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20fe2104 DG |
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 | #include <errno.h> | |
20 | #include <stdlib.h> | |
21 | #include <stdio.h> | |
22 | ||
23 | #include "ltt-sessiond.h" | |
24 | #include "libkernelctl.h" | |
25 | #include "kernel-ctl.h" | |
26 | #include "trace.h" | |
27 | ||
28 | /* | |
29 | * kernel_create_session | |
30 | * | |
31 | * Create a new kernel session using the command context session. | |
32 | */ | |
33 | int kernel_create_session(struct command_ctx *cmd_ctx, int tracer_fd) | |
34 | { | |
35 | int ret; | |
36 | struct ltt_kernel_session *lks; | |
37 | ||
38 | /* Allocate a new kernel session */ | |
39 | lks = malloc(sizeof(struct ltt_kernel_session)); | |
40 | if (lks == NULL) { | |
41 | perror("kernel session malloc"); | |
42 | ret = -errno; | |
43 | goto error; | |
44 | } | |
45 | ||
46 | ret = kernctl_create_session(tracer_fd); | |
47 | if (ret < 0) { | |
48 | goto error; | |
49 | } | |
50 | ||
51 | /* Assigning session fd and to the command context */ | |
52 | lks->fd = ret; | |
53 | cmd_ctx->session->kernel_session = lks; | |
54 | cmd_ctx->session->kern_session_count++; | |
55 | ||
56 | return 0; | |
57 | ||
58 | error: | |
59 | return ret; | |
60 | } | |
61 | ||
62 | /* | |
63 | * kernel_create_channel | |
64 | * | |
65 | * Create a kernel channel within the kernel session. | |
66 | */ | |
67 | int kernel_create_channel(struct command_ctx *cmd_ctx) | |
68 | { | |
69 | int ret; | |
70 | struct ltt_kernel_channel *lkc; | |
9cb98350 | 71 | struct lttng_kernel_channel *chan; |
20fe2104 DG |
72 | |
73 | lkc = malloc(sizeof(struct ltt_kernel_channel)); | |
9cb98350 | 74 | chan = malloc(sizeof(struct lttng_kernel_channel)); |
20fe2104 DG |
75 | |
76 | if (lkc == NULL || chan == NULL) { | |
77 | perror("kernel channel malloc"); | |
78 | ret = -errno; | |
79 | goto error; | |
80 | } | |
81 | ||
82 | chan->overwrite = DEFAULT_KERNEL_OVERWRITE; | |
83 | chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; | |
84 | chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; | |
85 | chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; | |
86 | chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; | |
87 | ||
88 | ret = kernctl_create_channel(cmd_ctx->session->kernel_session->fd, chan); | |
89 | if (ret < 0) { | |
90 | goto error; | |
91 | } | |
92 | ||
93 | lkc->fd = ret; | |
94 | lkc->channel = chan; | |
95 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); | |
96 | ||
97 | cmd_ctx->session->kernel_session->channel = lkc; | |
98 | ||
99 | return 0; | |
100 | ||
101 | error: | |
102 | return ret; | |
103 | } |