Fatal error causes kconsumerd to exit
[lttng-tools.git] / ltt-sessiond / kernel-ctl.c
CommitLineData
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 */
33int 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
58error:
59 return ret;
60}
61
62/*
63 * kernel_create_channel
64 *
65 * Create a kernel channel within the kernel session.
66 */
67int kernel_create_channel(struct command_ctx *cmd_ctx)
68{
69 int ret;
70 struct ltt_kernel_channel *lkc;
71 struct lttng_channel *chan;
72
73 lkc = malloc(sizeof(struct ltt_kernel_channel));
74 chan = malloc(sizeof(struct lttng_channel));
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
101error:
102 return ret;
103}
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