projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 9e7e4892 MD |
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"); |