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

Text File | 1989-06-16 | 4.7 KB | 232 lines

head     1.5;
branch   ;
access   ;
symbols  ;
locks    ; strict;
comment  @ * @;


1.5
date     89.06.15.22.45.33;  author douglis;  state Exp;
branches ;
next     1.4;

1.4
date     89.01.13.11.44.35;  author douglis;  state Exp;
branches ;
next     1.3;

1.3
date     88.09.22.22.12.15;  author douglis;  state Exp;
branches ;
next     1.2;

1.2
date     88.09.13.16.49.39;  author douglis;  state Exp;
branches ;
next     1.1;

1.1
date     88.08.14.15.09.14;  author douglis;  state Exp;
branches ;
next     ;


desc
@Procedure to open and lock a database file, write a record, and close it
again.
@


1.5
log
@create database file if not already there
@
text
@/*
 * Db_WriteEntry.c --
 *
 *    Source code for the Db_WriteEntry 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_WriteEntry.c,v 1.4 89/01/13 11:44:35 douglis Exp Locker: douglis $ SPRITE (Berkeley)";
#endif not lint


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


/*
 *----------------------------------------------------------------------
 *
 * Db_WriteEntry --
 *
 *    Write a buffer into a specified location in the shared database.
 *    This opens and locks the file, writes the data, and closes the
 *    file.  The lock is polled if necessary.  The file is opened with
 *    the default mode as defined above.
 *
 * Results:
 *    -1 indicates an error, in which case errno indicates more details.
 *    0 indicates success.
 *
 * Side effects:
 *    The global database is modified.
 *
 *----------------------------------------------------------------------
 */

int
Db_WriteEntry(file, buffer, index, size, lockHow)
    char *file;
    char *buffer;
    int index;
    int size;
    Db_LockHow lockHow;
{
    int status;
    int offset;
    int streamID;
    int bytesWritten;
    Db_Handle handle;

#ifdef DEBUG_DB
    syslog(LOG_INFO, "Debug msg: Db_WriteEntry(%s) called.", file);
#endif
    streamID = open(file, O_WRONLY | O_CREAT, FILE_MODE);
    if (streamID == -1) {
    syslog(LOG_ERR, "Db_WriteEntry: error opening file %s: %s.\n", file,
           strerror(errno));
    return(streamID);
    }

    offset = index * size;
    status = lseek(streamID, (long) offset, L_SET);
    if (status == -1) {
    return(status);
    }
    /*
     * Fake a Db_Handle for DbLockDesc.
     */
    handle.streamID = streamID;
    handle.lockHow = lockHow;
    handle.lockType = LOCK_EX;
#ifndef CLEAN
    handle.fileName = file;
#endif /* CLEAN */
    status = DbLockDesc(&handle);
    if (status == -1) {
#ifdef DEBUG_DB
    syslog(LOG_INFO, "Debug msg: Db_WriteEntry(%s) returning %x.", file, status);
#endif
    return(status);
    }

    bytesWritten = write(streamID, buffer, size);
    if (bytesWritten == -1) {
    status = -1;
    } else if (bytesWritten != size) {
    status = -1;
    errno = 0;
    } else {
    status = 0;
    }
    (void) flock(streamID, LOCK_EX | LOCK_UN);
    (void) close(streamID);

#ifdef DEBUG_DB
    syslog(LOG_INFO, "Debug msg: Db_WriteEntry(%s) returning %x.", file, status);
#endif
    return(status);
}
@


1.4
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_WriteEntry.c,v 1.3 88/09/22 22:12:15 douglis Exp Locker: douglis $ SPRITE (Berkeley)";
d59 4
a62 1
    streamID = open(file, O_WRONLY, FILE_MODE);
d64 2
d85 3
d103 3
@


1.3
log
@Changed some arg. orders, var. names, and Db_LockDesc to DbLockDesc.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: Db_WriteEntry.c,v 1.2 88/09/13 16:49:39 douglis Exp $ SPRITE (Berkeley)";
d57 1
d69 10
a78 1
    status = DbLockDesc(streamID, LOCK_EX, lockHow);
@


1.2
log
@fixed some lint.
@
text
@d17 1
a17 1
static char rcsid[] = "$Header: Db_WriteEntry.c,v 1.1 88/08/14 15:09:14 douglis Exp $ SPRITE (Berkeley)";
d46 1
a46 1
Db_WriteEntry(file, index, bufSize, buf, lockHow)
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a50 2
    int bufSize;
    char *buf;
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a63 1
    offset = index * bufSize;
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a68 1
    status = Db_LockDesc(streamID, LOCK_EX, lockHow);
d73 1
a73 1
    bytesWritten = write(streamID, buf, bufSize);
d76 1
a76 1
    } else if (bytesWritten != bufSize) {
@


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)";
d64 1
a64 1
    status = lseek(streamID, offset, L_SET);
@