path-posix.cpp@ 34002

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1	/* $Id: path-posix.cpp 34002 2010-11-11 17:16:37Z vboxsync $ */
2	/** @file
3	* IPRT - Path Manipulation, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.215389.xyz. 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_PATH
32	#include <stdlib.h>
33	#include <limits.h>
34	#include <errno.h>
35	#include <unistd.h>
36	#include <sys/stat.h>
37	#include <sys/time.h>
38	#include <stdio.h>
39	#include <sys/types.h>
40	#include <pwd.h>
41	#include <grp.h>
42
43	#include <iprt/path.h>
44	#include <iprt/env.h>
45	#include <iprt/assert.h>
46	#include <iprt/string.h>
47	#include <iprt/err.h>
48	#include <iprt/log.h>
49	#include "internal/path.h"
50	#include "internal/process.h"
51	#include "internal/fs.h"
52
53	#ifdef RT_OS_L4
54	# include <l4/vboxserver/vboxserver.h>
55	#endif
56
57
58
59
60	RTDECL(int) RTPathReal(const char pszPath, char pszRealPath, size_t cchRealPath)
61	{
62	/*
63	* Convert input.
64	*/
65	char const *pszNativePath;
66	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
67	if (RT_SUCCESS(rc))
68	{
69	/*
70	* On POSIX platforms the API doesn't take a length parameter, which makes it
71	* a little bit more work.
72	*/
73	char szTmpPath[PATH_MAX + 1];
74	const char *psz = realpath(pszNativePath, szTmpPath);
75	if (psz)
76	rc = rtPathFromNativeCopy(pszRealPath, cchRealPath, szTmpPath, NULL);
77	else
78	rc = RTErrConvertFromErrno(errno);
79	rtPathFreeNative(pszNativePath, pszPath);
80	}
81
82	LogFlow(("RTPathReal(%p:{%s}, %p:{%s}, %u): returns %Rrc\n", pszPath, pszPath,
83	pszRealPath, RT_SUCCESS(rc) ? pszRealPath : "<failed>", cchRealPath));
84	return rc;
85	}
86
87
88	/**
89	* Cleans up a path specifier a little bit.
90	* This includes removing duplicate slashes, unnecessary single dots, and
91	* trailing slashes. Also, replaces all RTPATH_SLASH characters with '/'.
92	*
93	* @returns Number of bytes in the clean path.
94	* @param pszPath The path to cleanup.
95	*/
96	static int fsCleanPath(char *pszPath)
97	{
98	/*
99	* Change to '/' and remove duplicates.
100	*/
101	char *pszSrc = pszPath;
102	char *pszTrg = pszPath;
103	#ifdef HAVE_UNC
104	int fUnc = 0;
105	if ( RTPATH_IS_SLASH(pszPath[0])
106	&& RTPATH_IS_SLASH(pszPath[1]))
107	{ /* Skip first slash in a unc path. */
108	pszSrc++;
109	*pszTrg++ = '/';
110	fUnc = 1;
111	}
112	#endif
113
114	for (;;)
115	{
116	char ch = *pszSrc++;
117	if (RTPATH_IS_SLASH(ch))
118	{
119	*pszTrg++ = '/';
120	for (;;)
121	{
122	do ch = *pszSrc++;
123	while (RTPATH_IS_SLASH(ch));
124
125	/* Remove '/./' and '/.'. */
126	if (ch != '.' \|\| (pszSrc && !RTPATH_IS_SLASH(pszSrc)))
127	break;
128	}
129	}
130	*pszTrg = ch;
131	if (!ch)
132	break;
133	pszTrg++;
134	}
135
136	/*
137	* Remove trailing slash if the path may be pointing to a directory.
138	*/
139	int cch = pszTrg - pszPath;
140	if ( cch > 1
141	&& RTPATH_IS_SLASH(pszTrg[-1])
142	#ifdef HAVE_DRIVE
143	&& !RTPATH_IS_VOLSEP(pszTrg[-2])
144	#endif
145	&& !RTPATH_IS_SLASH(pszTrg[-2]))
146	pszPath[--cch] = '\0';
147
148	return cch;
149	}
150
151
152	RTDECL(int) RTPathAbs(const char pszPath, char pszAbsPath, size_t cchAbsPath)
153	{
154	int rc;
155
156	/*
157	* Validation.
