[sysprof] tools/sysprof-agent: handle SIGINT like we do for sysprof-cli

[Christian Hergert <chergert src gnome org>]

commit 1a8a9adc97117f01197713be3254eaf42c4a759d
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 1 10:15:36 2022 -0700

    tools/sysprof-agent: handle SIGINT like we do for sysprof-cli
    
    This just forces the profiler to exit, but lets subsequent ^C usage to
    actually exit the program.

 src/tools/sysprof-agent.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
---
diff --git a/src/tools/sysprof-agent.c b/src/tools/sysprof-agent.c
index 4e080404..b29c20f5 100644
--- a/src/tools/sysprof-agent.c
+++ b/src/tools/sysprof-agent.c
@@ -412,6 +412,20 @@ create_connection (GIOStream  *stream,
   return ret;
 }
 
+static gboolean
+sigint_handler (gpointer user_data)
+{
+  SysprofProfiler *profiler = user_data;
+
+  g_assert (SYSPROF_IS_PROFILER (profiler));
+
+  g_printerr ("\n"
+              "Profiler stopped, extracting symbols and appending to capture.\n"
+              "Press ^C again to force exit.\n");
+  sysprof_profiler_stop (profiler);
+  return G_SOURCE_REMOVE;
+}
+
 int
 main (int   argc,
       char *argv[])
@@ -606,6 +620,11 @@ main (int   argc,
                     G_CALLBACK (subprocess_finished_cb),
                     NULL);
 
+  /* SIGINT (keyboard ^C) should stop the profiler and append symbols
+   * to the SysprofCaptureWriter.
+   */
+  g_unix_signal_add (SIGINT, sigint_handler, profiler);
+
   /* Start the profiler */
   sysprof_profiler_start (profiler);