VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-posix.cpp@ 18587

Last change on this file since 18587 was 16647, checked in by vboxsync, 16 years ago

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1/* $Id: fileio-posix.cpp 16647 2009-02-10 16:56:50Z vboxsync $ */
2/** @file
3 * IPRT - File I/O, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 *
26 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27 * Clara, CA 95054 USA or visit http://www.sun.com if you need
28 * additional information or have any questions.
29 */
30
31
32/*******************************************************************************
33* Header Files *
34*******************************************************************************/
35#define LOG_GROUP RTLOGGROUP_FILE
36
37#include <errno.h>
38#include <sys/stat.h>
39#include <sys/types.h>
40#include <sys/ioctl.h>
41#include <sys/fcntl.h>
42#include <fcntl.h>
43#ifdef _MSC_VER
44# include <io.h>
45# include <stdio.h>
46#else
47# include <unistd.h>
48# include <sys/time.h>
49#endif
50#if defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) || __INNOTEK_LIBC__ < 0x006)
51# include <io.h>
52#endif
53#ifdef RT_OS_L4
54/* This is currently ifdef'ed out in the relevant L4 header file */
55/* Same as `utimes', but takes an open file descriptor instead of a name. */
56extern int futimes(int __fd, __const struct timeval __tvp[2]) __THROW;
57#endif
58
59#ifdef RT_OS_SOLARIS
60# define futimes(filedes, timeval) futimesat(filedes, NULL, timeval)
61#endif
62
63#include <iprt/file.h>
64#include <iprt/path.h>
65#include <iprt/assert.h>
66#include <iprt/string.h>
67#include <iprt/err.h>
68#include <iprt/log.h>
69#include "internal/file.h"
70#include "internal/fs.h"
71#include "internal/path.h"
72
73
74
75/*******************************************************************************
76* Defined Constants And Macros *
77*******************************************************************************/
78/** @def RT_DONT_CONVERT_FILENAMES
79 * Define this to pass UTF-8 unconverted to the kernel. */
80#ifdef __DOXYGEN__
81#define RT_DONT_CONVERT_FILENAMES 1
82#endif
83
84/** Default file permissions for newly created files. */
85#if defined(S_IRUSR) && defined(S_IWUSR)
86# define RT_FILE_PERMISSION (S_IRUSR | S_IWUSR)
87#else
88# define RT_FILE_PERMISSION (00600)
89#endif
90
91
92RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, unsigned fOpen)
93{
94 /*
95 * Validate input.
96 */
97 if (!VALID_PTR(pFile))
98 {
99 AssertMsgFailed(("Invalid pFile %p\n", pFile));
100 return VERR_INVALID_PARAMETER;
101 }
102 *pFile = NIL_RTFILE;
103 if (!VALID_PTR(pszFilename))
104 {
105 AssertMsgFailed(("Invalid pszFilename %p\n", pszFilename));
106 return VERR_INVALID_PARAMETER;
107 }
108
109 /*
110 * Merge forced open flags and validate them.
111 */
112 int rc = rtFileRecalcAndValidateFlags(&fOpen);
113 if (RT_FAILURE(rc))
114 return rc;
115#ifndef O_NONBLOCK
116 if (fOpen & RTFILE_O_NON_BLOCK)
117 {
118 AssertMsgFailed(("Invalid parameters! fOpen=%#x\n", fOpen));
119 return VERR_INVALID_PARAMETER;
120 }
121#endif
122
123 /*
124 * Calculate open mode flags.
