Handle splice errors
[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.c
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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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.
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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 */
35static 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",
e065084a 41 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
57167058 42 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESS) ] = "No session found",
ce3d728c 43 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
ca95a216 44 [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
df0da139 45 [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
379473d2 46 [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
520ff687 47 [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
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48 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
49 [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
27673bb6 50 [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
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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",
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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",
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63 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF",
64 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL",
65 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM",
66 [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE",
894be886 67 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "No event found",
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68};
69
70/*
71 * lttcom_get_readable_code
72 *
73 * Return ptr to string representing a human readable
74 * error code from the lttcomm_return_code enum.
75 *
76 * These code MUST be negative in other to treat that
77 * as an error value.
78 */
79const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
80{
81 int tmp_code = -code;
82
83 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
84 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
85 }
86
87 return "Unknown error code";
88}
89
90/*
91 * lttcomm_connect_unix_sock
92 *
93 * Connect to unix socket using the path name.
94 */
95int lttcomm_connect_unix_sock(const char *pathname)
96{
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97 struct sockaddr_un sun;
98 int fd;
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99 int ret = 1;
100
686204ab 101 fd = socket(PF_UNIX, SOCK_STREAM, 0);
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102 if (fd < 0) {
103 perror("socket");
104 goto error;
105 }
106
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107 memset(&sun, 0, sizeof(sun));
108 sun.sun_family = AF_UNIX;
109 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
fac6795d 110
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111 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
112 if (ret < 0) {
113 perror("connect");
fac6795d 114 goto error;
686204ab 115 }
fac6795d 116
686204ab 117 return fd;
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118
119error:
120 return -1;
121}
122
123/*
124 * lttcomm_accept_unix_sock
125 *
126 * Do an accept(2) on the sock and return the
127 * new file descriptor. The socket MUST be bind(2) before.
128 */
129int lttcomm_accept_unix_sock(int sock)
130{
131 int new_fd;
132 struct sockaddr_un sun;
133 socklen_t len = 0;
134
135 /* Blocking call */
136 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
137 if (new_fd < 0) {
138 perror("accept");
139 goto error;
140 }
141
142 return new_fd;
143
144error:
145 return -1;
146}
147
148/*
149 * lttcomm_create_unix_sock
150 *
151 * Creates a AF_UNIX local socket using pathname
152 * bind the socket upon creation and return the fd.
153 */
154int lttcomm_create_unix_sock(const char *pathname)
155{
156 struct sockaddr_un sun;
157 int fd;
158 int ret = -1;
159
160 /* Create server socket */
161 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
162 perror("socket");
163 goto error;
164 }
165
166 memset(&sun, 0, sizeof(sun));
167 sun.sun_family = AF_UNIX;
168 strncpy(sun.sun_path, pathname, strlen(pathname));
169
170 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
171 if (ret < 0) {
172 perror("bind");
173 goto error;
174 }
175
176 return fd;
177
178error:
179 return ret;
180}
181
182/*
183 * lttcomm_listen_unix_sock
184 *
185 * Make the socket listen using MAX_LISTEN.
186 */
187int lttcomm_listen_unix_sock(int sock)
188{
189 int ret;
190
191 ret = listen(sock, MAX_LISTEN);
192 if (ret < 0) {
193 perror("listen");
194 }
195
196 return ret;
197}
198
199/*
200 * lttcomm_recv_unix_sock
201 *
202 * Receive data of size len in put that data into
203 * the buf param. Using recvmsg API.
204 * Return the size of received data.
205 */
206ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
207{
208 struct msghdr msg;
209 struct iovec iov[1];
210 ssize_t ret = -1;
211
212 memset(&msg, 0, sizeof(msg));
213
214 iov[0].iov_base = buf;
215 iov[0].iov_len = len;
216 msg.msg_iov = iov;
217 msg.msg_iovlen = 1;
218
219 ret = recvmsg(sock, &msg, 0);
220 if (ret < 0) {
221 perror("recvmsg");
222 }
223
224 return ret;
225}
226
227/*
228 * lttcomm_send_unix_sock
229 *
230 * Send buf data of size len. Using sendmsg API.
231 * Return the size of sent data.
232 */
233ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
234{
235 struct msghdr msg;
236 struct iovec iov[1];
237 ssize_t ret = -1;
238
239 memset(&msg, 0, sizeof(msg));
240
241 iov[0].iov_base = buf;
242 iov[0].iov_len = len;
243 msg.msg_iov = iov;
244 msg.msg_iovlen = 1;
245
246 ret = sendmsg(sock, &msg, 0);
247 if (ret < 0) {
248 perror("sendmsg");
249 }
250
251 return ret;
252}
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253
254/*
255 * lttcomm_close_unix_sock
256 *
257 * Shutdown cleanly a unix socket.
258 */
259int lttcomm_close_unix_sock(int sock)
260{
261 int ret;
262
263 /* Shutdown receptions and transmissions */
264 ret = shutdown(sock, SHUT_RDWR);
265 if (ret < 0) {
266 perror("shutdown");
267 }
268
269 return ret;
270}
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