158	*/
159	AssertPtr(pszAbsPath);
160	AssertPtr(pszPath);
161	if (RT_UNLIKELY(!*pszPath))
162	return VERR_INVALID_PARAMETER;
163
164	/*
165	* Make a clean working copy of the input.
166	*/
167	size_t cchPath = strlen(pszPath);
168	if (cchPath > PATH_MAX)
169	{
170	LogFlow(("RTPathAbs(%p:{%s}, %p, %d): returns %Rrc\n", pszPath, pszPath, pszAbsPath, cchAbsPath, VERR_FILENAME_TOO_LONG));
171	return VERR_FILENAME_TOO_LONG;
172	}
173
174	char szTmpPath[PATH_MAX + 1];
175	memcpy(szTmpPath, pszPath, cchPath + 1);
176	size_t cchTmpPath = fsCleanPath(szTmpPath);
177
178	/*
179	* Handle "." specially (fsCleanPath does).
180	*/
181	if (szTmpPath[0] == '.' && !szTmpPath[1])
182	return RTPathGetCurrent(pszAbsPath, cchAbsPath);
183
184	/*
185	* Do we have a root slash?
186	*/
187	char *pszCur = szTmpPath;
188	#ifdef HAVE_DRIVE
189	if (pszCur[0] && RTPATH_IS_VOLSEP(pszCur[1]) && pszCur[2] == '/')
190	pszCur += 3;
191	# ifdef HAVE_UNC
192	else if (pszCur[0] == '/' && pszCur[1] == '/')
193	pszCur += 2;
194	# endif
195	#else /* !HAVE_DRIVE */
196	if (pszCur[0] == '/')
197	pszCur += 1;
198	#endif /* !HAVE_DRIVE */
199	else
200	{
201	/*
202	* No, prepend the current directory to the relative path.
203	*/
204	char szCurDir[RTPATH_MAX];
205	rc = RTPathGetCurrent(szCurDir, sizeof(szCurDir));
206	AssertRCReturn(rc, rc);
207
208	size_t cchCurDir = fsCleanPath(szCurDir); /* paranoia */
209	if (cchCurDir + cchTmpPath + 1 > PATH_MAX)
210	{
211	LogFlow(("RTPathAbs(%p:{%s}, %p, %d): returns %Rrc\n", pszPath, pszPath, pszAbsPath, cchAbsPath, VERR_FILENAME_TOO_LONG));
212	return VERR_FILENAME_TOO_LONG;
213	}
214
215	memmove(szTmpPath + cchCurDir + 1, szTmpPath, cchTmpPath + 1);
216	memcpy(szTmpPath, szCurDir, cchCurDir);
217	szTmpPath[cchCurDir] = '/';
218
219
220	#ifdef HAVE_DRIVE
221	if (pszCur[0] && RTPATH_IS_VOLSEP(pszCur[1]) && pszCur[2] == '/')
222	pszCur += 3;
223	# ifdef HAVE_UNC
224	else if (pszCur[0] == '/' && pszCur[1] == '/')
225	pszCur += 2;
226	# endif
227	#else
228	if (pszCur[0] == '/')
229	pszCur += 1;
230	#endif
231	else
232	AssertMsgFailedReturn(("pszCur=%s\n", pszCur), VERR_INTERNAL_ERROR);
233	}
234
235	char *pszTop = pszCur;
236
237	/*
238	* Get rid of double dot path components by evaluating them.
239	*/
240	for (;;)
241	{
242	if ( pszCur[0] == '.'
243	&& pszCur[1] == '.'
244	&& (!pszCur[2] \|\| pszCur[2] == '/'))
245	{
246	/* rewind to the previous component if any */
247	char *pszPrev = pszCur - 1;
248	if (pszPrev > pszTop)
249	while (*--pszPrev != '/')
250	;
251
252	AssertMsg(*pszPrev == '/', ("szTmpPath={%s}, pszPrev=+%u\n", szTmpPath, pszPrev - szTmpPath));
253	memmove(pszPrev, pszCur + 2, strlen(pszCur + 2) + 1);
254
255	pszCur = pszPrev;
256	}
257	else
258	{
259	/* advance to end of component. */
260	while (pszCur && pszCur != '/')
261	pszCur++;
262	}
263
264	if (!*pszCur)
265	break;
266
267	/* skip the slash */
268	++pszCur;
269	}
270
271	if (pszCur < pszTop)
272	{
273	/*
274	* We overwrote the root slash with '\0', restore it.
