fileio-posix.cpp@ 78253

Last change on this file since 78253 was 77684, checked in by vboxsync, 6 years ago
IPRT: Implemented RTFileOpenEx for posix too. ticketref:9276
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1	/* $Id: fileio-posix.cpp 77684 2019-03-13 16:39:57Z vboxsync $ */
2	/** @file
3	* IPRT - File I/O, POSIX, Part 1.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 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 <iprt/thread.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	/*********************************************************************************************************************************
85	* Defined Constants And Macros *
86	*********************************************************************************************************************************/
87	#ifdef O_CLOEXEC
88	static int volatile g_fHave_O_CLOEXEC = 0; /* {-1,0,1}; since Linux 2.6.23 */
89	#endif
90
91
92
93	RTDECL(bool) RTFileExists(const char *pszPath)
94	{
95	bool fRc = false;
96	char const *pszNativePath;
97	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
98	if (RT_SUCCESS(rc))
99	{
100	struct stat s;
101	fRc = !stat(pszNativePath, &s)
102	&& S_ISREG(s.st_mode);
103
104	rtPathFreeNative(pszNativePath, pszPath);
105	}
106
107	LogFlow(("RTFileExists(%p={%s}): returns %RTbool\n", pszPath, pszPath, fRc));
108	return fRc;
109	}
110
111
112	#ifdef O_CLOEXEC
113	/** Worker for RTFileOpenEx that detects whether the kernel supports
114	* O_CLOEXEC or not, setting g_fHave_O_CLOEXEC to 1 or -1 accordingly. */
115	static int rtFileOpenExDetectCloExecSupport(void)
116	{
117	/*
118	* Open /dev/null with O_CLOEXEC and see if FD_CLOEXEC is set or not.
119	*/
120	int fHave_O_CLOEXEC = -1;
121	int fd = open("/dev/null", O_RDONLY \| O_CLOEXEC, 0);
122	if (fd >= 0)
123	{
124	int fFlags = fcntl(fd, F_GETFD, 0);
125	fHave_O_CLOEXEC = fFlags > 0 && (fFlags & FD_CLOEXEC) ? 1 : -1;
126	close(fd);
127	}
128	else
129	AssertMsg(errno == EINVAL, ("%d\n", errno));
130	g_fHave_O_CLOEXEC = fHave_O_CLOEXEC;
131	return fHave_O_CLOEXEC;
132	}
133	#endif
134
135
136	RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
137	{
138	return RTFileOpenEx(pszFilename, fOpen, pFile, NULL);
139	}
140
141
142	RTDECL(int) RTFileOpenEx(const char *pszFilename, uint64_t fOpen, PRTFILE phFile, PRTFILEACTION penmActionTaken)
143	{
144	/*
145	* Validate input.
146	*/
147	AssertPtrReturn(phFile, VERR_INVALID_POINTER);
148	*phFile = NIL_RTFILE;
149	if (penmActionTaken)
150	*penmActionTaken = RTFILEACTION_INVALID;
151	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
152
153	/*
154	* Merge forced open flags and validate them.
155	*/
156	int rc = rtFileRecalcAndValidateFlags(&fOpen);
157	if (RT_FAILURE(rc))
158	return rc;
159	#ifndef O_NONBLOCK
160	AssertReturn(!(fOpen & RTFILE_O_NON_BLOCK), VERR_INVALID_FLAGS);
161	#endif
162
163	/*
164	* Calculate open mode flags.
