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fileio-posix.cpp

Last change on this file was 100561, checked in by vboxsync, 10 months ago
Runtime: Reorder some (at this point unused) code, bugref:10261
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 28.5 KB

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1	/* $Id: fileio-posix.cpp 100561 2023-07-13 09:58:36Z vboxsync $ */
2	/** @file
3	* IPRT - File I/O, POSIX, Part 1.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define LOG_GROUP RTLOGGROUP_FILE
42
43	#include <errno.h>
44	#include <sys/stat.h>
45	#include <sys/types.h>
46	#include <sys/ioctl.h>
47	#include <fcntl.h>
48	#ifdef _MSC_VER
49	# include <io.h>
50	# include <stdio.h>
51	#else
52	# include <unistd.h>
53	# include <sys/time.h>
54	#endif
55	#ifdef RT_OS_LINUX
56	# include <sys/file.h>
57	#endif
58	#if defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006)
59	# include <io.h>
60	#endif
61	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
62	# include <sys/disk.h>
63	#endif
64	#ifdef RT_OS_SOLARIS
65	# include <stropts.h>
66	# include <sys/dkio.h>
67	# include <sys/vtoc.h>
68	#endif /* RT_OS_SOLARIS */
69
70	#include <iprt/file.h>
71	#include <iprt/path.h>
72	#include <iprt/assert.h>
73	#include <iprt/string.h>
74	#include <iprt/err.h>
75	#include <iprt/log.h>
76	#include <iprt/thread.h>
77	#include "internal/file.h"
78	#include "internal/fs.h"
79	#include "internal/path.h"
80
81
82
83	/*********************************************************************************************************************************
84	* Defined Constants And Macros *
85	*********************************************************************************************************************************/
86	/** Default file permissions for newly created files. */
87	#if defined(S_IRUSR) && defined(S_IWUSR)
88	# define RT_FILE_PERMISSION (S_IRUSR \| S_IWUSR)
89	#else
90	# define RT_FILE_PERMISSION (00600)
91	#endif
92
93
94	/*********************************************************************************************************************************
95	* Defined Constants And Macros *
96	*********************************************************************************************************************************/
97	#ifdef O_CLOEXEC
98	static int volatile g_fHave_O_CLOEXEC = 0; /* {-1,0,1}; since Linux 2.6.23 */
99	#endif
100
101
102
103	RTDECL(bool) RTFileExists(const char *pszPath)
104	{
105	bool fRc = false;
106	char const *pszNativePath;
107	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
108	if (RT_SUCCESS(rc))
109	{
110	struct stat s;
111	fRc = !stat(pszNativePath, &s)
112	&& S_ISREG(s.st_mode);
113
114	rtPathFreeNative(pszNativePath, pszPath);
115	}
116
117	LogFlow(("RTFileExists(%p={%s}): returns %RTbool\n", pszPath, pszPath, fRc));
118	return fRc;
119	}
120
121
122	#ifdef O_CLOEXEC
123	/** Worker for RTFileOpenEx that detects whether the kernel supports
124	* O_CLOEXEC or not, setting g_fHave_O_CLOEXEC to 1 or -1 accordingly. */
125	static int rtFileOpenExDetectCloExecSupport(void)
126	{
127	/*
128	* Open /dev/null with O_CLOEXEC and see if FD_CLOEXEC is set or not.
129	*/
130	int fHave_O_CLOEXEC = -1;
131	int fd = open("/dev/null", O_RDONLY \| O_CLOEXEC, 0);
132	if (fd >= 0)
133	{
134	int fFlags = fcntl(fd, F_GETFD, 0);
135	fHave_O_CLOEXEC = fFlags > 0 && (fFlags & FD_CLOEXEC) ? 1 : -1;
136	close(fd);
137	}
138	else
139	AssertMsg(errno == EINVAL, ("%d\n", errno));
140	g_fHave_O_CLOEXEC = fHave_O_CLOEXEC;
141	return fHave_O_CLOEXEC;
142	}
143	#endif
144
145
146	RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
147	{
148	return RTFileOpenEx(pszFilename, fOpen, pFile, NULL);
149	}
150
151
152	RTDECL(int) RTFileOpenEx(const char *pszFilename, uint64_t fOpen, PRTFILE phFile, PRTFILEACTION penmActionTaken)
153	{
154	/*
155	* Validate input.
