129 lines
5.1 KiB
C
129 lines
5.1 KiB
C
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/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)exf.h 8.35 (Berkeley) 8/4/94
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*/
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/* Undo direction. */
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/*
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* exf --
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* The file structure.
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*/
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struct _exf {
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int refcnt; /* Reference count. */
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/* Underlying database state. */
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DB *db; /* File db structure. */
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char *c_lp; /* Cached line. */
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size_t c_len; /* Cached line length. */
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recno_t c_lno; /* Cached line number. */
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recno_t c_nlines; /* Cached lines in the file. */
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DB *log; /* Log db structure. */
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char *l_lp; /* Log buffer. */
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size_t l_len; /* Log buffer length. */
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recno_t l_high; /* Log last + 1 record number. */
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recno_t l_cur; /* Log current record number. */
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MARK l_cursor; /* Log cursor position. */
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enum direction lundo; /* Last undo direction. */
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LIST_HEAD(_markh, _lmark) marks;/* Linked list of file MARK's. */
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time_t mtime; /* Last modification time. */
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int fcntl_fd; /* Fcntl locking fd; see exf.c. */
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/*
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* Recovery in general, and these fields specifically, are described
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* in recover.c.
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*/
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#define RCV_PERIOD 120 /* Sync every two minutes. */
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char *rcv_path; /* Recover file name. */
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char *rcv_mpath; /* Recover mail file name. */
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int rcv_fd; /* Locked mail file descriptor. */
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struct timeval rcv_tod; /* ITIMER_REAL: recovery time-of-day. */
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#define F_FIRSTMODIFY 0x001 /* File not yet modified. */
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#define F_MODIFIED 0x002 /* File is currently dirty. */
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#define F_MULTILOCK 0x004 /* Multiple processes running, lock. */
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#define F_NOLOG 0x008 /* Logging turned off. */
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#define F_RCV_NORM 0x010 /* Don't delete recovery files. */
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#define F_RCV_ON 0x020 /* Recovery is possible. */
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#define F_UNDO 0x040 /* No change since last undo. */
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u_int8_t flags;
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};
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#define GETLINE_ERR(sp, lno) { \
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msgq(sp, M_ERR, \
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"Error: %s/%d: unable to retrieve line %u", \
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tail(__FILE__), __LINE__, lno); \
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}
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/* EXF routines. */
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FREF *file_add __P((SCR *, CHAR_T *));
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int file_end __P((SCR *, EXF *, int));
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int file_init __P((SCR *, FREF *, char *, int));
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int file_m1 __P((SCR *, EXF *, int, int));
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int file_m2 __P((SCR *, EXF *, int));
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int file_m3 __P((SCR *, EXF *, int));
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enum lockt { LOCK_FAILED, LOCK_SUCCESS, LOCK_UNAVAIL };
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enum lockt
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file_lock __P((char *, int *, int, int));
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#define FS_ALL 0x01 /* Write the entire file. */
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#define FS_APPEND 0x02 /* Append to the file. */
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#define FS_FORCE 0x04 /* Force is set. */
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#define FS_POSSIBLE 0x08 /* Force could be set. */
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int file_write __P((SCR *, EXF *, MARK *, MARK *, char *, int));
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/* Recovery routines. */
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int rcv_init __P((SCR *, EXF *));
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int rcv_list __P((SCR *));
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int rcv_on __P((SCR *, EXF *));
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int rcv_read __P((SCR *, FREF *));
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#define RCV_EMAIL 0x01 /* Send the user email, IFF file modified. */
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#define RCV_ENDSESSION 0x02 /* End the file session. */
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#define RCV_PRESERVE 0x04 /* Preserve backup file, IFF file modified. */
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#define RCV_SNAPSHOT 0x08 /* Snapshot the recovery, and send email. */
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int rcv_sync __P((SCR *, EXF *, u_int));
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int rcv_tmp __P((SCR *, EXF *, char *));
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/* DB interface routines */
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int file_aline __P((SCR *, EXF *, int, recno_t, char *, size_t));
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int file_dline __P((SCR *, EXF *, recno_t));
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char *file_gline __P((SCR *, EXF *, recno_t, size_t *));
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int file_iline __P((SCR *, EXF *, recno_t, char *, size_t));
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int file_lline __P((SCR *, EXF *, recno_t *));
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char *file_rline __P((SCR *, EXF *, recno_t, size_t *));
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int file_sline __P((SCR *, EXF *, recno_t, char *, size_t));
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