ust-fd: Add close_range declaration

[lttng-ust.git] / liblttng-ust / lttng-context-vsgid.c

diff --git a/liblttng-ust/lttng-context-vsgid.c b/liblttng-ust/lttng-context-vsgid.c
deleted file mode 100644 (file)
index 685264b..0000000
--- a/liblttng-ust/lttng-context-vsgid.c
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * lttng-context-vsgid.c
- *
- * LTTng UST namespaced saved set-group ID context.
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *               2019 Michael Jeanson <mjeanson@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#define _LGPL_SOURCE
-#include <stddef.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <lttng/ringbuffer-config.h>
-#include "creds.h"
-
-
-/*
- * At the kernel level, user IDs and group IDs are a per-thread attribute.
- * However, POSIX requires that all threads in a process share the same
- * credentials. The NPTL threading implementation handles the POSIX
- * requirements by providing wrapper functions for the various system calls
- * that change process UIDs and GIDs. These wrapper functions (including those
- * for setreuid() and setregid()) employ a signal-based technique to ensure
- * that when one thread changes credentials, all of the other threads in the
- * process also change their credentials.
- */
-
-/*
- * We cache the result to ensure we don't trigger a system call for
- * each event. User / group IDs are global to the process.
- */
-static gid_t cached_vsgid = INVALID_GID;
-
-static
-gid_t get_vsgid(void)
-{
-       gid_t vsgid;
-
-       vsgid = CMM_LOAD_SHARED(cached_vsgid);
-
-       if (caa_unlikely(vsgid == INVALID_GID)) {
-               gid_t gid, egid, sgid;
-
-               if (getresgid(&gid, &egid, &sgid) == 0) {
-                       vsgid = sgid;
-                       CMM_STORE_SHARED(cached_vsgid, vsgid);
-               }
-       }
-
-       return vsgid;
-}
-
-/*
- * The vsgid can change on setuid, setreuid and setresuid.
- */
-void lttng_context_vsgid_reset(void)
-{
-       CMM_STORE_SHARED(cached_vsgid, INVALID_GID);
-}
-
-static
-size_t vsgid_get_size(struct lttng_ctx_field *field, size_t offset)
-{
-       size_t size = 0;
-
-       size += lib_ring_buffer_align(offset, lttng_alignof(gid_t));
-       size += sizeof(gid_t);
-       return size;
-}
-
-static
-void vsgid_record(struct lttng_ctx_field *field,
-                struct lttng_ust_lib_ring_buffer_ctx *ctx,
-                struct lttng_channel *chan)
-{
-       gid_t vsgid;
-
-       vsgid = get_vsgid();
-       lib_ring_buffer_align_ctx(ctx, lttng_alignof(vsgid));
-       chan->ops->event_write(ctx, &vsgid, sizeof(vsgid));
-}
-
-static
-void vsgid_get_value(struct lttng_ctx_field *field,
-               struct lttng_ctx_value *value)
-{
-       value->u.s64 = get_vsgid();
-}
-
-int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx)
-{
-       struct lttng_ctx_field *field;
-
-       field = lttng_append_context(ctx);
-       if (!field)
-               return -ENOMEM;
-       if (lttng_find_context(*ctx, "vsgid")) {
-               lttng_remove_context_field(ctx, field);
-               return -EEXIST;
-       }
-       field->event_field.name = "vsgid";
-       field->event_field.type.atype = atype_integer;
-       field->event_field.type.u.integer.size = sizeof(gid_t) * CHAR_BIT;
-       field->event_field.type.u.integer.alignment = lttng_alignof(gid_t) * CHAR_BIT;
-       field->event_field.type.u.integer.signedness = lttng_is_signed_type(gid_t);
-       field->event_field.type.u.integer.reverse_byte_order = 0;
-       field->event_field.type.u.integer.base = 10;
-       field->event_field.type.u.integer.encoding = lttng_encode_none;
-       field->get_size = vsgid_get_size;
-       field->record = vsgid_record;
-       field->get_value = vsgid_get_value;
-       lttng_context_update(*ctx);
-       return 0;
-}