156	*/
157	AssertPtrReturn(phFile, VERR_INVALID_POINTER);
158	*phFile = NIL_RTFILE;
159	if (penmActionTaken)
160	*penmActionTaken = RTFILEACTION_INVALID;
161	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
162
163	/*
164	* Merge forced open flags and validate them.
165	*/
166	int rc = rtFileRecalcAndValidateFlags(&fOpen);
167	if (RT_FAILURE(rc))
168	return rc;
169	#ifndef O_NONBLOCK
170	AssertReturn(!(fOpen & RTFILE_O_NON_BLOCK), VERR_INVALID_FLAGS);
171	#endif
172	#if defined(RT_OS_OS2) /* Cannot delete open files on OS/2. */
173	AssertReturn(!(fOpen & RTFILE_O_TEMP_AUTO_DELETE), VERR_NOT_SUPPORTED);
174	#endif
175
176	/*
177	* Calculate open mode flags.
178	*/
179	int fOpenMode = 0;
180	#ifdef O_BINARY
181	fOpenMode \|= O_BINARY; /* (pc) */
182	#endif
183	#ifdef O_LARGEFILE
184	fOpenMode \|= O_LARGEFILE; /* (linux, solaris) */
185	#endif
186	#ifdef O_NOINHERIT
187	if (!(fOpen & RTFILE_O_INHERIT))
188	fOpenMode \|= O_NOINHERIT;
189	#endif
190	#ifdef O_CLOEXEC
191	int fHave_O_CLOEXEC = g_fHave_O_CLOEXEC;
192	if ( !(fOpen & RTFILE_O_INHERIT)
193	&& ( fHave_O_CLOEXEC > 0
194	\|\| ( fHave_O_CLOEXEC == 0
195	&& (fHave_O_CLOEXEC = rtFileOpenExDetectCloExecSupport()) > 0)))
196	fOpenMode \|= O_CLOEXEC;
197	#endif
198	#ifdef O_NONBLOCK
199	if (fOpen & RTFILE_O_NON_BLOCK)
200	fOpenMode \|= O_NONBLOCK;
201	#endif
202	#ifdef O_SYNC
203	if (fOpen & RTFILE_O_WRITE_THROUGH)
204	fOpenMode \|= O_SYNC;
205	#endif
206	#if defined(O_DIRECT) && defined(RT_OS_LINUX)
207	/* O_DIRECT is mandatory to get async I/O working on Linux. */
208	if (fOpen & RTFILE_O_ASYNC_IO)
209	fOpenMode \|= O_DIRECT;
210	#endif
211	#if defined(O_DIRECT) && (defined(RT_OS_LINUX) \|\| defined(RT_OS_FREEBSD) \|\| defined(RT_OS_NETBSD))
212	/* Disable the kernel cache. */
213	if (fOpen & RTFILE_O_NO_CACHE)
214	fOpenMode \|= O_DIRECT;
215	#endif
216
217	/* create/truncate file */
218	switch (fOpen & RTFILE_O_ACTION_MASK)
219	{
220	case RTFILE_O_OPEN: break;
221	case RTFILE_O_OPEN_CREATE: fOpenMode \|= O_CREAT; break;
222	case RTFILE_O_CREATE: fOpenMode \|= O_CREAT \| O_EXCL; break;
223	case RTFILE_O_CREATE_REPLACE: fOpenMode \|= O_CREAT \| O_TRUNC; break; /** @todo replacing needs fixing, this is not a 1:1 mapping! */
224	default:
225	AssertMsgFailed(("fOpen=%#llx\n", fOpen));
226	fOpen = (fOpen & ~RTFILE_O_ACTION_MASK) \| RTFILE_O_OPEN;
227	break;
228
229	}
230	if ( (fOpen & RTFILE_O_TRUNCATE)
231	&& (fOpen & RTFILE_O_ACTION_MASK) != RTFILE_O_CREATE)
232	fOpenMode \|= O_TRUNC;
233
234	switch (fOpen & RTFILE_O_ACCESS_MASK)
235	{
236	case RTFILE_O_READ:
237	fOpenMode \|= O_RDONLY; /* RTFILE_O_APPEND is ignored. */
238	break;
239	case RTFILE_O_WRITE:
240	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_WRONLY : O_WRONLY;
241	break;
242	case RTFILE_O_READWRITE:
243	fOpenMode \|= fOpen & RTFILE_O_APPEND ? O_APPEND \| O_RDWR : O_RDWR;
244	break;
245	default:
246	AssertMsgFailedReturn(("RTFileOpen received an invalid RW value, fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
247	}
248
249	/* File mode. */
250	int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
251	? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
252	: RT_FILE_PERMISSION;
253
254	/** @todo sharing? */
255
256	/*
257	* Open/create the file.
