fileio-posix.cpp@ 40517

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1	/* $Id: fileio-posix.cpp 39627 2011-12-15 11:44:19Z vboxsync $ */
2	/** @file
3	* IPRT - File I/O, POSIX, Part 1.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Oracle Corporation
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
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#define LOG_GROUP RTLOGGROUP_FILE
32
33	#include <errno.h>
34	#include <sys/stat.h>
35	#include <sys/types.h>
36	#include <sys/ioctl.h>
37	#include <sys/fcntl.h>
38	#include <fcntl.h>
39	#ifdef _MSC_VER
40	# include <io.h>
41	# include <stdio.h>
42	#else
43	# include <unistd.h>
44	# include <sys/time.h>
45	#endif
46	#ifdef RT_OS_LINUX
47	# include <sys/file.h>
48	#endif
49	#if defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006)
50	# include <io.h>
51	#endif
52	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
53	# include <sys/disk.h>
54	#endif
55	#ifdef RT_OS_SOLARIS
56	# include <stropts.h>
57	# include <sys/dkio.h>
58	# include <sys/vtoc.h>
59	#endif /* RT_OS_SOLARIS */
60
61	#include <iprt/file.h>
62	#include <iprt/path.h>
63	#include <iprt/assert.h>
64	#include <iprt/string.h>
65	#include <iprt/err.h>
66	#include <iprt/log.h>
67	#include "internal/file.h"
68	#include "internal/fs.h"
69	#include "internal/path.h"
70
71
72
73	/*******************************************************************************
74	* Defined Constants And Macros *
75	*******************************************************************************/
76	/** Default file permissions for newly created files. */
77	#if defined(S_IRUSR) && defined(S_IWUSR)
78	# define RT_FILE_PERMISSION (S_IRUSR \| S_IWUSR)
79	#else
80	# define RT_FILE_PERMISSION (00600)
81	#endif
82
83
84	RTDECL(bool) RTFileExists(const char *pszPath)
85	{
86	bool fRc = false;
87	char const *pszNativePath;
88	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
89	if (RT_SUCCESS(rc))
90	{
91	struct stat s;
92	fRc = !stat(pszNativePath, &s)
93	&& S_ISREG(s.st_mode);
94
95	rtPathFreeNative(pszNativePath, pszPath);
96	}
97
98	LogFlow(("RTFileExists(%p={%s}): returns %RTbool\n", pszPath, pszPath, fRc));
99	return fRc;
100	}
101
102
103	RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
104	{
105	/*
106	* Validate input.
107	*/
108	AssertPtrReturn(pFile, VERR_INVALID_POINTER);
109	*pFile = NIL_RTFILE;
110	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
111
112	/*
113	* Merge forced open flags and validate them.
114	*/
115	int rc = rtFileRecalcAndValidateFlags(&fOpen);
116	if (RT_FAILURE(rc))
117	return rc;
118	#ifndef O_NONBLOCK
119	if (fOpen & RTFILE_O_NON_BLOCK)
120	{
121	AssertMsgFailed(("Invalid parameters! fOpen=%#llx\n", fOpen));
122	return VERR_INVALID_PARAMETER;
123	}
124	#endif
125
126	/*
127	* Calculate open mode flags.
128	*/
129	int fOpenMode = 0;
130	#ifdef O_BINARY
131	fOpenMode \|= O_BINARY; /* (pc) */
132	#endif
133	#ifdef O_LARGEFILE
134	fOpenMode \|= O_LARGEFILE; /* (linux, solaris) */
135	#endif
136	#ifdef O_NOINHERIT
137	if (!(fOpen & RTFILE_O_INHERIT))
138	fOpenMode \|= O_NOINHERIT;
139	#endif
140	#ifdef O_CLOEXEC
141	static int s_fHave_O_CLOEXEC = 0; /* {-1,0,1}; since Linux 2.6.23 */
142	if (!(fOpen & RTFILE_O_INHERIT) && s_fHave_O_CLOEXEC >= 0)
143	fOpenMode \|= O_CLOEXEC;
144	#endif
145	#ifdef O_NONBLOCK
146	if (fOpen & RTFILE_O_NON_BLOCK)
147	fOpenMode \|= O_NONBLOCK;
148	#endif
