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[Xen-changelog] Remove all unnecessary uses of keyword arguments, to reduce complexity. In



# HG changeset patch
# User emellor@xxxxxxxxxxxxxxxxxxxxxx
# Node ID e60115657823355aca523eaae72b9b7158c52b1c
# Parent  aad88a902892b061ea70a71d9d0881ef484bff5a
Remove all unnecessary uses of keyword arguments, to reduce complexity.  In
many places we were supporting keywords for calling the methods here, and never
using that feature (especially where all the arguments were compulsory anyway)
and in some places we were even accepting positional and keyword arguments, and
not actually taking any arguments to the method at all!

Fix the permission parsing string in xspy_set_permissions -- this would have
blown up horribly if anyone were actually calling this code.

Fix the documentation comments to include the transaction handle throughout.

Have the self parameter to all the methods be an XsHandle, not a PyObject, to
avoid casting.

Remove unused pyvalue_int and pyvalue_str.

Signed-off-by: Ewan Mellor <ewan@xxxxxxxxxxxxx>

diff -r aad88a902892 -r e60115657823 tools/python/xen/lowlevel/xs/xs.c
--- a/tools/python/xen/lowlevel/xs/xs.c Sat Nov 19 09:37:14 2005
+++ b/tools/python/xen/lowlevel/xs/xs.c Mon Nov 21 11:34:37 2005
@@ -51,47 +51,35 @@
     PyObject *watches;
 } XsHandle;
 
-static inline struct xs_handle *xshandle(PyObject *self)
-{
-    struct xs_handle *xh = ((XsHandle*)self)->xh;
+static inline struct xs_handle *xshandle(XsHandle *self)
+{
+    struct xs_handle *xh = self->xh;
     if (!xh)
         PyErr_SetString(PyExc_RuntimeError, "invalid xenstore daemon handle");
     return xh;
 }
 
-static inline PyObject *pyvalue_int(int val) {
-    return (val
-            ? PyInt_FromLong(val)
-            : PyErr_SetFromErrno(PyExc_RuntimeError));
-}
-
-static inline PyObject *pyvalue_str(char *val) {
-    return (val
-            ? PyString_FromString(val)
-            : PyErr_SetFromErrno(PyExc_RuntimeError));
-}
-
 static void remove_watch(XsHandle *xsh, PyObject *token);
 
 static PyObject *none(bool result);
 
-static int parse_transaction_path(PyObject *self, PyObject *args,
-                                  PyObject *kwds,
+static int parse_transaction_path(XsHandle *self, PyObject *args,
                                   struct xs_handle **xh,
                                   struct xs_transaction_handle **th,
                                   char **path);
 
 
-#define xspy_read_doc "\n"                     \
-       "Read data from a path.\n"              \
-       " path [string]: xenstore path\n"       \
-       "\n"                                    \
-       "Returns: [string] data read.\n"        \
-       "         None if key doesn't exist.\n" \
-       "Raises RuntimeError on error.\n"       \
-       "\n"
-
-static PyObject *xspy_read(PyObject *self, PyObject *args, PyObject *kwds)
+#define xspy_read_doc "\n"                              \
+       "Read data from a path.\n"                      \
+       " transaction [string]: transaction handle\n"   \
+       " path [string]:        xenstore path\n"        \
+       "\n"                                            \
+       "Returns: [string] data read.\n"                \
+       "         None if key doesn't exist.\n"         \
+       "Raises RuntimeError on error.\n"               \
+       "\n"
+
+static PyObject *xspy_read(XsHandle *self, PyObject *args)
 {
     struct xs_handle *xh;
     struct xs_transaction_handle *th;
@@ -100,7 +88,7 @@
     char *xsval;
     unsigned int xsval_n;
 
-    if (!parse_transaction_path(self, args, kwds, &xh, &th, &path))
+    if (!parse_transaction_path(self, args, &xh, &th, &path))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -119,6 +107,7 @@
 
 #define xspy_write_doc "\n"                                    \
        "Write data to a path.\n"                               \
+       " transaction [string]: transaction handle\n"           \
        " path   [string] : xenstore path to write to\n."       \
        " data   [string] : data to write.\n"                   \
        "\n"                                                    \
@@ -126,24 +115,20 @@
        "Raises RuntimeError on error.\n"                       \
        "\n"
 