258	*/
259	char const *pszNativeFilename;
260	rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
261	if (RT_FAILURE(rc))
262	return (rc);
263
264	int fh;
265	int iErr;
266	if (!penmActionTaken)
267	{
268	fh = open(pszNativeFilename, fOpenMode, fMode);
269	iErr = errno;
270	}
271	else
272	{
273	/* We need to know exactly which action was taken by open, Windows &
274	OS/2 style. Can be tedious and subject to races: */
275	switch (fOpen & RTFILE_O_ACTION_MASK)
276	{
277	case RTFILE_O_OPEN:
278	Assert(!(fOpenMode & O_CREAT));
279	Assert(!(fOpenMode & O_EXCL));
280	fh = open(pszNativeFilename, fOpenMode, fMode);
281	iErr = errno;
282	if (fh >= 0)
283	*penmActionTaken = fOpenMode & O_TRUNC ? RTFILEACTION_TRUNCATED : RTFILEACTION_OPENED;
284	break;
285
286	case RTFILE_O_CREATE:
287	Assert(fOpenMode & O_CREAT);
288	Assert(fOpenMode & O_EXCL);
289	fh = open(pszNativeFilename, fOpenMode, fMode);
290	iErr = errno;
291	if (fh >= 0)
292	*penmActionTaken = RTFILEACTION_CREATED;
293	else if (iErr == EEXIST)
294	*penmActionTaken = RTFILEACTION_ALREADY_EXISTS;
295	break;
296
297	case RTFILE_O_OPEN_CREATE:
298	case RTFILE_O_CREATE_REPLACE:
299	{
300	Assert(fOpenMode & O_CREAT);
301	Assert(!(fOpenMode & O_EXCL));
302	int iTries = 64;
303	while (iTries-- > 0)
304	{
305	/* Yield the CPU if we've raced too long. */
306	if (iTries < 4)
307	RTThreadSleep(2 - (iTries & 1));
308
309	/* Try exclusive creation first: */
310	fh = open(pszNativeFilename, fOpenMode \| O_EXCL, fMode);
311	iErr = errno;
312	if (fh >= 0)
313	{
314	*penmActionTaken = RTFILEACTION_CREATED;
315	break;
316	}
317	if (iErr != EEXIST)
318	break;
319
320	/* If the file exists, try open it: */
321	fh = open(pszNativeFilename, fOpenMode & ~O_CREAT, fMode);
322	iErr = errno;
323	if (fh >= 0)
324	{
325	if ((fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE)
326	*penmActionTaken = fOpenMode & O_TRUNC ? RTFILEACTION_TRUNCATED : RTFILEACTION_OPENED;
327	else
328	*penmActionTaken = RTFILEACTION_REPLACED;
329	break;
330	}
331	if (iErr != ENOENT)
332	break;
333	}
334	Assert(iTries >= 0);
335	if (iTries < 0)
336	{
337	/* Thanks for the race, but we need to get on with things. */
338	fh = open(pszNativeFilename, fOpenMode, fMode);
339	iErr = errno;
340	if (fh >= 0)
341	*penmActionTaken = RTFILEACTION_OPENED;
342	}
343	break;
344	}
345
346	default:
347	AssertMsgFailed(("fOpen=%#llx fOpenMode=%#x\n", fOpen, fOpenMode));
348	iErr = EINVAL;
349	fh = -1;
350	break;
351	}
352	}
353
354	/*
355	* If temporary file, delete it.