165	*/
166	int fOpenMode = 0;
167	#ifdef O_BINARY
168	fOpenMode \|= O_BINARY; /* (pc) */
169	#endif
170	#ifdef O_LARGEFILE
171	fOpenMode \|= O_LARGEFILE; /* (linux, solaris) */
172	#endif
173	#ifdef O_NOINHERIT
174	if (!(fOpen & RTFILE_O_INHERIT))
175	fOpenMode \|= O_NOINHERIT;
176	#endif
177	#ifdef O_CLOEXEC
178	int fHave_O_CLOEXEC = g_fHave_O_CLOEXEC;
179	if ( !(fOpen & RTFILE_O_INHERIT)
180	&& ( fHave_O_CLOEXEC > 0
181	\|\| ( fHave_O_CLOEXEC == 0
182	&& (fHave_O_CLOEXEC = rtFileOpenExDetectCloExecSupport()) > 0)))
183	fOpenMode \|= O_CLOEXEC;
184	#endif
185	#ifdef O_NONBLOCK
186	if (fOpen & RTFILE_O_NON_BLOCK)
187	fOpenMode \|= O_NONBLOCK;
188	#endif
189	#ifdef O_SYNC
190	if (fOpen & RTFILE_O_WRITE_THROUGH)
191	fOpenMode \|= O_SYNC;
192	#endif
193	#if defined(O_DIRECT) && defined(RT_OS_LINUX)
194	/* O_DIRECT is mandatory to get async I/O working on Linux. */
195	if (fOpen & RTFILE_O_ASYNC_IO)
196	fOpenMode \|= O_DIRECT;
197	#endif
198	#if defined(O_DIRECT) && (defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD) \|\| defined(RT_OS_NETBSD))
199	/* Disable the kernel cache. */
200	if (fOpen & RTFILE_O_NO_CACHE)
201	fOpenMode \|= O_DIRECT;
202	#endif
203
204	/* create/truncate file */
205	switch (fOpen & RTFILE_O_ACTION_MASK)
206	{
207	case RTFILE_O_OPEN: break;
208	case RTFILE_O_OPEN_CREATE: fOpenMode \|= O_CREAT; break;
209	case RTFILE_O_CREATE: fOpenMode \|= O_CREAT \| O_EXCL; break;
210	case RTFILE_O_CREATE_REPLACE: fOpenMode \|= O_CREAT \| O_TRUNC; break; /** @todo replacing needs fixing, this is not a 1:1 mapping! */
211	default:
212	AssertMsgFailed(("fOpen=%#llx\n", fOpen));
213	fOpen = (fOpen & ~RTFILE_O_ACTION_MASK) \| RTFILE_O_OPEN;
214	break;
215
216	}
217	if ( (fOpen & RTFILE_O_TRUNCATE)
218	&& (fOpen & RTFILE_O_ACTION_MASK) != RTFILE_O_CREATE)
219	fOpenMode \|= O_TRUNC;
220
221	switch (fOpen & RTFILE_O_ACCESS_MASK)
222	{
223	case RTFILE_O_READ:
224	fOpenMode \|= O_RDONLY; /* RTFILE_O_APPEND is ignored. */
225	break;
226	case RTFILE_O_WRITE:
227	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_WRONLY : O_WRONLY;
228	break;
229	case RTFILE_O_READWRITE:
230	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_RDWR : O_RDWR;
231	break;
232	default:
233	AssertMsgFailedReturn(("RTFileOpen received an invalid RW value, fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
234	}
235
236	/* File mode. */
237	int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
238	? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
239	: RT_FILE_PERMISSION;
240
241	/** @todo sharing? */
242
243	/*
244	* Open/create the file.
