X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context-cgroup-ns.c;h=d4053150c5432bcec4ca3a4f4bd9e7142e2185bb;hb=HEAD;hp=31de1cd2b24f00daebe278ee823db9050a001001;hpb=3b8bedd809f1a5b56da5fc101a90b44263b0f473;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-context-cgroup-ns.c b/liblttng-ust/lttng-context-cgroup-ns.c
deleted file mode 100644
index 31de1cd2..00000000
--- a/liblttng-ust/lttng-context-cgroup-ns.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
- *
- * LTTng UST cgroup namespace context.
- */
-
-#define _LGPL_SOURCE
-#include <limits.h>
-#include <stddef.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <ust-tid.h>
-#include <urcu/tls-compat.h>
-#include <lttng/ringbuffer-context.h>
-
-#include "context-internal.h"
-#include "lttng-tracer-core.h"
-#include "ns.h"
-
-
-/*
- * We cache the result to ensure we don't stat(2) the proc filesystem on
- * each event.
- */
-static DEFINE_URCU_TLS_INIT(ino_t, cached_cgroup_ns, NS_INO_UNINITIALIZED);
-
-static
-ino_t get_cgroup_ns(void)
-{
-	struct stat sb;
-	ino_t cgroup_ns;
-
-	cgroup_ns = CMM_LOAD_SHARED(URCU_TLS(cached_cgroup_ns));
-
-	/*
-	 * If the cache is populated, do nothing and return the
-	 * cached inode number.
-	 */
-	if (caa_likely(cgroup_ns != NS_INO_UNINITIALIZED))
-		return cgroup_ns;
-
-	/*
-	 * At this point we have to populate the cache, set the initial
-	 * value to NS_INO_UNAVAILABLE (0), if we fail to get the inode
-	 * number from the proc filesystem, this is the value we will
-	 * cache.
-	 */
-	cgroup_ns = NS_INO_UNAVAILABLE;
-
-	/*
-	 * /proc/thread-self was introduced in kernel v3.17
-	 */
-	if (stat("/proc/thread-self/ns/cgroup", &sb) == 0) {
-		cgroup_ns = sb.st_ino;
-	} else {
-		char proc_ns_path[LTTNG_PROC_NS_PATH_MAX];
-
-		if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX,
-				"/proc/self/task/%d/ns/cgroup",
-				lttng_gettid()) >= 0) {
-
-			if (stat(proc_ns_path, &sb) == 0) {
-				cgroup_ns = sb.st_ino;
-			}
-		}
-	}
-
-	/*
-	 * And finally, store the inode number in the cache.
-	 */
-	CMM_STORE_SHARED(URCU_TLS(cached_cgroup_ns), cgroup_ns);
-
-	return cgroup_ns;
-}
-
-/*
- * The cgroup namespace can change for 3 reasons
- *  * clone(2) called with CLONE_NEWCGROUP
- *  * setns(2) called with the fd of a different cgroup ns
- *  * unshare(2) called with CLONE_NEWCGROUP
- */
-void lttng_context_cgroup_ns_reset(void)
-{
-	CMM_STORE_SHARED(URCU_TLS(cached_cgroup_ns), NS_INO_UNINITIALIZED);
-}
-
-static
-size_t cgroup_ns_get_size(struct lttng_ust_ctx_field *field, size_t offset)
-{
-	size_t size = 0;
-
-	size += lttng_ust_lib_ring_buffer_align(offset, lttng_alignof(ino_t));
-	size += sizeof(ino_t);
-	return size;
-}
-
-static
-void cgroup_ns_record(struct lttng_ust_ctx_field *field,
-		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
-		 struct lttng_ust_channel_buffer *chan)
-{
-	ino_t cgroup_ns;
-
-	cgroup_ns = get_cgroup_ns();
-	lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_alignof(cgroup_ns));
-	chan->ops->event_write(ctx, &cgroup_ns, sizeof(cgroup_ns));
-}
-
-static
-void cgroup_ns_get_value(struct lttng_ust_ctx_field *field,
-		struct lttng_ust_ctx_value *value)
-{
-	value->u.s64 = get_cgroup_ns();
-}
-
-int lttng_add_cgroup_ns_to_ctx(struct lttng_ust_ctx **ctx)
-{
-	struct lttng_ust_ctx_field *field;
-	struct lttng_ust_type_common *type;
-	int ret;
-
-	type = lttng_ust_create_type_integer(sizeof(ino_t) * CHAR_BIT,
-			lttng_alignof(ino_t) * CHAR_BIT,
-			lttng_ust_is_signed_type(ino_t),
-			BYTE_ORDER, 10);
-	if (!type)
-		return -ENOMEM;
-	field = lttng_append_context(ctx);
-	if (!field) {
-		ret = -ENOMEM;
-		goto error_context;
-	}
-	if (lttng_find_context(*ctx, "cgroup_ns")) {
-		ret = -EEXIST;
-		goto error_find_context;
-	}
-	field->event_field->name = strdup("cgroup_ns");
-	if (!field->event_field->name) {
-		ret = -ENOMEM;
-		goto error_name;
-	}
-	field->event_field->type = type;
-	field->get_size = cgroup_ns_get_size;
-	field->record = cgroup_ns_record;
-	field->get_value = cgroup_ns_get_value;
-	lttng_context_update(*ctx);
-	return 0;
-
-error_name:
-error_find_context:
-	lttng_remove_context_field(ctx, field);
-error_context:
-	lttng_ust_destroy_type(type);
-	return ret;
-}
-
-/*
- *  * Force a read (imply TLS fixup for dlopen) of TLS variables.
- *   */
-void lttng_fixup_cgroup_ns_tls(void)
-{
-	asm volatile ("" : : "m" (URCU_TLS(cached_cgroup_ns)));
-}