[sysprof] libsysprof: add simple preload source
- From: Christian Hergert <chergert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [sysprof] libsysprof: add simple preload source
- Date: Fri, 13 Mar 2020 22:52:44 +0000 (UTC)
commit a70907be0ec64945987647567f0caf05a1e530db
Author: Christian Hergert <chergert redhat com>
Date: Fri Mar 13 15:50:46 2020 -0700
libsysprof: add simple preload source
This source is useful to quickly add an LD_PRELOAD to a profiler.
src/libsysprof/meson.build | 2 +
src/libsysprof/sysprof-preload-source.c | 153 ++++++++++++++++++++++++++++++++
src/libsysprof/sysprof-preload-source.h | 32 +++++++
src/libsysprof/sysprof.h | 1 +
4 files changed, 188 insertions(+)
---
diff --git a/src/libsysprof/meson.build b/src/libsysprof/meson.build
index d5603ea..6611a0d 100644
--- a/src/libsysprof/meson.build
+++ b/src/libsysprof/meson.build
@@ -20,6 +20,7 @@ libsysprof_public_sources = [
'sysprof-memprof-profile.c',
'sysprof-memprof-source.c',
'sysprof-netdev-source.c',
+ 'sysprof-preload-source.c',
'sysprof-process-model.c',
'sysprof-process-model-item.c',
'sysprof-profile.c',
@@ -51,6 +52,7 @@ libsysprof_public_headers = [
'sysprof-local-profiler.h',
'sysprof-memprof-profile.h',
'sysprof-memprof-source.h',
+ 'sysprof-preload-source.h',
'sysprof-process-model.h',
'sysprof-process-model-item.h',
'sysprof-profile.h',
diff --git a/src/libsysprof/sysprof-preload-source.c b/src/libsysprof/sysprof-preload-source.c
new file mode 100644
index 0000000..a0af7e1
--- /dev/null
+++ b/src/libsysprof/sysprof-preload-source.c
@@ -0,0 +1,153 @@
+/* sysprof-preload-source.c
+ *
+ * Copyright 2020 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define G_LOG_DOMAIN "sysprof-preload-source.h"
+
+#include "config.h"
+
+#include "sysprof-preload-source.h"
+
+struct _SysprofPreloadSource
+{
+ GObject parent_instance;
+ gchar *preload;
+};
+
+enum {
+ PROP_0,
+ PROP_PRELOAD,
+ N_PROPS
+};
+
+static void
+sysprof_preload_source_modify_spawn (SysprofSource *source,
+ SysprofSpawnable *spawnable)
+{
+ SysprofPreloadSource *self = (SysprofPreloadSource *)source;
+
+ g_assert (SYSPROF_IS_SOURCE (self));
+ g_assert (SYSPROF_IS_SPAWNABLE (spawnable));
+
+#ifdef __linux__
+ if (self->preload)
+ {
+ g_autofree gchar *freeme = NULL;
+ const gchar *ld_preload;
+
+ if (!(ld_preload = sysprof_spawnable_getenv (spawnable, "LD_PRELOAD")))
+ sysprof_spawnable_setenv (spawnable, "LD_PRELOAD", self->preload);
+ else
+ sysprof_spawnable_setenv (spawnable,
+ "LD_PRELOAD",
+ (freeme = g_strdup_printf ("%s,%s", self->preload, ld_preload)));
+ }
+#endif
+}
+
+static void
+sysprof_preload_source_stop (SysprofSource *source)
+{
+ sysprof_source_emit_finished (source);
+}
+
+static void
+source_iface_init (SysprofSourceInterface *iface)
+{
+ iface->modify_spawn = sysprof_preload_source_modify_spawn;
+ iface->stop = sysprof_preload_source_stop;
+}
+
+G_DEFINE_TYPE_WITH_CODE (SysprofPreloadSource, sysprof_preload_source, G_TYPE_OBJECT,
+ G_IMPLEMENT_INTERFACE (SYSPROF_TYPE_SOURCE, source_iface_init))
+
+static GParamSpec *properties [N_PROPS];
+
+static void
+sysprof_preload_source_finalize (GObject *object)
+{
+ SysprofPreloadSource *self = (SysprofPreloadSource *)object;
+
+ g_clear_pointer (&self->preload, g_free);
+
+ G_OBJECT_CLASS (sysprof_preload_source_parent_class)->finalize (object);
+}
+
+static void
+sysprof_preload_source_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ SysprofPreloadSource *self = SYSPROF_PRELOAD_SOURCE (object);
+
+ switch (prop_id)
+ {
+ case PROP_PRELOAD:
+ g_value_set_string (value, self->preload);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+sysprof_preload_source_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ SysprofPreloadSource *self = SYSPROF_PRELOAD_SOURCE (object);
+
+ switch (prop_id)
+ {
+ case PROP_PRELOAD:
+ g_free (self->preload);
+ self->preload = g_value_dup_string (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+sysprof_preload_source_class_init (SysprofPreloadSourceClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->finalize = sysprof_preload_source_finalize;
+ object_class->get_property = sysprof_preload_source_get_property;
+ object_class->set_property = sysprof_preload_source_set_property;
+
+ properties [PROP_PRELOAD] =
+ g_param_spec_string ("preload",
+ "Preload",
+ "The preload to load into the process",
+ NULL,
+ (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_properties (object_class, N_PROPS, properties);
+}
+
+static void
+sysprof_preload_source_init (SysprofPreloadSource *self)
+{
+}
diff --git a/src/libsysprof/sysprof-preload-source.h b/src/libsysprof/sysprof-preload-source.h
new file mode 100644
index 0000000..625ca15
--- /dev/null
+++ b/src/libsysprof/sysprof-preload-source.h
@@ -0,0 +1,32 @@
+/* sysprof-preload-source.h
+ *
+ * Copyright 2020 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "sysprof-source.h"
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_PRELOAD_SOURCE (sysprof_preload_source_get_type())
+
+SYSPROF_AVAILABLE_IN_3_38
+G_DECLARE_FINAL_TYPE (SysprofPreloadSource, sysprof_preload_source, SYSPROF, PRELOAD_SOURCE, GObject)
+
+G_END_DECLS
diff --git a/src/libsysprof/sysprof.h b/src/libsysprof/sysprof.h
index a37d7ed..c682f2f 100644
--- a/src/libsysprof/sysprof.h
+++ b/src/libsysprof/sysprof.h
@@ -40,6 +40,7 @@ G_BEGIN_DECLS
# include "sysprof-memprof-profile.h"
# include "sysprof-memprof-source.h"
# include "sysprof-netdev-source.h"
+# include "sysprof-preload-source.h"
# include "sysprof-process-model-item.h"
# include "sysprof-process-model.h"
# include "sysprof-profile.h"
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