125 */
126 int fOpenMode = 0;
127#ifdef O_BINARY
128 fOpenMode |= O_BINARY; /* (pc) */
129#endif
130#ifdef O_LARGEFILE
131 fOpenMode |= O_LARGEFILE; /* (linux) */
132#endif
133#ifdef O_NOINHERIT
134 if (!(fOpen & RTFILE_O_INHERIT))
135 fOpenMode |= O_NOINHERIT;
136#endif
137#ifdef O_NONBLOCK
138 if (fOpen & RTFILE_O_NON_BLOCK)
139 fOpenMode |= O_NONBLOCK;
140#endif
141#ifdef O_SYNC
142 if (fOpen & RTFILE_O_WRITE_THROUGH)
143 fOpenMode |= O_SYNC;
144#endif
145
146 /* create/truncate file */
147 switch (fOpen & RTFILE_O_ACTION_MASK)
148 {
149 case RTFILE_O_OPEN: break;
150 case RTFILE_O_OPEN_CREATE: fOpenMode |= O_CREAT; break;
151 case RTFILE_O_CREATE: fOpenMode |= O_CREAT | O_EXCL; break;
152 case RTFILE_O_CREATE_REPLACE: fOpenMode |= O_CREAT | O_TRUNC; break; /** @todo replacing needs fixing, this is *not* a 1:1 mapping! */
153 }
154 if (fOpen & RTFILE_O_TRUNCATE)
155 fOpenMode |= O_TRUNC;
156
157 switch (fOpen & RTFILE_O_ACCESS_MASK)
158 {
159 case RTFILE_O_READ: fOpenMode |= O_RDONLY; break;
160 case RTFILE_O_WRITE: fOpenMode |= O_WRONLY; break;
161 case RTFILE_O_READWRITE: fOpenMode |= O_RDWR; break;
162 default:
163 AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#x\n", fOpen));
164 return VERR_INVALID_PARAMETER;
165 }
166
167 /* File mode. */
168 int fMode = (fOpen & RTFILE_O_CREATE_MODE_MASK)
169 ? (fOpen & RTFILE_O_CREATE_MODE_MASK) >> RTFILE_O_CREATE_MODE_SHIFT
170 : RT_FILE_PERMISSION;
171
172 /** @todo sharing! */
173
174 /*
175 * Open/create the file.
176 */
177#ifdef RT_DONT_CONVERT_FILENAMES
178 int fh = open(pszFilename, fOpenMode, fMode);
179 int iErr = errno;
180#else
181 char *pszNativeFilename;
182 rc = rtPathToNative(&pszNativeFilename, pszFilename);
183 if (RT_FAILURE(rc))
184 return (rc);
185
186 int fh = open(pszNativeFilename, fOpenMode, fMode);
187 int iErr = errno;
188 rtPathFreeNative(pszNativeFilename);
189#endif
190 if (fh >= 0)
191 {
192 /*
193 * Mark the file handle close on exec, unless inherit is specified.
194 */
195 if ( !(fOpen & RTFILE_O_INHERIT)
196#ifdef O_NOINHERIT
197 || (fOpenMode & O_NOINHERIT) /* careful since it could be a dummy. */
198#endif
199 || fcntl(fh, F_SETFD, FD_CLOEXEC) >= 0)
200 {
201 *pFile = (RTFILE)fh;
202 Assert((int)*pFile == fh);
203 LogFlow(("RTFileOpen(%p:{%RTfile}, %p:{%s}, %#x): returns %Rrc\n",
204 pFile, *pFile, pszFilename, pszFilename, fOpen, rc));
205 return VINF_SUCCESS;
206 }
207 iErr = errno;
208 close(fh);
209 }
210 return RTErrConvertFromErrno(iErr);
211}
212
213
214RTR3DECL(int) RTFileClose(RTFILE File)
215{
216 if (close((int)File) == 0)
217 return VINF_SUCCESS;
218 return RTErrConvertFromErrno(errno);
219}
220
221
222RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
223{
224 if ( uNative < 0
225 || (RTFILE)uNative != (RTUINTPTR)uNative)
226 {
227 AssertMsgFailed(("%p\n", uNative));
228 *pFile = NIL_RTFILE;
229 return VERR_INVALID_HANDLE;
230 }
231 *pFile = (RTFILE)uNative;
232 return VINF_SUCCESS;
233}
234
235
236RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE File)
237{
238 AssertReturn(File != NIL_RTFILE, -1);
239 return (RTHCINTPTR)File;
240}
241
242
243RTR3DECL(int) RTFileDelete(const char *pszFilename)
244{
245 char *pszNativeFilename;
246 int rc = rtPathToNative(&pszNativeFilename, pszFilename);
247 if (RT_SUCCESS(rc))
248 {
249 if (unlink(pszNativeFilename) != 0)
250 rc = RTErrConvertFromErrno(errno);
251 rtPathFreeNative(pszNativeFilename);
252 }
253 return rc;
254}
255
256
257RTR3DECL(int) RTFileSeek(RTFILE File, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
258{
259 static const unsigned aSeekRecode[] =
260 {
261 SEEK_SET,
262 SEEK_CUR,
263 SEEK_END,
264 };
265
266 /*
267 * Validate input.