149	#ifdef O_SYNC
150	if (fOpen & RTFILE_O_WRITE_THROUGH)
151	fOpenMode \|= O_SYNC;
152	#endif
153	#if defined(O_DIRECT) && defined(RT_OS_LINUX)
154	/* O_DIRECT is mandatory to get async I/O working on Linux. */
155	if (fOpen & RTFILE_O_ASYNC_IO)
156	fOpenMode \|= O_DIRECT;
157	#endif
158	#if defined(O_DIRECT) && (defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD))
159	/* Disable the kernel cache. */
160	if (fOpen & RTFILE_O_NO_CACHE)
161	fOpenMode \|= O_DIRECT;
162	#endif
163
164	/* create/truncate file */
165	switch (fOpen & RTFILE_O_ACTION_MASK)
166	{
167	case RTFILE_O_OPEN: break;
168	case RTFILE_O_OPEN_CREATE: fOpenMode \|= O_CREAT; break;
169	case RTFILE_O_CREATE: fOpenMode \|= O_CREAT \| O_EXCL; break;
170	case RTFILE_O_CREATE_REPLACE: fOpenMode \|= O_CREAT \| O_TRUNC; break; /** @todo replacing needs fixing, this is not a 1:1 mapping! */
171	}
172	if (fOpen & RTFILE_O_TRUNCATE)
173	fOpenMode \|= O_TRUNC;
174
175	switch (fOpen & RTFILE_O_ACCESS_MASK)
176	{
177	case RTFILE_O_READ:
178	fOpenMode \|= O_RDONLY; /* RTFILE_O_APPEND is ignored. */
179	break;
180	case RTFILE_O_WRITE:
181	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_WRONLY : O_WRONLY;
182	break;
183	case RTFILE_O_READWRITE:
184	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_RDWR : O_RDWR;
185	break;
186	default:
187	AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#llx\n", fOpen));
188	return VERR_INVALID_PARAMETER;
189	}
190
191	/* File mode. */
192	int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
193	? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
194	: RT_FILE_PERMISSION;
195
196	/** @todo sharing! */
197
198	/*
199	* Open/create the file.
200	*/
201	char const *pszNativeFilename;
202	rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
203	if (RT_FAILURE(rc))
204	return (rc);
205
206	int fh = open(pszNativeFilename, fOpenMode, fMode);
207	int iErr = errno;
208
209	#ifdef O_CLOEXEC
210	if ( (fOpenMode & O_CLOEXEC)
211	&& s_fHave_O_CLOEXEC == 0)
212	{
213	if (fh < 0 && iErr == EINVAL)
214	{
215	s_fHave_O_CLOEXEC = -1;
216	fh = open(pszNativeFilename, fOpenMode, fMode);
217	iErr = errno;
218	}
219	else if (fh >= 0)
220	s_fHave_O_CLOEXEC = fcntl(fh, F_GETFD, 0) > 0 ? 1 : -1;
221	}
222	#endif
223
224	rtPathFreeNative(pszNativeFilename, pszFilename);
225	if (fh >= 0)
226	{
227	iErr = 0;
228
229	/*
230	* Mark the file handle close on exec, unless inherit is specified.
231	*/
232	if ( !(fOpen & RTFILE_O_INHERIT)
233	#ifdef O_NOINHERIT
234	&& !(fOpenMode & O_NOINHERIT) /* Take care since it might be a zero value dummy. */
235	#endif
236	#ifdef O_CLOEXEC
237	&& s_fHave_O_CLOEXEC <= 0
238	#endif
239	)
240	iErr = fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0 ? 0 : errno;
241
242	/*
243	* Switch direct I/O on now if requested and required.
244	*/
245	#if defined(RT_OS_DARWIN) \
246	\|\| (defined(RT_OS_SOLARIS) && !defined(IN_GUEST))
247	if (iErr == 0 && (fOpen & RTFILE_O_NO_CACHE))
248	{
249	# if defined(RT_OS_DARWIN)
250	iErr = fcntl(fh, F_NOCACHE, 1) >= 0 ? 0 : errno;
251	# else
252	iErr = directio(fh, DIRECTIO_ON) >= 0 ? 0 : errno;
253	# endif
254	}
255	#endif
256
257	/*
258	* Implement / emulate file sharing.
259	*
260	* We need another mode which allows skipping this stuff completely
261	* and do things the UNIX way. So for the present this is just a debug
262	* aid that can be enabled by developers too lazy to test on Windows.
