fileio-posix.cpp@ 43363

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1	/* $Id: fileio-posix.cpp 43363 2012-09-20 09:56:07Z vboxsync $ */
2	/** @file
3	* IPRT - File I/O, POSIX, Part 1.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 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 <fcntl.h>
38	#ifdef _MSC_VER
39	# include <io.h>
40	# include <stdio.h>
41	#else
42	# include <unistd.h>
43	# include <sys/time.h>
44	#endif
45	#ifdef RT_OS_LINUX
46	# include <sys/file.h>
47	#endif
48	#if defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006)
49	# include <io.h>
50	#endif
51	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
52	# include <sys/disk.h>
53	#endif
54	#ifdef RT_OS_SOLARIS
55	# include <stropts.h>
56	# include <sys/dkio.h>
57	# include <sys/vtoc.h>
58	#endif /* RT_OS_SOLARIS */
59
60	#include <iprt/file.h>
61	#include <iprt/path.h>
62	#include <iprt/assert.h>
63	#include <iprt/string.h>
64	#include <iprt/err.h>
65	#include <iprt/log.h>
66	#include "internal/file.h"
67	#include "internal/fs.h"
68	#include "internal/path.h"
69
70
71
72	/*******************************************************************************
73	* Defined Constants And Macros *
74	*******************************************************************************/
75	/** Default file permissions for newly created files. */
76	#if defined(S_IRUSR) && defined(S_IWUSR)
77	# define RT_FILE_PERMISSION (S_IRUSR \| S_IWUSR)
78	#else
79	# define RT_FILE_PERMISSION (00600)
80	#endif
81
82
83	RTDECL(bool) RTFileExists(const char *pszPath)
84	{
85	bool fRc = false;
86	char const *pszNativePath;
87	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
88	if (RT_SUCCESS(rc))
89	{
90	struct stat s;
91	fRc = !stat(pszNativePath, &s)
92	&& S_ISREG(s.st_mode);
93
94	rtPathFreeNative(pszNativePath, pszPath);
95	}
96
97	LogFlow(("RTFileExists(%p={%s}): returns %RTbool\n", pszPath, pszPath, fRc));
98	return fRc;
99	}
100
101
102	RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
103	{
104	/*
105	* Validate input.
106	*/
107	AssertPtrReturn(pFile, VERR_INVALID_POINTER);
108	*pFile = NIL_RTFILE;
109	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
110
111	/*
112	* Merge forced open flags and validate them.
113	*/
114	int rc = rtFileRecalcAndValidateFlags(&fOpen);
115	if (RT_FAILURE(rc))
116	return rc;
117	#ifndef O_NONBLOCK
118	if (fOpen & RTFILE_O_NON_BLOCK)
119	{
120	AssertMsgFailed(("Invalid parameters! fOpen=%#llx\n", fOpen));
121	return VERR_INVALID_PARAMETER;
122	}
123	#endif
124
125	/*
126	* Calculate open mode flags.
127	*/
128	int fOpenMode = 0;
129	#ifdef O_BINARY
130	fOpenMode \|= O_BINARY; /* (pc) */
131	#endif
132	#ifdef O_LARGEFILE
133	fOpenMode \|= O_LARGEFILE; /* (linux, solaris) */
134	#endif
135	#ifdef O_NOINHERIT
136	if (!(fOpen & RTFILE_O_INHERIT))
137	fOpenMode \|= O_NOINHERIT;
138	#endif
139	#ifdef O_CLOEXEC
140	static int s_fHave_O_CLOEXEC = 0; /* {-1,0,1}; since Linux 2.6.23 */
141	if (!(fOpen & RTFILE_O_INHERIT) && s_fHave_O_CLOEXEC >= 0)
142	fOpenMode \|= O_CLOEXEC;
143	#endif
144	#ifdef O_NONBLOCK
145	if (fOpen & RTFILE_O_NON_BLOCK)
146	fOpenMode \|= O_NONBLOCK;
147	#endif
148	#ifdef O_SYNC
149	if (fOpen & RTFILE_O_WRITE_THROUGH)
150	fOpenMode \|= O_SYNC;
151	#endif
152	#if defined(O_DIRECT) && defined(RT_OS_LINUX)
