common/exf.h

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  *
   9  *      $Id: exf.h,v 10.9 2000/04/21 21:26:19 skimo Exp $ (Berkeley) $Date: 2000/04/21 21:26:19 $
  10  */
  11                                         /* Undo direction. */
  12 /*
  13  * exf --
  14  *      The file structure.
  15  */
  16 struct _exf {
  17         int      refcnt;                /* Reference count. */
  18
  19                                         /* Underlying database state. */
  20         DB      *db;                    /* File db structure. */
  21         char    *c_lp;                  /* Cached line. */
  22         size_t   c_len;                 /* Cached line length. */
  23         db_recno_t       c_lno;                 /* Cached line number. */
  24         db_recno_t       c_nlines;              /* Cached lines in the file. */
  25
  26         DB      *log;                   /* Log db structure. */
  27         char    *l_lp;                  /* Log buffer. */
  28         size_t   l_len;                 /* Log buffer length. */
  29         db_recno_t       l_high;                /* Log last + 1 record number. */
  30         db_recno_t       l_cur;                 /* Log current record number. */
  31         MARK     l_cursor;              /* Log cursor position. */
  32         dir_t    lundo;                 /* Last undo direction. */
  33
  34         LIST_HEAD(_markh, _lmark) marks;/* Linked list of file MARK's. */
  35
  36         /*
  37          * XXX
  38          * Mtime should be a struct timespec, but time_t is more portable.
  39          */
  40         dev_t    mdev;                  /* Device. */
  41         ino_t    minode;                /* Inode. */
  42         time_t   mtime;                 /* Last modification time. */
  43
  44         int      fcntl_fd;              /* Fcntl locking fd; see exf.c. */
  45         int      fd;                    /* File descriptor */
  46
  47         /*
  48          * Recovery in general, and these fields specifically, are described
  49          * in recover.c.
  50          */
  51 #define RCV_PERIOD      120             /* Sync every two minutes. */
  52         char    *rcv_path;              /* Recover file name. */
  53         char    *rcv_mpath;             /* Recover mail file name. */
  54         int      rcv_fd;                /* Locked mail file descriptor. */
  55
  56 #define F_DEVSET        0x001           /* mdev/minode fields initialized. */
  57 #define F_FIRSTMODIFY   0x002           /* File not yet modified. */
  58 #define F_MODIFIED      0x004           /* File is currently dirty. */
  59 #define F_MULTILOCK     0x008           /* Multiple processes running, lock. */
  60 #define F_NOLOG         0x010           /* Logging turned off. */
  61 #define F_RCV_NORM      0x020           /* Don't delete recovery files. */
  62 #define F_RCV_ON        0x040           /* Recovery is possible. */
  63 #define F_UNDO          0x080           /* No change since last undo. */
  64         u_int8_t flags;
  65 };
  66
  67 /* Flags to db_get(). */
  68 #define DBG_FATAL       0x001   /* If DNE, error message. */
  69 #define DBG_NOCACHE     0x002   /* Ignore the front-end cache. */
  70
  71 /* Flags to file_init() and file_write(). */
  72 #define FS_ALL          0x001   /* Write the entire file. */
  73 #define FS_APPEND       0x002   /* Append to the file. */
  74 #define FS_FORCE        0x004   /* Force is set. */
  75 #define FS_OPENERR      0x008   /* Open failed, try it again. */
  76 #define FS_POSSIBLE     0x010   /* Force could have been set. */
  77 #define FS_SETALT       0x020   /* Set alternate file name. */
  78
  79 /* Flags to rcv_sync(). */
  80 #define RCV_EMAIL       0x01    /* Send the user email, IFF file modified. */
  81 #define RCV_ENDSESSION  0x02    /* End the file session. */
  82 #define RCV_PRESERVE    0x04    /* Preserve backup file, IFF file modified. */
  83 #define RCV_SNAPSHOT    0x08    /* Snapshot the recovery, and send email. */