356	*/
357	if ( fh >= 0
358	&& (fOpen & RTFILE_O_TEMP_AUTO_DELETE))
359	{
360	/** @todo Use funlinkat/funlink or similar here when available! Or better,
361	* use O_TMPFILE, only that may require fallback as not supported by
362	* all file system on linux. */
363	iErr = unlink(pszNativeFilename);
364	Assert(iErr == 0);
365	}
366
367	rtPathFreeNative(pszNativeFilename, pszFilename);
368	if (fh >= 0)
369	{
370	iErr = 0;
371
372	/*
373	* Mark the file handle close on exec, unless inherit is specified.
374	*/
375	if ( !(fOpen & RTFILE_O_INHERIT)
376	#ifdef O_NOINHERIT
377	&& !(fOpenMode & O_NOINHERIT) /* Take care since it might be a zero value dummy. */
378	#endif
379	#ifdef O_CLOEXEC
380	&& fHave_O_CLOEXEC <= 0
381	#endif
382	)
383	iErr = fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0 ? 0 : errno;
384
385	/*
386	* Switch direct I/O on now if requested and required.
387	*/
388	#if defined(RT_OS_DARWIN) \
389	\|\| (defined(RT_OS_SOLARIS) && !defined(IN_GUEST))
390	if (iErr == 0 && (fOpen & RTFILE_O_NO_CACHE))
391	{
392	# if defined(RT_OS_DARWIN)
393	iErr = fcntl(fh, F_NOCACHE, 1) >= 0 ? 0 : errno;
394	# else
395	iErr = directio(fh, DIRECTIO_ON) >= 0 ? 0 : errno;
396	# endif
397	}
398	#endif
399
400	/*
401	* Implement / emulate file sharing.
402	*
403	* We need another mode which allows skipping this stuff completely
404	* and do things the UNIX way. So for the present this is just a debug
405	* aid that can be enabled by developers too lazy to test on Windows.
406	*/
407	#if 0 && defined(RT_OS_LINUX)
408	if (iErr == 0)
409	{
410	/* This approach doesn't work because only knfsd checks for these
411	buggers. :-( */
412	int iLockOp;
413	switch (fOpen & RTFILE_O_DENY_MASK)
414	{
415	default:
416	AssertFailed();
417	case RTFILE_O_DENY_NONE:
418	case RTFILE_O_DENY_NOT_DELETE:
419	iLockOp = LOCK_MAND \| LOCK_READ \| LOCK_WRITE;
420	break;
421	case RTFILE_O_DENY_READ:
422	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
423	iLockOp = LOCK_MAND \| LOCK_WRITE;
424	break;
425	case RTFILE_O_DENY_WRITE:
426	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
427	iLockOp = LOCK_MAND \| LOCK_READ;
428	break;
429	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
430	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
431	iLockOp = LOCK_MAND;
432	break;
433	}
434	iErr = flock(fh, iLockOp \| LOCK_NB);
435	if (iErr != 0)
436	iErr = errno == EAGAIN ? ETXTBSY : 0;
437	}
438	#endif /* 0 && RT_OS_LINUX */
439	#if defined(DEBUG_bird) && !defined(RT_OS_SOLARIS)
440	if (iErr == 0)
441	{
442	/* This emulation is incomplete but useful. */
443	switch (fOpen & RTFILE_O_DENY_MASK)
444	{
445	default:
446	AssertFailed();
447	case RTFILE_O_DENY_NONE:
448	case RTFILE_O_DENY_NOT_DELETE:
449	case RTFILE_O_DENY_READ:
450	case RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
451	break;
452	case RTFILE_O_DENY_WRITE:
453	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_NOT_DELETE:
454	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ:
455	case RTFILE_O_DENY_WRITE \| RTFILE_O_DENY_READ \| RTFILE_O_DENY_NOT_DELETE:
456	if (fOpen & RTFILE_O_WRITE)
457	{
458	iErr = flock(fh, LOCK_EX \| LOCK_NB);
459	if (iErr != 0)
460	iErr = errno == EAGAIN ? ETXTBSY : 0;
461	}
462	break;
463	}
464	}
465	#endif
466	#ifdef RT_OS_SOLARIS
467	/** @todo Use fshare_t and associates, it's a perfect match. see sys/fcntl.h */
468	#endif
469
470	/*
471	* We're done.
