fileio-posix.cpp@ 22509

Last change on this file since 22509 was 21616, checked in by vboxsync, 15 years ago
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1	/* $Id: fileio-posix.cpp 21616 2009-07-15 15:27:07Z vboxsync $ */
2	/** @file
3	* IPRT - File I/O, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*
26	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31
32	/*******************************************************************************
33	* Header Files *
34	*******************************************************************************/
35	#define LOG_GROUP RTLOGGROUP_FILE
36
37	#include <errno.h>
38	#include <sys/stat.h>
39	#include <sys/types.h>
40	#include <sys/ioctl.h>
41	#include <sys/fcntl.h>
42	#include <fcntl.h>
43	#ifdef _MSC_VER
44	# include <io.h>
45	# include <stdio.h>
46	#else
47	# include <unistd.h>
48	# include <sys/time.h>
49	#endif
50	#if defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006)
51	# include <io.h>
52	#endif
53	#ifdef RT_OS_L4
54	/* This is currently ifdef'ed out in the relevant L4 header file */
55	/* Same as `utimes', but takes an open file descriptor instead of a name. */
56	extern int futimes(int __fd, __const struct timeval __tvp[2]) __THROW;
57	#endif
58
59	#ifdef RT_OS_SOLARIS
60	# define futimes(filedes, timeval) futimesat(filedes, NULL, timeval)
61	#endif
62
63	#include <iprt/file.h>
64	#include <iprt/path.h>
65	#include <iprt/assert.h>
66	#include <iprt/string.h>
67	#include <iprt/err.h>
68	#include <iprt/log.h>
69	#include "internal/file.h"
70	#include "internal/fs.h"
71	#include "internal/path.h"
72
73
74
75	/*******************************************************************************
76	* Defined Constants And Macros *
77	*******************************************************************************/
78	/** @def RT_DONT_CONVERT_FILENAMES
79	* Define this to pass UTF-8 unconverted to the kernel. */
80	#ifdef __DOXYGEN__
81	#define RT_DONT_CONVERT_FILENAMES 1
82	#endif
83
84	/** Default file permissions for newly created files. */
85	#if defined(S_IRUSR) && defined(S_IWUSR)
86	# define RT_FILE_PERMISSION (S_IRUSR \| S_IWUSR)
87	#else
88	# define RT_FILE_PERMISSION (00600)
89	#endif
90
91
92	RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, unsigned fOpen)
93	{
94	/*
95	* Validate input.
96	*/
97	if (!VALID_PTR(pFile))
98	{
99	AssertMsgFailed(("Invalid pFile %p\n", pFile));
100	return VERR_INVALID_PARAMETER;
101	}
102	*pFile = NIL_RTFILE;
103	if (!VALID_PTR(pszFilename))
104	{
105	AssertMsgFailed(("Invalid pszFilename %p\n", pszFilename));
106	return VERR_INVALID_PARAMETER;
107	}
108
109	/*
110	* Merge forced open flags and validate them.
111	*/
112	int rc = rtFileRecalcAndValidateFlags(&fOpen);
113	if (RT_FAILURE(rc))
114	return rc;
115	#ifndef O_NONBLOCK
116	if (fOpen & RTFILE_O_NON_BLOCK)
117	{
118	AssertMsgFailed(("Invalid parameters! fOpen=%#x\n", fOpen));
119	return VERR_INVALID_PARAMETER;
120	}
121	#endif
122
123	/*
124	* Calculate open mode flags.
