Change pid_t base type

diff --git a/newlib/libc/include/reent.h b/newlib/libc/include/reent.h
index 2b01fbe..b71a901 100644
--- a/newlib/libc/include/reent.h
+++ b/newlib/libc/include/reent.h
@@ -33,13 +33,13 @@
       and do not supply functional interfaces for any of the reentrant
       calls. With this method, the reentrant syscalls are redefined to
       directly call the regular system call without the reentrancy argument.
-      When you do this, specify both -DREENTRANT_SYSCALLS_PROVIDED and 
+      When you do this, specify both -DREENTRANT_SYSCALLS_PROVIDED and
       -DMISSING_SYSCALL_NAMES via newlib_cflags in configure.host and do
       not specify "syscall_dir".
 
    Stubs of the reentrant versions of the syscalls exist in the libc/reent
-   source directory and are provided if REENTRANT_SYSCALLS_PROVIDED isn't 
-   defined.  These stubs call the native system calls: _open, _close, etc. 
+   source directory and are provided if REENTRANT_SYSCALLS_PROVIDED isn't
+   defined.  These stubs call the native system calls: _open, _close, etc.
    if MISSING_SYSCALL_NAMES is *not* defined, otherwise they call the
    non-underscored versions: open, close, etc. when MISSING_SYSCALL_NAMES
    *is* defined.
@@ -51,17 +51,17 @@
    keep a separate errno value which is intuitive since the application flow
    cannot check for failure reliably otherwise.
 
-   The reentrant syscalls are either provided by the platform, by the 
-   libc/reent stubs, or in the case of both MISSING_SYSCALL_NAMES and 
+   The reentrant syscalls are either provided by the platform, by the
+   libc/reent stubs, or in the case of both MISSING_SYSCALL_NAMES and
    REENTRANT_SYSCALLS_PROVIDED being defined, the calls are redefined to
    simply call the regular syscalls with no reentrancy struct argument.
 
    A single-threaded application does not need to worry about the reentrancy
-   structure.  It is used internally.  
+   structure.  It is used internally.
 
-   A multi-threaded application needs either to manually manage reentrancy 
+   A multi-threaded application needs either to manually manage reentrancy
    structures or use dynamic reentrancy.
-   
+
    Manually managing reentrancy structures entails calling special reentrant
    versions of newlib functions that have an additional reentrancy argument.
    For example, _printf_r.  By convention, the first argument is the
@@ -76,7 +76,7 @@
    to __getreent().  This function needs to be implemented by the platform
    and it is meant to return the reentrancy structure for the current
    thread.  When the regular C functions (e.g. printf) go to call internal
-   routines with the default _REENT structure, they end up calling with 
+   routines with the default _REENT structure, they end up calling with
    the reentrancy structure for the thread.  Thus, application code does not
    need to call the _r routines nor worry about reentrancy structures.  */
 
@@ -139,11 +139,11 @@ struct timezone;
 extern int _close_r (struct _reent *, int);
 extern int _execve_r (struct _reent *, const char *, char *const *, char *const *);
 extern int _fcntl_r (struct _reent *, int, int, int);
-extern int _fork_r (struct _reent *);
+extern __pid_t _fork_r (struct _reent *);
 extern int _fstat_r (struct _reent *, int, struct stat *);
-extern int _getpid_r (struct _reent *);
+extern __pid_t _getpid_r (struct _reent *);
 extern int _isatty_r (struct _reent *, int);
-extern int _kill_r (struct _reent *, int, int);
+extern int _kill_r (struct _reent *, __pid_t, int);
 extern int _link_r (struct _reent *, const char *, const char *);
 extern _off_t _lseek_r (struct _reent *, int, _off_t, int);
 extern int _mkdir_r (struct _reent *, const char *, int);
diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index 65ff520..5a05af0 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -1,4 +1,4 @@
-/* unified sys/types.h: 
+/* unified sys/types.h:
    start with sef's sysvi386 version.
    merge go32 version -- a few ifdefs.
    h8300hms, h8300xray, and sysvnecv70 disagree on the following types:
@@ -10,8 +10,8 @@
    typedef int mode_t;
    typedef int caddr_t;
 