-static PyObject *xspy_write(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    static char *kwd_spec[] = { "transaction", "path", "data", NULL };
+static PyObject *xspy_write(XsHandle *self, PyObject *args)
+{
     static char *arg_spec = "sss#";
-    char *path = NULL;
-    char *data = NULL;
-    int data_n = 0;
-
-    struct xs_handle *xh = xshandle(self);
-    bool result;
-
+    struct xs_handle *xh = xshandle(self);
     struct xs_transaction_handle *th;
     char *thstr;
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &thstr, &path, &data, &data_n))
+    char *path;
+    char *data;
+    int data_n;
+    bool result;
+
+    if (!xh)
+        return NULL;
+    if (!PyArg_ParseTuple(args, arg_spec, &thstr, &path, &data, &data_n))
         return NULL;
 
     th = (struct xs_transaction_handle *)strtoul(thstr, NULL, 16);
@@ -158,14 +143,15 @@
 
 #define xspy_ls_doc "\n"                                       \
        "List a directory.\n"                                   \
-       " path [string]: path to list.\n"                       \
+       " transaction [string]: transaction handle\n"           \
+       " path [string]:        path to list.\n"                \
        "\n"                                                    \
        "Returns: [string array] list of subdirectory names.\n" \
        "         None if key doesn't exist.\n"                 \
        "Raises RuntimeError on error.\n"                       \
        "\n"
 
-static PyObject *xspy_ls(PyObject *self, PyObject *args, PyObject *kwds)
+static PyObject *xspy_ls(XsHandle *self, PyObject *args)
 {
     struct xs_handle *xh;
     struct xs_transaction_handle *th;
@@ -174,7 +160,7 @@
     char **xsval;
     int xsval_n;
 
-    if (!parse_transaction_path(self, args, kwds, &xh, &th, &path))
+    if (!parse_transaction_path(self, args, &xh, &th, &path))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -203,7 +189,7 @@
        "Raises RuntimeError on error.\n"                       \
        "\n"
 
-static PyObject *xspy_mkdir(PyObject *self, PyObject *args, PyObject *kwds)
+static PyObject *xspy_mkdir(XsHandle *self, PyObject *args)
 {
     struct xs_handle *xh;
     struct xs_transaction_handle *th;
@@ -211,7 +197,7 @@
 
     bool result;
 
-    if (!parse_transaction_path(self, args, kwds, &xh, &th, &path))
+    if (!parse_transaction_path(self, args, &xh, &th, &path))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -222,15 +208,16 @@
 }
 
 
-#define xspy_rm_doc "\n"                       \
-       "Remove a path.\n"                      \
-       " path [string] : path to remove\n"     \
-       "\n"                                    \
-       "Returns None on success.\n"            \
-       "Raises RuntimeError on error.\n"       \
-       "\n"
-
-static PyObject *xspy_rm(PyObject *self, PyObject *args, PyObject *kwds)
+#define xspy_rm_doc "\n"                                \
+       "Remove a path.\n"                              \
+       " transaction [string]: transaction handle\n"   \
+       " path [string] : path to remove\n"             \
+       "\n"                                            \
+       "Returns None on success.\n"                    \
+       "Raises RuntimeError on error.\n"               \
+       "\n"
+
+static PyObject *xspy_rm(XsHandle *self, PyObject *args)
 {
     struct xs_handle *xh;
     struct xs_transaction_handle *th;
@@ -238,7 +225,7 @@
 
     bool result;
 
-    if (!parse_transaction_path(self, args, kwds, &xh, &th, &path))
+    if (!parse_transaction_path(self, args, &xh, &th, &path))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -249,18 +236,17 @@
 }
 
 
-#define xspy_get_permissions_doc "\n"          \
-       "Get the permissions for a path\n"      \
-       " path [string]: xenstore path.\n"      \
-       "\n"                                    \
-       "Returns: permissions array.\n"         \
-       "Raises RuntimeError on error.\n"       \
-       "\n"
-
-static PyObject *xspy_get_permissions(PyObject *self, PyObject *args,
-                                      PyObject *kwds)
-{
-    static char *kwd_spec[] = { "transaction", "path", NULL };
+#define xspy_get_permissions_doc "\n"                   \
+       "Get the permissions for a path\n"              \
+       " transaction [string]: transaction handle\n"   \
+       " path [string]:        xenstore path.\n"       \
+       "\n"                                            \
+       "Returns: permissions array.\n"                 \
+       "Raises RuntimeError on error.\n"               \
+       "\n"
+
+static PyObject *xspy_get_permissions(XsHandle *self, PyObject *args)
+{
     static char *arg_spec = "ss";
     char *path = NULL;
 