153	/* O_DIRECT is mandatory to get async I/O working on Linux. */
154	if (fOpen & RTFILE_O_ASYNC_IO)
155	fOpenMode \|= O_DIRECT;
156	#endif
157	#if defined(O_DIRECT) && (defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD))
158	/* Disable the kernel cache. */
159	if (fOpen & RTFILE_O_NO_CACHE)
160	fOpenMode \|= O_DIRECT;
161	#endif
162
163	/* create/truncate file */
164	switch (fOpen & RTFILE_O_ACTION_MASK)
165	{
166	case RTFILE_O_OPEN: break;
167	case RTFILE_O_OPEN_CREATE: fOpenMode \|= O_CREAT; break;
168	case RTFILE_O_CREATE: fOpenMode \|= O_CREAT \| O_EXCL; break;
169	case RTFILE_O_CREATE_REPLACE: fOpenMode \|= O_CREAT \| O_TRUNC; break; /** @todo replacing needs fixing, this is not a 1:1 mapping! */
170	}
171	if (fOpen & RTFILE_O_TRUNCATE)
172	fOpenMode \|= O_TRUNC;
173
174	switch (fOpen & RTFILE_O_ACCESS_MASK)
175	{
176	case RTFILE_O_READ:
177	fOpenMode \|= O_RDONLY; /* RTFILE_O_APPEND is ignored. */
178	break;
179	case RTFILE_O_WRITE:
180	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_WRONLY : O_WRONLY;
181	break;
182	case RTFILE_O_READWRITE:
183	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_RDWR : O_RDWR;
184	break;
185	default:
186	AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#llx\n", fOpen));
187	return VERR_INVALID_PARAMETER;
188	}
189
190	/* File mode. */
191	int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
192	? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
193	: RT_FILE_PERMISSION;
194
195	/** @todo sharing! */
196
197	/*
198	* Open/create the file.
199	*/
200	char const *pszNativeFilename;
201	rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
202	if (RT_FAILURE(rc))
203	return (rc);
204
205	int fh = open(pszNativeFilename, fOpenMode, fMode);
206	int iErr = errno;
207
208	#ifdef O_CLOEXEC
209	if ( (fOpenMode & O_CLOEXEC)
210	&& s_fHave_O_CLOEXEC == 0)
211	{
212	if (fh < 0 && iErr == EINVAL)
213	{
214	s_fHave_O_CLOEXEC = -1;
215	fh = open(pszNativeFilename, fOpenMode, fMode);
216	iErr = errno;
217	}
218	else if (fh >= 0)
219	s_fHave_O_CLOEXEC = fcntl(fh, F_GETFD, 0) > 0 ? 1 : -1;
220	}
221	#endif
222
223	rtPathFreeNative(pszNativeFilename, pszFilename);
224	if (fh >= 0)
225	{
226	iErr = 0;
227
228	/*
229	* Mark the file handle close on exec, unless inherit is specified.
230	*/
231	if ( !(fOpen & RTFILE_O_INHERIT)
232	#ifdef O_NOINHERIT
233	&& !(fOpenMode & O_NOINHERIT) /* Take care since it might be a zero value dummy. */
234	#endif
235	#ifdef O_CLOEXEC
236	&& s_fHave_O_CLOEXEC <= 0
237	#endif
238	)
239	iErr = fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0 ? 0 : errno;
240
241	/*
242	* Switch direct I/O on now if requested and required.
243	*/
244	#if defined(RT_OS_DARWIN) \
245	\|\| (defined(RT_OS_SOLARIS) && !defined(IN_GUEST))
246	if (iErr == 0 && (fOpen & RTFILE_O_NO_CACHE))
247	{
248	# if defined(RT_OS_DARWIN)
249	iErr = fcntl(fh, F_NOCACHE, 1) >= 0 ? 0 : errno;
250	# else
251	iErr = directio(fh, DIRECTIO_ON) >= 0 ? 0 : errno;
252	# endif
253	}
254	#endif
255
256	/*
257	* Implement / emulate file sharing.
258	*
259	* We need another mode which allows skipping this stuff completely
260	* and do things the UNIX way. So for the present this is just a debug
261	* aid that can be enabled by developers too lazy to test on Windows.
