Introduce exec_file_locate_attach

This commit adds a new function, exec_file_locate_attach, which works
like exec_file_attach except that, instead of a filename argument, it
takes an integer process ID and attempts to determine the executable
filename from that.

gdb/ChangeLog:

	* gdbcore.h (exec_file_locate_attach): New declaration.
	* exec.c (exec_file_locate_attach): New function, factored
	out from...
	* infcmd.c (attach_command_post_wait): ...here.

4 files changed, 47 insertions, 23 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 20b5bf1..0de7554 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2015-04-17  Gary Benson <gbenson@redhat.com>
+
+	* gdbcore.h (exec_file_locate_attach): New declaration.
+	* exec.c (exec_file_locate_attach): New function, factored
+	out from...
+	* infcmd.c (attach_command_post_wait): ...here.
+
 2015-04-17  Mike Frysinger  <vapier@gentoo.org>
 
 	* MAINTAINERS: Add myself for Blackfin/write-after-approval.
diff --git a/gdb/exec.c b/gdb/exec.c
index 44c8480..9d4ad90 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -134,6 +134,37 @@ exec_file_clear (int from_tty)
     printf_unfiltered (_("No executable file now.\n"));
 }
 
+/* See gdbcore.h.  */
+
+void
+exec_file_locate_attach (int pid, int from_tty)
+{
+  char *exec_file, *full_exec_path = NULL;
+
+  /* Do nothing if we already have an executable filename.  */
+  exec_file = (char *) get_exec_file (0);
+  if (exec_file != NULL)
+    return;
+
+  /* Try to determine a filename from the process itself.  */
+  exec_file = target_pid_to_exec_file (pid);
+  if (exec_file == NULL)
+    return;
+
+  /* It's possible we don't have a full path, but rather just a
+     filename.  Some targets, such as HP-UX, don't provide the
+     full path, sigh.
+
+     Attempt to qualify the filename against the source path.
+     (If that fails, we'll just fall back on the original
+     filename.  Not much more we can do...)  */
+  if (!source_full_path_of (exec_file, &full_exec_path))
+    full_exec_path = xstrdup (exec_file);
+
+  exec_file_attach (full_exec_path, from_tty);
+  symbol_file_add_main (full_exec_path, from_tty);
+}
+
 /* Set FILENAME as the new exec file.
 
    This function is intended to be behave essentially the same
diff --git a/gdb/gdbcore.h b/gdb/gdbcore.h
index 63a75f0..a437c8a 100644
--- a/gdb/gdbcore.h
+++ b/gdb/gdbcore.h
@@ -150,6 +150,13 @@ extern void core_file_command (char *filename, int from_tty);
 
 extern void exec_file_attach (const char *filename, int from_tty);
 
+/* If the filename of the main executable is unknown, attempt to
+   determine it.  If a filename is determined, proceed as though
+   it was just specified with the "file" command.  Do nothing if
+   the filename of the main executable is already known.  */
+
+extern void exec_file_locate_attach (int pid, int from_tty);
+
 extern void exec_file_clear (int from_tty);
 
 extern void validate_files (void);
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 6caa878..7e2484b 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -2462,8 +2462,6 @@ proceed_after_attach (int pid)
 static void
 attach_command_post_wait (char *args, int from_tty, int async_exec)
 {
-  char *exec_file;
-  char *full_exec_path = NULL;
   struct inferior *inferior;
 
   inferior = current_inferior ();
@@ -2471,27 +2469,8 @@ attach_command_post_wait (char *args, int from_tty, int async_exec)
 
   /* If no exec file is yet known, try to determine it from the
      process itself.  */
-  exec_file = (char *) get_exec_file (0);
-  if (!exec_file)
-    {
-      exec_file = target_pid_to_exec_file (ptid_get_pid (inferior_ptid));
-      if (exec_file)
-	{
-	  /* It's possible we don't have a full path, but rather just a
-	     filename.  Some targets, such as HP-UX, don't provide the
-	     full path, sigh.
-
-	     Attempt to qualify the filename against the source path.
-	     (If that fails, we'll just fall back on the original
-	     filename.  Not much more we can do...)  */
-
-	  if (!source_full_path_of (exec_file, &full_exec_path))
-	    full_exec_path = xstrdup (exec_file);
-
-	  exec_file_attach (full_exec_path, from_tty);
-	  symbol_file_add_main (full_exec_path, from_tty);
-	}
-    }
+  if (get_exec_file (0) == NULL)
+    exec_file_locate_attach (ptid_get_pid (inferior_ptid), from_tty);
   else
     {
       reopen_exec_file ();