Dbxlocki()

PURPOSE

lock tagged index file

SYNOPSIS

#include "dbl.h"
 
	int	dbxlocki(dbx)
 
	<input parameters>
	char	*dbx;		/* Tagged index file pointer */
 
	<output parameters>
	none

RETURN VALUE

The dbxlocki() function returns 0 for success, or < 0 if an error occurs. See the section on return code values for a detailed list of return codes.

DESCRIPTION

The dbxlocki() function locks the specified tagged index file, .DBX.

EXAMPLE

The following example opens the table and tag index, locks the table and tag index, adds in records, flushes the buffers, then unlocks and closes the files.

#include <stdio.h>
#include "dbl.h"			/* Recital/Library include file */
#include "dblproto.h"		/* Recital/Library prototype file */
 
	static	dBFIELD fields[6] = {
		"VESSEL",	'C',	18,	0,	0,
		"LAT",	'N',	4,	1,	0,
		"LONG",	'N',	4,	1,	0,
		"AMOUNT",	'N',	10,	0,	0,
		"DATE",	'D',	8,	0,	0,
		"FLAG",	'C',	9,	0,	0
	};
 
	static void errorproc(
		char	*func,
		char	*str,
		int	rc);
 
	static char *text_table[] =  {
		"Santa Margarita   80.027.5   700000095/01/01Spanish  ",
		"Santa Rosa	  81.824.8  3000000032/01/01Spanish  ",
		"Unknown galleon   83.123.0	   015/01/01Spanish  ",
		"Jessie		97.127.4    10000075/01/01U.S.     ",
		"Lea		   96.227.8   100000080/01/01U.S.     ",
		"S.J. Lee	    96.926.9    20000075/01/01U.S.     ",
		"Genovase	    78.418.4   185000030/01/01Spanish  ",
		"Unknown Vessel    77.517.9	   075/01/01U.S.     "
	};
 
	main()
	{
		int	rc; 			/* Return Code for error handling */
		char	*dbf; 		/* File descriptor for table */
		char	*dbx; 		/* File descriptor for tagged index */
		int	i;	 		/* Loop control variable */
		long	recno; 		/* Table record variable */
 
		rc = dbdcache(100);
		errorproc("dbdcache()","table cache specified.", rc);
		rc = dbicache(100);
		errorproc("dbicache()", "index cache specified.",rc);
		rc = dbfilemode(1,0);
		rc = dbopen("shipwreck.dbf", &dbf);
		errorproc("dbopen()","table opened in shared mode.", rc);
 
		rc = dbxopen(dbf, "shipwreck.dbx", &dbx);
		errorproc("dbxopen()","tagged index opened.", rc);
 
		for( i = 1; i <= 7; i++)  {
			rc = dbappend(dbf, text_table[i], &recno);
			errorproc("dbappend()", "record appended.", rc);
			rc = dbxlocki(dbx);
			errorproc("dbxlocki()",  "tagged index file locked.", rc);
			rc = dbxakey(dbx, recno);
			errorproc("dbxakey()",  "key added.", rc);
			rc = dbxunlocki(dbx);
			errorproc("dbxunlocki()",  "tagged index file unlocked.", rc);
	}
 
		rc = dbflush(dbf);
		errorproc("dbflush()", "table cache flushed.", rc);
		rc = dbxflsh(dbx);
		errorproc("dbxflsh()", "Tagged index cache flushed.", rc);
 
		rc = dbxclose(dbx);
		errorproc("dbxclose()", "tagged index closed.", rc);
		rc = dbclose(dbf);
		errorproc("dbclose()", "table closed.", rc);
 
		exit(0);
}
 
	static void errorproc(func, str, rc)
	char	*func;
	char	*str;
	int	rc;
{
	if ( rc != SUCCESS ) {
		printf("\n  Error performing function %s -> %d\n", func, rc);
		exit(1);
	}
	printf("Function: \t%s, \t%s - Ok\n", func, str);
	return;
}

SEE ALSO

dbappend(), dbxakey(), dbxclose(), dbxflsh(), dbxopen(), dbxunlocki()