262	*/
263	#if 0 && defined(RT_OS_LINUX)
264	if (iErr == 0)
265	{
266	/* This approach doesn't work because only knfsd checks for these
267	buggers. :-( */
268	int iLockOp;
269	switch (fOpen & RTFILE_O_DENY_MASK)
270	{
271	default:
272	AssertFailed();
273	case RTFILE_O_DENY_NONE:
274	case RTFILE_O_DENY_NOT_DELETE:
275	iLockOp = LOCK_MAND \| LOCK_READ \| LOCK_WRITE;
276	break;
277	case RTFILE_O_DENY_READ:
278	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
279	iLockOp = LOCK_MAND \| LOCK_WRITE;
280	break;
281	case RTFILE_O_DENY_WRITE:
282	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
283	iLockOp = LOCK_MAND \| LOCK_READ;
284	break;
285	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
286	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
287	iLockOp = LOCK_MAND;
288	break;
289	}
290	iErr = flock(fh, iLockOp \| LOCK_NB);
291	if (iErr != 0)
292	iErr = errno == EAGAIN ? ETXTBSY : 0;
293	}
294	#endif /* 0 && RT_OS_LINUX */
295	#if defined(DEBUG_bird) && !defined(RT_OS_SOLARIS)
296	if (iErr == 0)
297	{
298	/* This emulation is incomplete but useful. */
299	switch (fOpen & RTFILE_O_DENY_MASK)
300	{
301	default:
302	AssertFailed();
303	case RTFILE_O_DENY_NONE:
304	case RTFILE_O_DENY_NOT_DELETE:
305	case RTFILE_O_DENY_READ:
306	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
307	break;
308	case RTFILE_O_DENY_WRITE:
309	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
310	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
311	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
312	if (fOpen & RTFILE_O_WRITE)
313	{
314	iErr = flock(fh, LOCK_EX \| LOCK_NB);
315	if (iErr != 0)
316	iErr = errno == EAGAIN ? ETXTBSY : 0;
317	}
318	break;
319	}
320	}
321	#endif
322	#ifdef RT_OS_SOLARIS
323	/** @todo Use fshare_t and associates, it's a perfect match. see sys/fcntl.h */
324	#endif
325
326	/*
327	* We're done.
328	*/
329	if (iErr == 0)
330	{
331	*pFile = (RTFILE)(uintptr_t)fh;
332	Assert((intptr_t)*pFile == fh);
333	LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#llx): returns %Rrc\n",
334	pFile, *pFile, pszFilename, pszFilename, fOpen, rc));
335	return VINF_SUCCESS;
336	}
337
338	close(fh);
339	}
340	return RTErrConvertFromErrno(iErr);
341	}
342
343
344	RTR3DECL(int) RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
345	{
346	AssertReturn( fAccess == RTFILE_O_READ
347	\|\| fAccess == RTFILE_O_WRITE
348	\|\| fAccess == RTFILE_O_READWRITE,
349	VERR_INVALID_PARAMETER);
350	return RTFileOpen(phFile, "/dev/null", fAccess \| RTFILE_O_DENY_NONE \| RTFILE_O_OPEN);
351	}
352
353
354	RTR3DECL(int) RTFileClose(RTFILE hFile)
355	{
356	if (hFile == NIL_RTFILE)
357	return VINF_SUCCESS;
358	if (close(RTFileToNative(hFile)) == 0)
359	return VINF_SUCCESS;
360	return RTErrConvertFromErrno(errno);
361	}
362
363
364	RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
365	{
366	AssertCompile(sizeof(uNative) == sizeof(*pFile));
367	if (uNative < 0)
368	{
369	AssertMsgFailed(("%p\n", uNative));
370	*pFile = NIL_RTFILE;
371	return VERR_INVALID_HANDLE;
372	}
373	*pFile = (RTFILE)uNative;
374	return VINF_SUCCESS;
375	}
376
377
378	RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
379	{
380	AssertReturn(hFile != NIL_RTFILE, -1);
381	return (intptr_t)hFile;
382	}
383
384
385	RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
386	{
387	int fd;
388	switch (enmStdHandle)
389	{
390	case RTHANDLESTD_INPUT: fd = 0; break;
391	case RTHANDLESTD_OUTPUT: fd = 1; break;
392	case RTHANDLESTD_ERROR: fd = 2; break;
393	break;
394	default:
395	AssertFailedReturn(NIL_RTFILE);
396	}
397
398	struct stat st;
399	int rc = fstat(fd, &st);
400	if (rc == -1)
401	return NIL_RTFILE;
402	return (RTFILE)(intptr_t)fd;
403	}
404
405
406	RTR3DECL(int) RTFileDelete(const char *pszFilename)
407	{
408	char const *pszNativeFilename;
409	int rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
410	if (RT_SUCCESS(rc))
411	{
412	if (unlink(pszNativeFilename) != 0)
413	rc = RTErrConvertFromErrno(errno);
414	rtPathFreeNative(pszNativeFilename, pszFilename);
415	}
416	return rc;
417	}
418
419
420	RTR3DECL(int) RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
421	{
422	static const unsigned aSeekRecode[] =
423	{
424	SEEK_SET,
425	SEEK_CUR,
426	SEEK_END,
427	};
428
429	/*
430	* Validate input.