268 */
269 if (uMethod > RTFILE_SEEK_END)
270 {
271 AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
272 return VERR_INVALID_PARAMETER;
273 }
274
275 /* check that within off_t range. */
276 if ( sizeof(off_t) < sizeof(offSeek)
277 && ( (offSeek > 0 && (unsigned)(offSeek >> 32) != 0)
278 || (offSeek < 0 && (unsigned)(-offSeek >> 32) != 0)))
279 {
280 AssertMsgFailed(("64-bit search not supported\n"));
281 return VERR_NOT_SUPPORTED;
282 }
283
284 off_t offCurrent = lseek((int)File, (off_t)offSeek, aSeekRecode[uMethod]);
285 if (offCurrent != ~0)
286 {
287 if (poffActual)
288 *poffActual = (uint64_t)offCurrent;
289 return VINF_SUCCESS;
290 }
291 return RTErrConvertFromErrno(errno);
292}
293
294
295RTR3DECL(int) RTFileRead(RTFILE File, void *pvBuf, size_t cbToRead, size_t *pcbRead)
296{
297 if (cbToRead <= 0)
298 return VINF_SUCCESS;
299
300 /*
301 * Attempt read.
302 */
303 ssize_t cbRead = read((int)File, pvBuf, cbToRead);
304 if (cbRead >= 0)
305 {
306 if (pcbRead)
307 /* caller can handle partial read. */
308 *pcbRead = cbRead;
309 else
310 {
311 /* Caller expects all to be read. */
312 while ((ssize_t)cbToRead > cbRead)
313 {
314 ssize_t cbReadPart = read((int)File, (char*)pvBuf + cbRead, cbToRead - cbRead);
315 if (cbReadPart <= 0)
316 {
317 if (cbReadPart == 0)
318 return VERR_EOF;
319 return RTErrConvertFromErrno(errno);
320 }
321 cbRead += cbReadPart;
322 }
323 }
324 return VINF_SUCCESS;
325 }
326
327 return RTErrConvertFromErrno(errno);
328}
329
330
331RTR3DECL(int) RTFileWrite(RTFILE File, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
332{
333 if (cbToWrite <= 0)
334 return VINF_SUCCESS;
335
336 /*
337 * Attempt write.
338 */
339 ssize_t cbWritten = write((int)File, pvBuf, cbToWrite);
340 if (cbWritten >= 0)
341 {
342 if (pcbWritten)
343 /* caller can handle partial write. */
344 *pcbWritten = cbWritten;
345 else
346 {
347 /* Caller expects all to be write. */
348 while ((ssize_t)cbToWrite > cbWritten)
349 {
350 ssize_t cbWrittenPart = write((int)File, (const char *)pvBuf + cbWritten, cbToWrite - cbWritten);
351 if (cbWrittenPart <= 0)
352 return RTErrConvertFromErrno(errno);
353 cbWritten += cbWrittenPart;
354 }
355 }
356 return VINF_SUCCESS;
357 }
358 return RTErrConvertFromErrno(errno);
359}
360
361
362RTR3DECL(int) RTFileSetSize(RTFILE File, uint64_t cbSize)
363{
364 /*
365 * Validate offset.