472	*/
473	if (iErr == 0)
474	{
475	*phFile = (RTFILE)(uintptr_t)fh;
476	Assert((intptr_t)*phFile == fh);
477	LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#llx): returns %Rrc\n",
478	phFile, *phFile, pszFilename, pszFilename, fOpen, rc));
479	return VINF_SUCCESS;
480	}
481
482	close(fh);
483	}
484	return RTErrConvertFromErrno(iErr);
485	}
486
487
488	RTR3DECL(int) RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
489	{
490	AssertReturn( fAccess == RTFILE_O_READ
491	\|\| fAccess == RTFILE_O_WRITE
492	\|\| fAccess == RTFILE_O_READWRITE,
493	VERR_INVALID_PARAMETER);
494	return RTFileOpen(phFile, "/dev/null", fAccess \| RTFILE_O_DENY_NONE \| RTFILE_O_OPEN);
495	}
496
497
498	RTR3DECL(int) RTFileClose(RTFILE hFile)
499	{
500	if (hFile == NIL_RTFILE)
501	return VINF_SUCCESS;
502	if (close(RTFileToNative(hFile)) == 0)
503	return VINF_SUCCESS;
504	return RTErrConvertFromErrno(errno);
505	}
506
507
508	RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
509	{
510	AssertCompile(sizeof(uNative) == sizeof(*pFile));
511	if (uNative < 0)
512	{
513	AssertMsgFailed(("%p\n", uNative));
514	*pFile = NIL_RTFILE;
515	return VERR_INVALID_HANDLE;
516	}
517	*pFile = (RTFILE)uNative;
518	return VINF_SUCCESS;
519	}
520
521
522	RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
523	{
524	AssertReturn(hFile != NIL_RTFILE, -1);
525	return (intptr_t)hFile;
526	}
527
528
529	RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
530	{
531	int fd;
532	switch (enmStdHandle)
533	{
534	case RTHANDLESTD_INPUT: fd = 0; break;
535	case RTHANDLESTD_OUTPUT: fd = 1; break;
536	case RTHANDLESTD_ERROR: fd = 2; break;
537	default:
538	AssertFailedReturn(NIL_RTFILE);
539	}
540
541	struct stat st;
542	int rc = fstat(fd, &st);
543	if (rc == -1)
544	return NIL_RTFILE;
545	return (RTFILE)(intptr_t)fd;
546	}
547
548
549	RTR3DECL(int) RTFileDelete(const char *pszFilename)
550	{
551	char const *pszNativeFilename;
552	int rc = rtPathToNative(&pszNativeFilename, pszFilename, NULL);
553	if (RT_SUCCESS(rc))
554	{
555	if (unlink(pszNativeFilename) != 0)
556	rc = RTErrConvertFromErrno(errno);
557	rtPathFreeNative(pszNativeFilename, pszFilename);
558	}
559	return rc;
560	}
561
562
563	RTR3DECL(int) RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
564	{
565	static const unsigned aSeekRecode[] =
566	{
567	SEEK_SET,
568	SEEK_CUR,
569	SEEK_END,
570	};
571
572	/*
573	* Validate input.
