Add listing session option
[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 };
44
45 /*
46 * lttcom_get_readable_code
47 *
48 * Return ptr to string representing a human readable
49 * error code from the lttcomm_return_code enum.
50 *
51 * These code MUST be negative in other to treat that
52 * as an error value.
53 */
54 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
55 {
56 int tmp_code = -code;
57
58 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
59 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
60 }
61
62 return "Unknown error code";
63 }
64
65 /*
66 * lttcomm_connect_unix_sock
67 *
68 * Connect to unix socket using the path name.
69 */
70 int lttcomm_connect_unix_sock(const char *pathname)
71 {
72 struct sockaddr_un sun;
73 int fd;
74 int ret = 1;
75
76 fd = socket(PF_UNIX, SOCK_STREAM, 0);
77 if (fd < 0) {
78 perror("socket");
79 goto error;
80 }
81
82 memset(&sun, 0, sizeof(sun));
83 sun.sun_family = AF_UNIX;
84 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
85
86 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
87 if (ret < 0) {
88 perror("connect");
89 goto error;
90 }
91
92 return fd;
93
94 error:
95 return -1;
96 }
97
98 /*
99 * lttcomm_accept_unix_sock
100 *
101 * Do an accept(2) on the sock and return the
102 * new file descriptor. The socket MUST be bind(2) before.
103 */
104 int lttcomm_accept_unix_sock(int sock)
105 {
106 int new_fd;
107 struct sockaddr_un sun;
108 socklen_t len = 0;
109
110 /* Blocking call */
111 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
112 if (new_fd < 0) {
113 perror("accept");
114 goto error;
115 }
116
117 return new_fd;
118
119 error:
120 return -1;
121 }
122
123 /*
124 * lttcomm_create_unix_sock
125 *
126 * Creates a AF_UNIX local socket using pathname
127 * bind the socket upon creation and return the fd.
128 */
129 int lttcomm_create_unix_sock(const char *pathname)
130 {
131 struct sockaddr_un sun;
132 int fd;
133 int ret = -1;
134
135 /* Create server socket */
136 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
137 perror("socket");
138 goto error;
139 }
140
141 memset(&sun, 0, sizeof(sun));
142 sun.sun_family = AF_UNIX;
143 strncpy(sun.sun_path, pathname, strlen(pathname));
144
145 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
146 if (ret < 0) {
147 perror("bind");
148 goto error;
149 }
150
151 return fd;
152
153 error:
154 return ret;
155 }
156
157 /*
158 * lttcomm_listen_unix_sock
159 *
160 * Make the socket listen using MAX_LISTEN.
161 */
162 int lttcomm_listen_unix_sock(int sock)
163 {
164 int ret;
165
166 ret = listen(sock, MAX_LISTEN);
167 if (ret < 0) {
168 perror("listen");
169 }
170
171 return ret;
172 }
173
174 /*
175 * lttcomm_recv_unix_sock
176 *
177 * Receive data of size len in put that data into
178 * the buf param. Using recvmsg API.
179 * Return the size of received data.
180 */
181 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
182 {
183 struct msghdr msg;
184 struct iovec iov[1];
185 ssize_t ret = -1;
186
187 memset(&msg, 0, sizeof(msg));
188
189 iov[0].iov_base = buf;
190 iov[0].iov_len = len;
191 msg.msg_iov = iov;
192 msg.msg_iovlen = 1;
193
194 ret = recvmsg(sock, &msg, 0);
195 if (ret < 0) {
196 perror("recvmsg");
197 }
198
199 return ret;
200 }
201
202 /*
203 * lttcomm_send_unix_sock
204 *
205 * Send buf data of size len. Using sendmsg API.
206 * Return the size of sent data.
207 */
208 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
209 {
210 struct msghdr msg;
211 struct iovec iov[1];
212 ssize_t ret = -1;
213
214 memset(&msg, 0, sizeof(msg));
215
216 iov[0].iov_base = buf;
217 iov[0].iov_len = len;
218 msg.msg_iov = iov;
219 msg.msg_iovlen = 1;
220
221 ret = sendmsg(sock, &msg, 0);
222 if (ret < 0) {
223 perror("sendmsg");
224 }
225
226 return ret;
227 }
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