[ViewVC] Diff of: cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.4 by root, Sun Jul 10 20:57:00 2005 UTC vs.
Revision 1.18 by root, Sun Jul 31 19:00:31 2005 UTC

…		…
1	#define PERL_NO_GET_CONTEXT
2
3	#include "EXTERN.h"	1	#include "EXTERN.h"
4	#include "perl.h"	2	#include "perl.h"
5	#include "XSUB.h"	3	#include "XSUB.h"
6		4
		5	#include "autoconf/config.h"
		6
7	#include <sys/types.h>	7	#include <sys/types.h>
8	#include <sys/stat.h>	8	#include <sys/stat.h>
		9
9	#include <unistd.h>	10	#include <unistd.h>
10	#include <fcntl.h>	11	#include <fcntl.h>
11	#include <signal.h>	12	#include <signal.h>
12	#include <sched.h>	13	#include <sched.h>
		14
		15	#ifndef _REENTRANT
		16	# define _REENTRANT 1
		17	#endif
13	#include <endian.h>	18	#include <errno.h>
14		19
15	#include <pthread.h>	20	#include <pthread.h>
16	#include <sys/syscall.h>
17		21
18	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */	22	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
19	typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */	23	typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
20	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */	24	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
21		25
42	off_t offset;	46	off_t offset;
43	size_t length;	47	size_t length;
44	ssize_t result;	48	ssize_t result;
45	mode_t mode; /* open */	49	mode_t mode; /* open */
46	int errorno;	50	int errorno;
47	SV data, callback;	51	SV data, callback, *fh;
48	void *dataptr;	52	void *dataptr;
49	STRLEN dataoffset;	53	STRLEN dataoffset;
50		54
51	Stat_t *statdata;	55	Stat_t *statdata;
52	} aio_cb;	56	} aio_cb;
53		57
54	typedef aio_cb *aio_req;	58	typedef aio_cb *aio_req;
55		59
56	static int started;	60	static int started;
57	static int nreqs;	61	static volatile int nreqs;
58	static int max_outstanding = 1<<30;	62	static int max_outstanding = 1<<30;
59	static int respipe [2];	63	static int respipe [2];
60		64
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
62	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
…		…
66	static volatile aio_req ress, rese; /* queue start, queue end */	70	static volatile aio_req ress, rese; /* queue start, queue end */
67		71
68	static void	72	static void
69	poll_wait ()	73	poll_wait ()
70	{	74	{
71	if (!nreqs)	75	if (nreqs && !ress)
72	return;	76	{
73
74	fd_set rfd;	77	fd_set rfd;
75	FD_ZERO(&rfd);	78	FD_ZERO(&rfd);
76	FD_SET(respipe [0], &rfd);	79	FD_SET(respipe [0], &rfd);
77		80
78	select (respipe [0] + 1, &rfd, 0, 0, 0);	81	select (respipe [0] + 1, &rfd, 0, 0, 0);
		82	}
79	}	83	}
80		84
81	static int	85	static int
82	poll_cb (pTHX)	86	poll_cb ()
83	{	87	{
84	dSP;	88	dSP;
85	int count = 0;	89	int count = 0;
86	aio_req req;	90	aio_req req, prv;
87		91
		92	pthread_mutex_lock (&reslock);
		93
88	{	94	{
89	/* read and signals sent by the worker threads */	95	/* read any signals sent by the worker threads */
90	char buf [32];	96	char buf [32];
91	while (read (respipe [0], buf, 32) > 0)	97	while (read (respipe [0], buf, 32) > 0)
92	;	98	;
93	}	99	}
94		100
95	for (;;)	101	req = ress;
		102	ress = rese = 0;
		103
		104	pthread_mutex_unlock (&reslock);
		105
