#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/utsname.h>
-#include "lttng-events.h"
-#include "wrapper/ringbuffer/frontend_types.h"
-#include "wrapper/vmalloc.h"
-#include "lttng-tracer.h"
+#include <lttng-events.h>
+#include <wrapper/ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <lttng-tracer.h>
#define LTTNG_HOSTNAME_CTX_LEN (__NEW_UTS_LEN + 1)
struct uts_namespace *ns;
char *hostname;
- rcu_read_lock();
- nsproxy = task_nsproxy(current);
+ /*
+ * No need to take the RCU read-side lock to read current
+ * nsproxy. (documented in nsproxy.h)
+ */
+ nsproxy = current->nsproxy;
if (nsproxy) {
ns = nsproxy->uts_ns;
hostname = ns->name.nodename;
chan->ops->event_memset(ctx, 0,
LTTNG_HOSTNAME_CTX_LEN);
}
- rcu_read_unlock();
+}
+
+static
+void hostname_get_value(struct lttng_ctx_field *field,
+ struct lttng_probe_ctx *lttng_probe_ctx,
+ union lttng_ctx_value *value)
+{
+ struct nsproxy *nsproxy;
+ struct uts_namespace *ns;
+ char *hostname;
+
+ /*
+ * No need to take the RCU read-side lock to read current
+ * nsproxy. (documented in nsproxy.h)
+ */
+ nsproxy = current->nsproxy;
+ if (nsproxy) {
+ ns = nsproxy->uts_ns;
+ hostname = ns->name.nodename;
+ } else {
+ hostname = "";
+ }
+ value->str = hostname;
}
int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx)
field->event_field.type.u.array.elem_type.atype = atype_integer;
field->event_field.type.u.array.elem_type.u.basic.integer.size = sizeof(char) * CHAR_BIT;
field->event_field.type.u.array.elem_type.u.basic.integer.alignment = lttng_alignof(char) * CHAR_BIT;
- field->event_field.type.u.array.elem_type.u.basic.integer.signedness = is_signed_type(char);
+ field->event_field.type.u.array.elem_type.u.basic.integer.signedness = lttng_is_signed_type(char);
field->event_field.type.u.array.elem_type.u.basic.integer.reverse_byte_order = 0;
field->event_field.type.u.array.elem_type.u.basic.integer.base = 10;
field->event_field.type.u.array.elem_type.u.basic.integer.encoding = lttng_encode_UTF8;
field->get_size = hostname_get_size;
field->record = hostname_record;
+ field->get_value = hostname_get_value;
+ lttng_context_update(*ctx);
wrapper_vmalloc_sync_all();
return 0;
}
EXPORT_SYMBOL_GPL(lttng_add_hostname_to_ctx);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support");