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Turn Backend into a sensible classoid.

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Nearly every part of the code that ever handles a full backend
structure has historically done it using a pair of pointer variables,
one pointing at a constant struct full of function pointers, and the
other pointing to a 'void *' state object that's passed to each of
those.

While I'm modernising the rest of the code, this seems like a good
time to turn that into the same more or less type-safe and less
cumbersome system as I'm using for other parts of the code, such as
Socket, Plug, BinaryPacketProtocol and so forth: the Backend structure
contains a vtable pointer, and a system of macro wrappers handles
dispatching through that vtable.
This commit is contained in:
Simon Tatham
2018-09-11 16:23:38 +01:00
parent c51fe7c217
commit eefebaaa9e
36 changed files with 633 additions and 611 deletions
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5
defs.h
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@ -21,7 +21,6 @@
#endif
typedef struct conf_tag Conf;
typedef struct backend_tag Backend;
typedef struct terminal_tag Terminal;
typedef struct Filename Filename;
@ -44,10 +43,14 @@ typedef struct SockAddr_tag *SockAddr;
typedef struct Socket_vtable Socket_vtable;
typedef struct Plug_vtable Plug_vtable;
typedef struct Backend Backend;
typedef struct Backend_vtable Backend_vtable;
typedef struct Ldisc_tag Ldisc;
typedef struct LogContext_tag LogContext;
typedef struct ssh_tag *Ssh;
/* Note indirection: for historical reasons (it used to be closer to
* the OS socket type), the type that most code uses for a socket is
* 'Socket', not 'Socket *'. So an implementation of Socket or Plug