* configure.in: Check for working mmap, ansi headers, string.h,

strings.h, and memory.h.
* configure: Regenerated.

* gdb_stat.h: New file, "portable" <sys/stat.h>.
* gdb_string.h: New file, "portable" <string.h>.

* altos-xdep.c, arm-tdep.c, arm-xdep.c, convex-tdep.c,
convex-xdep.c, coredep.c, cxux-nat.c, dbxread.c, exec.c,
gould-xdep.c, hppa-tdep.c, i386aix-nat.c, i386b-nat.c,
i386mach-nat.c, i386v-nat.c, infptrace.c, m88k-nat.c, main.c,
mdebugread.c, objfiles.c, os9kread.c, procfs.c, pyr-xdep.c,
rs6000-nat.c, source.c, standalone.c, stuff.c, sun386-nat.c,
symfile.c, symm-nat.c, symm-tdep.c, symtab.c, top.c, ultra3-nat.c,
ultra3-xdep.c, umax-xdep.c, xcoffread.c: Include "gdb_stat.h"
instead of <sys/stat.h>.

* alpha-tdep.c, breakpoint.c, buildsym.c, c-typeprint.c,
ch-typeprint.c, coffread.c, command.c, core-sol2.c, core-svr4.c,
core.c, corelow.c, cp-valprint.c, dbxread.c, dcache.c, demangle.c,
dpx2-nat.c, dstread.c, dwarfread.c, elfread.c, environ.c, eval.c,
exec.c, f-lang.c, f-typeprint.c, f-valprint.c, findvar.c,
fork-child.c, gdbtypes.c, hpread.c, i386-tdep.c, infcmd.c,
inflow.c, infptrace.c, infrun.c, irix5-nat.c, language.c,
m2-typeprint.c, main.c, mdebugread.c, minsyms.c, mipsread.c,
monitor.c, nlmread.c, objfiles.c, os9kread.c, osfsolib.c, parse.c,
printcmd.c, procfs.c, regex.c, remote-adapt.c, remote-arc.c,
remote-array.c, remote-bug.c, remote-e7000.c, remote-eb.c,
remote-es.c, remote-hms.c, remote-mm.c, remote-os9k.c,
remote-pa.c, remote-sim.c, remote-st.c, remote-udi.c,
remote-utils.c, remote-vx.c, remote-vx29k.c, remote-vx68.c,
remote-vx960.c, remote-vxmips.c, remote-vxsparc.c, remote.c,
solib.c, somread.c, source.c, stabsread.c, stack.c, symfile.c,
symmisc.c, symtab.c, target.c, top.c, typeprint.c, utils.c,
valarith.c, valops.c, valprint.c, values.c, xcoffread.c: Include
"gdb_string.h" instead of <string.h>.
* gdbtk.c: Likewise.

* config/xm-sysv4.h, i386/xm-ptx.h, m68k/xm-sun3os4.h,
sparc/xm-sun4os4.h (HAVE_MMAP): Removed.

* config/xm-lynx.h, config/i386/xm-ptx.h,
config/m68k/nm-apollo68b.h, config/m68k/xm-hp300hpux.h,
config/mips/xm-irix3.h, config/mips/xm-mips.h,
config/mips/xm-news-mips.h, config/mips/xm-riscos.h,
config/pa/hppah.h, config/rs6000/xm-rs6000.h,
config/sparc/xm-sun4os4.h, config/sparc/xm-sun4sol2.h,
config/vax/xm-vaxbsd.h, config/vax/xm-vaxult.h,
config/vax/xm-vaxult2.h (MEM_FNS_DECLARED): Removed.
* config/mips/xm-irix3.h, config/mips/xm-mips.h,
config/pa/xm-hppah.h (memcpy, memset): Removed declarations.

gdb/infrun.c

@@ -19,7 +19,7 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include "defs.h"
-#include <string.h>
+#include "gdb_string.h"
 #include <ctype.h>
 #include "symtab.h"
 #include "frame.h"
@@ -479,7 +479,9 @@ wait_for_inferior ()
       else
 	pid = target_wait (-1, &w);
 
+#ifdef HAVE_NONSTEPPABLE_WATCHPOINT
     have_waited:
+#endif
 
       flush_cached_frames ();
 
@@ -527,6 +529,12 @@ wait_for_inferior ()
 			     (unsigned int)w.value.integer);
 	  else
 	    printf_filtered ("\nProgram exited normally.\n");
+
+	  /* Record the exit code in the convenience variable $_exitcode, so
+	     that the user can inspect this again later.  */
+	  set_internalvar (lookup_internalvar ("_exitcode"),
+			   value_from_longest (builtin_type_int, 
+					       (LONGEST) w.value.integer));
 	  gdb_flush (gdb_stdout);
 	  target_mourn_inferior ();
 #ifdef NO_SINGLE_STEP
@@ -650,32 +658,28 @@ wait_for_inferior ()
 	  /* It's a SIGTRAP or a signal we're interested in.  Switch threads,
 	     and fall into the rest of wait_for_inferior().  */
 
+	  /* Save infrun state for the old thread.  */
+	  save_infrun_state (inferior_pid, prev_pc,
+			     prev_func_start, prev_func_name,
+			     trap_expected, step_resume_breakpoint,
+			     through_sigtramp_breakpoint,
+			     step_range_start, step_range_end,
+			     step_frame_address, handling_longjmp,
+			     another_trap);
+
 	  inferior_pid = pid;
+
+	  /* Load infrun state for the new thread.  */
+	  load_infrun_state (inferior_pid, &prev_pc,
+			     &prev_func_start, &prev_func_name,
+			     &trap_expected, &step_resume_breakpoint,
+			     &through_sigtramp_breakpoint,
+			     &step_range_start, &step_range_end,
+			     &step_frame_address, &handling_longjmp,
+			     &another_trap);
 	  printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid));
 
 	  flush_cached_frames ();
-	  trap_expected = 0;
-	  if (step_resume_breakpoint)
-	    {
-	      delete_breakpoint (step_resume_breakpoint);
-	      step_resume_breakpoint = NULL;
-	    }
-
-	  /* Not sure whether we need to blow this away too,
-	     but probably it is like the step-resume
-	     breakpoint.  */
-	  if (through_sigtramp_breakpoint)
-	    {
-	      delete_breakpoint (through_sigtramp_breakpoint);
-	      through_sigtramp_breakpoint = NULL;
-	    }
-	  prev_pc = 0;
-	  prev_func_name = NULL;
-	  step_range_start = 0;
-	  step_range_end = 0;
-	  step_frame_address = 0;
-	  handling_longjmp = 0;
-	  another_trap = 0;
 	}
 
 #ifdef NO_SINGLE_STEP