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/*
* SCCS: @(#)lock.c 1.5 (98/09/01)
*
* UniSoft Ltd., London, England
*
* (C) Copyright 1996 X/Open Company Limited
*
* All rights reserved. No part of this source code may be reproduced,
* stored in a retrieval system, or transmitted, in any form or by any
* means, electronic, mechanical, photocopying, recording or otherwise,
* except as stated in the end-user licence agreement, without the prior
* permission of the copyright owners.
* A copy of the end-user licence agreement is contained in the file
* Licence which accompanies this distribution.
*
* X/Open and the 'X' symbol are trademarks of X/Open Company Limited in
* the UK and other countries.
*/
#ifndef lint
static char sccsid[] = "@(#)lock.c 1.5 (98/09/01) TET3 release 3.3";
#endif
/************************************************************************
SCCS: @(#)lock.c 1.5 98/09/01 TETware release 3.3
NAME: lock.c
PRODUCT: TETware
AUTHOR: Andrew Dingwall, UniSoft Ltd.
DATE CREATED: August 1996
DESCRIPTION:
testcase locking functions
MODIFICATIONS:
Andrew Dingwall, UniSoft Ltd., July 1998
Added support for shared API libraries.
************************************************************************/
#include <stdio.h>
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#include "dtmac.h"
#include "dtmsg.h"
#include "error.h"
#include "globals.h"
#include "ltoa.h"
#include "servlib.h"
#include "scentab.h"
#include "proctab.h"
#include "tcc.h"
#include "tcclib.h"
#ifdef NEEDsrcFile
static char srcFile[] = __FILE__; /* file name for error reporting */
#endif
/*
** tcc_lock() - acquire a shared lock or an exclusive lock
**
** return 0 if successful or -1 on error
**
** if successful, the name of the created lock is returned in lkname[]
**
** failure to acquire a lock on a read-only file system is not
** treated as an error; in this case an empty string is returned
*/
int tcc_lock(prp, shared, dir, lkname, lknamelen)
struct proctab *prp;
int shared, lknamelen;
char *dir, lkname[];
{
static char fmt[] = "can't acquire %s lock";
char msg[sizeof fmt + 9];
char lkpath[MAXPATH];
char *lktype, *lnp;
int err, rc;
fullpath(dir, "tet_lock", lkpath, sizeof lkpath, *prp->pr_sys ? 1 : 0);
errno = 0;
if (shared) {
lktype = "shared";
#ifdef TET_LITE /* -LITE-CUT-LINE- */
if ((tet_tcerrno = tcf_sharelock(lkpath, (long) tet_mypid, tcc_timeout, &lnp)) != ER_OK)
lnp = (char *) 0;
#else /* -START-LITE-CUT- */
lnp = tet_tcsharelock(*prp->pr_sys, lkpath, tcc_timeout);
#endif /* TET_LITE */ /* -END-LITE-CUT- */
}
else {
lktype = "exclusive";
#ifdef TET_LITE /* -LITE-CUT-LINE- */
tet_tcerrno = tcf_lockfile(lkpath, tcc_timeout);
rc = (tet_tcerrno == ER_OK) ? 0 : -1;
#else /* -START-LITE-CUT- */
rc = tet_tclockfile(*prp->pr_sys, lkpath, tcc_timeout);
#endif /* TET_LITE */ /* -END-LITE-CUT- */
lnp = (rc < 0) ? (char *) 0 : lkpath;
}
/* handle an error return */
if (!lnp) {
if (!IS_ER_ERRNO(tet_tcerrno))
errno = 0;
switch (errno) {
case EROFS:
lkname[0] = '\0';
return(0);
case ENOTDIR:
err = 0;
break;
default:
err = errno ? errno : tet_tcerrno;
break;
}
(void) sprintf(msg, fmt, lktype);
prperror(prp, *prp->pr_sys, err, msg, lkpath);
return(-1);
}
TRACE4(tet_Ttcc, 4, "created %s lock %s on system %s",
lktype, lnp, tet_i2a(*prp->pr_sys));
(void) sprintf(lkname, "%.*s", lknamelen, lnp);
return(0);
}
/*
** tcc_unlock() - remove a lock
**
** return 0 if successful or -1 on error
*/
int tcc_unlock(prp, shared, lkname)
struct proctab *prp;
int shared;
char *lkname;
{
static char fmt[] = "can't remove %s lock%s";
char msg[sizeof fmt + 20];
char *lktype;
char lkdir[MAXPATH];
int rc = 0;
if (shared)
lktype = "shared";
else
lktype = "exclusive";
/* remove the lock file */
errno = 0;
if (tcc_unlink(*prp->pr_sys, lkname) < 0) {
(void) sprintf(msg, fmt, lktype, "");
prperror(prp, *prp->pr_sys, errno ? errno : tet_tcerrno,
msg, lkname);
rc = -1;
}
else {
TRACE4(tet_Ttcc, 4, "removed %s lock %s on system %s",
lktype, lkname, tet_i2a(*prp->pr_sys));
}
/* return now if the lock was an exclusive lock */
if (!shared)
return(rc);
/*
** for a shared lock, attempt to remove the lock directory as well;
** it is OK for this call to fail because the directory is not empty
** or because someone else has removed it before we had a chance to
*/
tcc_dirname(lkname, lkdir, sizeof lkdir);
errno = 0;
if (tcc_rmdir(*prp->pr_sys, lkdir) < 0)
switch (errno) {
case EEXIST:
case ENOENT:
#ifdef ENOTEMPTY /* band-aid for non-POSIX systems */
case ENOTEMPTY:
#endif
break;
default:
(void) sprintf(msg, fmt, lktype, " directory");
prperror(prp, *prp->pr_sys, errno ? errno : tet_tcerrno,
msg, lkdir);
rc = -1;
}
else {
TRACE4(tet_Ttcc, 4, "removed %s lock directory %s on system %s",
lktype, lkdir, tet_i2a(*prp->pr_sys));
}
return(rc);
}
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