mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2026-05-18 05:48:11 +02:00
7df0229c62
It's error prone to include the header and trying not to use it. Don't include <jansson.h>. Instead, redefine our nm variants of everything. Note that we only redefine stuff that is in public headers (like "json_t" typedef). libjansson anyway must not change the struct layout and the like, without breaking all applications. That is because the non-opaque code from the header anyway is part of the applications that include it. Later we will add additional unit test that checks that our redefinition matches to what we had at compile time.
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: LGPL-2.1+
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/*
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* Copyright (C) 2017, 2018 Red Hat, Inc.
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*/
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#include "nm-default.h"
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#include "nm-json.h"
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#include <dlfcn.h>
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typedef struct {
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NMJsonVt vt;
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void *dl_handle;
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} NMJsonVtInternal;
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static NMJsonVtInternal *
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_nm_json_vt_internal_load (void)
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{
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NMJsonVtInternal *v;
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void *handle = NULL;
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int mode;
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v = g_new0 (NMJsonVtInternal, 1);
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#ifndef JANSSON_SONAME
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#define JANSSON_SONAME ""
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#endif
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mode = RTLD_LAZY | RTLD_LOCAL | RTLD_NODELETE | RTLD_DEEPBIND;
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#if defined (ASAN_BUILD)
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/* Address sanitizer is incompatible with RTLD_DEEPBIND. */
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mode &= ~RTLD_DEEPBIND;
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#endif
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if (strlen (JANSSON_SONAME) > 0)
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handle = dlopen (JANSSON_SONAME, mode);
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if (!handle)
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return v;
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#define TRY_BIND_SYMBOL(symbol) \
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G_STMT_START { \
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void *_sym = dlsym (handle, #symbol); \
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\
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if (!_sym) \
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goto fail_symbol; \
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v->vt.nm_ ## symbol = _sym; \
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} G_STMT_END
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TRY_BIND_SYMBOL (json_array);
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TRY_BIND_SYMBOL (json_array_append_new);
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TRY_BIND_SYMBOL (json_array_get);
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TRY_BIND_SYMBOL (json_array_size);
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TRY_BIND_SYMBOL (json_delete);
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TRY_BIND_SYMBOL (json_dumps);
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TRY_BIND_SYMBOL (json_false);
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TRY_BIND_SYMBOL (json_integer);
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TRY_BIND_SYMBOL (json_integer_value);
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TRY_BIND_SYMBOL (json_loads);
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TRY_BIND_SYMBOL (json_object);
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TRY_BIND_SYMBOL (json_object_del);
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TRY_BIND_SYMBOL (json_object_get);
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TRY_BIND_SYMBOL (json_object_iter);
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TRY_BIND_SYMBOL (json_object_iter_key);
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TRY_BIND_SYMBOL (json_object_iter_next);
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TRY_BIND_SYMBOL (json_object_iter_value);
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TRY_BIND_SYMBOL (json_object_key_to_iter);
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TRY_BIND_SYMBOL (json_object_set_new);
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TRY_BIND_SYMBOL (json_object_size);
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TRY_BIND_SYMBOL (json_string);
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TRY_BIND_SYMBOL (json_string_value);
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TRY_BIND_SYMBOL (json_true);
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v->vt.loaded = TRUE;
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v->dl_handle = handle;
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return v;
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fail_symbol:
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dlclose (&handle);
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*v = (NMJsonVtInternal) { };
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return v;
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}
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const NMJsonVt *_nm_json_vt_ptr = NULL;
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const NMJsonVt *
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_nm_json_vt_init (void)
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{
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NMJsonVtInternal *v;
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again:
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v = g_atomic_pointer_get ((gpointer *) &_nm_json_vt_ptr);
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if (G_UNLIKELY (!v)) {
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v = _nm_json_vt_internal_load ();
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if (!g_atomic_pointer_compare_and_exchange ((gpointer *) &_nm_json_vt_ptr, NULL, v)) {
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if (v->dl_handle)
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dlclose (v->dl_handle);
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g_free (v);
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goto again;
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}
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/* we transfer ownership. */
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}
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nm_assert (v && v == g_atomic_pointer_get ((gpointer *) &_nm_json_vt_ptr));
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return &v->vt;
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}
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const NMJsonVt *
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nmtst_json_vt_reset (gboolean loaded)
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{
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NMJsonVtInternal *v_old;
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NMJsonVtInternal *v;
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v_old = g_atomic_pointer_get ((gpointer *) &_nm_json_vt_ptr);
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if (!loaded) {
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/* load a fake instance for testing. */
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v = g_new0 (NMJsonVtInternal, 1);
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} else
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v = _nm_json_vt_internal_load ();
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if (!g_atomic_pointer_compare_and_exchange ((gpointer *) &_nm_json_vt_ptr, v_old, v))
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g_assert_not_reached ();
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if (v_old) {
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if (v_old->dl_handle)
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dlclose (v_old->dl_handle);
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g_free ((gpointer *) v_old);
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}
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return v->vt.loaded ? &v->vt : NULL;
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}
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