ust-fd: Add close_range declaration

[lttng-ust.git] / liblttng-ust / lttng-context-user-ns.c

diff --git a/liblttng-ust/lttng-context-user-ns.c b/liblttng-ust/lttng-context-user-ns.c
deleted file mode 100644 (file)
index 9d31da5..0000000
--- a/liblttng-ust/lttng-context-user-ns.c
+++ /dev/null
@@ -1,131 +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 user 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 <lttng/ringbuffer-context.h>
-
-#include "context-internal.h"
-#include "ns.h"
-
-/*
- * We cache the result to ensure we don't stat(2) the proc filesystem on
- * each event. The user namespace is global to the process.
- */
-static ino_t cached_user_ns = NS_INO_UNINITIALIZED;
-
-static
-ino_t get_user_ns(void)
-{
-       struct stat sb;
-       ino_t user_ns;
-
-       user_ns = CMM_LOAD_SHARED(cached_user_ns);
-
-       /*
-        * If the cache is populated, do nothing and return the
-        * cached inode number.
-        */
-       if (caa_likely(user_ns != NS_INO_UNINITIALIZED))
-               return user_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.
-        */
-       user_ns = NS_INO_UNAVAILABLE;
-
-       if (stat("/proc/self/ns/user", &sb) == 0) {
-               user_ns = sb.st_ino;
-       }
-
-       /*
-        * And finally, store the inode number in the cache.
-        */
-       CMM_STORE_SHARED(cached_user_ns, user_ns);
-
-       return user_ns;
-}
-
-/*
- * The user namespace can change for 3 reasons
- *  * clone(2) called with CLONE_NEWUSER
- *  * setns(2) called with the fd of a different user ns
- *  * unshare(2) called with CLONE_NEWUSER
- */
-void lttng_context_user_ns_reset(void)
-{
-       CMM_STORE_SHARED(cached_user_ns, NS_INO_UNINITIALIZED);
-}
-
-static
-size_t user_ns_get_size(void *priv __attribute__((unused)),
-               size_t offset)
-{
-       size_t size = 0;
-
-       size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(ino_t));
-       size += sizeof(ino_t);
-       return size;
-}
-
-static
-void user_ns_record(void *priv __attribute__((unused)),
-                struct lttng_ust_lib_ring_buffer_ctx *ctx,
-                struct lttng_ust_channel_buffer *chan)
-{
-       ino_t user_ns;
-
-       user_ns = get_user_ns();
-       chan->ops->event_write(ctx, &user_ns, sizeof(user_ns), lttng_ust_rb_alignof(user_ns));
-}
-
-static
-void user_ns_get_value(void *priv __attribute__((unused)),
-               struct lttng_ust_ctx_value *value)
-{
-       value->u.s64 = get_user_ns();
-}
-
-static const struct lttng_ust_ctx_field *ctx_field = lttng_ust_static_ctx_field(
-       lttng_ust_static_event_field("user_ns",
-               lttng_ust_static_type_integer(sizeof(ino_t) * CHAR_BIT,
-                               lttng_ust_rb_alignof(ino_t) * CHAR_BIT,
-                               lttng_ust_is_signed_type(ino_t),
-                               BYTE_ORDER, 10),
-               false, false),
-       user_ns_get_size,
-       user_ns_record,
-       user_ns_get_value,
-       NULL, NULL);
-
-int lttng_add_user_ns_to_ctx(struct lttng_ust_ctx **ctx)
-{
-       int ret;
-
-       if (lttng_find_context(*ctx, ctx_field->event_field->name)) {
-               ret = -EEXIST;
-               goto error_find_context;
-       }
-       ret = lttng_ust_context_append(ctx, ctx_field);
-       if (ret)
-               return ret;
-       return 0;
-
-error_find_context:
-       return ret;
-}