--- /dev/null
+/*
+ * (C) Copyright 2009-2011 -
+ * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * LTTng PID context.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include "../ltt-events.h"
+#include "../wrapper/ringbuffer/frontend_types.h"
+#include "../wrapper/vmalloc.h"
+#include "../ltt-tracer.h"
+
+static
+void pid_record(struct lttng_ctx_field *field,
+ struct lib_ring_buffer_ctx *ctx,
+ struct ltt_channel *chan)
+{
+ pid_t pid;
+
+ pid = current->pid;
+ lib_ring_buffer_align_ctx(ctx, ltt_alignof(pid));
+ chan->ops->event_write(ctx, &pid, sizeof(pid));
+}
+
+int lttng_add_pid_to_ctx(struct lttng_ctx **ctx)
+{
+ struct lttng_ctx_field *field;
+ int ret;
+
+ field = lttng_append_context(ctx);
+ if (!field)
+ return ret;
+ field->name = "pid";
+ field->type.atype = atype_integer;
+ field->type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT;
+ field->type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT;
+ field->type.u.basic.integer.signedness = is_signed_type(pid_t);
+ field->type.u.basic.integer.reverse_byte_order = 0;
+ field->type.u.basic.integer.base = 10;
+ field->type.u.basic.integer.encoding = lttng_encode_none;
+ field->callback = pid_record;
+ wrapper_vmalloc_sync_all();
+ return 0;
+}
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support");