-   however, these aren't "reasonable" values, the sysvi386 ones make far 
-   more sense, and should work sufficiently well (in particular, h8300 
+   however, these aren't "reasonable" values, the sysvi386 ones make far
+   more sense, and should work sufficiently well (in particular, h8300
    doesn't have a stat, and the necv70 doesn't matter.) -- eichin
  */
 
@@ -29,7 +29,7 @@ typedef __uint8_t	u_int8_t;
 #endif
 #if ___int16_t_defined
 typedef __uint16_t	u_int16_t;
-#endif 
+#endif
 #if ___int32_t_defined
 typedef __uint32_t	u_int32_t;
 #endif
diff --git a/newlib/libc/reent/execr.c b/newlib/libc/reent/execr.c
index 59b6122..54b68d2 100644
--- a/newlib/libc/reent/execr.c
+++ b/newlib/libc/reent/execr.c
@@ -29,7 +29,7 @@ extern int errno;
 
 /*
 FUNCTION
-	<<_execve_r>>---Reentrant version of execve	
+	<<_execve_r>>---Reentrant version of execve
 INDEX
 	_execve_r
 
@@ -63,7 +63,7 @@ _execve_r (struct _reent *ptr,
 NEWPAGE
 FUNCTION
 	<<_fork_r>>---Reentrant version of fork
-	
+
 INDEX
 	_fork_r
 
@@ -79,10 +79,10 @@ DESCRIPTION
 
 #ifndef NO_FORK
 
-int
+pid_t
 _fork_r (struct _reent *ptr)
 {
-  int ret;
+  pid_t ret;
 
   errno = 0;
   if ((ret = _fork ()) == -1 && errno != 0)
@@ -96,7 +96,7 @@ _fork_r (struct _reent *ptr)
 NEWPAGE
 FUNCTION
 	<<_wait_r>>---Reentrant version of wait
-	
+
 INDEX
 	_wait_r
 
diff --git a/newlib/libc/reent/signalr.c b/newlib/libc/reent/signalr.c
index 345910e..cb41510 100644
--- a/newlib/libc/reent/signalr.c
+++ b/newlib/libc/reent/signalr.c
@@ -28,7 +28,7 @@ extern int errno;
 /*
 FUNCTION
 	<<_kill_r>>---Reentrant version of kill
-	
+
 INDEX
 	_kill_r
 
@@ -44,7 +44,7 @@ DESCRIPTION
 
 int
 _kill_r (struct _reent *ptr,
-     int pid,
+     pid_t pid,
      int sig)
 {
   int ret;
@@ -59,7 +59,7 @@ _kill_r (struct _reent *ptr,
 NEWPAGE
 FUNCTION
 	<<_getpid_r>>---Reentrant version of getpid
-	
+
 INDEX
 	_getpid_r
 
@@ -76,10 +76,10 @@ DESCRIPTION
 	still must have the reentrant pointer argument.
 */
 
-int
+pid_t
 _getpid_r (struct _reent *ptr)
 {
-  int ret;
+  pid_t ret;
   ret = _getpid ();
   return ret;
 }
diff --git a/newlib/libc/syscalls/sysfork.c b/newlib/libc/syscalls/sysfork.c
index 282f73f..d819c28 100644
--- a/newlib/libc/syscalls/sysfork.c
+++ b/newlib/libc/syscalls/sysfork.c
@@ -7,7 +7,7 @@
 #include <reent.h>
 #include <unistd.h>
 
-int
+pid_t
 fork (void)
 {
   return _fork_r (_REENT);
diff --git a/newlib/libc/syscalls/sysgetpid.c b/newlib/libc/syscalls/sysgetpid.c
index 22c7605..fae7a15 100644
--- a/newlib/libc/syscalls/sysgetpid.c
+++ b/newlib/libc/syscalls/sysgetpid.c
@@ -3,7 +3,7 @@
 #include <reent.h>
 #include <unistd.h>
 
-int
+pid_t
 getpid (void)
 {
   return _getpid_r (_REENT);
diff --git a/newlib/libc/syscalls/syskill.c b/newlib/libc/syscalls/syskill.c
index 34b9f17..7687604 100644
--- a/newlib/libc/syscalls/syskill.c
+++ b/newlib/libc/syscalls/syskill.c
@@ -4,7 +4,7 @@
 #include <signal.h>
 
 int
-kill (int pid,
+kill (pid_t pid,
      int sig)
 {
   return _kill_r (_REENT, pid, sig);