574	*/
575	if (uMethod > RTFILE_SEEK_END)
576	{
577	AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
578	return VERR_INVALID_PARAMETER;
579	}
580
581	/* check that within off_t range. */
582	if ( sizeof(off_t) < sizeof(offSeek)
583	&& ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
584	\|\| (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
585	{
586	AssertMsgFailed(("64-bit search not supported\n"));
587	return VERR_NOT_SUPPORTED;
588	}
589
590	off_t offCurrent = lseek(RTFileToNative(hFile), (off_t)offSeek, aSeekRecode[uMethod]);
591	if (offCurrent != ~0)
592	{
593	if (poffActual)
594	*poffActual = (uint64_t)offCurrent;
595	return VINF_SUCCESS;
596	}
597	return RTErrConvertFromErrno(errno);
598	}
599
600
601	RTR3DECL(int) RTFileRead(RTFILE hFile, void pvBuf, size_t cbToRead, size_t pcbRead)
602	{
603	if (cbToRead <= 0)
604	{
605	if (pcbRead)
606	*pcbRead = 0;
607	return VINF_SUCCESS;
608	}
609
610	/*
611	* Attempt read.
612	*/
613	ssize_t cbRead = read(RTFileToNative(hFile), pvBuf, cbToRead);
614	if (cbRead >= 0)
615	{
616	if (pcbRead)
617	/* caller can handle partial read. */
618	*pcbRead = cbRead;
619	else
620	{
621	/* Caller expects all to be read. */
622	while ((ssize_t)cbToRead > cbRead)
623	{
624	ssize_t cbReadPart = read(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead);
625	if (cbReadPart <= 0)
626	{
627	if (cbReadPart == 0)
628	return VERR_EOF;
629	return RTErrConvertFromErrno(errno);
630	}
631	cbRead += cbReadPart;
632	}
633	}
634	return VINF_SUCCESS;
635	}
636
637	return RTErrConvertFromErrno(errno);
638	}
639
640
641	RTR3DECL(int) RTFileWrite(RTFILE hFile, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
642	{
643	if (cbToWrite <= 0)
644	return VINF_SUCCESS;
645
646	/*
647	* Attempt write.
648	*/
649	ssize_t cbWritten = write(RTFileToNative(hFile), pvBuf, cbToWrite);
650	if (cbWritten >= 0)
651	{
652	if (pcbWritten)
653	/* caller can handle partial write. */
654	*pcbWritten = cbWritten;
655	else
656	{
657	/* Caller expects all to be write. */
658	while ((ssize_t)cbToWrite > cbWritten)
659	{
660	ssize_t cbWrittenPart = write(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
661	if (cbWrittenPart <= 0)
662	return cbWrittenPart < 0 ? RTErrConvertFromErrno(errno) : VERR_TRY_AGAIN;
663	cbWritten += cbWrittenPart;
664	}
665	}
666	return VINF_SUCCESS;
667	}
668	return RTErrConvertFromErrno(errno);
669	}
670
671
672	RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
673	{
674	/*
675	* Validate offset.
676	*/
677	if ( sizeof(off_t) < sizeof(cbSize)
678	&& (cbSize >> 32) != 0)
679	{
680	AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
681	return VERR_NOT_SUPPORTED;
682	}
683
684	#if defined(_MSC_VER) \|\| (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) \|\| __INNOTEK_LIBC__ < 0x006))
685	if (chsize(RTFileToNative(hFile), (off_t)cbSize) == 0)
686	#else
687	/* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
688	* LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
689	* than the file.)
690	*/
691	if (ftruncate(RTFileToNative(hFile), (off_t)cbSize) == 0)
692	#endif
693	return VINF_SUCCESS;
694	return RTErrConvertFromErrno(errno);
695	}
696
697
698	RTR3DECL(int) RTFileQuerySize(RTFILE hFile, uint64_t *pcbSize)
699	{
700	/*
701	* Ask fstat() first.