125	*/
126	int fOpenMode = 0;
127	#ifdef O_BINARY
128	fOpenMode \|= O_BINARY; /* (pc) */
129	#endif
130	#ifdef O_LARGEFILE
131	fOpenMode \|= O_LARGEFILE; /* (linux) */
132	#endif
133	#ifdef O_NOINHERIT
134	if (!(fOpen & RTFILE_O_INHERIT))
135	fOpenMode \|= O_NOINHERIT;
136	#endif
137	#ifdef O_NONBLOCK
138	if (fOpen & RTFILE_O_NON_BLOCK)
139	fOpenMode \|= O_NONBLOCK;
140	#endif
141	#ifdef O_SYNC
142	if (fOpen & RTFILE_O_WRITE_THROUGH)
143	fOpenMode \|= O_SYNC;
144	#endif
145	#if defined(O_DIRECT) && defined(RT_OS_LINUX)
146	/* O_DIRECT is mandatory to get async I/O working on Linux. */
147	if (fOpen & RTFILE_O_ASYNC_IO)
148	fOpenMode \|= O_DIRECT;
149	#endif
150	#if defined(O_DIRECT) && (defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD))
151	/* Disable the kernel cache. */
152	if (fOpen & RTFILE_O_NO_CACHE)
153	fOpenMode \|= O_DIRECT;
154	#endif
155
156	/* create/truncate file */
157	switch (fOpen & RTFILE_O_ACTION_MASK)
158	{
159	case RTFILE_O_OPEN: break;
160	case RTFILE_O_OPEN_CREATE: fOpenMode \|= O_CREAT; break;
161	case RTFILE_O_CREATE: fOpenMode \|= O_CREAT \| O_EXCL; break;
162	case RTFILE_O_CREATE_REPLACE: fOpenMode \|= O_CREAT \| O_TRUNC; break; /** @todo replacing needs fixing, this is not a 1:1 mapping! */
163	}
164	if (fOpen & RTFILE_O_TRUNCATE)
165	fOpenMode \|= O_TRUNC;
166
167	switch (fOpen & RTFILE_O_ACCESS_MASK)
168	{
169	case RTFILE_O_READ:
170	fOpenMode \|= O_RDONLY; /* RTFILE_O_APPEND is ignored. */
171	break;
172	case RTFILE_O_WRITE:
173	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_WRONLY : O_WRONLY;
174	break;
175	case RTFILE_O_READWRITE:
176	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_RDWR : O_RDWR;
177	break;
178	default:
179	AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#x\n", fOpen));
180	return VERR_INVALID_PARAMETER;
181	}
182
183	/* File mode. */
184	int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
185	? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
186	: RT_FILE_PERMISSION;
187
188	/** @todo sharing! */
189
190	/*
191	* Open/create the file.
192	*/
193	#ifdef RT_DONT_CONVERT_FILENAMES
194	int fh = open(pszFilename, fOpenMode, fMode);
195	int iErr = errno;
196	#else
197	char *pszNativeFilename;
198	rc = rtPathToNative(&pszNativeFilename, pszFilename);
199	if (RT_FAILURE(rc))
200	return (rc);
201
202	int fh = open(pszNativeFilename, fOpenMode, fMode);
203	int iErr = errno;
204	rtPathFreeNative(pszNativeFilename);
205	#endif
206	if (fh >= 0)
207	{
208	/*
209	* Mark the file handle close on exec, unless inherit is specified.
210	*/
211	if ( !(fOpen & RTFILE_O_INHERIT)
212	#ifdef O_NOINHERIT
213	\|\| (fOpenMode & O_NOINHERIT) /* careful since it could be a dummy. */
214	#endif
215	\|\| fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0)
216	{
217	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_DARWIN)
218	iErr = 0;
219	/* Switch direct I/O on now if requested */
220	# if defined(RT_OS_SOLARIS) && !defined(IN_GUEST)
221	if (fOpen & RTFILE_O_NO_CACHE)
222	iErr = directio(fh, DIRECTIO_ON);
223	# elif defined(RT_OS_DARWIN)
224	if (fOpen & RTFILE_O_NO_CACHE)
225	iErr = fcntl(fh, F_NOCACHE);
226	# endif
227	if (iErr < 0)
228	iErr = errno;
229	else
230	#endif
231	{
232	*pFile = (RTFILE)fh;
233	Assert((int)*pFile == fh);
234	LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#x): returns %Rrc\n",
235	pFile, *pFile, pszFilename, pszFilename, fOpen, rc));
236	return VINF_SUCCESS;
237	}
238	}
239	iErr = errno;
240	close(fh);
241	}
242	return RTErrConvertFromErrno(iErr);
243	}
244
245
246	RTR3DECL(int) RTFileClose(RTFILE File)