275	*/
276	*pszCur++ = '/';
277	*pszCur = '\0';
278	}
279	else if (pszCur > pszTop && pszCur[-1] == '/')
280	{
281	/*
282	* Extra trailing slash in a non-root path, remove it.
283	* (A bit questionable...)
284	*/
285	*--pszCur = '\0';
286	}
287
288	/*
289	* Copy the result to the user buffer.
290	*/
291	cchTmpPath = pszCur - szTmpPath;
292	if (cchTmpPath < cchAbsPath)
293	{
294	memcpy(pszAbsPath, szTmpPath, cchTmpPath + 1);
295	rc = VINF_SUCCESS;
296	}
297	else
298	rc = VERR_BUFFER_OVERFLOW;
299
300	LogFlow(("RTPathAbs(%p:{%s}, %p:{%s}, %d): returns %Rrc\n", pszPath, pszPath, pszAbsPath,
301	RT_SUCCESS(rc) ? pszAbsPath : "<failed>", cchAbsPath, rc));
302	return rc;
303	}
304
305
306	RTR3DECL(int) RTPathQueryInfo(const char *pszPath, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
307	{
308	return RTPathQueryInfoEx(pszPath, pObjInfo, enmAdditionalAttribs, RTPATH_F_ON_LINK);
309	}
310
311
312	RTR3DECL(int) RTPathQueryInfoEx(const char *pszPath, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs, uint32_t fFlags)
313	{
314	/*
315	* Validate input.
316	*/
317	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
318	AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
319	AssertPtrReturn(pObjInfo, VERR_INVALID_POINTER);
320	AssertMsgReturn( enmAdditionalAttribs >= RTFSOBJATTRADD_NOTHING
321	&& enmAdditionalAttribs <= RTFSOBJATTRADD_LAST,
322	("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs),
323	VERR_INVALID_PARAMETER);
324	AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
325
326	/*
327	* Convert the filename.
328	*/
329	char const *pszNativePath;
330	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
331	if (RT_SUCCESS(rc))
332	{
333	struct stat Stat;
334	if (fFlags & RTPATH_F_FOLLOW_LINK)
335	rc = stat(pszNativePath, &Stat);
336	else
337	rc = lstat(pszNativePath, &Stat); /** @todo how doesn't have lstat again? */
338	if (!rc)
339	{
340	rtFsConvertStatToObjInfo(pObjInfo, &Stat, pszPath, 0);
341	switch (enmAdditionalAttribs)
342	{
343	case RTFSOBJATTRADD_NOTHING:
344	case RTFSOBJATTRADD_UNIX:
345	Assert(pObjInfo->Attr.enmAdditional == RTFSOBJATTRADD_UNIX);
346	break;
347
348	case RTFSOBJATTRADD_UNIX_OWNER:
349	rtFsObjInfoAttrSetUnixOwner(pObjInfo, Stat.st_uid);
350	break;
351
352	case RTFSOBJATTRADD_UNIX_GROUP:
353	rtFsObjInfoAttrSetUnixGroup(pObjInfo, Stat.st_gid);
354	break;
355
356	case RTFSOBJATTRADD_EASIZE:
357	/** @todo Use SGI extended attribute interface to query EA info. */
358	pObjInfo->Attr.enmAdditional = RTFSOBJATTRADD_EASIZE;
359	pObjInfo->Attr.u.EASize.cb = 0;
360	break;
361
362	default:
363	AssertMsgFailed(("Impossible!\n"));
364	return VERR_INTERNAL_ERROR;
365	}
366	}
367	else
368	rc = RTErrConvertFromErrno(errno);
369	rtPathFreeNative(pszNativePath, pszPath);
370	}
371
372	LogFlow(("RTPathQueryInfo(%p:{%s}, pObjInfo=%p, %d): returns %Rrc\n",
373	pszPath, pszPath, pObjInfo, enmAdditionalAttribs, rc));
374	return rc;
375	}
376
377
378	RTR3DECL(int) RTPathSetTimes(const char *pszPath, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
379	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
380	{
381	return RTPathSetTimesEx(pszPath, pAccessTime, pModificationTime, pChangeTime, pBirthTime, RTPATH_F_ON_LINK);
382	}
383
384
385	RTR3DECL(int) RTPathSetTimesEx(const char *pszPath, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
386	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime, uint32_t fFlags)
387	{
388	/*
389	* Validate input.
