*** empty log message ***

[deliverable/binutils-gdb.git] / gdb / inflow.c

diff --git a/gdb/inflow.c b/gdb/inflow.c
index 83a0c9d828155cce4704383ebbcc18275d606fab..6a775316c84b8a7a69e5b5f504ea823241c41f59 100644 (file)
--- a/gdb/inflow.c
+++ b/gdb/inflow.c
@@ -1,13 +1,13 @@
 /* Low level interface to ptrace, for GDB when running under Unix.
    Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
-   1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
    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 2 of the License, or
+   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,
@@ -16,9 +16,7 @@
    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, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "frame.h"
@@ -100,6 +98,24 @@ static const char *inferior_thisrun_terminal;
 
 int terminal_is_ours;
 
+#ifdef PROCESS_GROUP_TYPE
+static PROCESS_GROUP_TYPE
+gdb_getpgrp (void)
+{
+  int process_group = -1;
+#ifdef HAVE_TERMIOS
+  process_group = tcgetpgrp (0);
+#endif
+#ifdef HAVE_TERMIO
+  process_group = getpgrp ();
+#endif
+#ifdef HAVE_SGTTY
+  ioctl (0, TIOCGPGRP, &process_group);
+#endif
+  return process_group;
+}
+#endif
+
 enum
   {
     yes, no, have_not_checked
@@ -134,14 +150,8 @@ gdb_has_a_terminal (void)
          if (our_ttystate != NULL)
            {
              gdb_has_a_terminal_flag = yes;
-#ifdef HAVE_TERMIOS
-             our_process_group = tcgetpgrp (0);
-#endif
-#ifdef HAVE_TERMIO
-             our_process_group = getpgrp ();
-#endif
-#ifdef HAVE_SGTTY
-             ioctl (0, TIOCGPGRP, &our_process_group);
+#ifdef PROCESS_GROUP_TYPE
+             our_process_group = gdb_getpgrp ();
 #endif
            }
        }
@@ -341,14 +351,13 @@ terminal_ours_1 (int output_only)
       if (inferior_ttystate)
        xfree (inferior_ttystate);
       inferior_ttystate = serial_get_tty_state (stdin_serial);
-#ifdef HAVE_TERMIOS
-      inferior_process_group = tcgetpgrp (0);
-#endif
-#ifdef HAVE_TERMIO
-      inferior_process_group = getpgrp ();
-#endif
-#ifdef HAVE_SGTTY
-      ioctl (0, TIOCGPGRP, &inferior_process_group);
+
+#ifdef PROCESS_GROUP_TYPE
+      if (!attach_flag)
+       /* If setpgrp failed in terminal_inferior, this would give us
+          our process group instead of the inferior's.  See
+          terminal_inferior for details.  */
+       inferior_process_group = gdb_getpgrp ();
 #endif
 
       /* Here we used to set ICANON in our ttystate, but I believe this
@@ -410,8 +419,6 @@ terminal_ours_1 (int output_only)
       result = fcntl (0, F_SETFL, tflags_ours);
       result = fcntl (0, F_SETFL, tflags_ours);
 #endif
-
-      result = result;         /* lint */
     }
 }
 
@@ -561,6 +568,16 @@ new_tty (void)
       close (2);
       dup (tty);
     }
+
+#ifdef TIOCSCTTY
+  /* Make tty our new controlling terminal.  */
+  if (ioctl (tty, TIOCSCTTY, 0) == -1)
+    /* Mention GDB in warning because it will appear in the inferior's
+       terminal instead of GDB's.  */
+    warning ("GDB: Failed to set controlling terminal: %s",
+            safe_strerror (errno));
+#endif
+
   if (tty > 2)
     close (tty);
 #endif /* !go32 && !win32 */
@@ -588,10 +605,7 @@ kill_command (char *arg, int from_tty)
   if (target_has_stack)
     {
       printf_filtered (_("In %s,\n"), target_longname);
-      if (deprecated_selected_frame == NULL)
-       fputs_filtered ("No selected stack frame.\n", gdb_stdout);
-      else
-       print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+      print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
     }
   bfd_cache_close_all ();
 }
@@ -690,6 +704,33 @@ clear_sigio_trap (void)
 #endif /* No SIGIO.  */
 \f
 
+/* Create a new session if the inferior will run in a different tty.
+   A session is UNIX's way of grouping processes that share a controlling
+   terminal, so a new one is needed if the inferior terminal will be
+   different from GDB's.
+
+   Returns the session id of the new session, 0 if no session was created
+   or -1 if an error occurred.  */
+pid_t
+create_tty_session (void)
+{
+#ifdef HAVE_SETSID
+  pid_t ret;
+
+  if (!job_control || inferior_thisrun_terminal == 0)
+    return 0;
+
+  ret = setsid ();
+  if (ret == -1)
+    warning ("Failed to create new terminal session: setsid: %s",
+            safe_strerror (errno));
+
+  return ret;
+#else
+  return 0;
+#endif /* HAVE_SETSID */
+}
+
 /* This is here because this is where we figure out whether we (probably)
    have job control.  Just using job_control only does part of it because
    setpgid or setpgrp might not exist on a system without job control.