Sprite 1984 - 1993/Sprite 1984 - 1993.iso/src/lib/c/db/RCS/Db_Open.c,v

Text File | 1989-06-16 | 4.7 KB | 225 lines

head     1.6;
branch   ;
access   ;
symbols  ;
locks    ; strict;
comment  @ * @;


1.6
date     89.06.15.22.45.11;  author douglis;  state Exp;
branches ;
next     1.5;

1.5
date     89.01.13.11.44.27;  author douglis;  state Exp;
branches ;
next     1.4;

1.4
date     89.01.02.13.42.12;  author douglis;  state Exp;
branches ;
next     1.3;

1.3
date     88.09.22.22.11.59;  author douglis;  state Exp;
branches ;
next     1.2;

1.2
date     88.09.15.10.15.27;  author douglis;  state Exp;
branches ;
next     1.1;

1.1
date     88.08.14.15.08.28;  author douglis;  state Exp;
branches ;
next     ;


desc
@Procedure to open a 'database' file.
@


1.6
log
@create database file if not already there
@
text
@/*
 * Db_Open.c --
 *
 *    Source code for the Db_Open procedure.
 *
 * Copyright 1988 Regents of the University of California
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */

#ifndef lint
static char rcsid[] = "$Header: /sprite/src/lib/c/db/RCS/Db_Open.c,v 1.5 89/01/13 11:44:27 douglis Exp Locker: douglis $ SPRITE (Berkeley)";
#endif not lint


#include <db.h>
#include <errno.h>
#include "dbInt.h"


/*
 *----------------------------------------------------------------------
 *
 * Db_Open --
 *
 *    Open a system data file and return a handle to it.
 *
 * Results:
 *    The handle is returned in *handlePtr.
 *    On error, -1 is returned, otherwise 0 is returned.
 *
 * Side effects:
 *    The file is opened and (optionally) locked.
 *
 *----------------------------------------------------------------------
 */

int
Db_Open(file, size, handlePtr, writing, lockWhen, lockHow, numBuf)
    char *file;
    int size;
    Db_Handle *handlePtr;
    int writing;         /* 1 if opening for writing */
    Db_LockWhen lockWhen;
    Db_LockHow lockHow;
    int numBuf;            /* number of records to buffer */
{
    int streamID;

    streamID = open(file, (writing ? O_RDWR : O_RDONLY) | O_CREAT, FILE_MODE);
    if (streamID == -1) {
    syslog(LOG_ERR, "Db_Open: error opening file %s: %s.\n", file,
           strerror(errno));
    return(-1);
    }

    /*
     * Don't allow buffering for files locked a record at a time.
     */
    if (numBuf > 0 &&
    (lockWhen == DB_LOCK_ACCESS || lockWhen == DB_LOCK_READ_MOD_WRITE)) {
    errno = EINVAL;
    return(-1);
    }

    handlePtr->index = 0;
    handlePtr->structSize = size;
    handlePtr->lockType = writing ? LOCK_EX : LOCK_SH;
    handlePtr->lockWhen = lockWhen;
    handlePtr->lockHow = lockHow;
    handlePtr->streamID = streamID;
    handlePtr->firstRec = -1;
    handlePtr->numBuf = numBuf;
    if (numBuf > 0) {
    handlePtr->buffer = malloc((unsigned) numBuf * size);
    } else {
    handlePtr->buffer = (char *) NULL;
    }
#ifndef CLEAN
    handlePtr->fileName = malloc((unsigned) strlen(file) + 1);
    (void) strcpy(handlePtr->fileName, file);
#endif /* CLEAN */


    if (lockWhen == DB_LOCK_OPEN) {
    return(DbLockDesc(handlePtr));
    }
    return(0);
}
@


1.5
log
@changed for buffering and for new arg passing to lock routine.
[generic checkin msg].
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: /sprite/src/lib/c/db/RCS/Db_Open.c,v 1.4 89/01/02 13:42:12 douglis Exp Locker: douglis $ SPRITE (Berkeley)";
d22 1
d55 1
a55 1
    streamID = open(file, writing ? O_RDWR : O_RDONLY, FILE_MODE);
@


1.4
log
@open in RDWR mode rather than WRONLY mode if we're writing, 'cause
we might also be reading.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: /sprite/src/lib/c/db/RCS/Db_Open.c,v 1.3 88/09/22 22:11:59 douglis Exp Locker: douglis $ SPRITE (Berkeley)";
d43 1
a43 1
Db_Open(file, size, handlePtr, writing, lockWhen, lockHow)
d50 1
d61 9
d76 12
d90 1
a90 1
    return(DbLockDesc(streamID, handlePtr->lockType, lockHow));
@


1.3
log
@Changed some arg. orders, var. names, and Db_LockDesc to DbLockDesc.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: Db_Open.c,v 1.2 88/09/15 10:15:27 douglis Exp $ SPRITE (Berkeley)";
d53 1
a53 1
    streamID = open(file, writing ? O_WRONLY : O_RDONLY, FILE_MODE);
@


1.2
log
@when printing syslog message about error opening file, print the strerror
corresponding to it.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: Db_Open.c,v 1.1 88/08/14 15:08:28 douglis Exp $ SPRITE (Berkeley)";
d68 1
a68 1
    return(Db_LockDesc(streamID, handlePtr->lockType, lockHow));
@


1.1
log
@Initial revision
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: proto.c,v 1.2 88/03/11 08:39:08 ouster Exp $ SPRITE (Berkeley)";
d55 2
a56 1
    syslog(LOG_ERR, "Db_Open: error opening file %s.\n", file);
@