Hi,

This is a patch to add -file-list-exec-source-file to GDB. The command
returns to the client the absolute path and line number of the current 
executable. It is a replacement for the old way of getting the line 
and file using annotations 1 or 2. It is nice because the client doesn't 
have to call the -interpreter-exec command and parse the output of the CLI.

I ran the testsuite and there were no errors. I tested the feature from
GDB when there was not an program being debugged and when GDB had to
find the main file ( before running the exe ). 
Both of these cases worked properly.

I tested it on:
uname -a='Linux 2.4.18 #2 Mon Nov 4 18:23:35 EST 2002 i686 unknown'
gdb -v|tail -n1='This GDB was configured as "i386-linux".'

This patch can be applied from src/gdb using patch -p1.

I added a file called mi-cmd-file.c. I was following the pattern created
by the designers of GDB/MI. I was imagining that all of the
unimplemented function -file will go in it when they are ready.
The file is attached.

Index: gdb/Makefile.in
===================================================================
RCS file: /cvs/src/src/gdb/Makefile.in,v
retrieving revision 1.328
diff -c -r1.328 Makefile.in
*** gdb/Makefile.in	7 Feb 2003 05:33:44 -0000	1.328
--- gdb/Makefile.in	10 Feb 2003 20:51:47 -0000
***************
*** 168,181 ****
  SUBDIR_MI_OBS = \
  	mi-out.o mi-console.o \
  	mi-cmds.o mi-cmd-env.o mi-cmd-var.o mi-cmd-break.o mi-cmd-stack.o \
! 	mi-cmd-disas.o \
  	mi-interp.o \
  	mi-main.o mi-parse.o mi-getopt.o
  SUBDIR_MI_SRCS = \
  	mi/mi-out.c mi/mi-console.c \
  	mi/mi-cmds.c mi/mi-cmd-env.c \
  	mi/mi-cmd-var.c mi/mi-cmd-break.c mi/mi-cmd-stack.c \
! 	mi/mi-cmd-disas.c \
  	mi/mi-interp.c \
  	mi/mi-main.c mi/mi-parse.c mi/mi-getopt.c
  SUBDIR_MI_DEPS =
--- 168,181 ----
  SUBDIR_MI_OBS = \
  	mi-out.o mi-console.o \
  	mi-cmds.o mi-cmd-env.o mi-cmd-var.o mi-cmd-break.o mi-cmd-stack.o \
! 	mi-cmd-file.o mi-cmd-disas.o \
  	mi-interp.o \
  	mi-main.o mi-parse.o mi-getopt.o
  SUBDIR_MI_SRCS = \
  	mi/mi-out.c mi/mi-console.c \
  	mi/mi-cmds.c mi/mi-cmd-env.c \
  	mi/mi-cmd-var.c mi/mi-cmd-break.c mi/mi-cmd-stack.c \
! 	mi/mi-cmd-file.c mi/mi-cmd-disas.c \
  	mi/mi-interp.c \
  	mi/mi-main.c mi/mi-parse.c mi/mi-getopt.c
  SUBDIR_MI_DEPS =
***************
*** 2494,2499 ****
--- 2494,2503 ----
  	$(ui_out_h) $(mi_out_h) $(breakpoint_h) $(gdb_string_h) \
  	$(mi_getopt_h) $(gdb_events_h) $(gdb_h)
  	$(CC) -c $(INTERNAL_CFLAGS) $(srcdir)/mi/mi-cmd-break.c
+ mi-cmd-file.o: $(srcdir)/mi/mi-cmd-file.c $(defs_h) $(mi_cmds_h) \
+ 	$(ui_out_h) $(mi_out_h) $(breakpoint_h) $(gdb_string_h) \
+ 	$(mi_getopt_h) $(gdb_events_h) $(gdb_h)
+ 	$(CC) -c $(INTERNAL_CFLAGS) $(srcdir)/mi/mi-cmd-file.c
  mi-cmd-disas.o: $(srcdir)/mi/mi-cmd-disas.c $(defs_h) $(target_h) $(value_h) \
  	$(mi_cmds_h) $(mi_getopt_h) $(ui_out_h) $(gdb_string_h) $(disasm_h)
  	$(CC) -c $(INTERNAL_CFLAGS) $(srcdir)/mi/mi-cmd-disas.c
Index: gdb/mi/ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/mi/ChangeLog,v
retrieving revision 1.92
diff -c -r1.92 ChangeLog
*** gdb/mi/ChangeLog	9 Feb 2003 10:47:37 -0000	1.92
--- gdb/mi/ChangeLog	10 Feb 2003 20:51:51 -0000
***************
*** 1,3 ****
--- 1,10 ----
+ 2003-02-10  Bob Rossi  <bob_rossi@cox.net>
+ 
+ 	* mi-cmd-file.c: added file to implement mi file commands.
+     * mi-cmds.c: Add -file-list-exec-source-file command.
+     * mi-cmds.h: Add -file-list-exec-source-file to proto list.
+     * gdbmi.texinfo: Document -file-list-exec-source-file.
+ 
  2003-02-09  Andrew Cagney  <ac131313@redhat.com>
  
