ust-fd: Add close_range declaration

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

diff --git a/liblttng-ust/lttng-context-vsuid.c b/liblttng-ust/lttng-context-vsuid.c
deleted file mode 100644 (file)
index ecc239b..0000000
--- a/liblttng-ust/lttng-context-vsuid.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
- *
- * LTTng UST namespaced saved set-user ID context.
- */
-
-#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 "context-internal.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 uid_t cached_vsuid = INVALID_UID;
-
-static
-uid_t get_vsuid(void)
-{
-       uid_t vsuid;
-
-       vsuid = CMM_LOAD_SHARED(cached_vsuid);
-
-       if (caa_unlikely(vsuid == INVALID_UID)) {
-               uid_t uid, euid, suid;
-
-               if (getresuid(&uid, &euid, &suid) == 0) {
-                       vsuid = suid;
-                       CMM_STORE_SHARED(cached_vsuid, vsuid);
-               }
-       }
-
-       return vsuid;
-}
-
-/*
- * The vsuid can change on setuid, setreuid and setresuid.
- */
-void lttng_context_vsuid_reset(void)
-{
-       CMM_STORE_SHARED(cached_vsuid, INVALID_UID);
-}
-
-static
-size_t vsuid_get_size(struct lttng_ctx_field *field, size_t offset)
-{
-       size_t size = 0;
-
-       size += lib_ring_buffer_align(offset, lttng_alignof(uid_t));
-       size += sizeof(uid_t);
-       return size;
-}
-
-static
-void vsuid_record(struct lttng_ctx_field *field,
-                struct lttng_ust_lib_ring_buffer_ctx *ctx,
-                struct lttng_channel *chan)
-{
-       uid_t vsuid;
-
-       vsuid = get_vsuid();
-       lib_ring_buffer_align_ctx(ctx, lttng_alignof(vsuid));
-       chan->ops->event_write(ctx, &vsuid, sizeof(vsuid));
-}
-
-static
-void vsuid_get_value(struct lttng_ctx_field *field,
-               struct lttng_ctx_value *value)
-{
-       value->u.s64 = get_vsuid();
-}
-
-int lttng_add_vsuid_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, "vsuid")) {
-               lttng_remove_context_field(ctx, field);
-               return -EEXIST;
-       }
-       field->event_field.name = "vsuid";
-       field->event_field.type.atype = atype_integer;
-       field->event_field.type.u.integer.size = sizeof(uid_t) * CHAR_BIT;
-       field->event_field.type.u.integer.alignment = lttng_alignof(uid_t) * CHAR_BIT;
-       field->event_field.type.u.integer.signedness = lttng_is_signed_type(uid_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 = vsuid_get_size;
-       field->record = vsuid_record;
-       field->get_value = vsuid_get_value;
-       lttng_context_update(*ctx);
-       return 0;
-}