390	*/
391	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
392	AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
393	AssertPtrNullReturn(pAccessTime, VERR_INVALID_POINTER);
394	AssertPtrNullReturn(pModificationTime, VERR_INVALID_POINTER);
395	AssertPtrNullReturn(pChangeTime, VERR_INVALID_POINTER);
396	AssertPtrNullReturn(pBirthTime, VERR_INVALID_POINTER);
397	AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
398
399	/*
400	* Convert the paths.
401	*/
402	char const *pszNativePath;
403	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
404	if (RT_SUCCESS(rc))
405	{
406	RTFSOBJINFO ObjInfo;
407
408	/*
409	* If it's a no-op, we'll only verify the existance of the file.
410	*/
411	if (!pAccessTime && !pModificationTime)
412	rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_NOTHING, fFlags);
413	else
414	{
415	/*
416	* Convert the input to timeval, getting the missing one if necessary,
417	* and call the API which does the change.
418	*/
419	struct timeval aTimevals[2];
420	if (pAccessTime && pModificationTime)
421	{
422	RTTimeSpecGetTimeval(pAccessTime, &aTimevals[0]);
423	RTTimeSpecGetTimeval(pModificationTime, &aTimevals[1]);
424	}
425	else
426	{
427	rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX, fFlags);
428	if (RT_SUCCESS(rc))
429	{
430	RTTimeSpecGetTimeval(pAccessTime ? pAccessTime : &ObjInfo.AccessTime, &aTimevals[0]);
431	RTTimeSpecGetTimeval(pModificationTime ? pModificationTime : &ObjInfo.ModificationTime, &aTimevals[1]);
432	}
433	else
434	Log(("RTPathSetTimes('%s',%p,%p,,): RTPathQueryInfo failed with %Rrc\n",
435	pszPath, pAccessTime, pModificationTime, rc));
436	}
437	if (RT_SUCCESS(rc))
438	{
439	if (fFlags & RTPATH_F_FOLLOW_LINK)
440	{
441	if (utimes(pszNativePath, aTimevals))
442	rc = RTErrConvertFromErrno(errno);
443	}
444	#if (defined(RT_OS_DARWIN) && MAC_OS_X_VERSION_MIN_REQUIRED >= 1050) \
445	\|\| defined(RT_OS_FREEBSD) \
446	\|\| defined(RT_OS_LINUX) \
447	\|\| defined(RT_OS_OS2) /** @todo who really has lutimes? */
448	else
449	{
450	if (lutimes(pszNativePath, aTimevals))
451	rc = RTErrConvertFromErrno(errno);
452	}
453	#else
454	else
455	{
456	if (pAccessTime && pModificationTime)
457	rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX, fFlags);
458	if (RT_SUCCESS(rc) && RTFS_IS_SYMLINK(ObjInfo.Attr.fMode))
459	rc = VERR_NS_SYMLINK_SET_TIME;
460	else if (RT_SUCCESS(rc))
461	{
462	if (utimes(pszNativePath, aTimevals))
463	rc = RTErrConvertFromErrno(errno);
464	}
465	}
466	#endif
467	if (RT_FAILURE(rc))
468	Log(("RTPathSetTimes('%s',%p,%p,,): failed with %Rrc and errno=%d\n",
469	pszPath, pAccessTime, pModificationTime, rc, errno));
470	}
471	}
472	rtPathFreeNative(pszNativePath, pszPath);
473	}
474
475	LogFlow(("RTPathSetTimes(%p:{%s}, %p:{%RDtimespec}, %p:{%RDtimespec}, %p:{%RDtimespec}, %p:{%RDtimespec}): return %Rrc\n",
476	pszPath, pszPath, pAccessTime, pAccessTime, pModificationTime, pModificationTime,
477	pChangeTime, pChangeTime, pBirthTime, pBirthTime, rc));
478	return rc;
479	}
480
481
482	RTR3DECL(int) RTPathSetOwner(const char *pszPath, uint32_t uid, uint32_t gid)
483	{
484	return RTPathSetOwnerEx(pszPath, uid, gid, RTPATH_F_ON_LINK);
485	}
486
487
488	RTR3DECL(int) RTPathSetOwnerEx(const char *pszPath, uint32_t uid, uint32_t gid, uint32_t fFlags)
489	{
490	/*
491	* Validate input.