  	* mi-interp.c (mi_remove_notify_hooks): Convert function
Index: gdb/mi/gdbmi.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/mi/gdbmi.texinfo,v
retrieving revision 1.33
diff -c -r1.33 gdbmi.texinfo
*** gdb/mi/gdbmi.texinfo	4 Feb 2003 18:41:29 -0000	1.33
--- gdb/mi/gdbmi.texinfo	10 Feb 2003 20:51:55 -0000
***************
*** 2340,2345 ****
--- 2340,2355 ----
  @subsubheading Example
  N.A.
  
+ @subheading The @code{-file-list-exec-source-file} Command
+ @findex -file-list-exec-source-file
+ 
+ @subsubheading Synopsis
+ 
+ @example
+  -file-list-exec-source-file
+ @end example
+ 
+ List the current source file and line for the current executable.
  
  @subheading The @code{-file-list-exec-source-files} Command
  @findex -file-list-exec-source-files
Index: gdb/mi/mi-cmds.c
===================================================================
RCS file: /cvs/src/src/gdb/mi/mi-cmds.c,v
retrieving revision 1.10
diff -c -r1.10 mi-cmds.c
*** gdb/mi/mi-cmds.c	6 Feb 2003 01:19:12 -0000	1.10
--- gdb/mi/mi-cmds.c	10 Feb 2003 20:51:55 -0000
***************
*** 80,85 ****
--- 80,86 ----
    {"file-exec-and-symbols", "file %s", 0},
    {"file-exec-file", "exec-file %s", 0},
    {"file-list-exec-sections", 0, 0},
+   {"file-list-exec-source-file", 0, 0, mi_cmd_file_list_exec_source_file},
    {"file-list-exec-source-files", 0, 0},
    {"file-list-shared-libraries", 0, 0},
    {"file-list-symbol-files", 0, 0},
Index: gdb/mi/mi-cmds.h
===================================================================
RCS file: /cvs/src/src/gdb/mi/mi-cmds.h,v
retrieving revision 1.7
diff -c -r1.7 mi-cmds.h
*** gdb/mi/mi-cmds.h	6 Feb 2003 01:19:12 -0000	1.7
--- gdb/mi/mi-cmds.h	10 Feb 2003 20:51:55 -0000
***************
*** 80,85 ****
--- 80,86 ----
  extern mi_cmd_args_ftype mi_cmd_exec_step_instruction;
  extern mi_cmd_args_ftype mi_cmd_exec_until;
  extern mi_cmd_args_ftype mi_cmd_exec_interrupt;
+ extern mi_cmd_argv_ftype mi_cmd_file_list_exec_source_file;
  extern mi_cmd_argv_ftype mi_cmd_gdb_exit;
  extern mi_cmd_argv_ftype mi_cmd_interpreter_exec;
  extern mi_cmd_argv_ftype mi_cmd_stack_info_depth;