263	*/
264	#if 0 && defined(RT_OS_LINUX)
265	if (iErr == 0)
266	{
267	/* This approach doesn't work because only knfsd checks for these
268	buggers. :-( */
269	int iLockOp;
270	switch (fOpen & RTFILE_O_DENY_MASK)
271	{
272	default:
273	AssertFailed();
274	case RTFILE_O_DENY_NONE:
275	case RTFILE_O_DENY_NOT_DELETE:
276	iLockOp = LOCK_MAND \| LOCK_READ \| LOCK_WRITE;
277	break;
278	case RTFILE_O_DENY_READ:
279	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
280	iLockOp = LOCK_MAND \| LOCK_WRITE;
281	break;
282	case RTFILE_O_DENY_WRITE:
283	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
284	iLockOp = LOCK_MAND \| LOCK_READ;
285	break;
286	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
287	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
288	iLockOp = LOCK_MAND;
289	break;
290	}
291	iErr = flock(fh, iLockOp \| LOCK_NB);
292	if (iErr != 0)
293	iErr = errno == EAGAIN ? ETXTBSY : 0;
294	}
295	#endif /* 0 && RT_OS_LINUX */
296	#if defined(DEBUG_bird) && !defined(RT_OS_SOLARIS)
297	if (iErr == 0)
298	{
299	/* This emulation is incomplete but useful. */
300	switch (fOpen & RTFILE_O_DENY_MASK)
301	{
302	default:
303	AssertFailed();
304	case RTFILE_O_DENY_NONE:
305	case RTFILE_O_DENY_NOT_DELETE:
306	case RTFILE_O_DENY_READ:
307	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
308	break;
309	case RTFILE_O_DENY_WRITE:
310	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
311	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
312	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
313	if (fOpen & RTFILE_O_WRITE)
314	{
315	iErr = flock(fh, LOCK_EX \| LOCK_NB);
316	if (iErr != 0)
317	iErr = errno == EAGAIN ? ETXTBSY : 0;
318	}
319	break;
320	}
321	}
322	#endif
323	#ifdef RT_OS_SOLARIS
324	/** @todo Use fshare_t and associates, it's a perfect match. see sys/fcntl.h */
325	#endif
326
327	/*
328	* We're done.
329	*/
330	if (iErr == 0)
331	{
332	*pFile = (RTFILE)(uintptr_t)fh;
333	Assert((intptr_t)*pFile == fh);
334	LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#llx): returns %Rrc\n",
335	pFile, *pFile, pszFilename, pszFilename, fOpen, rc));
336	return VINF_SUCCESS;
337	}
338
339	close(fh);
340	}
341	return RTErrConvertFromErrno(iErr);
342	}
343
344
345	RTR3DECL(int) RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
346	{
347	AssertReturn( fAccess == RTFILE_O_READ
348	\|\| fAccess == RTFILE_O_WRITE
349	\|\| fAccess == RTFILE_O_READWRITE,
350	VERR_INVALID_PARAMETER);
351	return RTFileOpen(phFile, "/dev/null", fAccess \| RTFILE_O_DENY_NONE \| RTFILE_O_OPEN);
352	}
353
354
355	RTR3DECL(int) RTFileClose(RTFILE hFile)
356	{
357	if (hFile == NIL_RTFILE)
358	return VINF_SUCCESS;
359	if (close(RTFileToNative(hFile)) == 0)
360	return VINF_SUCCESS;
361	return RTErrConvertFromErrno(errno);
362	}
363
364
365	RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
366	{
367	AssertCompile(sizeof(uNative) == sizeof(*pFile));
368	if (uNative < 0)
369	{
370	AssertMsgFailed(("%p\n", uNative));
371	*pFile = NIL_RTFILE;
372	return VERR_INVALID_HANDLE;
373	}
374	*pFile = (RTFILE)uNative;
375	return VINF_SUCCESS;
376	}
377
378
379	RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
380	{
381	AssertReturn(hFile != NIL_RTFILE, -1);
382	return (intptr_t)hFile;
383	}
384
385
386	RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
387	{
388	int fd;
389	switch (enmStdHandle)
390	{
391	case RTHANDLESTD_INPUT: fd = 0; break;
392	case RTHANDLESTD_OUTPUT: fd = 1; break;
393	case RTHANDLESTD_ERROR: fd = 2; break;
394	break;
395	default:
396	AssertFailedReturn(NIL_RTFILE);
397	}
398
399	struct stat st;
400	int rc = fstat(fd, &st);
401	if (rc == -1)
402	return NIL_RTFILE;
403	return (RTFILE)(intptr_t)fd;
404	}
405
406
407	RTR3DECL(int) RTFileDelete(const char *pszFilename)
408	{
409	char const *pszNativeFilename;
410	int rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
411	if (RT_SUCCESS(rc))
412	{
413	if (unlink(pszNativeFilename) != 0)
414	rc = RTErrConvertFromErrno(errno);
415	rtPathFreeNative(pszNativeFilename, pszFilename);
416	}
417	return rc;
418	}
419
420
421	RTR3DECL(int) RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
422	{
423	static const unsigned aSeekRecode[] =
424	{
425	SEEK_SET,
426	SEEK_CUR,
427	SEEK_END,
428	};
429
430	/*
431	* Validate input.