245	*/
246	char const *pszNativeFilename;
247	rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
248	if (RT_FAILURE(rc))
249	return (rc);
250
251	int fh;
252	int iErr;
253	if (!penmActionTaken)
254	{
255	fh = open(pszNativeFilename, fOpenMode, fMode);
256	iErr = errno;
257	}
258	else
259	{
260	/* We need to know exactly which action was taken by open, Windows &
261	OS/2 style. Can be tedious and subject to races: */
262	switch (fOpen & RTFILE_O_ACTION_MASK)
263	{
264	case RTFILE_O_OPEN:
265	Assert(!(fOpenMode & O_CREAT));
266	Assert(!(fOpenMode & O_EXCL));
267	fh = open(pszNativeFilename, fOpenMode, fMode);
268	iErr = errno;
269	if (fh >= 0)
270	*penmActionTaken = fOpenMode & O_TRUNC ? RTFILEACTION_TRUNCATED : RTFILEACTION_OPENED;
271	break;
272
273	case RTFILE_O_CREATE:
274	Assert(fOpenMode & O_CREAT);
275	Assert(fOpenMode & O_EXCL);
276	fh = open(pszNativeFilename, fOpenMode, fMode);
277	iErr = errno;
278	if (fh >= 0)
279	*penmActionTaken = RTFILEACTION_CREATED;
280	else if (iErr == EEXIST)
281	*penmActionTaken = RTFILEACTION_ALREADY_EXISTS;
282	break;
283
284	case RTFILE_O_OPEN_CREATE:
285	case RTFILE_O_CREATE_REPLACE:
286	{
287	Assert(fOpenMode & O_CREAT);
288	Assert(!(fOpenMode & O_EXCL));
289	int iTries = 64;
290	while (iTries-- > 0)
291	{
292	/* Yield the CPU if we've raced too long. */
293	if (iTries < 4)
294	RTThreadSleep(2 - (iTries & 1));
295
296	/* Try exclusive creation first: */
297	fh = open(pszNativeFilename, fOpenMode \| O_EXCL, fMode);
298	iErr = errno;
299	if (fh >= 0)
300	{
301	*penmActionTaken = RTFILEACTION_CREATED;
302	break;
303	}
304	if (iErr != EEXIST)
305	break;
306
307	/* If the file exists, try open it: */
308	fh = open(pszNativeFilename, fOpenMode & ~O_CREAT, fMode);
309	iErr = errno;
310	if (fh >= 0)
311	{
312	if ((fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE)
313	*penmActionTaken = fOpenMode & O_TRUNC ? RTFILEACTION_TRUNCATED : RTFILEACTION_OPENED;
314	else
315	*penmActionTaken = RTFILEACTION_REPLACED;
316	break;
317	}
318	if (iErr != ENOENT)
319	break;
320	}
321	Assert(iTries >= 0);
322	if (iTries < 0)
323	{
324	/* Thanks for the race, but we need to get on with things. */
325	fh = open(pszNativeFilename, fOpenMode, fMode);
326	iErr = errno;
327	if (fh >= 0)
328	*penmActionTaken = RTFILEACTION_OPENED;
329	}
330	break;
331	}
332
333	default:
334	AssertMsgFailed(("fOpen=%#llx fOpenMode=%#x\n", fOpen, fOpenMode));
335	iErr = EINVAL;
336	fh = -1;
337	break;
338	}
339	}
340
341	rtPathFreeNative(pszNativeFilename, pszFilename);
342	if (fh >= 0)
343	{
344	iErr = 0;
345
346	/*
347	* Mark the file handle close on exec, unless inherit is specified.
348	*/
349	if ( !(fOpen & RTFILE_O_INHERIT)
350	#ifdef O_NOINHERIT
351	&& !(fOpenMode & O_NOINHERIT) /* Take care since it might be a zero value dummy. */
352	#endif
353	#ifdef O_CLOEXEC
354	&& fHave_O_CLOEXEC <= 0
355	#endif
356	)
357	iErr = fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0 ? 0 : errno;
358
359	/*
360	* Switch direct I/O on now if requested and required.
361	*/
362	#if defined(RT_OS_DARWIN) \
363	\|\| (defined(RT_OS_SOLARIS) && !defined(IN_GUEST))
364	if (iErr == 0 && (fOpen & RTFILE_O_NO_CACHE))
365	{
366	# if defined(RT_OS_DARWIN)
367	iErr = fcntl(fh, F_NOCACHE, 1) >= 0 ? 0 : errno;
368	# else
369	iErr = directio(fh, DIRECTIO_ON) >= 0 ? 0 : errno;
370	# endif
371	}
372	#endif
373
374	/*
375	* Implement / emulate file sharing.