492	*/
493	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
494	AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
495	AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
496	uid_t uidNative = uid != UINT32_MAX ? (uid_t)uid : (uid_t)-1;
497	AssertReturn(uid == uidNative, VERR_INVALID_PARAMETER);
498	gid_t gidNative = gid != UINT32_MAX ? (gid_t)gid : (uid_t)-1;
499	AssertReturn(gid == gidNative, VERR_INVALID_PARAMETER);
500
501	/*
502	* Convert the path.
503	*/
504	char const *pszNativePath;
505	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
506	if (RT_SUCCESS(rc))
507	{
508	if (fFlags & RTPATH_F_FOLLOW_LINK)
509	{
510	if (chown(pszNativePath, uidNative, gidNative))
511	rc = RTErrConvertFromErrno(errno);
512	}
513	#if 1
514	else
515	{
516	if (lchown(pszNativePath, uidNative, gidNative))
517	rc = RTErrConvertFromErrno(errno);
518	}
519	#else
520	else
521	{
522	RTFSOBJINFO ObjInfo;
523	rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX, fFlags);
524	if (RT_SUCCESS(rc) && RTFS_IS_SYMLINK(ObjInfo.Attr.fMode))
525	rc = VERR_NS_SYMLINK_CHANGE_OWNER;
526	else if (RT_SUCCESS(rc))
527	{
528	if (lchown(pszNativePath, uidNative, gidNative))
529	rc = RTErrConvertFromErrno(errno);
530	}
531	}
532	#endif
533	if (RT_FAILURE(rc))
534	Log(("RTPathSetOwnerEx('%s',%d,%d): failed with %Rrc and errno=%d\n",
535	pszPath, uid, gid, rc, errno));
536
537	rtPathFreeNative(pszNativePath, pszPath);
538	}
539
540	LogFlow(("RTPathSetOwnerEx(%p:{%s}, uid, gid): return %Rrc\n",
541	pszPath, pszPath, uid, gid, rc));
542	return rc;
543	}
544
545
546	RTR3DECL(int) RTPathSetMode(const char *pszPath, RTFMODE fMode)
547	{
548	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
549	AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
550
551	int rc;
552	fMode = rtFsModeNormalize(fMode, pszPath, 0);
553	if (rtFsModeIsValidPermissions(fMode))
554	{
555	char const *pszNativePath;
556	rc = rtPathToNative(&pszNativePath, pszPath, NULL);
557	if (RT_SUCCESS(rc))
558	{
559	if (chmod(pszNativePath, fMode & RTFS_UNIX_MASK) != 0)
560	rc = RTErrConvertFromErrno(errno);
561	rtPathFreeNative(pszNativePath, pszPath);
562	}
563	}
564	else
565	{
566	AssertMsgFailed(("Invalid file mode! %RTfmode\n", fMode));
567	rc = VERR_INVALID_FMODE;
568	}
569	return rc;
570	}
571
572
573	/**
574	* Checks if two files are the one and same file.
575	*/
576	static bool rtPathSame(const char pszNativeSrc, const char pszNativeDst)
577	{
578	struct stat SrcStat;
579	if (stat(pszNativeSrc, &SrcStat))
580	return false;
581	struct stat DstStat;
582	if (stat(pszNativeDst, &DstStat))
583	return false;
584	Assert(SrcStat.st_dev && DstStat.st_dev);
585	Assert(SrcStat.st_ino && DstStat.st_ino);
586	if ( SrcStat.st_dev == DstStat.st_dev
587	&& SrcStat.st_ino == DstStat.st_ino
588	&& (SrcStat.st_mode & S_IFMT) == (DstStat.st_mode & S_IFMT))
589	return true;
590	return false;
591	}
592
593
594	/**
595	* Worker for RTPathRename, RTDirRename, RTFileRename.
596	*
597	* @returns IPRT status code.
598	* @param pszSrc The source path.
599	* @param pszDst The destination path.
600	* @param fRename The rename flags.
