X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context-procname.c;h=c6d02cf60d3b0692dd449e5f12f08a32b08307bf;hb=HEAD;hp=5e3f9f8a84ce149225974712db0169e899213216;hpb=a084756d092167324ee09d3f819cc45407b58233;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-context-procname.c b/liblttng-ust/lttng-context-procname.c
deleted file mode 100644
index 5e3f9f8a..00000000
--- a/liblttng-ust/lttng-context-procname.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng UST procname context.
- */
-
-#define _LGPL_SOURCE
-#include <stddef.h>
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <lttng/ringbuffer-config.h>
-#include <urcu/tls-compat.h>
-#include <assert.h>
-#include "compat.h"
-
-#include "context-internal.h"
-
-/* Maximum number of nesting levels for the procname cache. */
-#define PROCNAME_NESTING_MAX	2
-
-/*
- * We cache the result to ensure we don't trigger a system call for
- * each event.
- * Upon exec, procname changes, but exec takes care of throwing away
- * this cached version.
- * The procname can also change by calling prctl(). The procname should
- * be set for a thread before the first event is logged within this
- * thread.
- */
-typedef char procname_array[PROCNAME_NESTING_MAX][17];
-
-static DEFINE_URCU_TLS(procname_array, cached_procname);
-
-static DEFINE_URCU_TLS(int, procname_nesting);
-
-static inline
-char *wrapper_getprocname(void)
-{
-	int nesting = CMM_LOAD_SHARED(URCU_TLS(procname_nesting));
-
-	if (caa_unlikely(nesting >= PROCNAME_NESTING_MAX))
-		return "<unknown>";
-	if (caa_unlikely(!URCU_TLS(cached_procname)[nesting][0])) {
-		CMM_STORE_SHARED(URCU_TLS(procname_nesting), nesting + 1);
-		/* Increment nesting before updating cache. */
-		cmm_barrier();
-		lttng_pthread_getname_np(URCU_TLS(cached_procname)[nesting], LTTNG_UST_ABI_PROCNAME_LEN);
-		URCU_TLS(cached_procname)[nesting][LTTNG_UST_ABI_PROCNAME_LEN - 1] = '\0';
-		/* Decrement nesting after updating cache. */
-		cmm_barrier();
-		CMM_STORE_SHARED(URCU_TLS(procname_nesting), nesting);
-	}
-	return URCU_TLS(cached_procname)[nesting];
-}
-
-/* Reset should not be called from a signal handler. */
-void lttng_ust_context_procname_reset(void)
-{
-	CMM_STORE_SHARED(URCU_TLS(cached_procname)[1][0], '\0');
-	CMM_STORE_SHARED(URCU_TLS(procname_nesting), 1);
-	CMM_STORE_SHARED(URCU_TLS(cached_procname)[0][0], '\0');
-	CMM_STORE_SHARED(URCU_TLS(procname_nesting), 0);
-}
-
-static
-size_t procname_get_size(struct lttng_ust_ctx_field *field, size_t offset)
-{
-	return LTTNG_UST_ABI_PROCNAME_LEN;
-}
-
-static
-void procname_record(struct lttng_ust_ctx_field *field,
-		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
-		 struct lttng_channel *chan)
-{
-	char *procname;
-
-	procname = wrapper_getprocname();
-	chan->ops->event_write(ctx, procname, LTTNG_UST_ABI_PROCNAME_LEN);
-}
-
-static
-void procname_get_value(struct lttng_ust_ctx_field *field,
-		struct lttng_ust_ctx_value *value)
-{
-	value->u.str = wrapper_getprocname();
-}
-
-int lttng_add_procname_to_ctx(struct lttng_ust_ctx **ctx)
-{
-	struct lttng_ust_ctx_field *field;
-	struct lttng_ust_type_common *type;
-	int ret;
-
-	type = lttng_ust_create_type_array_text(LTTNG_UST_ABI_PROCNAME_LEN);
-	if (!type)
-		return -ENOMEM;
-	field = lttng_append_context(ctx);
-	if (!field) {
-		ret = -ENOMEM;
-		goto error_context;
-	}
-	if (lttng_find_context(*ctx, "procname")) {
-		ret = -EEXIST;
-		goto error_find_context;
-	}
-	field->event_field->name = strdup("procname");
-	if (!field->event_field->name) {
-		ret = -ENOMEM;
-		goto error_name;
-	}
-	field->event_field->type = type;
-	field->get_size = procname_get_size;
-	field->record = procname_record;
-	field->get_value = procname_get_value;
-	lttng_context_update(*ctx);
-	return 0;
-
-error_name:
-error_find_context:
-	lttng_remove_context_field(ctx, field);
-error_context:
-	lttng_ust_destroy_type(type);
-	return ret;
-}
-
-/*
- * Force a read (imply TLS fixup for dlopen) of TLS variables.
- */
-void lttng_fixup_procname_tls(void)
-{
-	asm volatile ("" : : "m" (URCU_TLS(cached_procname)[0]));
-}