376	*
377	* We need another mode which allows skipping this stuff completely
378	* and do things the UNIX way. So for the present this is just a debug
379	* aid that can be enabled by developers too lazy to test on Windows.
380	*/
381	#if 0 && defined(RT_OS_LINUX)
382	if (iErr == 0)
383	{
384	/* This approach doesn't work because only knfsd checks for these
385	buggers. :-( */
386	int iLockOp;
387	switch (fOpen & RTFILE_O_DENY_MASK)
388	{
389	default:
390	AssertFailed();
391	case RTFILE_O_DENY_NONE:
392	case RTFILE_O_DENY_NOT_DELETE:
393	iLockOp = LOCK_MAND \| LOCK_READ \| LOCK_WRITE;
394	break;
395	case RTFILE_O_DENY_READ:
396	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
397	iLockOp = LOCK_MAND \| LOCK_WRITE;
398	break;
399	case RTFILE_O_DENY_WRITE:
400	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
401	iLockOp = LOCK_MAND \| LOCK_READ;
402	break;
403	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
404	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
405	iLockOp = LOCK_MAND;
406	break;
407	}
408	iErr = flock(fh, iLockOp \| LOCK_NB);
409	if (iErr != 0)
410	iErr = errno == EAGAIN ? ETXTBSY : 0;
411	}
412	#endif /* 0 && RT_OS_LINUX */
413	#if defined(DEBUG_bird) && !defined(RT_OS_SOLARIS)
414	if (iErr == 0)
415	{
416	/* This emulation is incomplete but useful. */
417	switch (fOpen & RTFILE_O_DENY_MASK)
418	{
419	default:
420	AssertFailed();
421	case RTFILE_O_DENY_NONE:
422	case RTFILE_O_DENY_NOT_DELETE:
423	case RTFILE_O_DENY_READ:
424	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
425	break;
426	case RTFILE_O_DENY_WRITE:
427	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
428	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
429	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
430	if (fOpen & RTFILE_O_WRITE)
431	{
432	iErr = flock(fh, LOCK_EX \| LOCK_NB);
433	if (iErr != 0)
434	iErr = errno == EAGAIN ? ETXTBSY : 0;
435	}
436	break;
437	}
438	}
439	#endif
440	#ifdef RT_OS_SOLARIS
441	/** @todo Use fshare_t and associates, it's a perfect match. see sys/fcntl.h */
442	#endif
443
444	/*
445	* We're done.
446	*/
447	if (iErr == 0)
448	{
449	*phFile = (RTFILE)(uintptr_t)fh;
450	Assert((intptr_t)*phFile == fh);
451	LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#llx): returns %Rrc\n",
452	phFile, *phFile, pszFilename, pszFilename, fOpen, rc));
453	return VINF_SUCCESS;
454	}
455
456	close(fh);
457	}
458	return RTErrConvertFromErrno(iErr);
459	}
460
461
462	RTR3DECL(int) RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
463	{
464	AssertReturn( fAccess == RTFILE_O_READ
465	\|\| fAccess == RTFILE_O_WRITE
466	\|\| fAccess == RTFILE_O_READWRITE,
467	VERR_INVALID_PARAMETER);
468	return RTFileOpen(phFile, "/dev/null", fAccess \| RTFILE_O_DENY_NONE \| RTFILE_O_OPEN);
469	}
470
471
472	RTR3DECL(int) RTFileClose(RTFILE hFile)
473	{
474	if (hFile == NIL_RTFILE)
475	return VINF_SUCCESS;
476	if (close(RTFileToNative(hFile)) == 0)
477	return VINF_SUCCESS;
478	return RTErrConvertFromErrno(errno);
479	}
480
481
482	RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
483	{
484	AssertCompile(sizeof(uNative) == sizeof(*pFile));