		106	while (req)
96	{	107	{
97	pthread_mutex_lock (&reslock);
98
99	req = ress;
100
101	if (ress)
102	{
103	ress = ress->next;
104	if (!ress) rese = 0;
105	}
106
107	pthread_mutex_unlock (&reslock);
108
109	if (!req)
110	break;
111
112	nreqs--;	108	nreqs--;
113		109
114	if (req->type == REQ_QUIT)	110	if (req->type == REQ_QUIT)
115	started--;	111	started--;
116	else	112	else
…		…
123	+ req->result > 0 ? req->result : 0);	119	+ req->result > 0 ? req->result : 0);
124		120
125	if (req->data)	121	if (req->data)
126	SvREFCNT_dec (req->data);	122	SvREFCNT_dec (req->data);
127		123
		124	if (req->fh)
		125	SvREFCNT_dec (req->fh);
		126
128	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)	127	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
129	{	128	{
130	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	129	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
131	PL_laststatval = req->result;	130	PL_laststatval = req->result;
132	PL_statcache = *(req->statdata);	131	PL_statcache = *(req->statdata);
133		132
134	Safefree (req->statdata);	133	Safefree (req->statdata);
135	}	134	}
136		135
		136	ENTER;
137	PUSHMARK (SP);	137	PUSHMARK (SP);
138	XPUSHs (sv_2mortal (newSViv (req->result)));	138	XPUSHs (sv_2mortal (newSViv (req->result)));
139		139
140	if (req->type == REQ_OPEN)	140	if (req->type == REQ_OPEN)
141	{	141	{
…		…
144		144
145	PUTBACK;	145	PUTBACK;
146	call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);	146	call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);
147	SPAGAIN;	147	SPAGAIN;
148		148
149	fh = POPs;	149	fh = SvREFCNT_inc (POPs);
150		150
151	PUSHMARK (SP);	151	PUSHMARK (SP);
152	XPUSHs (fh);	152	XPUSHs (sv_2mortal (fh));
153	}	153	}
154		154
		155	if (SvOK (req->callback))
		156	{
155	PUTBACK;	157	PUTBACK;
156	call_sv (req->callback, G_VOID \| G_EVAL);	158	call_sv (req->callback, G_VOID \| G_EVAL);
157	SPAGAIN;	159	SPAGAIN;
		160	}
		161
		162	LEAVE;
158		163
159	if (req->callback)	164	if (req->callback)
160	SvREFCNT_dec (req->callback);	165	SvREFCNT_dec (req->callback);
161		166
162	errno = errorno;	167	errno = errorno;
163	count++;	168	count++;
164	}	169	}
165		170
		171	prv = req;
		172	req = req->next;
166	Safefree (req);	173	Safefree (prv);
		174
		175	/* TODO: croak on errors? */
167	}	176	}
168		177
169	return count;	178	return count;
170	}	179	}
171		180
…		…
226	req->type = REQ_QUIT;	235	req->type = REQ_QUIT;
227		236
228	send_req (req);	237	send_req (req);
229	}	238	}
230		239
231	static void	240	/* work around various missing functions */
232	read_write (pTHX_
233	int dowrite, int fd, off_t offset, size_t length,
234	SV data, STRLEN dataoffset, SV callback)
235	{
236	aio_req req;
237	STRLEN svlen;
238	char *svptr = SvPV (data, svlen);
239		241
240	SvUPGRADE (data, SVt_PV);	242	#if !HAVE_PREADWRITE
241	SvPOK_on (data);	243	# define pread aio_pread
		244	# define pwrite aio_pwrite
242		245
243	if (dataoffset < 0)	246	/*
244	dataoffset += svlen;	247	* make our pread/pwrite safe against themselves, but not against
		248	* normal read/write by using a mutex. slows down execution a lot,
		249	* but that's your problem, not mine.
