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/* sp-gjs-source.c
*
* Copyright (C) 2016 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/>.
*/
#include <signal.h>
#include <string.h>
#include "capture/sp-capture-reader.h"
#include "sources/sp-gjs-source.h"
struct _SpGjsSource
{
GObject parent_instance;
SpCaptureWriter *writer;
GArray *pids;
GArray *enabled;
};
#define ENABLE_PROFILER 0x1
#define DISABLE_PROFILER 0x0
static void source_iface_init (SpSourceInterface *iface);
G_DEFINE_TYPE_EXTENDED (SpGjsSource, sp_gjs_source, G_TYPE_OBJECT, 0,
G_IMPLEMENT_INTERFACE (SP_TYPE_SOURCE, source_iface_init))
static void
sp_gjs_source_finalize (GObject *object)
{
SpGjsSource *self = (SpGjsSource *)object;
g_clear_pointer (&self->pids, g_array_unref);
g_clear_pointer (&self->enabled, g_array_unref);
g_clear_pointer (&self->writer, sp_capture_writer_unref);
G_OBJECT_CLASS (sp_gjs_source_parent_class)->finalize (object);
}
static void
sp_gjs_source_class_init (SpGjsSourceClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = sp_gjs_source_finalize;
}
static void
sp_gjs_source_init (SpGjsSource *self)
{
self->pids = g_array_new (FALSE, FALSE, sizeof (GPid));
self->enabled = g_array_new (FALSE, FALSE, sizeof (GPid));
}
static void
sp_gjs_source_process_capture (SpGjsSource *self,
GPid pid,
const gchar *path)
{
g_autoptr(GError) error = NULL;
g_autoptr(SpCaptureReader) reader = NULL;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (self->writer != NULL);
g_assert (path != NULL);
if (!(reader = sp_capture_reader_new (path, &error)))
{
g_warning ("Failed to load capture: %s", error->message);
return;
}
if (!sp_capture_reader_splice (reader, self->writer, &error))
{
g_warning ("Failed to load capture: %s", error->message);
return;
}
}
static void
sp_gjs_source_process_captures (SpGjsSource *self)
{
guint i;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (self->writer != NULL);
for (i = 0; i < self->enabled->len; i++)
{
g_autofree gchar *filename = NULL;
g_autofree gchar *path = NULL;
GPid pid = g_array_index (self->enabled, GPid, i);
filename = g_strdup_printf ("gjs-profile-%u", (guint)pid);
path = g_build_filename (g_get_tmp_dir (), filename, NULL);
sp_gjs_source_process_capture (self, pid, path);
}
}
static void
sp_gjs_source_set_writer (SpSource *source,
SpCaptureWriter *writer)
{
SpGjsSource *self = (SpGjsSource *)source;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (writer != NULL);
self->writer = sp_capture_writer_ref (writer);
}
static gboolean
pid_is_profileable (GPid pid)
{
g_autofree gchar *path = NULL;
g_autofree gchar *contents = NULL;
const gchar *libgjs;
gsize len = 0;
g_assert (pid != -1);
/*
* Make sure this process has linked in libgjs. No sense in sending it a
* signal unless we know it can handle it.
*/
path = g_strdup_printf ("/proc/%d/maps", pid);
if (!g_file_get_contents (path, &contents, &len, NULL))
return FALSE;
if (NULL == (libgjs = strstr (contents, "libgjs."G_MODULE_SUFFIX)))
return FALSE;
return TRUE;
}
static void
sp_gjs_source_enable_pid (SpGjsSource *self,
GPid pid)
{
union sigval si;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (pid != -1);
si.sival_int = ENABLE_PROFILER;
if (0 != sigqueue (pid, SIGUSR2, si))
g_warning ("Failed to queue SIGUSR2 to pid %u", (guint)pid);
else
g_array_append_val (self->enabled, pid);
}
static void
sp_gjs_source_disable_pid (SpGjsSource *self,
GPid pid)
{
union sigval si;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (pid != -1);
si.sival_int = DISABLE_PROFILER;
if (0 != sigqueue (pid, SIGUSR2, si))
g_warning ("Failed to queue SIGUSR2 to pid %u", (guint)pid);
}
static void
sp_gjs_source_start (SpSource *source)
{
SpGjsSource *self = (SpGjsSource *)source;
guint i;
g_assert (SP_IS_GJS_SOURCE (self));
for (i = 0; i < self->pids->len; i++)
{
GPid pid = g_array_index (self->pids, GPid, i);
if (pid_is_profileable (pid))
sp_gjs_source_enable_pid (self, pid);
}
}
static void
sp_gjs_source_stop (SpSource *source)
{
SpGjsSource *self = (SpGjsSource *)source;
guint i;
g_assert (SP_IS_GJS_SOURCE (self));
for (i = 0; i < self->pids->len; i++)
{
GPid pid = g_array_index (self->pids, GPid, i);
if (pid_is_profileable (pid))
sp_gjs_source_disable_pid (self, pid);
}
sp_gjs_source_process_captures (self);
}
static void
sp_gjs_source_add_pid (SpSource *source,
GPid pid)
{
SpGjsSource *self = (SpGjsSource *)source;
g_assert (SP_IS_GJS_SOURCE (self));
g_assert (pid > -1);
g_array_append_val (self->pids, pid);
}
static void
source_iface_init (SpSourceInterface *iface)
{
iface->set_writer = sp_gjs_source_set_writer;
iface->start = sp_gjs_source_start;
iface->stop = sp_gjs_source_stop;
iface->add_pid = sp_gjs_source_add_pid;
}
SpSource *
sp_gjs_source_new (void)
{
return g_object_new (SP_TYPE_GJS_SOURCE, NULL);
}
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