702	*/
703	struct stat st;
704	if (!fstat(RTFileToNative(hFile), &st))
705	{
706	*pcbSize = st.st_size;
707	if ( st.st_size != 0
708	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_DARWIN)
709	\|\| (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
710	#elif defined(RT_OS_FREEBSD) \|\| defined(RT_OS_NETBSD) \|\| defined(RT_OS_DARWIN)
711	\|\| !S_ISCHR(st.st_mode)
712	#else
713	\|\| !S_ISBLK(st.st_mode)
714	#endif
715	)
716	return VINF_SUCCESS;
717
718	/*
719	* It could be a block device. Try determin the size by I/O control
720	* query or seek.
721	*/
722	#ifdef RT_OS_DARWIN
723	uint64_t cBlocks;
724	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKCOUNT, &cBlocks))
725	{
726	uint32_t cbBlock;
727	if (!ioctl(RTFileToNative(hFile), DKIOCGETBLOCKSIZE, &cbBlock))
728	{
729	pcbSize = cBlocks cbBlock;
730	return VINF_SUCCESS;
731	}
732	}
733
734	/* Always fail block devices. Character devices doesn't all need to be
735	/dev/rdisk* nodes, they should return ENOTTY but /dev/null returns ENODEV
736	and we include EINVAL just in case. */
737	if (!S_ISBLK(st.st_mode) && (errno == ENOTTY \|\| errno == ENODEV \|\| errno == EINVAL))
738	return VINF_SUCCESS;
739
740	#elif defined(RT_OS_SOLARIS)
741	struct dk_minfo MediaInfo;
742	if (!ioctl(RTFileToNative(hFile), DKIOCGMEDIAINFO, &MediaInfo))
743	{
744	pcbSize = MediaInfo.dki_capacity MediaInfo.dki_lbsize;
745	return VINF_SUCCESS;
746	}
747	/* might not be a block device. */
748	if (errno == EINVAL \|\| errno == ENOTTY)
749	return VINF_SUCCESS;
750
751	#elif defined(RT_OS_FREEBSD)
752	off_t cbMedia = 0;
753	if (!ioctl(RTFileToNative(hFile), DIOCGMEDIASIZE, &cbMedia))
754	{
755	*pcbSize = cbMedia;
756	return VINF_SUCCESS;
757	}
758	/* might not be a block device. */
759	if (errno == EINVAL \|\| errno == ENOTTY)
760	return VINF_SUCCESS;
761
762	#else
763	/* PORTME! Avoid this path when possible. */
764	uint64_t offSaved = UINT64_MAX;
765	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offSaved);
766	if (RT_SUCCESS(rc))
767	{
768	rc = RTFileSeek(hFile, 0, RTFILE_SEEK_END, pcbSize);
769	int rc2 = RTFileSeek(hFile, offSaved, RTFILE_SEEK_BEGIN, NULL);
770	if (RT_SUCCESS(rc))
771	return rc2;
772	}
773	#endif
774	}
775	return RTErrConvertFromErrno(errno);
776	}
777
778
779	RTR3DECL(int) RTFileQueryMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
780	{
781	/*
782	* Save the current location
783	*/
784	uint64_t offOld = UINT64_MAX;
785	int rc = RTFileSeek(hFile, 0, RTFILE_SEEK_CURRENT, &offOld);
786	if (RT_FAILURE(rc))
787	return rc;
788
789	uint64_t offLow = 0;
790	uint64_t offHigh = INT64_MAX; /* we don't need bigger files */
791	/** @todo Unfortunately this does not work for certain file system types,
792	* for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
793	* file systems. */
794
795	/*
796	* Quickly guess the order of magnitude for offHigh and offLow.
797	*/
798	{
799	uint64_t offHighPrev = offHigh;
800	while (offHigh >= INT32_MAX)
801	{
802	rc = RTFileSeek(hFile, offHigh, RTFILE_SEEK_BEGIN, NULL);
803	if (RT_SUCCESS(rc))
804	{
805	offLow = offHigh;
806	offHigh = offHighPrev;
807	break;
808	}
809	else
810	{
811	offHighPrev = offHigh;
812	offHigh >>= 8;
813	}
814	}
815	}
816
817	/*
818	* Sanity: if the seek to the initial offHigh (INT64_MAX) works, then
819	* this algorithm cannot possibly work. Declare defeat.