601	* @param fFileType The filetype. We use the RTFMODE filetypes here. If it's 0,
602	* anything goes. If it's RTFS_TYPE_DIRECTORY we'll check that the
603	* source is a directory. If Its RTFS_TYPE_FILE we'll check that it's
604	* not a directory (we are NOT checking whether it's a file).
605	*/
606	DECLHIDDEN(int) rtPathPosixRename(const char pszSrc, const char pszDst, unsigned fRename, RTFMODE fFileType)
607	{
608	/*
609	* Convert the paths.
610	*/
611	char const *pszNativeSrc;
612	int rc = rtPathToNative(&pszNativeSrc, pszSrc, NULL);
613	if (RT_SUCCESS(rc))
614	{
615	char const *pszNativeDst;
616	rc = rtPathToNative(&pszNativeDst, pszDst, NULL);
617	if (RT_SUCCESS(rc))
618	{
619	/*
620	* Check that the source exists and that any types that's specified matches.
621	* We have to check this first to avoid getting errnous VERR_ALREADY_EXISTS
622	* errors from the next step.
623	*
624	* There are race conditions here (perhaps unlikely ones but still), but I'm
625	* afraid there is little with can do to fix that.
626	*/
627	struct stat SrcStat;
628	if (stat(pszNativeSrc, &SrcStat))
629	rc = RTErrConvertFromErrno(errno);
630	else if (!fFileType)
631	rc = VINF_SUCCESS;
632	else if (RTFS_IS_DIRECTORY(fFileType))
633	rc = S_ISDIR(SrcStat.st_mode) ? VINF_SUCCESS : VERR_NOT_A_DIRECTORY;
634	else
635	rc = S_ISDIR(SrcStat.st_mode) ? VERR_IS_A_DIRECTORY : VINF_SUCCESS;
636	if (RT_SUCCESS(rc))
637	{
638	bool fSameFile = false;
639
640	/*
641	* Check if the target exists, rename is rather destructive.
642	* We'll have to make sure we don't overwrite the source!
643	* Another race condition btw.
644	*/
645	struct stat DstStat;
646	if (stat(pszNativeDst, &DstStat))
647	rc = errno == ENOENT ? VINF_SUCCESS : RTErrConvertFromErrno(errno);
648	else
649	{
650	Assert(SrcStat.st_dev && DstStat.st_dev);
651	Assert(SrcStat.st_ino && DstStat.st_ino);
652	if ( SrcStat.st_dev == DstStat.st_dev
653	&& SrcStat.st_ino == DstStat.st_ino
654	&& (SrcStat.st_mode & S_IFMT) == (DstStat.st_mode & S_IFMT))
655	{
656	/*
657	* It's likely that we're talking about the same file here.
658	* We should probably check paths or whatever, but for now this'll have to be enough.
659	*/
660	fSameFile = true;
661	}
662	if (fSameFile)
663	rc = VINF_SUCCESS;
664	else if (S_ISDIR(DstStat.st_mode) \|\| !(fRename & RTPATHRENAME_FLAGS_REPLACE))
665	rc = VERR_ALREADY_EXISTS;
666	else
667	rc = VINF_SUCCESS;
668
669	}
670	if (RT_SUCCESS(rc))
671	{
672	if (!rename(pszNativeSrc, pszNativeDst))
673	rc = VINF_SUCCESS;
674	else if ( (fRename & RTPATHRENAME_FLAGS_REPLACE)
675	&& (errno == ENOTDIR \|\| errno == EEXIST))
676	{
677	/*
678	* Check that the destination isn't a directory.
679	* Yet another race condition.
