#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)
}
}
+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)
{
struct lttng_ctx_field *field;
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");
-MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
- __stringify(LTTNG_MODULES_MINOR_VERSION) "."
- __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
- LTTNG_MODULES_EXTRAVERSION);