366 */
367 if ( sizeof(off_t) < sizeof(cbSize)
368 && (cbSize >> 32) != 0)
369 {
370 AssertMsgFailed(("64-bit filesize not supported! cbSize=%lld\n", cbSize));
371 return VERR_NOT_SUPPORTED;
372 }
373
374#if defined(_MSC_VER) || (defined(RT_OS_OS2) && (!defined(__INNOTEK_LIBC__) || __INNOTEK_LIBC__ < 0x006))
375 if (chsize((int)File, (off_t)cbSize) == 0)
376#else
377 /* This relies on a non-standard feature of FreeBSD, Linux, and OS/2
378 * LIBC v0.6 and higher. (SuS doesn't define ftruncate() and size bigger
379 * than the file.)
380 */
381 if (ftruncate((int)File, (off_t)cbSize) == 0)
382#endif
383 return VINF_SUCCESS;
384 return RTErrConvertFromErrno(errno);
385}
386
387
388RTR3DECL(int) RTFileGetSize(RTFILE File, uint64_t *pcbSize)
389{
390 struct stat st;
391 if (!fstat((int)File, &st))
392 {
393 *pcbSize = st.st_size;
394 return VINF_SUCCESS;
395 }
396 return RTErrConvertFromErrno(errno);
397}
398
399
400/**
401 * Determine the maximum file size.
402 *
403 * @returns IPRT status code.
404 * @param File Handle to the file.
405 * @param pcbMax Where to store the max file size.
406 * @see RTFileGetMaxSize.
407 */
408RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
409{
410 /*
411 * Save the current location
412 */
413 uint64_t offOld;
414 int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &offOld);
415 if (RT_FAILURE(rc))
416 return rc;
417
418 /*
419 * Perform a binary search for the max file size.
420 */
421 uint64_t offLow = 0;
422 uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
423 /** @todo Unfortunately this does not work for certain file system types,
424 * for instance cifs mounts. Even worse, statvfs.f_fsid returns 0 for such
425 * file systems. */
426 //uint64_t offHigh = INT64_MAX;
427 for (;;)
428 {
429 uint64_t cbInterval = (offHigh - offLow) >> 1;
430 if (cbInterval == 0)
431 {
432 if (pcbMax)
433 *pcbMax = offLow;
434 return RTFileSeek(File, offOld, RTFILE_SEEK_BEGIN, NULL);
435 }
436
437 rc = RTFileSeek(File, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
438 if (RT_FAILURE(rc))
439 offHigh = offLow + cbInterval;
440 else
441 offLow = offLow + cbInterval;
442 }
443}
444
445
446RTR3DECL(bool) RTFileIsValid(RTFILE File)
447{
448 if (File != NIL_RTFILE)
449 {
450 int fFlags = fcntl(File, F_GETFD);
451 if (fFlags >= 0)
452 return true;
453 }
454 return false;
455}
456
457
458RTR3DECL(int) RTFileFlush(RTFILE File)
459{
460 if (fsync((int)File))
461 return RTErrConvertFromErrno(errno);
462 return VINF_SUCCESS;
463}
464
465
466RTR3DECL(int) RTFileIoCtl(RTFILE File, int iRequest, void *pvData, unsigned cbData, int *piRet)
467{
468 int rc = ioctl((int)File, iRequest, pvData);
469 if (piRet)
470 *piRet = rc;
471 return rc >= 0 ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
472}
473
474
475RTR3DECL(int) RTFileQueryInfo(RTFILE File, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
476{
477 /*
478 * Validate input.
479 */
480 if (File == NIL_RTFILE)
481 {
482 AssertMsgFailed(("Invalid File=%RTfile\n", File));
483 return VERR_INVALID_PARAMETER;
484 }
485 if (!pObjInfo)
486 {
487 AssertMsgFailed(("Invalid pObjInfo=%p\n", pObjInfo));
488 return VERR_INVALID_PARAMETER;
489 }
490 if ( enmAdditionalAttribs < RTFSOBJATTRADD_NOTHING
491 || enmAdditionalAttribs > RTFSOBJATTRADD_LAST)
492 {
493 AssertMsgFailed(("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs));
494 return VERR_INVALID_PARAMETER;
495 }
496
497 /*
498 * Query file info.