@@ -274,8 +260,7 @@
 
     if (!xh)
         return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &thstr, &path))
+    if (!PyArg_ParseTuple(args, arg_spec, &thstr, &path))
         return NULL;
 
     th = (struct xs_transaction_handle *)strtoul(thstr, NULL, 16);
@@ -303,39 +288,35 @@
     }
 }
 
-#define xspy_set_permissions_doc "\n"          \
-       "Set the permissions for a path\n"      \
-       " path  [string] : xenstore path.\n"    \
-       " perms          : permissions.\n"      \
-       "\n"                                    \
-       "Returns None on success.\n"            \
-       "Raises RuntimeError on error.\n"       \
-       "\n"
-
-static PyObject *xspy_set_permissions(PyObject *self, PyObject *args,
-                                      PyObject *kwds)
-{
-    static char *kwd_spec[] = { "transaction", "path", "perms", NULL };
-    static char *arg_spec = "ssO";
-    char *path = NULL;
-    PyObject *perms = NULL;
+#define xspy_set_permissions_doc "\n"                   \
+       "Set the permissions for a path\n"              \
+       " transaction [string]: transaction handle\n"   \
+       " path  [string]      : xenstore path.\n"       \
+       " perms               : permissions.\n"         \
+       "\n"                                            \
+       "Returns None on success.\n"                    \
+       "Raises RuntimeError on error.\n"               \
+       "\n"
+
+static PyObject *xspy_set_permissions(XsHandle *self, PyObject *args)
+{
+    char *path;
+    PyObject *perms;
     static char *perm_names[] = { "dom", "read", "write", NULL };
-    static char *perm_spec = "i|iiii";
+    static char *perm_spec = "i|ii";
 
     struct xs_handle *xh = xshandle(self);
     int i, result;
     struct xs_permissions *xsperms = NULL;
-    int xsperms_n = 0;
+    int xsperms_n;
     PyObject *tuple0 = NULL;
-    PyObject *val = NULL;
 
     struct xs_transaction_handle *th;
     char *thstr;
 
     if (!xh)
         goto exit;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &thstr, &path, &perms))
+    if (!PyArg_ParseTuple(args, "ssO", &thstr, &path, &perms))
         goto exit;
 
     th = (struct xs_transaction_handle *)strtoul(thstr, NULL, 16);
@@ -354,15 +335,12 @@
     if (!tuple0)
         goto exit;
     for (i = 0; i < xsperms_n; i++) {
-        /* Domain the permissions apply to. */
-        int dom = 0;
         /* Read/write perms. Set these. */
         int p_read = 0, p_write = 0;
         PyObject *p = PyList_GetItem(perms, i);
         if (!PyArg_ParseTupleAndKeywords(tuple0, p, perm_spec, perm_names,
-                                         &dom, &p_read, &p_write))
+                                         &xsperms[i].id, &p_read, &p_write))
             goto exit;
-        xsperms[i].id = dom;
         if (p_read)
             xsperms[i].perms |= XS_PERM_READ;
         if (p_write)
@@ -375,12 +353,14 @@
         PyErr_SetFromErrno(PyExc_RuntimeError);
         goto exit;
     }
+
     Py_INCREF(Py_None);
-    val = Py_None;
+    return Py_None;
+
  exit:
     Py_XDECREF(tuple0);
     free(xsperms);
-    return val;
+    return NULL;
 }
 
 #define xspy_watch_doc "\n"                                            \
@@ -395,23 +375,18 @@
 /* Each 10 bits takes ~ 3 digits, plus one, plus one for nul terminator. */
 #define MAX_STRLEN(x) ((sizeof(x) * CHAR_BIT + CHAR_BIT-1) / 10 * 3 + 2)
 