485	if (uNative < 0)
486	{
487	AssertMsgFailed(("%p\n", uNative));
488	*pFile = NIL_RTFILE;
489	return VERR_INVALID_HANDLE;
490	}
491	*pFile = (RTFILE)uNative;
492	return VINF_SUCCESS;
493	}
494
495
496	RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
497	{
498	AssertReturn(hFile != NIL_RTFILE, -1);
499	return (intptr_t)hFile;
500	}
501
502
503	RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
504	{
505	int fd;
506	switch (enmStdHandle)
507	{
508	case RTHANDLESTD_INPUT: fd = 0; break;
509	case RTHANDLESTD_OUTPUT: fd = 1; break;
510	case RTHANDLESTD_ERROR: fd = 2; break;
511	default:
512	AssertFailedReturn(NIL_RTFILE);
513	}
514
515	struct stat st;
516	int rc = fstat(fd, &st);
517	if (rc == -1)
518	return NIL_RTFILE;
519	return (RTFILE)(intptr_t)fd;
520	}
521
522
523	RTR3DECL(int) RTFileDelete(const char *pszFilename)
524	{
525	char const *pszNativeFilename;
526	int rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
527	if (RT_SUCCESS(rc))
528	{
529	if (unlink(pszNativeFilename) != 0)
530	rc = RTErrConvertFromErrno(errno);
531	rtPathFreeNative(pszNativeFilename, pszFilename);
532	}
533	return rc;
534	}
535
536
537	RTR3DECL(int) RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
538	{
539	static const unsigned aSeekRecode[] =
540	{
541	SEEK_SET,
542	SEEK_CUR,
543	SEEK_END,
544	};
545
546	/*
547	* Validate input.
548	*/
549	if (uMethod > RTFILE_SEEK_END)
550	{
551	AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
552	return VERR_INVALID_PARAMETER;
553	}
554
555	/* check that within off_t range. */
556	if ( sizeof(off_t) < sizeof(offSeek)
557	&& ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
558	\|\| (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
559	{
560	AssertMsgFailed(("64-bit search not supported\n"));
561	return VERR_NOT_SUPPORTED;
562	}
563
564	off_t offCurrent = lseek(RTFileToNative(hFile), (off_t)offSeek, aSeekRecode[uMethod]);
565	if (offCurrent != ~0)
566	{
567	if (poffActual)
568	*poffActual = (uint64_t)offCurrent;
569	return VINF_SUCCESS;
570	}
571	return RTErrConvertFromErrno(errno);
572	}
573
574
575	RTR3DECL(int) RTFileRead(RTFILE hFile, void pvBuf, size_t cbToRead, size_t pcbRead)
576	{
577	if (cbToRead <= 0)
578	{
579	if (pcbRead)
580	*pcbRead = 0;
581	return VINF_SUCCESS;
582	}
583
584	/*
585	* Attempt read.
586	*/
587	ssize_t cbRead = read(RTFileToNative(hFile), pvBuf, cbToRead);
588	if (cbRead >= 0)
589	{
590	if (pcbRead)
591	/* caller can handle partial read. */
592	*pcbRead = cbRead;
593	else
594	{
595	/* Caller expects all to be read. */
596	while ((ssize_t)cbToRead > cbRead)
597	{
598	ssize_t cbReadPart = read(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead);
599	if (cbReadPart <= 0)
600	{
601	if (cbReadPart == 0)
602	return VERR_EOF;
603	return RTErrConvertFromErrno(errno);
604	}
605	cbRead += cbReadPart;
606	}
607	}
608	return VINF_SUCCESS;
609	}
610
611	return RTErrConvertFromErrno(errno);
612	}
613
614
615	RTR3DECL(int) RTFileWrite(RTFILE hFile, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
616	{
617	if (cbToWrite <= 0)
618	return VINF_SUCCESS;
619
620	/*
621	* Attempt write.