247	{
248	if (close((int)File) == 0)
249	return VINF_SUCCESS;
250	return RTErrConvertFromErrno(errno);
251	}
252
253
254	RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
255	{
256	if ( uNative < 0
257	\|\| (RTFILE)uNative != (RTUINTPTR)uNative)
258	{
259	AssertMsgFailed(("%p\n", uNative));
260	*pFile = NIL_RTFILE;
261	return VERR_INVALID_HANDLE;
262	}
263	*pFile = (RTFILE)uNative;
264	return VINF_SUCCESS;
265	}
266
267
268	RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE File)
269	{
270	AssertReturn(File != NIL_RTFILE, -1);
271	return (RTHCINTPTR)File;
272	}
273
274
275	RTR3DECL(int) RTFileDelete(const char *pszFilename)
276	{
277	char *pszNativeFilename;
278	int rc = rtPathToNative(&pszNativeFilename, pszFilename);
279	if (RT_SUCCESS(rc))
280	{
281	if (unlink(pszNativeFilename) != 0)
282	rc = RTErrConvertFromErrno(errno);
283	rtPathFreeNative(pszNativeFilename);
284	}
285	return rc;
286	}
287
288
289	RTR3DECL(int) RTFileSeek(RTFILE File, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
290	{
291	static const unsigned aSeekRecode[] =
292	{
293	SEEK_SET,
294	SEEK_CUR,
295	SEEK_END,
296	};
297
298	/*
299	* Validate input.
300	*/
301	if (uMethod > RTFILE_SEEK_END)
302	{
303	AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
304	return VERR_INVALID_PARAMETER;
305	}
306
307	/* check that within off_t range. */
308	if ( sizeof(off_t) < sizeof(offSeek)
309	&& ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
310	\|\| (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
311	{
312	AssertMsgFailed(("64-bit search not supported\n"));
313	return VERR_NOT_SUPPORTED;
314	}
315
316	off_t offCurrent = lseek((int)File, (off_t)offSeek, aSeekRecode[uMethod]);
317	if (offCurrent != ~0)
318	{
319	if (poffActual)
320	*poffActual = (uint64_t)offCurrent;
321	return VINF_SUCCESS;
322	}
323	return RTErrConvertFromErrno(errno);
324	}
325
326
327	RTR3DECL(int) RTFileRead(RTFILE File, void pvBuf, size_t cbToRead, size_t pcbRead)
328	{
329	if (cbToRead <= 0)
330	return VINF_SUCCESS;
331
332	/*
333	* Attempt read.
334	*/
335	ssize_t cbRead = read((int)File, pvBuf, cbToRead);
336	if (cbRead >= 0)
337	{
338	if (pcbRead)
339	/* caller can handle partial read. */
340	*pcbRead = cbRead;
341	else
342	{
343	/* Caller expects all to be read. */
344	while ((ssize_t)cbToRead > cbRead)
345	{
346	ssize_t cbReadPart = read((int)File, (char*)pvBuf + cbRead, cbToRead - cbRead);
347	if (cbReadPart <= 0)
348	{
349	if (cbReadPart == 0)
350	return VERR_EOF;
351	return RTErrConvertFromErrno(errno);
352	}
353	cbRead += cbReadPart;
354	}
355	}
356	return VINF_SUCCESS;
357	}
358
359	return RTErrConvertFromErrno(errno);
360	}
361
362
363	RTR3DECL(int) RTFileWrite(RTFILE File, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
364	{
365	if (cbToWrite <= 0)
366	return VINF_SUCCESS;
367
368	/*
369	* Attempt write.
370	*/
371	ssize_t cbWritten = write((int)File, pvBuf, cbToWrite);
372	if (cbWritten >= 0)
373	{
374	if (pcbWritten)
375	/* caller can handle partial write. */
376	*pcbWritten = cbWritten;
377	else
378	{
379	/* Caller expects all to be write. */
380	while ((ssize_t)cbToWrite > cbWritten)
381	{
382	ssize_t cbWrittenPart = write((int)File, (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
383	if (cbWrittenPart <= 0)
384	return RTErrConvertFromErrno(errno);
385	cbWritten += cbWrittenPart;
386	}
387	}
388	return VINF_SUCCESS;
389	}
390	return RTErrConvertFromErrno(errno);
391	}
392
393
394	RTR3DECL(int) RTFileSetSize(RTFILE File, uint64_t cbSize)
395	{
396	/*
397	* Validate offset.