		250	*/
		251	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
245		252
246	if (dataoffset < 0 \|\| dataoffset > svlen)	253	static ssize_t
247	croak ("data offset outside of string");	254	pread (int fd, void *buf, size_t count, off_t offset)
		255	{
		256	ssize_t res;
		257	off_t ooffset;
248		258
249	if (dowrite)	259	pthread_mutex_lock (&iolock);
		260	ooffset = lseek (fd, 0, SEEK_CUR);
		261	lseek (fd, offset, SEEK_SET);
		262	res = read (fd, buf, count);
		263	lseek (fd, ooffset, SEEK_SET);
		264	pthread_mutex_unlock (&iolock);
		265
		266	return res;
		267	}
		268
		269	static ssize_t
		270	pwrite (int fd, void *buf, size_t count, off_t offset)
		271	{
		272	ssize_t res;
		273	off_t ooffset;
		274
		275	pthread_mutex_lock (&iolock);
		276	ooffset = lseek (fd, 0, SEEK_CUR);
		277	lseek (fd, offset, SEEK_SET);
		278	res = write (fd, buf, count);
		279	lseek (fd, offset, SEEK_SET);
		280	pthread_mutex_unlock (&iolock);
		281
		282	return res;
		283	}
		284	#endif
		285
		286	#if !HAVE_FDATASYNC
		287	# define fdatasync fsync
		288	#endif
		289
		290	#if !HAVE_READAHEAD
		291	# define readahead aio_readahead
		292
		293	static char readahead_buf[4096];
		294
		295	static ssize_t
		296	readahead (int fd, off_t offset, size_t count)
		297	{
		298	while (count > 0)
250	{	299	{
251	/* write: check length and adjust. */	300	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
252	if (length < 0 \|\| length + dataoffset > svlen)	301
253	length = svlen - dataoffset;	302	pread (fd, readahead_buf, len, offset);
		303	offset += len;
		304	count -= len;
254	}	305	}
255	else
256	{
257	/* read: grow scalar as necessary */
258	svptr = SvGROW (data, length + dataoffset);
259	}
260		306
261	if (length < 0)	307	errno = 0;
262	croak ("length must not be negative");
263
264	Newz (0, req, 1, aio_cb);
265
266	if (!req)
267	croak ("out of memory during aio_req allocation");
268
269	req->type = dowrite ? REQ_WRITE : REQ_READ;
270	req->fd = fd;
271	req->offset = offset;
272	req->length = length;
273	req->data = SvREFCNT_inc (data);
274	req->dataptr = (char *)svptr + dataoffset;
275	req->callback = SvREFCNT_inc (callback);
276
277	send_req (req);
278	}	308	}
		309	#endif
279		310
280	static void *	311	static void *
281	aio_proc (void *thr_arg)	312	aio_proc (void *thr_arg)
282	{	313	{
283	aio_req req;	314	aio_req req;
…		…
309		340
310	type = req->type;	341	type = req->type;
311		342
312	switch (type)	343	switch (type)
313	{	344	{
314	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	345	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
315	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	346	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
316	#if SYS_readahead	347
317	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	348	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
318	#else
319	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
320	#endif
321		349
322	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	350	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
323	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	351	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
324	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	352	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
325		353
326	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	354	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
327	case REQ_CLOSE: req->result = close (req->fd); break;	355	case REQ_CLOSE: req->result = close (req->fd); break;
328	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	356	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
329		357
		358	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
330	case REQ_FSYNC: req->result = fsync (req->fd); break;	359	case REQ_FSYNC: req->result = fsync (req->fd); break;
331	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
332		360
333	case REQ_QUIT:	361	case REQ_QUIT:
334	break;	362	break;
335		363
336	default:	364	default:
…		…
364	return 0;	392	return 0;
365	}	393	}
366		394
