b7a28268cb3b4ce83b95eb978667951527064212
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl-helper.h
1 /*
2 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
3 *
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License, version 2.1 only,
6 * as published by the Free Software Foundation.
7 *
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16 */
17
18 #ifndef LTTNG_CTL_HELPER_H
19 #define LTTNG_CTL_HELPER_H
20
21 #include <stdio.h>
22
23 #include <common/sessiond-comm/sessiond-comm.h>
24 #include <lttng/lttng.h>
25
26 /*
27 * NOTE: Every symbol in this helper header MUST be set to hidden so not to
28 * polute the library name space. Use LTTNG_HIDDEN macro before declaring the
29 * function in the C file.
30 */
31
32 /* Copy helper functions. */
33 void lttng_ctl_copy_string(char *dst, const char *src, size_t len);
34 void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
35 struct lttng_domain *src);
36
37 /*
38 * Sends the lttcomm message to the session daemon and fills buf if the
39 * returned data is not NULL.
40 *
41 * Return the size of the received data on success or else a negative lttng
42 * error code. If buf is NULL, 0 is returned on success.
43 */
44 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
45 const void *vardata, size_t varlen, void **buf);
46
47 /*
48 * Use this if no variable length data needs to be sent.
49 */
50 static inline
51 int lttng_ctl_ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
52 {
53 return lttng_ctl_ask_sessiond_varlen(lsm, NULL, 0, buf);
54 }
55
56 int lttng_check_tracing_group(void);
57
58 #endif /* LTTNG_CTL_HELPER_H */
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