-static PyObject *xspy_watch(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    static char *kwd_spec[] = { "path", "token", NULL };
-    static char *arg_spec = "sO";
-    char *path = NULL;
+static PyObject *xspy_watch(XsHandle *self, PyObject *args)
+{
+    struct xs_handle *xh = xshandle(self);
+    char *path;
     PyObject *token;
     char token_str[MAX_STRLEN(unsigned long) + 1];
+    int result;
     int i;
 
-    XsHandle *xsh = (XsHandle *)self;
-    struct xs_handle *xh = xshandle(self);
-    int result = 0;
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec, 
-                                     &path, &token))
+    if (!xh)
+        return NULL;
+    if (!PyArg_ParseTuple(args, "sO", &path, &token))
         return NULL;
 
     /* Note that we have to store the watch token in the xs->watches list
@@ -419,14 +394,14 @@
        races with xs_read_watch.
     */
 
-    for (i = 0; i < PyList_Size(xsh->watches); i++) {
-        if (PyList_GetItem(xsh->watches, i) == Py_None) {
-            PySequence_SetItem(xsh->watches, i, token);
+    for (i = 0; i < PyList_Size(self->watches); i++) {
+        if (PyList_GetItem(self->watches, i) == Py_None) {
+            PySequence_SetItem(self->watches, i, token);
             break;
         }
     }
-    if (i == PyList_Size(xsh->watches))
-        PyList_Append(xsh->watches, token);
+    if (i == PyList_Size(self->watches))
+        PyList_Append(self->watches, token);
 
     sprintf(token_str, "%li", (unsigned long)token);
     Py_BEGIN_ALLOW_THREADS
@@ -434,7 +409,7 @@
     Py_END_ALLOW_THREADS
 
     if (!result)
-        remove_watch(xsh, token);
+        remove_watch(self, token);
 
     return none(result);
 }
@@ -447,24 +422,17 @@
        "Raises RuntimeError on error.\n"                       \
        "\n"
 
-static PyObject *xspy_read_watch(PyObject *self, PyObject *args,
-                                 PyObject *kwds)
-{
-    static char *kwd_spec[] = { NULL };
-    static char *arg_spec = "";
-
-    XsHandle *xsh = (XsHandle *)self;
+static PyObject *xspy_read_watch(XsHandle *self, PyObject *args)
+{
     struct xs_handle *xh = xshandle(self);
     PyObject *val = NULL;
-    char **xsval = NULL;
+    char **xsval;
     PyObject *token;
     int i;
     unsigned int num;
 
     if (!xh)
         return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec))
-        return NULL;
 
 again:
     Py_BEGIN_ALLOW_THREADS
@@ -478,11 +446,11 @@
         PyErr_SetString(PyExc_RuntimeError, "invalid token");
         goto exit;
     }
-    for (i = 0; i < PyList_Size(xsh->watches); i++) {
-        if (token == PyList_GetItem(xsh->watches, i))
+    for (i = 0; i < PyList_Size(self->watches); i++) {
+        if (token == PyList_GetItem(self->watches, i))
             break;
     }
-    if (i == PyList_Size(xsh->watches)) {
+    if (i == PyList_Size(self->watches)) {
       /* We do not have a registered watch for the one that has just fired.
          Ignore this -- a watch that has been recently deregistered can still
          have watches in transit.  This is a blocking method, so go back to
@@ -507,22 +475,17 @@
        "Raises RuntimeError on error.\n"               \
        "\n"
 
-static PyObject *xspy_unwatch(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    static char *kwd_spec[] = { "path", "token", NULL };
-    static char *arg_spec = "sO";
-    char *path = NULL;
+static PyObject *xspy_unwatch(XsHandle *self, PyObject *args)
+{
+    struct xs_handle *xh = xshandle(self);
+    char *path;
     PyObject *token;
     char token_str[MAX_STRLEN(unsigned long) + 1];
-
-    XsHandle *xsh = (XsHandle *)self;
-    struct xs_handle *xh = xshandle(self);
-    int result = 0;
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec, &path,
-                                     &token))
+    int result;
+
+    if (!xh)
+        return NULL;
+    if (!PyArg_ParseTuple(args, "sO", &path, &token))
         return NULL;
 
     sprintf(token_str, "%li", (unsigned long)token);
@@ -530,7 +493,7 @@
     result = xs_unwatch(xh, path, token_str);
     Py_END_ALLOW_THREADS
 
