| 1 | /* |
| 2 | * (C) Copyright 2009-2011 - |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * LTTng PID context. |
| 6 | * |
| 7 | * Dual LGPL v2.1/GPL v2 license. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include "../ltt-events.h" |
| 14 | #include "../wrapper/ringbuffer/frontend_types.h" |
| 15 | #include "../wrapper/vmalloc.h" |
| 16 | #include "../ltt-tracer.h" |
| 17 | |
| 18 | static |
| 19 | void pid_record(struct lttng_ctx_field *field, |
| 20 | struct lib_ring_buffer_ctx *ctx, |
| 21 | struct ltt_channel *chan) |
| 22 | { |
| 23 | pid_t pid; |
| 24 | |
| 25 | pid = current->pid; |
| 26 | lib_ring_buffer_align_ctx(ctx, ltt_alignof(pid)); |
| 27 | chan->ops->event_write(ctx, &pid, sizeof(pid)); |
| 28 | } |
| 29 | |
| 30 | int lttng_add_pid_to_ctx(struct lttng_ctx **ctx) |
| 31 | { |
| 32 | struct lttng_ctx_field *field; |
| 33 | int ret; |
| 34 | |
| 35 | field = lttng_append_context(ctx); |
| 36 | if (!field) |
| 37 | return ret; |
| 38 | field->name = "pid"; |
| 39 | field->type.atype = atype_integer; |
| 40 | field->type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT; |
| 41 | field->type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT; |
| 42 | field->type.u.basic.integer.signedness = is_signed_type(pid_t); |
| 43 | field->type.u.basic.integer.reverse_byte_order = 0; |
| 44 | field->type.u.basic.integer.base = 10; |
| 45 | field->type.u.basic.integer.encoding = lttng_encode_none; |
| 46 | field->callback = pid_record; |
| 47 | wrapper_vmalloc_sync_all(); |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | MODULE_LICENSE("GPL and additional rights"); |
| 52 | MODULE_AUTHOR("Mathieu Desnoyers"); |
| 53 | MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support"); |