1 files changed, 119 insertions, 0 deletions
diff --git a/gdbserver/fork-child.cc b/gdbserver/fork-child.cc
new file mode 100644
index 0000000..7a71ec0
--- /dev/null
+++ b/gdbserver/fork-child.cc
@@ -0,0 +1,119 @@
+/* Fork a Unix child process, and set up to debug it, for GDBserver.
+   Copyright (C) 1989-2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 "server.h"
+#include "gdbsupport/job-control.h"
+#include "nat/fork-inferior.h"
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
+#ifdef SIGTTOU
+/* A file descriptor for the controlling terminal.  */
+static int terminal_fd;
+
+/* TERMINAL_FD's original foreground group.  */
+static pid_t old_foreground_pgrp;
+
+/* Hand back terminal ownership to the original foreground group.  */
+
+static void
+restore_old_foreground_pgrp (void)
+{
+  tcsetpgrp (terminal_fd, old_foreground_pgrp);
+}
+#endif
+
+/* See nat/fork-inferior.h.  */
+
+void
+prefork_hook (const char *args)
+{
+  client_state &cs = get_client_state ();
+  if (debug_threads)
+    {
+      debug_printf ("args: %s\n", args);
+      debug_flush ();
+    }
+
+#ifdef SIGTTOU
+  signal (SIGTTOU, SIG_DFL);
+  signal (SIGTTIN, SIG_DFL);
+#endif
+
+  /* Clear this so the backend doesn't get confused, thinking
+     CONT_THREAD died, and it needs to resume all threads.  */
+  cs.cont_thread = null_ptid;
+}
+
+/* See nat/fork-inferior.h.  */
+
+void
+postfork_hook (pid_t pid)
+{
+}
+
+/* See nat/fork-inferior.h.  */
+
+void
+postfork_child_hook ()
+{
+  /* This is set to the result of setpgrp, which if vforked, will be
+     visible to you in the parent process.  It's only used by humans
+     for debugging.  */
+  static int debug_setpgrp = 657473;
+
+  debug_setpgrp = gdb_setpgid ();
+  if (debug_setpgrp == -1)
+    perror (_("setpgrp failed in child"));
+}
+
+/* See nat/fork-inferior.h.  */
+
+void
+gdb_flush_out_err ()
+{
+  fflush (stdout);
+  fflush (stderr);
+}
+
+/* See server.h.  */
+
+void
+post_fork_inferior (int pid, const char *program)
+{
+  client_state &cs = get_client_state ();
+#ifdef SIGTTOU
+  signal (SIGTTOU, SIG_IGN);
+  signal (SIGTTIN, SIG_IGN);
+  terminal_fd = fileno (stderr);
+  old_foreground_pgrp = tcgetpgrp (terminal_fd);
+  tcsetpgrp (terminal_fd, pid);
+  atexit (restore_old_foreground_pgrp);
+#endif
+
+  startup_inferior (the_target, pid,
+		    START_INFERIOR_TRAPS_EXPECTED,
+		    &cs.last_status, &cs.last_ptid);
+  current_thread->last_resume_kind = resume_stop;
+  current_thread->last_status = cs.last_status;
+  signal_pid = pid;
+  target_post_create_inferior ();
+  fprintf (stderr, "Process %s created; pid = %d\n", program, pid);
+  fflush (stderr);
+}