-    remove_watch(xsh, token);
+    remove_watch(self, token);
 
     return none(result);
 }
@@ -542,20 +505,13 @@
        "Raises RuntimeError on error.\n"                       \
        "\n"
 
-static PyObject *xspy_transaction_start(PyObject *self, PyObject *args,
-                                        PyObject *kwds)
-{
-    static char *kwd_spec[] = { NULL };
-    static char *arg_spec = "";
-    char *path = NULL;
-
+static PyObject *xspy_transaction_start(XsHandle *self)
+{
     struct xs_handle *xh = xshandle(self);
     struct xs_transaction_handle *th;
-    char thstr[20];
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec, &path))
+    char thstr[MAX_STRLEN(unsigned long) + 1];
+
+    if (!xh)
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -580,7 +536,7 @@
        "Raises RuntimeError on error.\n"                               \
        "\n"
 
-static PyObject *xspy_transaction_end(PyObject *self, PyObject *args,
+static PyObject *xspy_transaction_end(XsHandle *self, PyObject *args,
                                       PyObject *kwds)
 {
     static char *kwd_spec[] = { "transaction", "abort", NULL };
@@ -630,22 +586,18 @@
        "Raises RuntimeError on error.\n"                               \
        "\n"
 
-static PyObject *xspy_introduce_domain(PyObject *self, PyObject *args,
-                                       PyObject *kwds)
-{
-    static char *kwd_spec[] = { "dom", "page", "port", NULL };
-    static char *arg_spec = "ili";
-    domid_t dom = 0;
-    unsigned long page = 0;
-    unsigned int port = 0;
+static PyObject *xspy_introduce_domain(XsHandle *self, PyObject *args)
+{
+    domid_t dom;
+    unsigned long page;
+    unsigned int port;
 
     struct xs_handle *xh = xshandle(self);
     bool result = 0;
 
     if (!xh)
         return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &dom, &page, &port))
+    if (!PyArg_ParseTuple(args, "ili", &dom, &page, &port))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -665,11 +617,8 @@
        "Raises RuntimeError on error.\n"                               \
        "\n"
 
-static PyObject *xspy_release_domain(PyObject *self, PyObject *args,
-                                     PyObject *kwds)
-{
-    static char *kwd_spec[] = { "dom", NULL };
-    static char *arg_spec = "i";
+static PyObject *xspy_release_domain(XsHandle *self, PyObject *args)
+{
     domid_t dom;
 
     struct xs_handle *xh = xshandle(self);
@@ -677,8 +626,7 @@
 
     if (!xh)
         return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &dom))
+    if (!PyArg_ParseTuple(args, "i", &dom))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -696,27 +644,21 @@
        "Raises RuntimeError on error.\n"       \
        "\n"
 
-static PyObject *xspy_close(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    static char *kwd_spec[] = { NULL };
-    static char *arg_spec = "";
+static PyObject *xspy_close(XsHandle *self)
+{
+    struct xs_handle *xh = xshandle(self);
     int i;
 
-    XsHandle *xsh = (XsHandle *)self;
-    struct xs_handle *xh = xshandle(self);
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec))
-        return NULL;
-
-    for (i = 0; i < PyList_Size(xsh->watches); i++) {
+    if (!xh)
+        return NULL;
+
+    for (i = 0; i < PyList_Size(self->watches); i++) {
         /* TODO: xs_unwatch watches */
-        PySequence_SetItem(xsh->watches, i, Py_None);
+        PySequence_SetItem(self->watches, i, Py_None);
     }
 
     xs_daemon_close(xh);
-    xsh->xh = NULL;
+    self->xh = NULL;
 
     Py_INCREF(Py_None);
     return Py_None;
@@ -731,20 +673,15 @@
        "Raises RuntimeError on error.\n"               \
        "\n"
 
-static PyObject *xspy_get_domain_path(PyObject *self, PyObject *args,
-                                     PyObject *kwds)
-{
-    static char *kwd_spec[] = { "domid", NULL };
-    static char *arg_spec = "i";
-    int domid = 0;
-
-    struct xs_handle *xh = xshandle(self);
-    char *xsval = NULL;
-
-    if (!xh)
-        return NULL;
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &domid))
+static PyObject *xspy_get_domain_path(XsHandle *self, PyObject *args)
+{
+    struct xs_handle *xh = xshandle(self);
+    int domid;
+    char *xsval;
+
+    if (!xh)
+        return NULL;
+    if (!PyArg_ParseTuple(args, "i", &domid))
         return NULL;
 