820	*/
821	if (offLow == offHigh)
822	{
823	rc = RTFileSeek(hFile, offOld, RTFILE_SEEK_BEGIN, NULL);
824	if (RT_SUCCESS(rc))
825	rc = VERR_NOT_IMPLEMENTED;
826
827	return rc;
828	}
829
830	/*
831	* Perform a binary search for the max file size.
832	*/
833	while (offLow <= offHigh)
834	{
835	uint64_t offMid = offLow + (offHigh - offLow) / 2;
836	rc = RTFileSeek(hFile, offMid, RTFILE_SEEK_BEGIN, NULL);
837	if (RT_FAILURE(rc))
838	offHigh = offMid - 1;
839	else
840	offLow = offMid + 1;
841	}
842
843	if (pcbMax)
844	*pcbMax = RT_MIN(offLow, offHigh);
845	return RTFileSeek(hFile, offOld, RTFILE_SEEK_BEGIN, NULL);
846	}
847
848
849	RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
850	{
851	if (hFile != NIL_RTFILE)
852	{
853	int fFlags = fcntl(RTFileToNative(hFile), F_GETFD);
854	if (fFlags >= 0)
855	return true;
856	}
857	return false;
858	}
859
860
861	RTR3DECL(int) RTFileFlush(RTFILE hFile)
862	{
863	if (!fsync(RTFileToNative(hFile)))
864	return VINF_SUCCESS;
865	/* Ignore EINVAL here as that's what returned for pseudo ttys
866	and other odd handles. */
867	if (errno == EINVAL)
868	return VINF_NOT_SUPPORTED;
869	return RTErrConvertFromErrno(errno);
870	}
871
872
873	RTR3DECL(int) RTFileIoCtl(RTFILE hFile, unsigned long ulRequest, void pvData, unsigned cbData, int piRet)
874	{
875	NOREF(cbData);
876	int rc = ioctl(RTFileToNative(hFile), ulRequest, pvData);
877	if (piRet)
878	*piRet = rc;
879	return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
880	}
881
882
883	RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
884	{
885	/*
886	* Normalize the mode and call the API.
887	*/
888	fMode = rtFsModeNormalize(fMode, NULL, 0, RTFS_TYPE_FILE);
889	if (!rtFsModeIsValid(fMode))
890	return VERR_INVALID_PARAMETER;
891
892	if (fchmod(RTFileToNative(hFile), fMode & RTFS_UNIX_MASK))
893	{
894	int rc = RTErrConvertFromErrno(errno);
895	Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", hFile, fMode, rc));
896	return rc;
897	}
898	return VINF_SUCCESS;
899	}
900
901
902	RTDECL(int) RTFileSetOwner(RTFILE hFile, uint32_t uid, uint32_t gid)
903	{
904	uid_t uidNative = uid != NIL_RTUID ? (uid_t)uid : (uid_t)-1;
905	AssertReturn(uid == uidNative, VERR_INVALID_PARAMETER);
906	gid_t gidNative = gid != NIL_RTGID ? (gid_t)gid : (gid_t)-1;
907	AssertReturn(gid == gidNative, VERR_INVALID_PARAMETER);
908
909	if (fchown(RTFileToNative(hFile), uidNative, gidNative))
910	return RTErrConvertFromErrno(errno);
911	return VINF_SUCCESS;
912	}
913
914
915	RTR3DECL(int) RTFileRename(const char pszSrc, const char pszDst, unsigned fRename)
916	{
917	/*
918	* Validate input.
919	*/
920	AssertPtrReturn(pszSrc, VERR_INVALID_POINTER);
921	AssertPtrReturn(pszDst, VERR_INVALID_POINTER);
922	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
923	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
924	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
925
926	/*
927	* Take common cause with RTPathRename.
928	*/
929	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
930
931	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
932	pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
933	return rc;
934	}
935

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

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