499 */
500 struct stat Stat;
501 if (fstat((int)File, &Stat))
502 {
503 int rc = RTErrConvertFromErrno(errno);
504 Log(("RTFileQueryInfo(%RTfile,,%d): returns %Rrc\n", File, enmAdditionalAttribs, rc));
505 return rc;
506 }
507
508 /*
509 * Setup the returned data.
510 */
511 rtFsConvertStatToObjInfo(pObjInfo, &Stat, NULL, 0);
512
513 /*
514 * Requested attributes (we cannot provide anything actually).
515 */
516 switch (enmAdditionalAttribs)
517 {
518 case RTFSOBJATTRADD_EASIZE:
519 pObjInfo->Attr.enmAdditional = RTFSOBJATTRADD_EASIZE;
520 pObjInfo->Attr.u.EASize.cb = 0;
521 break;
522
523 case RTFSOBJATTRADD_NOTHING:
524 case RTFSOBJATTRADD_UNIX:
525 /* done */
526 break;
527
528 default:
529 AssertMsgFailed(("Impossible!\n"));
530 return VERR_INTERNAL_ERROR;
531 }
532
533 LogFlow(("RTFileQueryInfo(%RTfile,,%d): returns VINF_SUCCESS\n", File, enmAdditionalAttribs));
534 return VINF_SUCCESS;
535}
536
537
538RTR3DECL(int) RTFileSetTimes(RTFILE File, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
539 PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
540{
541 /*
542 * We can only set AccessTime and ModificationTime, so if neither
543 * are specified we can return immediately.
544 */
545 if (!pAccessTime && !pModificationTime)
546 return VINF_SUCCESS;
547
548 /*
549 * Convert the input to timeval, getting the missing one if necessary,
550 * and call the API which does the change.
551 */
552 struct timeval aTimevals[2];
553 if (pAccessTime && pModificationTime)
554 {
555 RTTimeSpecGetTimeval(pAccessTime, &aTimevals[0]);
556 RTTimeSpecGetTimeval(pModificationTime, &aTimevals[1]);
557 }
558 else
559 {
560 RTFSOBJINFO ObjInfo;
561 int rc = RTFileQueryInfo(File, &ObjInfo, RTFSOBJATTRADD_UNIX);
562 if (RT_FAILURE(rc))
563 return rc;
564 RTTimeSpecGetTimeval(pAccessTime ? pAccessTime : &ObjInfo.AccessTime, &aTimevals[0]);
565 RTTimeSpecGetTimeval(pModificationTime ? pModificationTime : &ObjInfo.ModificationTime, &aTimevals[1]);
566 }
567
568 if (futimes((int)File, aTimevals))
569 {
570 int rc = RTErrConvertFromErrno(errno);
571 Log(("RTFileSetTimes(%RTfile,%p,%p,,): returns %Rrc\n", File, pAccessTime, pModificationTime, rc));
572 return rc;
573 }
574 return VINF_SUCCESS;
575}
576
577
578RTR3DECL(int) RTFileSetMode(RTFILE File, RTFMODE fMode)
579{
580 /*
581 * Normalize the mode and call the API.
582 */
583 fMode = rtFsModeNormalize(fMode, NULL, 0);
584 if (!rtFsModeIsValid(fMode))
585 return VERR_INVALID_PARAMETER;
586
587 if (fchmod((int)File, fMode & RTFS_UNIX_MASK))
588 {
589 int rc = RTErrConvertFromErrno(errno);
590 Log(("RTFileSetMode(%RTfile,%RTfmode): returns %Rrc\n", File, fMode, rc));
591 return rc;
592 }
593 return VINF_SUCCESS;
594}
595
596
597RTR3DECL(int) RTFileRename(const char *pszSrc, const char *pszDst, unsigned fRename)
598{
599 /*
600 * Validate input.
601 */
602 AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
603 AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
604 AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
605 AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
606 AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
607
608 /*
609 * Take common cause with RTPathRename.
610 */
611 int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_FILE);
612
613 LogFlow(("RTDirRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
614 pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
615 return rc;
616}
617
618
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