     Py_BEGIN_ALLOW_THREADS
@@ -766,13 +703,13 @@
  * Remove the given token from the watches list belonging to the given
  * XsHandle, if present.
  */
-static void remove_watch(XsHandle *xsh, PyObject *token)
+static void remove_watch(XsHandle *self, PyObject *token)
 {
     int i;
 
-    for (i = 0; i < PyList_Size(xsh->watches); i++) {
-        if (PyList_GetItem(xsh->watches, i) == token) {
-            PySequence_SetItem(xsh->watches, i, Py_None);
+    for (i = 0; i < PyList_Size(self->watches); i++) {
+        if (PyList_GetItem(self->watches, i) == token) {
+            PySequence_SetItem(self->watches, i, Py_None);
             return;
         }
     }
@@ -787,14 +724,11 @@
  * @return 1 on success, in which case *xh, *th, and *path are valid, or 0 on
  * failure.
  */
-static int parse_transaction_path(PyObject *self, PyObject *args,
-                                  PyObject *kwds,
+static int parse_transaction_path(XsHandle *self, PyObject *args,
                                   struct xs_handle **xh,
                                   struct xs_transaction_handle **th,
                                   char **path)
 {
-    static char *arg_spec = "ss";
-    static char *kwd_spec[] = { "transaction", "path", NULL };
     char *thstr;
 
     *xh = xshandle(self);
@@ -802,8 +736,7 @@
     if (!xh)
         return 0;
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, arg_spec, kwd_spec,
-                                     &thstr, path))
+    if (!PyArg_ParseTuple(args, "ss", &thstr, path))
         return 0;
 
     *th = (struct xs_transaction_handle *)strtoul(thstr, NULL, 16);
@@ -825,30 +758,30 @@
 }
 
 
-#define XSPY_METH(_name) {                     \
+#define XSPY_METH(_name, _args) {               \
     .ml_name  = #_name,                                \
     .ml_meth  = (PyCFunction) xspy_ ## _name,  \
-    .ml_flags = (METH_VARARGS | METH_KEYWORDS),        \
+    .ml_flags = _args,                          \
     .ml_doc   = xspy_ ## _name ## _doc }
 
 static PyMethodDef xshandle_methods[] = {
-     XSPY_METH(read),
-     XSPY_METH(write),
-     XSPY_METH(ls),
-     XSPY_METH(mkdir),
-     XSPY_METH(rm),
-     XSPY_METH(get_permissions),
-     XSPY_METH(set_permissions),
-     XSPY_METH(watch),
-     XSPY_METH(read_watch),
-     XSPY_METH(unwatch),
-     XSPY_METH(transaction_start),
-     XSPY_METH(transaction_end),
-     XSPY_METH(introduce_domain),
-     XSPY_METH(release_domain),
-     XSPY_METH(close),
-     XSPY_METH(get_domain_path),
-     { /* Terminator. */ },
+    XSPY_METH(read,              METH_VARARGS),
+    XSPY_METH(write,             METH_VARARGS),
+    XSPY_METH(ls,                METH_VARARGS),
+    XSPY_METH(mkdir,             METH_VARARGS),
+    XSPY_METH(rm,                METH_VARARGS),
+    XSPY_METH(get_permissions,   METH_VARARGS),
+    XSPY_METH(set_permissions,   METH_VARARGS),
+    XSPY_METH(watch,             METH_VARARGS),
+    XSPY_METH(read_watch,        METH_NOARGS),
+    XSPY_METH(unwatch,           METH_VARARGS),
+    XSPY_METH(transaction_start, METH_NOARGS),
+    XSPY_METH(transaction_end,   METH_VARARGS | METH_KEYWORDS),
+    XSPY_METH(introduce_domain,  METH_VARARGS),
+    XSPY_METH(release_domain,    METH_VARARGS),
+    XSPY_METH(close,             METH_NOARGS),
+    XSPY_METH(get_domain_path,   METH_VARARGS),
+    { NULL /* Sentinel. */ },
 };
 
 static PyObject *xshandle_getattr(PyObject *self, char *name)

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