431	*/
432	if (uMethod > RTFILE_SEEK_END)
433	{
434	AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
435	return VERR_INVALID_PARAMETER;
436	}
437
438	/* check that within off_t range. */
439	if ( sizeof(off_t) < sizeof(offSeek)
440	&& ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
441	\|\| (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
442	{
443	AssertMsgFailed(("64-bit search not supported\n"));
444	return VERR_NOT_SUPPORTED;
445	}
446
447	off_t offCurrent = lseek(RTFileToNative(hFile), (off_t)offSeek, aSeekRecode[uMethod]);
448	if (offCurrent != ~0)
449	{
450	if (poffActual)
451	*poffActual = (uint64_t)offCurrent;
452	return VINF_SUCCESS;
453	}
454	return RTErrConvertFromErrno(errno);
455	}
456
457
458	RTR3DECL(int) RTFileRead(RTFILE hFile, void pvBuf, size_t cbToRead, size_t pcbRead)
459	{
460	if (cbToRead <= 0)
461	return VINF_SUCCESS;
462
463	/*
464	* Attempt read.
465	*/
466	ssize_t cbRead = read(RTFileToNative(hFile), pvBuf, cbToRead);
467	if (cbRead >= 0)
468	{
469	if (pcbRead)
470	/* caller can handle partial read. */
471	*pcbRead = cbRead;
472	else
473	{
474	/* Caller expects all to be read. */
475	while ((ssize_t)cbToRead > cbRead)
476	{
477	ssize_t cbReadPart = read(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead);
478	if (cbReadPart <= 0)
479	{
480	if (cbReadPart == 0)
481	return VERR_EOF;
482	return RTErrConvertFromErrno(errno);
483	}
484	cbRead += cbReadPart;
485	}
486	}
487	return VINF_SUCCESS;
488	}
489
490	return RTErrConvertFromErrno(errno);
491	}
492
493
494	RTR3DECL(int) RTFileWrite(RTFILE hFile, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
495	{
496	if (cbToWrite <= 0)
497	return VINF_SUCCESS;
498
499	/*
500	* Attempt write.
501	*/
502	ssize_t cbWritten = write(RTFileToNative(hFile), pvBuf, cbToWrite);
503	if (cbWritten >= 0)
504	{
505	if (pcbWritten)
506	/* caller can handle partial write. */
507	*pcbWritten = cbWritten;
508	else
509	{
510	/* Caller expects all to be write. */
511	while ((ssize_t)cbToWrite > cbWritten)
512	{
513	ssize_t cbWrittenPart = write(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
514	if (cbWrittenPart <= 0)
515	return RTErrConvertFromErrno(errno);
516	cbWritten += cbWrittenPart;
517	}
518	}
519	return VINF_SUCCESS;
520	}
521	return RTErrConvertFromErrno(errno);
522	}
523
524
525	RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
526	{
527	/*
528	* Validate offset.
529	*/
530	if ( sizeof(off_t) < sizeof(cbSize)
531	&& (cbSize >> 32) != 0)
532	{
533	AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
534	return VERR_NOT_SUPPORTED;
535	}
536
537	#if defined(_MSC_VER) \|\| (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006))
538	if (chsize(RTFileToNative(hFile), (off_t)cbSize) == 0)
539	#else
540	/* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
541	* LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
542	* than the file.)
543	*/
544	if (ftruncate(RTFileToNative(hFile), (off_t)cbSize) == 0)
545	#endif
546	return VINF_SUCCESS;
547	return RTErrConvertFromErrno(errno);
548	}
549
550
551	RTR3DECL(int) RTFileGetSize(RTFILE hFile, uint64_t *pcbSize)
552	{
553	/*
554	* Ask fstat() first.
555	*/
556	struct stat st;
557	if (!fstat(RTFileToNative(hFile), &st))
558	{
559	*pcbSize = st.st_size;
560	if ( st.st_size != 0
561	#if defined(RT_OS_SOLARIS)
562	\|\| (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
563	#elif defined(RT_OS_FREEBSD)
564	\|\| !S_ISCHR(st.st_mode)
565	#else
566	\|\| !S_ISBLK(st.st_mode)
567	#endif
568	)
569	return VINF_SUCCESS;
570
571	/*
572	* It could be a block device. Try determin the size by I/O control
573	* query or seek.
