* inf-child.c (inf_child_follow_fork) New parameter

detach_fork.
	* inf-ptrace.c (inf_ptrace_follow_fork): Likewise.
	* inf-ttrace.c (inf_ttrace_follow_fork): Likewise.
	* inferior.h (detach_fork): Remove.
	* infrun.c (detach_fork): Adjust comment and make it
	static.
	(follow_fork): Pass detach_fork parameter to
	target_follow_fork.
	* linux-nat.c (linux_child_follow_fork): New parameter
	detach_fork.
	* target.c (target_follow_fork): New parameter detach_fork.
	Pass detach_fork as parameter and print its value.
	* target.h (struct target_ops) <to_follow_fork>: New int
	parameter.
	(target_follow_fork): New parameter detach_fork.

gdb/ChangeLog

@@ -1,3 +1,22 @@
+2013-09-03  Luis Machado  <lgustavo@codesourcery.com>
+
+	* inf-child.c (inf_child_follow_fork) New parameter
+	detach_fork.
+	* inf-ptrace.c (inf_ptrace_follow_fork): Likewise.
+	* inf-ttrace.c (inf_ttrace_follow_fork): Likewise.
+	* inferior.h (detach_fork): Remove.
+	* infrun.c (detach_fork): Adjust comment and make it
+	static.
+	(follow_fork): Pass detach_fork parameter to
+	target_follow_fork.
+	* linux-nat.c (linux_child_follow_fork): New parameter
+	detach_fork.
+	* target.c (target_follow_fork): New parameter detach_fork.
+	Pass detach_fork as parameter and print its value.
+	* target.h (struct target_ops) <to_follow_fork>: New int
+	parameter.
+	(target_follow_fork): New parameter detach_fork.
+
 2013-09-03  Joel Brobecker  <brobecker@adacore.com>
 
 	* solib-ia64-hpux.c (ia64_hpux_relocate_section_addresses):

gdb/inf-child.c

@@ -118,7 +118,8 @@ inf_child_post_startup_inferior (ptid_t ptid)
 }
 
 static int
-inf_child_follow_fork (struct target_ops *ops, int follow_child)
+inf_child_follow_fork (struct target_ops *ops, int follow_child,
+		       int detach_fork)
 {
   /* This version of Unix doesn't support following fork or vfork
      events.  */

gdb/inf-ptrace.c

@@ -40,7 +40,8 @@
 #ifdef PT_GET_PROCESS_STATE
 
 static int
-inf_ptrace_follow_fork (struct target_ops *ops, int follow_child)
+inf_ptrace_follow_fork (struct target_ops *ops, int follow_child,
+			int detach_fork)
 {
   pid_t pid, fpid;
   ptrace_state_t pe;

gdb/inf-ttrace.c

@@ -409,7 +409,8 @@ inf_ttrace_stopped_by_watchpoint (void)
 static pid_t inf_ttrace_vfork_ppid = -1;
 
 static int
-inf_ttrace_follow_fork (struct target_ops *ops, int follow_child)
+inf_ttrace_follow_fork (struct target_ops *ops, int follow_child,
+			int detach_fork)
 {
   pid_t pid, fpid;
   lwpid_t lwpid, flwpid;

gdb/inferior.h

@@ -119,11 +119,6 @@ extern int step_stop_if_no_debug;
    are kept running freely.  */
 extern int non_stop;
 
-/* If set (default), when following a fork, GDB will detach from one
-   the fork branches, child or parent.  Exactly which branch is
-   detached depends on 'set follow-fork-mode' setting.  */
-extern int detach_fork;
-
 /* When set (default), the target should attempt to disable the operating
    system's address space randomization feature when starting an inferior.  */
 extern int disable_randomization;

gdb/infrun.c

@@ -132,8 +132,12 @@ int sync_execution = 0;
 
 static ptid_t previous_inferior_ptid;
 
-/* Default behavior is to detach newly forked processes (legacy).  */
-int detach_fork = 1;
+/* If set (default for legacy reasons), when following a fork, GDB
+   will detach from one of the fork branches, child or parent.
+   Exactly which branch is detached depends on 'set follow-fork-mode'
+   setting.  */
+
+static int detach_fork = 1;
 
 int debug_displaced = 0;
 static void
@@ -497,7 +501,7 @@ follow_fork (void)
 
 	/* Tell the target to do whatever is necessary to follow
 	   either parent or child.  */
-	if (target_follow_fork (follow_child))
+	if (target_follow_fork (follow_child, detach_fork))
 	  {
 	    /* Target refused to follow, or there's some other reason
 	       we shouldn't resume.  */

gdb/linux-nat.c

@@ -376,7 +376,8 @@ delete_lwp_cleanup (void *lp_voidp)
 }
 
 static int
-linux_child_follow_fork (struct target_ops *ops, int follow_child)
+linux_child_follow_fork (struct target_ops *ops, int follow_child,
+			 int detach_fork)
 {
   int has_vforked;
   int parent_pid, child_pid;

gdb/target.c

@@ -2811,7 +2811,7 @@ target_program_signals (int numsigs, unsigned char *program_signals)
    follow forks.  */
 
 int
-target_follow_fork (int follow_child)
+target_follow_fork (int follow_child, int detach_fork)
 {
   struct target_ops *t;
 
@@ -2819,11 +2819,12 @@ target_follow_fork (int follow_child)
     {
       if (t->to_follow_fork != NULL)
 	{
-	  int retval = t->to_follow_fork (t, follow_child);
+	  int retval = t->to_follow_fork (t, follow_child, detach_fork);
 
 	  if (targetdebug)
-	    fprintf_unfiltered (gdb_stdlog, "target_follow_fork (%d) = %d\n",
-				follow_child, retval);
+	    fprintf_unfiltered (gdb_stdlog,
+				"target_follow_fork (%d, %d) = %d\n",
+				follow_child, detach_fork, retval);
 	  return retval;
 	}
     }

gdb/target.h

@@ -440,7 +440,7 @@ struct target_ops
     int (*to_remove_fork_catchpoint) (int);
     int (*to_insert_vfork_catchpoint) (int);
     int (*to_remove_vfork_catchpoint) (int);
-    int (*to_follow_fork) (struct target_ops *, int);
+    int (*to_follow_fork) (struct target_ops *, int, int);
     int (*to_insert_exec_catchpoint) (int);
     int (*to_remove_exec_catchpoint) (int);
     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
@@ -1235,7 +1235,7 @@ void target_create_inferior (char *exec_file, char *args,
    This function returns 1 if the inferior should not be resumed
    (i.e. there is another event pending).  */
 
-int target_follow_fork (int follow_child);
+int target_follow_fork (int follow_child, int detach_fork);
 
 /* On some targets, we can catch an inferior exec event when it
    occurs.  These functions insert/remove an already-created