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/* cygserver_shm.h: Single unix specification IPC interface for Cygwin.
Copyright 2002 Red Hat, Inc.
Written by Conrad Scott <conrad.scott@dsl.pipex.com>.
Based on code by Robert Collins <robert.collins@hotmail.com>.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef __CYGSERVER_SHM_H__
#define __CYGSERVER_SHM_H__
#include <sys/types.h>
#include <cygwin/shm.h>
#include <assert.h>
#include <limits.h>
#include "cygserver_ipc.h"
#include "cygwin/cygserver.h"
/*---------------------------------------------------------------------------*
* Values for the shminfo entries.
*
* Nb. The values are segregated between two enums so that the `small'
* values aren't promoted to `unsigned long' equivalents.
*---------------------------------------------------------------------------*/
enum
{
SHMMAX = ULONG_MAX,
SHMSEG = ULONG_MAX,
SHMALL = ULONG_MAX
};
enum
{
SHMMIN = 1,
SHMMNI = IPCMNI // Must be <= IPCMNI.
};
/*---------------------------------------------------------------------------*
* class client_request_shm
*---------------------------------------------------------------------------*/
#ifndef __INSIDE_CYGWIN__
class transport_layer_base;
class process_cache;
#endif
class client_request_shm : public client_request
{
friend class client_request;
public:
enum shmop_t
{
SHMOP_shmat,
SHMOP_shmctl,
SHMOP_shmdt,
SHMOP_shmget
};
#ifdef __INSIDE_CYGWIN__
client_request_shm (int shmid, int shmflg); // shmat
client_request_shm (int shmid, int cmd, const struct shmid_ds *); // shmctl
client_request_shm (int shmid); // shmdt
client_request_shm (key_t, size_t, int shmflg); // shmget
#endif
// Accessors for out parameters.
int shmid () const
{
assert (!error_code ());
return _parameters.out.shmid;
}
HANDLE hFileMap () const
{
assert (!error_code ());
return _parameters.out.hFileMap;
}
const struct shmid_ds & ds () const
{
assert (!error_code ());
return _parameters.out.ds;
}
const struct shminfo & shminfo () const
{
assert (!error_code ());
return _parameters.out.shminfo;
}
const struct shm_info & shm_info () const
{
assert (!error_code ());
return _parameters.out.shm_info;
}
private:
union
{
struct
{
shmop_t shmop;
key_t key;
size_t size;
int shmflg;
int shmid;
int cmd;
pid_t cygpid;
DWORD winpid;
uid_t uid;
gid_t gid;
struct shmid_ds ds;
} in;
struct {
int shmid;
union
{
HANDLE hFileMap;
struct shmid_ds ds;
struct shminfo shminfo;
struct shm_info shm_info;
};
} out;
} _parameters;
#ifndef __INSIDE_CYGWIN__
client_request_shm ();
#endif
#ifndef __INSIDE_CYGWIN__
virtual void serve (transport_layer_base *, process_cache *);
#endif
};
#endif /* __CYGSERVER_SHM_H__ */
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