574	*/
575	#ifdef RT_OS_DARWIN
576	uint64_t cBlocks;
577	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKCOUNT, &cBlocks))
578	{
579	uint32_t cbBlock;
580	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKSIZE, &cbBlock))
581	{
582	pcbSize = cBlocks cbBlock;
583	return VINF_SUCCESS;
584	}
585	}
586	/* must be a block device, fail on failure. */
587
588	#elif defined(RT_OS_SOLARIS)
589	struct dk_minfo MediaInfo;
590	if (!ioctl(RTFileToNative(hFile), DKIOCGMEDIAINFO, &MediaInfo))
591	{
592	pcbSize = MediaInfo.dki_capacity MediaInfo.dki_lbsize;
593	return VINF_SUCCESS;
594	}
595	/* might not be a block device. */
596	if (errno == EINVAL \|\| errno == ENOTTY)
597	return VINF_SUCCESS;
598
599	#elif defined(RT_OS_FREEBSD)
600	off_t cbMedia = 0;
601	if (!ioctl(RTFileToNative(hFile), DIOCGMEDIASIZE, &cbMedia))
602	{
603	*pcbSize = cbMedia;
604	return VINF_SUCCESS;
605	}
606	/* might not be a block device. */
607	if (errno == EINVAL \|\| errno == ENOTTY)
608	return VINF_SUCCESS;
609
610	#else
611	/* PORTME! Avoid this path when possible. */
612	uint64_t offSaved;
613	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offSaved);
614	if (RT_SUCCESS(rc))
615	{
616	rc = RTFileSeek(hFile, 0, RTFILE_SEEK_END, pcbSize);
617	int rc2 = RTFileSeek(hFile, offSaved, RTFILE_SEEK_BEGIN, NULL);
618	if (RT_SUCCESS(rc))
619	return rc2;
620	}
621	#endif
622	}
623	return RTErrConvertFromErrno(errno);
624	}
625
626
627	RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
628	{
629	/*
630	* Save the current location
631	*/
632	uint64_t offOld;
633	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offOld);
634	if (RT_FAILURE(rc))
635	return rc;
636
637	/*
638	* Perform a binary search for the max file size.
639	*/
640	uint64_t offLow = 0;
641	uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
642	/** @todo Unfortunately this does not work for certain file system types,
643	* for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
644	* file systems. */
645	//uint64_t offHigh = INT64_MAX;
646	for (;;)
647	{
648	uint64_t cbInterval = (offHigh - offLow) >> 1;
649	if (cbInterval == 0)
650	{
651	if (pcbMax)
652	*pcbMax = offLow;
653	return RTFileSeek(hFile, offOld, RTFILE_SEEK_BEGIN, NULL);
654	}
655
656	rc = RTFileSeek(hFile, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
657	if (RT_FAILURE(rc))
658	offHigh = offLow + cbInterval;
659	else
660	offLow = offLow + cbInterval;
661	}
662	}
663
664
665	RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
666	{
667	if (hFile != NIL_RTFILE)
668	{
669	int fFlags = fcntl(RTFileToNative(hFile), F_GETFD);
670	if (fFlags >= 0)
671	return true;
672	}
673	return false;
674	}
675
676
677	RTR3DECL(int) RTFileFlush(RTFILE hFile)
678	{
679	if (fsync(RTFileToNative(hFile)))
680	return RTErrConvertFromErrno(errno);
681	return VINF_SUCCESS;
682	}
683
684
685	RTR3DECL(int) RTFileIoCtl(RTFILE hFile, unsigned long ulRequest, void pvData, unsigned cbData, int piRet)
686	{
687	NOREF(cbData);
688	int rc = ioctl(RTFileToNative(hFile), ulRequest, pvData);
689	if (piRet)
690	*piRet = rc;
691	return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
692	}
693
694
695	RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
696	{
697	/*
698	* Normalize the mode and call the API.
699	*/
700	fMode = rtFsModeNormalize(fMode, NULL, 0);
701	if (!rtFsModeIsValid(fMode))
702	return VERR_INVALID_PARAMETER;
703
704	if (fchmod(RTFileToNative(hFile), fMode & RTFS_UNIX_MASK))
705	{
706	int rc = RTErrConvertFromErrno(errno);
707	Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", hFile, fMode, rc));
708	return rc;
709	}
710	return VINF_SUCCESS;
711	}
712
713
714	RTR3DECL(int) RTFileRename(const char pszSrc, const char pszDst, unsigned fRename)
715	{
716	/*
717	* Validate input.
718	*/
719	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
720	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
721	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
722	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
723	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
724
725	/*
726	* Take common cause with RTPathRename.
727	*/
728	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
729
730	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
731	pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
732	return rc;
733	}
734

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source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp@ 43363

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