680	*/
681	if (rtPathSame(pszNativeSrc, pszNativeDst))
682	{
683	rc = VINF_SUCCESS;
684	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): appears to be the same file... (errno=%d)\n",
685	pszSrc, pszDst, fRename, fFileType, errno));
686	}
687	else
688	{
689	if (stat(pszNativeDst, &DstStat))
690	rc = errno != ENOENT ? RTErrConvertFromErrno(errno) : VINF_SUCCESS;
691	else if (S_ISDIR(DstStat.st_mode))
692	rc = VERR_ALREADY_EXISTS;
693	else
694	rc = VINF_SUCCESS;
695	if (RT_SUCCESS(rc))
696	{
697	if (!unlink(pszNativeDst))
698	{
699	if (!rename(pszNativeSrc, pszNativeDst))
700	rc = VINF_SUCCESS;
701	else
702	{
703	rc = RTErrConvertFromErrno(errno);
704	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): rename failed rc=%Rrc errno=%d\n",
705	pszSrc, pszDst, fRename, fFileType, rc, errno));
706	}
707	}
708	else
709	{
710	rc = RTErrConvertFromErrno(errno);
711	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): failed to unlink dst rc=%Rrc errno=%d\n",
712	pszSrc, pszDst, fRename, fFileType, rc, errno));
713	}
714	}
715	else
716	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): dst !dir check failed rc=%Rrc\n",
717	pszSrc, pszDst, fRename, fFileType, rc));
718	}
719	}
720	else
721	{
722	rc = RTErrConvertFromErrno(errno);
723	if (errno == ENOTDIR)
724	rc = VERR_ALREADY_EXISTS; /* unless somebody is racing us, this is the right interpretation */
725	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): rename failed rc=%Rrc errno=%d\n",
726	pszSrc, pszDst, fRename, fFileType, rc, errno));
727	}
728	}
729	else
730	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): destination check failed rc=%Rrc errno=%d\n",
731	pszSrc, pszDst, fRename, fFileType, rc, errno));
732	}
733	else
734	Log(("rtPathRename('%s', '%s', %#x ,%RTfmode): source type check failed rc=%Rrc errno=%d\n",
735	pszSrc, pszDst, fRename, fFileType, rc, errno));
736
737	rtPathFreeNative(pszNativeDst, pszDst);
738	}
739	rtPathFreeNative(pszNativeSrc, pszSrc);
740	}
741	return rc;
742	}
743
744
745	RTR3DECL(int) RTPathRename(const char pszSrc, const char pszDst, unsigned fRename)
746	{
747	/*
748	* Validate input.
749	*/
750	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
751	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
752	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
753	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
754	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
755
756	/*
757	* Hand it to the worker.
758	*/
759	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, 0);
760
761	Log(("RTPathRename(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n", pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
762	return rc;
763	}
764
765
766	RTDECL(bool) RTPathExists(const char *pszPath)
767	{
768	return RTPathExistsEx(pszPath, RTPATH_F_FOLLOW_LINK);
769	}
770
771
772	RTDECL(bool) RTPathExistsEx(const char *pszPath, uint32_t fFlags)
773	{
774	/*
775	* Validate input.
776	*/
777	AssertPtrReturn(pszPath, false);
778	AssertReturn(*pszPath, false);
779	Assert(RTPATH_F_IS_VALID(fFlags, 0));
780
781	/*
782	* Convert the path and check if it exists using stat().
783	*/
784	char const *pszNativePath;
785	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
786	if (RT_SUCCESS(rc))
787	{
788	struct stat Stat;
789	if (fFlags & RTPATH_F_FOLLOW_LINK)
790	rc = stat(pszNativePath, &Stat);
791	else
792	rc = lstat(pszNativePath, &Stat);
793	if (!rc)
794	rc = VINF_SUCCESS;
795	else
796	rc = VERR_GENERAL_FAILURE;
797	rtPathFreeNative(pszNativePath, pszPath);
798	}
799	return RT_SUCCESS(rc);
800	}
801
802
803	RTDECL(int) RTPathGetCurrent(char *pszPath, size_t cchPath)
804	{
805	int rc;
806	char szNativeCurDir[RTPATH_MAX];
807	if (getcwd(szNativeCurDir, sizeof(szNativeCurDir)) != NULL)
808	rc = rtPathFromNativeCopy(pszPath, cchPath, szNativeCurDir, NULL);
809	else
810	rc = RTErrConvertFromErrno(errno);
811	return rc;
812	}
813
814
815	RTDECL(int) RTPathSetCurrent(const char *pszPath)
816	{
817	/*
818	* Validate input.
819	*/
820	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
821	AssertReturn(*pszPath, VERR_INVALID_PARAMETER);
822
823	/*
824	* Change the directory.
825	*/
826	char const *pszNativePath;
827	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
828	if (RT_SUCCESS(rc))
829	{
830	if (chdir(pszNativePath))
831	rc = RTErrConvertFromErrno(errno);
832	rtPathFreeNative(pszNativePath, pszPath);
833	}
834	return rc;
835	}
836

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source: vbox/trunk/src/VBox/Runtime/r3/posix/path-posix.cpp@ 34002

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