun_family = AF_UNIX;
101 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
102
103 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
104 if (ret < 0) {
105 perror("connect");
106 goto error;
107 }
108
109 return fd;
110
111 error:
112 return -1;
113 }
114
115 /*
116 * lttcomm_accept_unix_sock
117 *
118 * Do an accept(2) on the sock and return the
119 * new file descriptor. The socket MUST be bind(2) before.
120 */
121 int lttcomm_accept_unix_sock(int sock)
122 {
123 int new_fd;
124 struct sockaddr_un sun;
125 socklen_t len = 0;
126
127 /* Blocking call */
128 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
129 if (new_fd < 0) {
130 perror("accept");
131 goto error;
132 }
133
134 return new_fd;
135
136 error:
137 return -1;
138 }
139
140 /*
141 * lttcomm_create_unix_sock
142 *
143 * Creates a AF_UNIX local socket using pathname
144 * bind the socket upon creation and return the fd.
145 */
146 int lttcomm_create_unix_sock(const char *pathname)
147 {
148 struct sockaddr_un sun;
149 int fd;
150 int ret = -1;
151
152 /* Create server socket */
153 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
154 perror("socket");
155 goto error;
156 }
157
158 memset(&sun, 0, sizeof(sun));
159 sun.sun_family = AF_UNIX;
160 strncpy(sun.sun_path, pathname, strlen(pathname));
161
162 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
163 if (ret < 0) {
164 perror("bind");
165 goto error;
166 }
167
168 return fd;
169
170 error:
171 return ret;
172 }
173
174 /*
175 * lttcomm_listen_unix_sock
176 *
177 * Make the socket listen using MAX_LISTEN.
178 */
179 int lttcomm_listen_unix_sock(int sock)
180 {
181 int ret;
182
183 ret = listen(sock, MAX_LISTEN);
184 if (ret < 0) {
185 perror("listen");
186 }
187
188 return ret;
189 }
190
191 /*
192 * lttcomm_recv_unix_sock
193 *
194 * Receive data of size len in put that data into
195 * the buf param. Using recvmsg API.
196 * Return the size of received data.
197 */
198 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
199 {
200 struct msghdr msg;
201 struct iovec iov[1];
202 ssize_t ret = -1;
203
204 memset(&msg, 0, sizeof(msg));
205
206 iov[0].iov_base = buf;
207 iov[0].iov_len = len;
208 msg.msg_iov = iov;
209 msg.msg_iovlen = 1;
210
211 ret = recvmsg(sock, &msg, 0);
212 if (ret < 0) {
213 perror("recvmsg");
214 }
215
216 return ret;
217 }
218
219 /*
220 * lttcomm_send_unix_sock
221 *
222 * Send buf data of size len. Using sendmsg API.
223 * Return the size of sent data.
224 */
225 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
226 {
227 struct msghdr msg;
228 struct iovec iov[1];
229 ssize_t ret = -1;
230
231 memset(&msg, 0, sizeof(msg));
232
233 iov[0].iov_base = buf;
234 iov[0].iov_len = len;
235 msg.msg_iov = iov;
236 msg.msg_iovlen = 1;
237
238 ret = sendmsg(sock, &msg, 0);
239 if (ret < 0) {
240 perror("sendmsg");
241 }
242
243 return ret;
244 }
245
246 /*
247 * lttcomm_close_unix_sock
248 *
249 * Shutdown cleanly a unix socket.
250 */
251 int lttcomm_close_unix_sock(int sock)
252 {
253 int ret;
254
255 /* Shutdown receptions and transmissions */
256 ret = shutdown(sock, SHUT_RDWR);
257 if (ret < 0) {
258 perror("shutdown");
259 }
260
261 return ret;
262 }
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