openldap/servers/slapd/lock.c

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/* lock.c - routines to open and apply an advisory lock to a file */
/* $OpenLDAP$ */
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/*
* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/param.h>
#include <ac/string.h>
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#include <ac/socket.h>
#include <ac/time.h>
#include <ac/unistd.h>
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#include "slap.h"
FILE *
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lock_fopen( const char *fname, const char *type, FILE **lfp )
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{
FILE *fp;
char buf[MAXPATHLEN];
/* open the lock file */
strcpy( buf, fname );
strcat( buf, ".lock" );
if ( (*lfp = fopen( buf, "w" )) == NULL ) {
Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", buf, 0, 0 );
return( NULL );
}
/* acquire the lock */
ldap_lockf( fileno(*lfp) );
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/* open the log file */
if ( (fp = fopen( fname, type )) == NULL ) {
Debug( LDAP_DEBUG_ANY, "could not open \"%s\"\n", fname, 0, 0 );
ldap_unlockf( fileno(*lfp) );
fclose( *lfp );
*lfp = NULL;
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return( NULL );
}
return( fp );
}
int
lock_fclose( FILE *fp, FILE *lfp )
{
/* unlock */
ldap_unlockf( fileno(lfp) );
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fclose( lfp );
return( fclose( fp ) );
}