367	MODULE = IO::AIO PACKAGE = IO::AIO	395	MODULE = IO::AIO PACKAGE = IO::AIO
368		396
		397	PROTOTYPES: ENABLE
		398
369	BOOT:	399	BOOT:
370	{	400	{
371	if (pipe (respipe))	401	if (pipe (respipe))
372	croak ("unable to initialize result pipe");	402	croak ("unable to initialize result pipe");
373		403
…		…
400	}	430	}
401		431
402	while (started > nthreads)	432	while (started > nthreads)
403	{	433	{
404	poll_wait ();	434	poll_wait ();
405	poll_cb (aTHX);	435	poll_cb ();
406	}	436	}
407	}	437	}
408		438
409	int	439	int
410	max_outstanding(nreqs)	440	max_outstanding(nreqs)
…		…
413	CODE:	443	CODE:
414	RETVAL = max_outstanding;	444	RETVAL = max_outstanding;
415	max_outstanding = nreqs;	445	max_outstanding = nreqs;
416		446
417	void	447	void
418	aio_open(pathname,flags,mode,callback)	448	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
419	SV * pathname	449	SV * pathname
420	int flags	450	int flags
421	int mode	451	int mode
422	SV * callback	452	SV * callback
423	PROTOTYPE: $$$$	453	PROTOTYPE: $$$;$
424	CODE:	454	CODE:
425	{	455	{
426	aio_req req;	456	aio_req req;
427		457
428	Newz (0, req, 1, aio_cb);	458	Newz (0, req, 1, aio_cb);
…		…
439		469
440	send_req (req);	470	send_req (req);
441	}	471	}
442		472
443	void	473	void
444	aio_close(fh,callback)	474	aio_close(fh,callback=&PL_sv_undef)
445	InputStream fh	475	SV * fh
446	SV * callback	476	SV * callback
447	PROTOTYPE: $$	477	PROTOTYPE: $;$
448	ALIAS:	478	ALIAS:
449	aio_close = REQ_CLOSE	479	aio_close = REQ_CLOSE
450	aio_fsync = REQ_FSYNC	480	aio_fsync = REQ_FSYNC
451	aio_fdatasync = REQ_FDATASYNC	481	aio_fdatasync = REQ_FDATASYNC
452	CODE:	482	CODE:
…		…
457		487
458	if (!req)	488	if (!req)
459	croak ("out of memory during aio_req allocation");	489	croak ("out of memory during aio_req allocation");
460		490
461	req->type = ix;	491	req->type = ix;
		492	req->fh = newSVsv (fh);
462	req->fd = PerlIO_fileno (fh);	493	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
463	req->callback = SvREFCNT_inc (callback);	494	req->callback = SvREFCNT_inc (callback);
464		495
465	send_req (req);	496	send_req (req);
466	}	497	}
467		498
468	void	499	void
469	aio_read(fh,offset,length,data,dataoffset,callback)	500	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
470	InputStream fh	501	SV * fh
471	UV offset	502	UV offset
472	IV length	503	IV length
473	SV * data	504	SV * data
474	IV dataoffset	505	IV dataoffset
475	SV * callback	506	SV * callback
		507	ALIAS:
		508	aio_read = REQ_READ
		509	aio_write = REQ_WRITE
476	PROTOTYPE: $$$$$$	510	PROTOTYPE: $$$$$;$
477	CODE:	511	CODE:
478	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
479
480	void
481	aio_write(fh,offset,length,data,dataoffset,callback)
482	OutputStream fh
483	UV offset
484	IV length
485	SV * data
486	IV dataoffset
487	SV * callback
488	PROTOTYPE: $$$$$$
489	CODE:
490	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
491
492	void
493	aio_readahead(fh,offset,length,callback)
494	InputStream fh
495	UV offset
496	IV length
497	SV * callback
498	PROTOTYPE: $$$$
499	CODE:
500	{	512	{
501	aio_req req;	513	aio_req req;
		514	STRLEN svlen;
		515	char *svptr = SvPV (data, svlen);
		516
		517	SvUPGRADE (data, SVt_PV);
		518	SvPOK_on (data);
		519
		520	if (dataoffset < 0)
		521	dataoffset += svlen;
		522
		523	if (dataoffset < 0 \|\| dataoffset > svlen)
		524	croak ("data offset outside of string");
		525
		526	if (ix == REQ_WRITE)
		527	{
		528	/* write: check length and adjust. */
		529	if (length < 0 \|\| length + dataoffset > svlen)
		530	length = svlen - dataoffset;
		531	}
		532	else
		533	{
		534	/* read: grow scalar as necessary */
		535	svptr = SvGROW (data, length + dataoffset);
		536	}
502		537
503	if (length < 0)	538	if (length < 0)
504	croak ("length must not be negative");	539	croak ("length must not be negative");
505		540
506	Newz (0, req, 1, aio_cb);	541	Newz (0, req, 1, aio_cb);
507		542
508	if (!req)	543	if (!req)
509	croak ("out of memory during aio_req allocation");	544	croak ("out of memory during aio_req allocation");
510		545
		546	req->type = ix;
		547	req->fh = newSVsv (fh);
