Fix: liblttng-ctl: unreported truncations when copying strings
[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl-helper.h
1 /*
2 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #ifndef LTTNG_CTL_HELPER_H
9 #define LTTNG_CTL_HELPER_H
10
11 #include <stdio.h>
12
13 #include <common/sessiond-comm/sessiond-comm.h>
14 #include <lttng/lttng.h>
15
16 /*
17 * NOTE: Every symbol in this helper header MUST be set to hidden so not to
18 * polute the library name space. Use LTTNG_HIDDEN macro before declaring the
19 * function in the C file.
20 */
21
22 /* Copy helper functions. */
23 void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
24 struct lttng_domain *src);
25
26 /*
27 * Sends the lttcomm message to the session daemon and fills buf if the
28 * returned data is not NULL.
29 *
30 * Return the size of the received data on success or else a negative lttng
31 * error code. If buf is NULL, 0 is returned on success.
32 */
33 int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
34 const int *fds, size_t nb_fd,
35 const void *vardata, size_t vardata_len,
36 void **user_payload_buf, void **user_cmd_header_buf,
37 size_t *user_cmd_header_len);
38
39 /*
40 * Sends the lttcomm message to the session daemon and fills the reply payload.
41 *
42 * Return the size of the received data on success or else a negative lttng
43 * error code.
44 */
45 LTTNG_HIDDEN
46 int lttng_ctl_ask_sessiond_payload(struct lttng_payload_view *message,
47 struct lttng_payload *reply);
48
49 /*
50 * Calls lttng_ctl_ask_sessiond_fds_varlen() with no expected command header.
51 */
52 static inline int lttng_ctl_ask_sessiond_varlen_no_cmd_header(
53 struct lttcomm_session_msg *lsm,
54 const void *vardata,
55 size_t vardata_len,
56 void **user_payload_buf)
57 {
58 return lttng_ctl_ask_sessiond_fds_varlen(lsm, NULL, 0, vardata,
59 vardata_len, user_payload_buf, NULL, NULL);
60 }
61
62 /*
63 * Calls lttng_ctl_ask_sessiond_fds_varlen() with fds and no expected command header.
64 */
65 static inline
66 int lttng_ctl_ask_sessiond_fds_no_cmd_header(struct lttcomm_session_msg *lsm,
67 const int *fds, size_t nb_fd, void **buf)
68 {
69 return lttng_ctl_ask_sessiond_fds_varlen(lsm, fds, nb_fd, NULL,
70 0, NULL, NULL, NULL);
71 }
72 /*
73 * Use this if no variable length data needs to be sent.
74 */
75 static inline
76 int lttng_ctl_ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
77 {
78 return lttng_ctl_ask_sessiond_varlen_no_cmd_header(lsm, NULL, 0, buf);
79 }
80
81 int lttng_check_tracing_group(void);
82
83 int connect_sessiond(void);
84
85 #endif /* LTTNG_CTL_HELPER_H */
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