432	*/
433	if (uMethod > RTFILE_SEEK_END)
434	{
435	AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
436	return VERR_INVALID_PARAMETER;
437	}
438
439	/* check that within off_t range. */
440	if ( sizeof(off_t) < sizeof(offSeek)
441	&& ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
442	\|\| (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
443	{
444	AssertMsgFailed(("64-bit search not supported\n"));
445	return VERR_NOT_SUPPORTED;
446	}
447
448	off_t offCurrent = lseek(RTFileToNative(hFile), (off_t)offSeek, aSeekRecode[uMethod]);
449	if (offCurrent != ~0)
450	{
451	if (poffActual)
452	*poffActual = (uint64_t)offCurrent;
453	return VINF_SUCCESS;
454	}
455	return RTErrConvertFromErrno(errno);
456	}
457
458
459	RTR3DECL(int) RTFileRead(RTFILE hFile, void pvBuf, size_t cbToRead, size_t pcbRead)
460	{
461	if (cbToRead <= 0)
462	return VINF_SUCCESS;
463
464	/*
465	* Attempt read.
466	*/
467	ssize_t cbRead = read(RTFileToNative(hFile), pvBuf, cbToRead);
468	if (cbRead >= 0)
469	{
470	if (pcbRead)
471	/* caller can handle partial read. */
472	*pcbRead = cbRead;
473	else
474	{
475	/* Caller expects all to be read. */
476	while ((ssize_t)cbToRead > cbRead)
477	{
478	ssize_t cbReadPart = read(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead);
479	if (cbReadPart <= 0)
480	{
481	if (cbReadPart == 0)
482	return VERR_EOF;
483	return RTErrConvertFromErrno(errno);
484	}
485	cbRead += cbReadPart;
486	}
487	}
488	return VINF_SUCCESS;
489	}
490
491	return RTErrConvertFromErrno(errno);
492	}
493
494
495	RTR3DECL(int) RTFileWrite(RTFILE hFile, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
496	{
497	if (cbToWrite <= 0)
498	return VINF_SUCCESS;
499
500	/*
501	* Attempt write.
502	*/
503	ssize_t cbWritten = write(RTFileToNative(hFile), pvBuf, cbToWrite);
504	if (cbWritten >= 0)
505	{
506	if (pcbWritten)
507	/* caller can handle partial write. */
508	*pcbWritten = cbWritten;
509	else
510	{
511	/* Caller expects all to be write. */
512	while ((ssize_t)cbToWrite > cbWritten)
513	{
514	ssize_t cbWrittenPart = write(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
515	if (cbWrittenPart <= 0)
516	return RTErrConvertFromErrno(errno);
517	cbWritten += cbWrittenPart;
518	}
519	}
520	return VINF_SUCCESS;
521	}
522	return RTErrConvertFromErrno(errno);
523	}
524
525
526	RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
527	{
528	/*
529	* Validate offset.
530	*/
531	if ( sizeof(off_t) < sizeof(cbSize)
532	&& (cbSize >> 32) != 0)
533	{
534	AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
535	return VERR_NOT_SUPPORTED;
536	}
537
538	#if defined(_MSC_VER) \|\| (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006))
539	if (chsize(RTFileToNative(hFile), (off_t)cbSize) == 0)
540	#else
541	/* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
542	* LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
543	* than the file.)
544	*/
545	if (ftruncate(RTFileToNative(hFile), (off_t)cbSize) == 0)
546	#endif
547	return VINF_SUCCESS;
548	return RTErrConvertFromErrno(errno);
549	}
550
551
552	RTR3DECL(int) RTFileGetSize(RTFILE hFile, uint64_t *pcbSize)
553	{
554	/*
555	* Ask fstat() first.
556	*/
557	struct stat st;
558	if (!fstat(RTFileToNative(hFile), &st))
559	{
560	*pcbSize = st.st_size;
561	if ( st.st_size != 0
562	#if defined(RT_OS_SOLARIS)
563	\|\| (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
564	#elif defined(RT_OS_FREEBSD)
565	\|\| !S_ISCHR(st.st_mode)
566	#else
567	\|\| !S_ISBLK(st.st_mode)
568	#endif
569	)
570	return VINF_SUCCESS;
571
572	/*
573	* It could be a block device. Try determin the size by I/O control
574	* query or seek.