		548	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		549	: IoOFP (sv_2io (fh)));
		550	req->offset = offset;
		551	req->length = length;
		552	req->data = SvREFCNT_inc (data);
		553	req->dataptr = (char *)svptr + dataoffset;
		554	req->callback = SvREFCNT_inc (callback);
		555
		556	send_req (req);
		557	}
		558
		559	void
		560	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
		561	SV * fh
		562	UV offset
		563	IV length
		564	SV * callback
		565	PROTOTYPE: $$$;$
		566	CODE:
		567	{
		568	aio_req req;
		569
		570	if (length < 0)
		571	croak ("length must not be negative");
		572
		573	Newz (0, req, 1, aio_cb);
		574
		575	if (!req)
		576	croak ("out of memory during aio_req allocation");
		577
511	req->type = REQ_READAHEAD;	578	req->type = REQ_READAHEAD;
		579	req->fh = newSVsv (fh);
512	req->fd = PerlIO_fileno (fh);	580	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
513	req->offset = offset;	581	req->offset = offset;
514	req->length = length;	582	req->length = length;
515	req->callback = SvREFCNT_inc (callback);	583	req->callback = SvREFCNT_inc (callback);
516		584
517	send_req (req);	585	send_req (req);
518	}	586	}
519		587
520	void	588	void
521	aio_stat(fh_or_path,callback)	589	aio_stat(fh_or_path,callback=&PL_sv_undef)
522	SV * fh_or_path	590	SV * fh_or_path
523	SV * callback	591	SV * callback
524	PROTOTYPE: $$
525	ALIAS:	592	ALIAS:
		593	aio_stat = REQ_STAT
526	aio_lstat = 1	594	aio_lstat = REQ_LSTAT
527	CODE:	595	CODE:
528	{	596	{
529	aio_req req;	597	aio_req req;
530		598
531	Newz (0, req, 1, aio_cb);	599	Newz (0, req, 1, aio_cb);
…		…
538	if (!req->statdata)	606	if (!req->statdata)
539	croak ("out of memory during aio_req->statdata allocation");	607	croak ("out of memory during aio_req->statdata allocation");
540		608
541	if (SvPOK (fh_or_path))	609	if (SvPOK (fh_or_path))
542	{	610	{
543	req->type = ix ? REQ_LSTAT : REQ_STAT;	611	req->type = ix;
544	req->data = newSVsv (fh_or_path);	612	req->data = newSVsv (fh_or_path);
545	req->dataptr = SvPV_nolen (req->data);	613	req->dataptr = SvPV_nolen (req->data);
546	}	614	}
547	else	615	else
548	{	616	{
549	req->type = REQ_FSTAT;	617	req->type = REQ_FSTAT;
		618	req->fh = newSVsv (fh_or_path);
550	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	619	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
551	}	620	}
552		621
553	req->callback = SvREFCNT_inc (callback);	622	req->callback = SvREFCNT_inc (callback);
554		623
555	send_req (req);	624	send_req (req);
556	}	625	}
557		626
558	void	627	void
559	aio_unlink(pathname,callback)	628	aio_unlink(pathname,callback=&PL_sv_undef)
560	SV * pathname	629	SV * pathname
561	SV * callback	630	SV * callback
562	PROTOTYPE: $$
563	CODE:	631	CODE:
564	{	632	{
565	aio_req req;	633	aio_req req;
566		634
567	Newz (0, req, 1, aio_cb);	635	Newz (0, req, 1, aio_cb);
…		…
575	req->callback = SvREFCNT_inc (callback);	643	req->callback = SvREFCNT_inc (callback);
576		644
577	send_req (req);	645	send_req (req);
578	}	646	}
579		647
		648	void
		649	flush()
		650	PROTOTYPE:
		651	CODE:
		652	while (nreqs)
		653	{
		654	poll_wait ();
		655	poll_cb ();
		656	}
		657
		658	void
		659	poll()
		660	PROTOTYPE:
		661	CODE:
		662	if (nreqs)
		663	{
		664	poll_wait ();
		665	poll_cb ();
		666	}
		667
580	int	668	int
581	poll_fileno()	669	poll_fileno()
582	PROTOTYPE:	670	PROTOTYPE:
583	CODE:	671	CODE:
584	RETVAL = respipe [0];	672	RETVAL = respipe [0];
…		…
587		675
588	int	676	int
589	poll_cb(...)	677	poll_cb(...)
590	PROTOTYPE:	678	PROTOTYPE:
591	CODE:	679	CODE:
592	RETVAL = poll_cb (aTHX);	680	RETVAL = poll_cb ();
593	OUTPUT:	681	OUTPUT:
594	RETVAL	682	RETVAL
595		683
596	void	684	void
597	poll_wait()	685	poll_wait()

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Comparing IO-AIO/AIO.xs (file contents): Revision 1.4 by root, Sun Jul 10 20:57:00 2005 UTC vs. Revision 1.18 by root, Sun Jul 31 19:00:31 2005 UTC

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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.4 by root, Sun Jul 10 20:57:00 2005 UTC vs.
Revision 1.18 by root, Sun Jul 31 19:00:31 2005 UTC