398	*/
399	if ( sizeof(off_t) < sizeof(cbSize)
400	&& (cbSize >> 32) != 0)
401	{
402	AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
403	return VERR_NOT_SUPPORTED;
404	}
405
406	#if defined(_MSC_VER) \|\| (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006))
407	if (chsize((int)File, (off_t)cbSize) == 0)
408	#else
409	/* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
410	* LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
411	* than the file.)
412	*/
413	if (ftruncate((int)File, (off_t)cbSize) == 0)
414	#endif
415	return VINF_SUCCESS;
416	return RTErrConvertFromErrno(errno);
417	}
418
419
420	RTR3DECL(int) RTFileGetSize(RTFILE File, uint64_t *pcbSize)
421	{
422	struct stat st;
423	if (!fstat((int)File, &st))
424	{
425	*pcbSize = st.st_size;
426	return VINF_SUCCESS;
427	}
428	return RTErrConvertFromErrno(errno);
429	}
430
431
432	/**
433	* Determine the maximum file size.
434	*
435	* @returns IPRT status code.
436	* @param File Handle to the file.
437	* @param pcbMax Where to store the max file size.
438	* @see RTFileGetMaxSize.
439	*/
440	RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
441	{
442	/*
443	* Save the current location
444	*/
445	uint64_t offOld;
446	int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &offOld);
447	if (RT_FAILURE(rc))
448	return rc;
449
450	/*
451	* Perform a binary search for the max file size.
452	*/
453	uint64_t offLow = 0;
454	uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
455	/** @todo Unfortunately this does not work for certain file system types,
456	* for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
457	* file systems. */
458	//uint64_t offHigh = INT64_MAX;
459	for (;;)
460	{
461	uint64_t cbInterval = (offHigh - offLow) >> 1;
462	if (cbInterval == 0)
463	{
464	if (pcbMax)
465	*pcbMax = offLow;
466	return RTFileSeek(File, offOld, RTFILE_SEEK_BEGIN, NULL);
467	}
468
469	rc = RTFileSeek(File, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
470	if (RT_FAILURE(rc))
471	offHigh = offLow + cbInterval;
472	else
473	offLow = offLow + cbInterval;
474	}
475	}
476
477
478	RTR3DECL(bool) RTFileIsValid(RTFILE File)
479	{
480	if (File != NIL_RTFILE)
481	{
482	int fFlags = fcntl(File, F_GETFD);
483	if (fFlags >= 0)
484	return true;
485	}
486	return false;
487	}
488
489
490	RTR3DECL(int) RTFileFlush(RTFILE File)
491	{
492	if (fsync((int)File))
493	return RTErrConvertFromErrno(errno);
494	return VINF_SUCCESS;
495	}
496
497
498	RTR3DECL(int) RTFileIoCtl(RTFILE File, int iRequest, void pvData, unsigned cbData, int piRet)
499	{
500	int rc = ioctl((int)File, iRequest, pvData);
501	if (piRet)
502	*piRet = rc;
503	return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
504	}
505
506
507	RTR3DECL(int) RTFileQueryInfo(RTFILE File, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
508	{
509	/*
510	* Validate input.
511	*/
512	if (File == NIL_RTFILE)
513	{
514	AssertMsgFailed(("Invalid File=%RTfile\n", File));
515	return VERR_INVALID_PARAMETER;
516	}
517	if (!pObjInfo)
518	{
519	AssertMsgFailed(("Invalid pObjInfo=%p\n", pObjInfo));
520	return VERR_INVALID_PARAMETER;
521	}
522	if ( enmAdditionalAttribs < RTFSOBJATTRADD_NOTHING
523	\|\| enmAdditionalAttribs > RTFSOBJATTRADD_LAST)
524	{
525	AssertMsgFailed(("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs));
526	return VERR_INVALID_PARAMETER;
527	}
528
529	/*
530	* Query file info.
