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// -*-c++-*-
/* $Id: aiod_prot.h,v 1.5 1999/11/12 03:37:29 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _AIOD_AIOD_PROT_H_
#define _AIOD_AIOD_PROT_H_ 1
#include "sysconf.h"
typedef size_t aiomsg_t;
/* File handle type. Arguments containing file handles contain an
* aiomsg_t with the position of an aiod_file structure in the shared
* memory buffer. */
struct aiod_file {
int handle;
int oflags;
dev_t dev;
ino_t ino;
char path[1];
};
struct aiod_iobuf {
off_t pos; // Position in file
aiomsg_t buf; // Position in shared mem of buffer
ssize_t len; // Size of buffer/operation
};
enum aiod_op {
AIOD_NOP = 0,
/* Requests taking aiod_pathop */
AIOD_UNLINK = 1,
AIOD_LINK = 2,
AIOD_SYMLINK = 3,
AIOD_RENAME = 4,
AIOD_READLINK = 5,
AIOD_STAT = 6,
AIOD_LSTAT = 7,
AIOD_GETCWD = 8,
/* Requests take an aiod_fhop */
AIOD_OPEN = 9,
AIOD_CLOSE = 10,
AIOD_FSYNC = 11,
AIOD_FTRUNC = 12,
AIOD_READ = 13,
AIOD_WRITE = 14,
/* fstat is special */
AIOD_FSTAT = 15,
};
/* Common header for all requests */
struct aiod_reqhdr {
aiod_op op;
int err;
};
struct aiod_nop {
aiod_op op;
int err;
size_t nopsize;
};
/* Argument for operations that take pathnames */
struct aiod_pathop {
aiod_op op;
int err;
size_t bufsize;
union {
off_t __alignment_hack;
char pathbuf[2]; // 1 or 2 null-terminated paths in arg
};
char *path1 () { return pathbuf; }
char *path2 () { return pathbuf + 1 + strlen (pathbuf); }
struct stat *statbuf () {
#ifdef XXX_CHECK_BOUNDS // Can't trust aiod's not to clobber bufsize
assert (sizeof (struct stat) <= bufsize);
#endif /* CHECK_BOUNDS */
return reinterpret_cast<struct stat *> (pathbuf);
}
void setpath (const char *p1, const char *p2 = "") {
size_t len1 = strlen (p1);
#ifdef XXX_CHECK_BOUNDS
assert (len1 + 2 + strlen (p2) <= bufsize);
#endif /* CHECK_BOUNDS */
strcpy (pathbuf, p1);
strcpy (pathbuf + len1 + 1, p2);
}
static size_t totsize (size_t bufsize);
};
inline size_t
aiod_pathop::totsize (size_t bufsize)
{
return offsetof (aiod_pathop, pathbuf) + bufsize;
}
/* Argument for most operations that take a file handle */
struct aiod_fhop {
aiod_op op;
int err;
aiomsg_t fh; // Pointer to file handle
union {
mode_t mode; // For open
off_t length; // For trunc
aiod_iobuf iobuf; // For read, write
};
};
/* Argument for fstat */
struct aiod_fstat {
aiod_op op;
int err;
aiomsg_t fh; // Pointer to file handle
struct stat statbuf;
};
#endif /* !_AIOD_AIOD_PROT_H_ */
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