622	*/
623	ssize_t cbWritten = write(RTFileToNative(hFile), pvBuf, cbToWrite);
624	if (cbWritten >= 0)
625	{
626	if (pcbWritten)
627	/* caller can handle partial write. */
628	*pcbWritten = cbWritten;
629	else
630	{
631	/* Caller expects all to be write. */
632	while ((ssize_t)cbToWrite > cbWritten)
633	{
634	ssize_t cbWrittenPart = write(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
635	if (cbWrittenPart <= 0)
636	return cbWrittenPart < 0 ? RTErrConvertFromErrno(errno) : VERR_TRY_AGAIN;
637	cbWritten += cbWrittenPart;
638	}
639	}
640	return VINF_SUCCESS;
641	}
642	return RTErrConvertFromErrno(errno);
643	}
644
645
646	RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
647	{
648	/*
649	* Validate offset.
650	*/
651	if ( sizeof(off_t) < sizeof(cbSize)
652	&& (cbSize >> 32) != 0)
653	{
654	AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
655	return VERR_NOT_SUPPORTED;
656	}
657
658	#if defined(_MSC_VER) \|\| (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006))
659	if (chsize(RTFileToNative(hFile), (off_t)cbSize) == 0)
660	#else
661	/* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
662	* LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
663	* than the file.)
664	*/
665	if (ftruncate(RTFileToNative(hFile), (off_t)cbSize) == 0)
666	#endif
667	return VINF_SUCCESS;
668	return RTErrConvertFromErrno(errno);
669	}
670
671
672	RTR3DECL(int) RTFileGetSize(RTFILE hFile, uint64_t *pcbSize)
673	{
674	/*
675	* Ask fstat() first.
676	*/
677	struct stat st;
678	if (!fstat(RTFileToNative(hFile), &st))
679	{
680	*pcbSize = st.st_size;
681	if ( st.st_size != 0
682	#if defined(RT_OS_SOLARIS)
683	\|\| (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
684	#elif defined(RT_OS_FREEBSD) \|\| defined(RT_OS_NETBSD)
685	\|\| !S_ISCHR(st.st_mode)
686	#else
687	\|\| !S_ISBLK(st.st_mode)
688	#endif
689	)
690	return VINF_SUCCESS;
691
692	/*
693	* It could be a block device. Try determin the size by I/O control
694	* query or seek.
695	*/
696	#ifdef RT_OS_DARWIN
697	uint64_t cBlocks;
698	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKCOUNT, &cBlocks))
699	{
700	uint32_t cbBlock;
701	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKSIZE, &cbBlock))
702	{
703	pcbSize = cBlocks cbBlock;
704	return VINF_SUCCESS;
705	}
706	}
707	/* must be a block device, fail on failure. */
708
709	#elif defined(RT_OS_SOLARIS)
710	struct dk_minfo MediaInfo;
711	if (!ioctl(RTFileToNative(hFile), DKIOCGMEDIAINFO, &MediaInfo))
712	{
713	pcbSize = MediaInfo.dki_capacity MediaInfo.dki_lbsize;
714	return VINF_SUCCESS;
715	}
716	/* might not be a block device. */
717	if (errno == EINVAL \|\| errno == ENOTTY)
718	return VINF_SUCCESS;
719
720	#elif defined(RT_OS_FREEBSD)
721	off_t cbMedia = 0;
722	if (!ioctl(RTFileToNative(hFile), DIOCGMEDIASIZE, &cbMedia))
723	{
724	*pcbSize = cbMedia;
725	return VINF_SUCCESS;
726	}
727	/* might not be a block device. */
728	if (errno == EINVAL \|\| errno == ENOTTY)
729	return VINF_SUCCESS;
730
731	#else
732	/* PORTME! Avoid this path when possible. */
733	uint64_t offSaved;
734	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offSaved);
735	if (RT_SUCCESS(rc))
736	{
737	rc = RTFileSeek(hFile, 0, RTFILE_SEEK_END, pcbSize);
738	int rc2 = RTFileSeek(hFile, offSaved, RTFILE_SEEK_BEGIN, NULL);
739	if (RT_SUCCESS(rc))
740	return rc2;
741	}
742	#endif
743	}
744	return RTErrConvertFromErrno(errno);
745	}
746
747
748	RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
749	{
750	/*
751	* Save the current location
752	*/
753	uint64_t offOld;
754	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offOld);
755	if (RT_FAILURE(rc))
756	return rc;
757
758	/*
759	* Perform a binary search for the max file size.