575	*/
576	#ifdef RT_OS_DARWIN
577	uint64_t cBlocks;
578	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKCOUNT, &cBlocks))
579	{
580	uint32_t cbBlock;
581	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKSIZE, &cbBlock))
582	{
583	pcbSize = cBlocks cbBlock;
584	return VINF_SUCCESS;
585	}
586	}
587	/* must be a block device, fail on failure. */
588
589	#elif defined(RT_OS_SOLARIS)
590	struct dk_minfo MediaInfo;
591	if (!ioctl(RTFileToNative(hFile), DKIOCGMEDIAINFO, &MediaInfo))
592	{
593	pcbSize = MediaInfo.dki_capacity MediaInfo.dki_lbsize;
594	return VINF_SUCCESS;
595	}
596	/* might not be a block device. */
597	if (errno == EINVAL \|\| errno == ENOTTY)
598	return VINF_SUCCESS;
599
600	#elif defined(RT_OS_FREEBSD)
601	off_t cbMedia = 0;
602	if (!ioctl(RTFileToNative(hFile), DIOCGMEDIASIZE, &cbMedia))
603	{
604	*pcbSize = cbMedia;
605	return VINF_SUCCESS;
606	}
607	/* might not be a block device. */
608	if (errno == EINVAL \|\| errno == ENOTTY)
609	return VINF_SUCCESS;
610
611	#else
612	/* PORTME! Avoid this path when possible. */
613	uint64_t offSaved;
614	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offSaved);
615	if (RT_SUCCESS(rc))
616	{
617	rc = RTFileSeek(hFile, 0, RTFILE_SEEK_END, pcbSize);
618	int rc2 = RTFileSeek(hFile, offSaved, RTFILE_SEEK_BEGIN, NULL);
619	if (RT_SUCCESS(rc))
620	return rc2;
621	}
622	#endif
623	}
624	return RTErrConvertFromErrno(errno);
625	}
626
627
628	RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
629	{
630	/*
631	* Save the current location
632	*/
633	uint64_t offOld;
634	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offOld);
635	if (RT_FAILURE(rc))
636	return rc;
637
638	/*
639	* Perform a binary search for the max file size.
640	*/
641	uint64_t offLow = 0;
642	uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
643	/** @todo Unfortunately this does not work for certain file system types,
644	* for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
645	* file systems. */
646	//uint64_t offHigh = INT64_MAX;
647	for (;;)
648	{
649	uint64_t cbInterval = (offHigh - offLow) >> 1;
650	if (cbInterval == 0)
651	{
652	if (pcbMax)
653	*pcbMax = offLow;
654	return RTFileSeek(hFile, offOld, RTFILE_SEEK_BEGIN, NULL);
655	}
656
657	rc = RTFileSeek(hFile, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
658	if (RT_FAILURE(rc))
659	offHigh = offLow + cbInterval;
660	else
661	offLow = offLow + cbInterval;
662	}
663	}
664
665
666	RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
667	{
668	if (hFile != NIL_RTFILE)
669	{
670	int fFlags = fcntl(RTFileToNative(hFile), F_GETFD);
671	if (fFlags >= 0)
672	return true;
673	}
674	return false;
675	}
676
677
678	RTR3DECL(int) RTFileFlush(RTFILE hFile)
679	{
680	if (fsync(RTFileToNative(hFile)))
681	return RTErrConvertFromErrno(errno);
682	return VINF_SUCCESS;
683	}
684
685
686	RTR3DECL(int) RTFileIoCtl(RTFILE hFile, unsigned long ulRequest, void pvData, unsigned cbData, int piRet)
687	{
688	NOREF(cbData);
689	int rc = ioctl(RTFileToNative(hFile), ulRequest, pvData);
690	if (piRet)
691	*piRet = rc;
692	return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
693	}
694
695
696	RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
697	{
698	/*
699	* Normalize the mode and call the API.
700	*/
701	fMode = rtFsModeNormalize(fMode, NULL, 0);
702	if (!rtFsModeIsValid(fMode))
703	return VERR_INVALID_PARAMETER;
704
705	if (fchmod(RTFileToNative(hFile), fMode & RTFS_UNIX_MASK))
706	{
707	int rc = RTErrConvertFromErrno(errno);
708	Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", hFile, fMode, rc));
709	return rc;
710	}
711	return VINF_SUCCESS;
712	}
713
714
715	RTR3DECL(int) RTFileRename(const char pszSrc, const char pszDst, unsigned fRename)
716	{
717	/*
718	* Validate input.
719	*/
720	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
721	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
722	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
723	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
724	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
725
726	/*
727	* Take common cause with RTPathRename.
728	*/
729	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
730
731	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
732	pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
733	return rc;
734	}
735

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source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp@ 40517

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