/*-------------------------------------------------------------------------
 *
 * libpq-fs.h--
 *    definitions for using Inversion file system routines
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: libpq-fs.h,v 1.1 1996/08/28 07:23:00 scrappy Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef LIBPQ_FS_H
#define LIBPQ_FS_H

#include "lib/dllist.h"
#include <sys/file.h>
#include <sys/stat.h>

#include <fcntl.h>		/* for O_ on some */
#ifndef WIN32
#include <unistd.h>		/* for SEEK_ on most */
#endif /* WIN32 */
#ifndef SEEK_SET
#include <stdio.h>		/* for SEEK_ on others */
#endif /* SEEK_SET */

/* UNIX compatibility junk.  This should be in all systems' include files,
   but this is not always the case. */

#ifndef MAXNAMLEN
#define MAXNAMLEN 255
#endif /* MAXNAMLEN */

struct pgdirent {
	unsigned long d_ino;
	unsigned short d_namlen;
	char d_name[MAXNAMLEN+1];
};

/*
 * SysV struct dirent doesn't have d_namlen.
 * This counts on d_name being last, which is moderately safe (ha) since 
 * it's the variable-length part of the structure.
 */
#ifdef SYSV_DIRENT
#define	D_NAMLEN(dp) \
	((dp)->d_reclen - offsetof(struct dirent, d_name[0]))
#else /* SYSV_DIRENT */
#define	D_NAMLEN(dp) \
	((dp)->d_namlen)
#endif /* SYSV_DIRENT */

/* for stat(2) */
#ifndef S_IRUSR
/* file modes */

#define S_IRWXU 00700           /* read, write, execute: owner */
#define S_IRUSR 00400           /*  read permission: owner */
#define S_IWUSR 00200           /*  write permission: owner */
#define S_IXUSR 00100           /*  execute permission: owner */

#define S_IRWXG 00070           /* read, write, execute: group */
#define S_IRGRP 00040           /*  read permission: group */
#define S_IWGRP 00020           /*  write permission: group */
#define S_IXGRP 00010           /*  execute permission: group */

#define S_IRWXO 00007           /* read, write, execute: other */
#define S_IROTH 00004           /*  read permission: other */
#define S_IWOTH 00002           /*  write permission: other */
#define S_IXOTH 00001           /*  execute permission: other */

#define _S_IFMT  0170000        /* type of file; sync with S_IFMT */
#define _S_IFBLK 0060000        /* block special; sync with S_IFBLK */
#define _S_IFCHR 0020000        /* character special sync with S_IFCHR */
#define _S_IFDIR 0040000        /* directory; sync with S_IFDIR */
#define _S_IFIFO 0010000        /* FIFO - named pipe; sync with S_IFIFO */
#define _S_IFREG 0100000        /* regular; sync with S_IFREG */

#define S_IFDIR _S_IFDIR
#define S_IFREG _S_IFREG

#define S_ISDIR( mode )         (((mode) & _S_IFMT) == _S_IFDIR)

#endif /* S_IRUSR */

/*
 * Inversion doesn't have links.
 */
#ifndef S_ISLNK
#define S_ISLNK(x) 0
#endif

/*
 *  Flags for inversion file system large objects.  Normally, creat()
 *  takes mode arguments, but we don't use them in inversion, since
 *  you get postgres protections.  Instead, we use the low sixteen bits
 *  of the integer mode argument to store the number of the storage
 *  manager to be used, and the high sixteen bits for flags.
 */

#define INV_SMGRMASK	0x0000ffff
#define	INV_ARCHIVE	0x00010000
#define	INV_WRITE	0x00020000
#define	INV_READ	0x00040000

/* Error values for p_errno */
#define PEPERM           1               /* Not owner */
#define PENOENT          2               /* No such file or directory */
#define PEACCES          13              /* Permission denied */
#define PEEXIST          17              /* File exists */
#define PENOTDIR         20              /* Not a directory*/
#define PEISDIR          21              /* Is a directory */
#define PEINVAL          22              /* Invalid argument */
#define PENAMETOOLONG    63              /* File name too long */
#define PENOTEMPTY       66              /* Directory not empty */
#define PEPGIO           99              /* postgres backend had problems */

#endif	/* LIBPQ_FS_H */