760	*/
761	uint64_t offLow = 0;
762	uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
763	/** @todo Unfortunately this does not work for certain file system types,
764	* for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
765	* file systems. */
766	//uint64_t offHigh = INT64_MAX;
767	for (;;)
768	{
769	uint64_t cbInterval = (offHigh - offLow) >> 1;
770	if (cbInterval == 0)
771	{
772	if (pcbMax)
773	*pcbMax = offLow;
774	return RTFileSeek(hFile, offOld, RTFILE_SEEK_BEGIN, NULL);
775	}
776
777	rc = RTFileSeek(hFile, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
778	if (RT_FAILURE(rc))
779	offHigh = offLow + cbInterval;
780	else
781	offLow = offLow + cbInterval;
782	}
783	}
784
785
786	RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
787	{
788	if (hFile != NIL_RTFILE)
789	{
790	int fFlags = fcntl(RTFileToNative(hFile), F_GETFD);
791	if (fFlags >= 0)
792	return true;
793	}
794	return false;
795	}
796
797
798	RTR3DECL(int) RTFileFlush(RTFILE hFile)
799	{
800	if (fsync(RTFileToNative(hFile)))
801	return RTErrConvertFromErrno(errno);
802	return VINF_SUCCESS;
803	}
804
805
806	RTR3DECL(int) RTFileIoCtl(RTFILE hFile, unsigned long ulRequest, void pvData, unsigned cbData, int piRet)
807	{
808	NOREF(cbData);
809	int rc = ioctl(RTFileToNative(hFile), ulRequest, pvData);
810	if (piRet)
811	*piRet = rc;
812	return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
813	}
814
815
816	RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
817	{
818	/*
819	* Normalize the mode and call the API.
820	*/
821	fMode = rtFsModeNormalize(fMode, NULL, 0);
822	if (!rtFsModeIsValid(fMode))
823	return VERR_INVALID_PARAMETER;
824
825	if (fchmod(RTFileToNative(hFile), fMode & RTFS_UNIX_MASK))
826	{
827	int rc = RTErrConvertFromErrno(errno);
828	Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", hFile, fMode, rc));
829	return rc;
830	}
831	return VINF_SUCCESS;
832	}
833
834
835	RTDECL(int) RTFileSetOwner(RTFILE hFile, uint32_t uid, uint32_t gid)
836	{
837	uid_t uidNative = uid != NIL_RTUID ? (uid_t)uid : (uid_t)-1;
838	AssertReturn(uid == uidNative, VERR_INVALID_PARAMETER);
839	gid_t gidNative = gid != NIL_RTGID ? (gid_t)gid : (gid_t)-1;
840	AssertReturn(gid == gidNative, VERR_INVALID_PARAMETER);
841
842	if (fchown(RTFileToNative(hFile), uidNative, gidNative))
843	return RTErrConvertFromErrno(errno);
844	return VINF_SUCCESS;
845	}
846
847
848	RTR3DECL(int) RTFileRename(const char pszSrc, const char pszDst, unsigned fRename)
849	{
850	/*
851	* Validate input.
852	*/
853	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
854	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
855	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
856	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
857	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
858
859	/*
860	* Take common cause with RTPathRename.
861	*/
862	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
863
864	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
865	pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
866	return rc;
867	}
868

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source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp@ 78253

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