d2d22bc5d69ca1946ae6270c30cdb889c5da5661
[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 };
43
44 /*
45 * lttcom_get_readable_code
46 *
47 * Return ptr to string representing a human readable
48 * error code from the lttcomm_return_code enum.
49 *
50 * These code MUST be negative in other to treat that
51 * as an error value.
52 */
53 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
54 {
55 int tmp_code = -code;
56
57 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
58 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
59 }
60
61 return "Unknown error code";
62 }
63
64 /*
65 * lttcomm_connect_unix_sock
66 *
67 * Connect to unix socket using the path name.
68 */
69 int lttcomm_connect_unix_sock(const char *pathname)
70 {
71 struct sockaddr_un sun;
72 int fd;
73 int ret = 1;
74
75 fd = socket(PF_UNIX, SOCK_STREAM, 0);
76 if (fd < 0) {
77 perror("socket");
78 goto error;
79 }
80
81 memset(&sun, 0, sizeof(sun));
82 sun.sun_family = AF_UNIX;
83 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
84
85 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
86 if (ret < 0) {
87 perror("connect");
88 goto error;
89 }
90
91 return fd;
92
93 error:
94 return -1;
95 }
96
97 /*
98 * lttcomm_accept_unix_sock
99 *
100 * Do an accept(2) on the sock and return the
101 * new file descriptor. The socket MUST be bind(2) before.
102 */
103 int lttcomm_accept_unix_sock(int sock)
104 {
105 int new_fd;
106 struct sockaddr_un sun;
107 socklen_t len = 0;
108
109 /* Blocking call */
110 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
111 if (new_fd < 0) {
112 perror("accept");
113 goto error;
114 }
115
116 return new_fd;
117
118 error:
119 return -1;
120 }
121
122 /*
123 * lttcomm_create_unix_sock
124 *
125 * Creates a AF_UNIX local socket using pathname
126 * bind the socket upon creation and return the fd.
127 */
128 int lttcomm_create_unix_sock(const char *pathname)
129 {
130 struct sockaddr_un sun;
131 int fd;
132 int ret = -1;
133
134 /* Create server socket */
135 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
136 perror("socket");
137 goto error;
138 }
139
140 memset(&sun, 0, sizeof(sun));
141 sun.sun_family = AF_UNIX;
142 strncpy(sun.sun_path, pathname, strlen(pathname));
143
144 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
145 if (ret < 0) {
146 perror("bind");
147 goto error;
148 }
149
150 return fd;
151
152 error:
153 return ret;
154 }
155
156 /*
157 * lttcomm_listen_unix_sock
158 *
159 * Make the socket listen using MAX_LISTEN.
160 */
161 int lttcomm_listen_unix_sock(int sock)
162 {
163 int ret;
164
165 ret = listen(sock, MAX_LISTEN);
166 if (ret < 0) {
167 perror("listen");
168 }
169
170 return ret;
171 }
172
173 /*
174 * lttcomm_recv_unix_sock
175 *
176 * Receive data of size len in put that data into
177 * the buf param. Using recvmsg API.
178 * Return the size of received data.
179 */
180 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
181 {
182 struct msghdr msg;
183 struct iovec iov[1];
184 ssize_t ret = -1;
185
186 memset(&msg, 0, sizeof(msg));
187
188 iov[0].iov_base = buf;
189 iov[0].iov_len = len;
190 msg.msg_iov = iov;
191 msg.msg_iovlen = 1;
192
193 ret = recvmsg(sock, &msg, 0);
194 if (ret < 0) {
195 perror("recvmsg");
196 }
197
198 return ret;
199 }
200
201 /*
202 * lttcomm_send_unix_sock
203 *
204 * Send buf data of size len. Using sendmsg API.
205 * Return the size of sent data.
206 */
207 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
208 {
209 struct msghdr msg;
210 struct iovec iov[1];
211 ssize_t ret = -1;
212
213 memset(&msg, 0, sizeof(msg));
214
215 iov[0].iov_base = buf;
216 iov[0].iov_len = len;
217 msg.msg_iov = iov;
218 msg.msg_iovlen = 1;
219
220 ret = sendmsg(sock, &msg, 0);
221 if (ret < 0) {
222 perror("sendmsg");
223 }
224
225 return ret;
226 }
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