531	*/
532	struct stat Stat;
533	if (fstat((int)File, &Stat))
534	{
535	int rc = RTErrConvertFromErrno(errno);
536	Log(("RTFileQueryInfo(%RTfile,,%d): returns %Rrc\n", File, enmAdditionalAttribs, rc));
537	return rc;
538	}
539
540	/*
541	* Setup the returned data.
542	*/
543	rtFsConvertStatToObjInfo(pObjInfo, &Stat, NULL, 0);
544
545	/*
546	* Requested attributes (we cannot provide anything actually).
547	*/
548	switch (enmAdditionalAttribs)
549	{
550	case RTFSOBJATTRADD_EASIZE:
551	pObjInfo->Attr.enmAdditional = RTFSOBJATTRADD_EASIZE;
552	pObjInfo->Attr.u.EASize.cb = 0;
553	break;
554
555	case RTFSOBJATTRADD_NOTHING:
556	case RTFSOBJATTRADD_UNIX:
557	/* done */
558	break;
559
560	default:
561	AssertMsgFailed(("Impossible!\n"));
562	return VERR_INTERNAL_ERROR;
563	}
564
565	LogFlow(("RTFileQueryInfo(%RTfile,,%d): returns VINF_SUCCESS\n", File, enmAdditionalAttribs));
566	return VINF_SUCCESS;
567	}
568
569
570	RTR3DECL(int) RTFileSetTimes(RTFILE File, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
571	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
572	{
573	/*
574	* We can only set AccessTime and ModificationTime, so if neither
575	* are specified we can return immediately.
576	*/
577	if (!pAccessTime && !pModificationTime)
578	return VINF_SUCCESS;
579
580	/*
581	* Convert the input to timeval, getting the missing one if necessary,
582	* and call the API which does the change.
583	*/
584	struct timeval aTimevals[2];
585	if (pAccessTime && pModificationTime)
586	{
587	RTTimeSpecGetTimeval(pAccessTime, &aTimevals[0]);
588	RTTimeSpecGetTimeval(pModificationTime, &aTimevals[1]);
589	}
590	else
591	{
592	RTFSOBJINFO ObjInfo;
593	int rc = RTFileQueryInfo(File, &ObjInfo, RTFSOBJATTRADD_UNIX);
594	if (RT_FAILURE(rc))
595	return rc;
596	RTTimeSpecGetTimeval(pAccessTime ? pAccessTime : &ObjInfo.AccessTime, &aTimevals[0]);
597	RTTimeSpecGetTimeval(pModificationTime ? pModificationTime : &ObjInfo.ModificationTime, &aTimevals[1]);
598	}
599
600	if (futimes((int)File, aTimevals))
601	{
602	int rc = RTErrConvertFromErrno(errno);
603	Log(("RTFileSetTimes(%RTfile,%p,%p,,): returns %Rrc\n", File, pAccessTime, pModificationTime, rc));
604	return rc;
605	}
606	return VINF_SUCCESS;
607	}
608
609
610	RTR3DECL(int) RTFileSetMode(RTFILE File, RTFMODE fMode)
611	{
612	/*
613	* Normalize the mode and call the API.
614	*/
615	fMode = rtFsModeNormalize(fMode, NULL, 0);
616	if (!rtFsModeIsValid(fMode))
617	return VERR_INVALID_PARAMETER;
618
619	if (fchmod((int)File, fMode & RTFS_UNIX_MASK))
620	{
621	int rc = RTErrConvertFromErrno(errno);
622	Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", File, fMode, rc));
623	return rc;
624	}
625	return VINF_SUCCESS;
626	}
627
628
629	RTR3DECL(int) RTFileRename(const char pszSrc, const char pszDst, unsigned fRename)
630	{
631	/*
632	* Validate input.
633	*/
634	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
635	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
636	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
637	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
638	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
639
640	/*
641	* Take common cause with RTPathRename.
642	*/
643	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
644
645	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
646	pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
647	return rc;
648	}
649
650

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source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp@ 22509

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