[sysprof] tracefd: give memfd a descriptive name

[Christian Hergert <chergert src gnome org>]

commit 5dbb486512036b963a2c35a7b237e48dda1a9ace
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jun 12 11:14:21 2019 -0700

    tracefd: give memfd a descriptive name
    
    This makes it easier to track down from /proc/$pid/fd/.

 src/libsysprof/sysprof-tracefd-source.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/libsysprof/sysprof-tracefd-source.c b/src/libsysprof/sysprof-tracefd-source.c
index 31197c7..af5e90e 100644
--- a/src/libsysprof/sysprof-tracefd-source.c
+++ b/src/libsysprof/sysprof-tracefd-source.c
@@ -168,6 +168,7 @@ sysprof_tracefd_source_modify_spawn (SysprofSource    *source,
 {
   SysprofTracefdSource *self = (SysprofTracefdSource *)source;
   SysprofTracefdSourcePrivate *priv = sysprof_tracefd_source_get_instance_private (self);
+  g_autofree gchar *name = NULL;
   g_autofree gchar *fdstr = NULL;
   gint dest_fd;
   gint fd;
@@ -176,7 +177,9 @@ sysprof_tracefd_source_modify_spawn (SysprofSource    *source,
   g_assert (SYSPROF_IS_SPAWNABLE (spawnable));
   g_assert (priv->tracefd == -1);
 
-  if (-1 == (fd = sysprof_memfd_create ("[sysprof-proxy-capture]")))
+  name = g_strdup_printf ("[sysprof-tracefd:%s]", priv->envvar);
+
+  if (-1 == (fd = sysprof_memfd_create (name)))
     {
       g_warning ("Failed to create FD for tracefd capture: %s",
                  g_strerror (errno));