/usr/src/lttng-modules-2.5.1/lttng-context.c is in lttng-modules-dkms 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /*
* lttng-context.c
*
* LTTng trace/channel/event context management.
*
* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
#include "lttng-events.h"
#include "lttng-tracer.h"
int lttng_find_context(struct lttng_ctx *ctx, const char *name)
{
unsigned int i;
for (i = 0; i < ctx->nr_fields; i++) {
/* Skip allocated (but non-initialized) contexts */
if (!ctx->fields[i].event_field.name)
continue;
if (!strcmp(ctx->fields[i].event_field.name, name))
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(lttng_find_context);
/*
* Note: as we append context information, the pointer location may change.
*/
struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p)
{
struct lttng_ctx_field *field;
struct lttng_ctx *ctx;
if (!*ctx_p) {
*ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL);
if (!*ctx_p)
return NULL;
}
ctx = *ctx_p;
if (ctx->nr_fields + 1 > ctx->allocated_fields) {
struct lttng_ctx_field *new_fields;
ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
new_fields = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
if (!new_fields)
return NULL;
if (ctx->fields)
memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
kfree(ctx->fields);
ctx->fields = new_fields;
}
field = &ctx->fields[ctx->nr_fields];
ctx->nr_fields++;
return field;
}
EXPORT_SYMBOL_GPL(lttng_append_context);
/*
* Remove last context field.
*/
void lttng_remove_context_field(struct lttng_ctx **ctx_p,
struct lttng_ctx_field *field)
{
struct lttng_ctx *ctx;
ctx = *ctx_p;
ctx->nr_fields--;
WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field);
memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
}
EXPORT_SYMBOL_GPL(lttng_remove_context_field);
void lttng_destroy_context(struct lttng_ctx *ctx)
{
int i;
if (!ctx)
return;
for (i = 0; i < ctx->nr_fields; i++) {
if (ctx->fields[i].destroy)
ctx->fields[i].destroy(&ctx->fields[i]);
}
kfree(ctx->fields);
kfree(ctx);
}
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