[Xcb] [PATCH xcb-proto 1/3] xcbgen: Add support for lists of FDs

[Daniel Stone]

Add a special case in ListType to support lists of file descriptors,
which also requires explicit support within clients.

File descriptors are not supported as children of other complex types,
e.g. switch.

Signed-off-by: Daniel Stone <daniels at collabora.com>
---
 xcbgen/xtypes.py | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/xcbgen/xtypes.py b/xcbgen/xtypes.py
index c1f5986..1e270ae 100644
--- a/xcbgen/xtypes.py
+++ b/xcbgen/xtypes.py
@@ -42,6 +42,7 @@ class Type(object):
         self.is_case_or_bitcase = False
         self.is_bitcase = False
         self.is_case = False
+        self.is_fd = False
         self.required_start_align = Alignment()
 
         # the biggest align value of an align-pad contained in this type
@@ -68,7 +69,7 @@ class Type(object):
         '''
         raise Exception('abstract fixed_size method not overridden!')
 
-    def make_member_of(self, module, complex_type, field_type, field_name, visible, wire, auto, enum=None):
+    def make_member_of(self, module, complex_type, field_type, field_name, visible, wire, auto, enum=None, is_fd=False):
         '''
         Default method for making a data type a member of a structure.
         Extend this if the data type needs to add an additional length field or something.
@@ -77,7 +78,7 @@ class Type(object):
         complex_type is the structure object.
         see Field for the meaning of the other parameters.
         '''
-        new_field = Field(self, field_type, field_name, visible, wire, auto, enum)
+        new_field = Field(self, field_type, field_name, visible, wire, auto, enum, is_fd)
 
         # We dump the _placeholder_byte if any fields are added.
         for (idx, field) in enumerate(complex_type.fields):
@@ -217,6 +218,18 @@ tchar =  SimpleType(('char',), 1)
 tfloat = SimpleType(('float',), 4)
 tdouble = SimpleType(('double',), 8)
 
+class FileDescriptor(SimpleType):
+    '''
+    Derived class which represents a file descriptor.
+    '''
+    def __init__(self):
+        SimpleType.__init__(self, ('int'), 4)
+        self.is_fd = True
+
+    def fixed_size(self):
+        return True
+
+    out = __main__.output['simple']
 
 class Enum(SimpleType):
     '''
@@ -310,7 +323,9 @@ class ListType(Type):
                 type.make_member_of(module, complex_type, lenfield_type, lenfield_name, True, lenwire, False, enum)
 
         # Add ourself to the structure by calling our original method.
-        Type.make_member_of(self, module, complex_type, field_type, field_name, visible, wire, auto, enum)
+        if self.member.is_fd:
+            wire = False
+        Type.make_member_of(self, module, complex_type, field_type, field_name, visible, wire, auto, enum, self.member.is_fd)
 
     def resolve(self, module):
         if self.resolved:
@@ -532,7 +547,12 @@ class ComplexType(Type):
             elif child.tag == 'list':
                 field_name = child.get('name')
                 fkey = child.get('type')
-                type = ListType(child, module.get_type(fkey), *self.lenfield_parent)
+                if fkey == 'fd':
+                    ftype = FileDescriptor()
+                    fkey = 'INT32'
+                else:
+                    ftype = module.get_type(fkey)
+                type = ListType(child, ftype, *self.lenfield_parent)
                 visible = True
             elif child.tag == 'switch':
                 field_name = child.get('name')
-- 
2.12.2