Index: Python/sysmodule.c
===================================================================
--- Python/sysmodule.c	(revision 67215)
+++ Python/sysmodule.c	(working copy)
@@ -47,7 +47,7 @@
 #endif
 
 PyObject *
-PySys_GetObject(char *name)
+PySys_GetObject(const char *name)
 {
 	PyThreadState *tstate = PyThreadState_GET();
 	PyObject *sd = tstate->interp->sysdict;
@@ -57,7 +57,7 @@
 }
 
 FILE *
-PySys_GetFile(char *name, FILE *def)
+PySys_GetFile(const char *name, FILE *def)
 {
 	FILE *fp = NULL;
 	PyObject *v = PySys_GetObject(name);
@@ -69,7 +69,7 @@
 }
 
 int
-PySys_SetObject(char *name, PyObject *v)
+PySys_SetObject(const char *name, PyObject *v)
 {
 	PyThreadState *tstate = PyThreadState_GET();
 	PyObject *sd = tstate->interp->sysdict;
@@ -973,7 +973,7 @@
 }
 
 void
-PySys_AddWarnOption(char *s)
+PySys_AddWarnOption(const char *s)
 {
 	PyObject *str;
 
@@ -1437,10 +1437,10 @@
 }
 
 static PyObject *
-makepathobject(char *path, int delim)
+makepathobject(const char *path, int delim)
 {
 	int i, n;
-	char *p;
+	const char *p;
 	PyObject *v, *w;
 
 	n = 1;
@@ -1470,7 +1470,7 @@
 }
 
 void
-PySys_SetPath(char *path)
+PySys_SetPath(const char *path)
 {
 	PyObject *v;
 	if ((v = makepathobject(path, DELIM)) == NULL)
@@ -1648,7 +1648,7 @@
  */
 
 static void
-mywrite(char *name, FILE *fp, const char *format, va_list va)
+mywrite(const char *name, FILE *fp, const char *format, va_list va)
 {
 	PyObject *file;
 	PyObject *error_type, *error_value, *error_traceback;
Index: Include/sysmodule.h
===================================================================
--- Include/sysmodule.h	(revision 67215)
+++ Include/sysmodule.h	(working copy)
@@ -7,11 +7,11 @@
 extern "C" {
 #endif
 
-PyAPI_FUNC(PyObject *) PySys_GetObject(char *);
-PyAPI_FUNC(int) PySys_SetObject(char *, PyObject *);
-PyAPI_FUNC(FILE *) PySys_GetFile(char *, FILE *);
+PyAPI_FUNC(PyObject *) PySys_GetObject(const char *);
+PyAPI_FUNC(int) PySys_SetObject(const char *, PyObject *);
+PyAPI_FUNC(FILE *) PySys_GetFile(const char *, FILE *);
 PyAPI_FUNC(void) PySys_SetArgv(int, char **);
-PyAPI_FUNC(void) PySys_SetPath(char *);
+PyAPI_FUNC(void) PySys_SetPath(const char *);
 
 PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)
 			Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
@@ -22,7 +22,7 @@
 PyAPI_DATA(int) _PySys_CheckInterval;
 
 PyAPI_FUNC(void) PySys_ResetWarnOptions(void);
-PyAPI_FUNC(void) PySys_AddWarnOption(char *);
+PyAPI_FUNC(void) PySys_AddWarnOption(const char *);
 PyAPI_FUNC(int) PySys_HasWarnOptions(void);
 
 #ifdef __cplusplus
Index: Doc/c-api/sys.rst
===================================================================
--- Doc/c-api/sys.rst	(revision 67215)
+++ Doc/c-api/sys.rst	(working copy)
@@ -63,18 +63,18 @@
 accessible to C code.  They all work with the current interpreter thread's
 :mod:`sys` module's dict, which is contained in the internal thread state structure.
 
-.. cfunction:: PyObject *PySys_GetObject(char *name)
+.. cfunction:: PyObject *PySys_GetObject(const char *name)
 
    Return the object *name* from the :mod:`sys` module or *NULL* if it does
    not exist, without setting an exception.
 
-.. cfunction:: FILE *PySys_GetFile(char *name, FILE *def)
+.. cfunction:: FILE *PySys_GetFile(const char *name, FILE *def)
 
    Return the :ctype:`FILE*` associated with the object *name* in the
    :mod:`sys` module, or *def* if *name* is not in the module or is not associated
    with a :ctype:`FILE*`.
 
-.. cfunction:: int PySys_SetObject(char *name, PyObject *v)
+.. cfunction:: int PySys_SetObject(const char *name, PyObject *v)
 
    Set *name* in the :mod:`sys` module to *v* unless *v* is *NULL*, in which
    case *name* is deleted from the sys module. Returns ``0`` on success, ``-1``
@@ -84,11 +84,11 @@
 
    Reset :data:`sys.warnoptions` to an empty list.
 
-.. cfunction:: void PySys_AddWarnOption(char *s)
+.. cfunction:: void PySys_AddWarnOption(const char *s)
 
    Append *s* to :data:`sys.warnoptions`.
 
-.. cfunction:: void PySys_SetPath(char *path)
+.. cfunction:: void PySys_SetPath(const char *path)
 
    Set :data:`sys.path` to a list object of paths found in *path* which should
    be a list of paths separated with the platform's search path delimiter