dir-posix.cpp@ 43363

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1	/* $Id: dir-posix.cpp 43363 2012-09-20 09:56:07Z vboxsync $ */
2	/** @file
3	* IPRT - Directory manipulation, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#define LOG_GROUP RTLOGGROUP_DIR
32	#include <errno.h>
33	#include <unistd.h>
34	#include <sys/types.h>
35	#include <sys/stat.h>
36	#include <fcntl.h>
37	#include <dirent.h>
38	#include <stdio.h>
39
40	#include <iprt/dir.h>
41	#include "internal/iprt.h"
42
43	#include <iprt/alloca.h>
44	#include <iprt/assert.h>
45	#include <iprt/err.h>
46	#include <iprt/log.h>
47	#include <iprt/mem.h>
48	#include <iprt/param.h>
49	#include <iprt/path.h>
50	#include <iprt/string.h>
51	#include "internal/dir.h"
52	#include "internal/fs.h"
53	#include "internal/path.h"
54
55	#if !defined(RT_OS_SOLARIS) && !defined(RT_OS_HAIKU)
56	# define HAVE_DIRENT_D_TYPE 1
57	#endif
58
59
60	RTDECL(bool) RTDirExists(const char *pszPath)
61	{
62	bool fRc = false;
63	char const *pszNativePath;
64	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
65	if (RT_SUCCESS(rc))
66	{
67	struct stat s;
68	fRc = !stat(pszNativePath, &s)
69	&& S_ISDIR(s.st_mode);
70
71	rtPathFreeNative(pszNativePath, pszPath);
72	}
73
74	LogFlow(("RTDirExists(%p={%s}): returns %RTbool\n", pszPath, pszPath, fRc));
75	return fRc;
76	}
77
78
79	RTDECL(int) RTDirCreate(const char *pszPath, RTFMODE fMode, uint32_t fCreate)
80	{
81	int rc;
82	fMode = rtFsModeNormalize(fMode, pszPath, 0);
83	if (rtFsModeIsValidPermissions(fMode))
84	{
85	char const *pszNativePath;
86	rc = rtPathToNative(&pszNativePath, pszPath, NULL);
87	if (RT_SUCCESS(rc))
88	{
89	if (mkdir(pszNativePath, fMode & RTFS_UNIX_MASK))
90	{
91	rc = errno;
92	bool fVerifyIsDir = true;
93	#ifdef RT_OS_SOLARIS
94	/*
95	* mkdir on nfs mount points has been/is busted in various
96	* during the Nevada development cycle. We've observed:
97	* - Build 111b (2009.06) returns EACCES.
98	* - Build ca. 70-80 returns ENOSYS.
99	*/
100	if ( rc == ENOSYS
101	\|\| rc == EACCES)
102	{
103	rc = RTErrConvertFromErrno(rc);
104	fVerifyIsDir = false; /* We'll check if it's a dir ourselves since we're going to stat() anyway. */
105	struct stat st;
106	if (!stat(pszNativePath, &st))
107	{
108	rc = VERR_ALREADY_EXISTS;
109	if (!S_ISDIR(st.st_mode))
110	rc = VERR_IS_A_FILE;
111	}
112	}
113	else
114	rc = RTErrConvertFromErrno(rc);
115	#else
116	rc = RTErrConvertFromErrno(rc);
117	#endif
118	if ( rc == VERR_ALREADY_EXISTS
119	&& fVerifyIsDir == true)
120	{
121	/*
122	* Verify that it really exists as a directory.
123	*/
124	struct stat st;
125	if (!stat(pszNativePath, &st) && !S_ISDIR(st.st_mode))
126	rc = VERR_IS_A_FILE;
127	}
128	}
129	}
130
131	rtPathFreeNative(pszNativePath, pszPath);
132	}
133	else
134	{
135	AssertMsgFailed(("Invalid file mode! %RTfmode\n", fMode));
136	rc = VERR_INVALID_FMODE;
137	}
138	LogFlow(("RTDirCreate(%p={%s}, %RTfmode): returns %Rrc\n", pszPath, pszPath, fMode, rc));
139	return rc;
140	}
141
142
143	RTDECL(int) RTDirRemove(const char *pszPath)
144	{
145	char const *pszNativePath;
146	int rc = rtPathToNative(&pszNativePath, pszPath, NULL);
147	if (RT_SUCCESS(rc))
148	{
149	if (rmdir(pszNativePath))
150	rc = RTErrConvertFromErrno(errno);
151
152	rtPathFreeNative(pszNativePath, pszPath);
153	}
154
155	LogFlow(("RTDirRemove(%p={%s}): returns %Rrc\n", pszPath, pszPath, rc));
156	return rc;
157	}
158
159
160	RTDECL(int) RTDirFlush(const char *pszPath)
161	{
162	/*
163	* Linux: The fsync() man page hints at this being required for ensuring
164	* consistency between directory and file in case of a crash.
165	*
166	* Solaris: No mentioned is made of directories on the fsync man page.
167	* While rename+fsync will do what we want on ZFS, the code needs more
168	* careful studying wrt whether the directory entry of a new file is
169	* implicitly synced when the file is synced (it's very likely for ZFS).
170	*
171	* FreeBSD: The FFS fsync code seems to flush the directory entry as well
172	* in some cases. Don't know exactly what's up with rename, but from the
173	* look of things fsync(dir) should work.
174	*/
175	int rc;
176	#ifdef O_DIRECTORY
177	int fd = open(pszPath, O_RDONLY \| O_DIRECTORY, 0);
178	#else
179	int fd = open(pszPath, O_RDONLY, 0);
180	#endif
181	if (fd >= 0)
182	{
183	if (fsync(fd) == 0)
184	rc = VINF_SUCCESS;
185	else
186	rc = RTErrConvertFromErrno(errno);
187	close(fd);
188	}
189	else
190	rc = RTErrConvertFromErrno(errno);
191	return rc;
192	}
193
194
195	int rtDirNativeOpen(PRTDIR pDir, char *pszPathBuf)
196	{
197	NOREF(pszPathBuf); /* only used on windows */
198
199	/*
200	* Convert to a native path and try opendir.
201	*/
202	char const *pszNativePath;
203	int rc = rtPathToNative(&pszNativePath, pDir->pszPath, NULL);
204	if (RT_SUCCESS(rc))
205	{
206	pDir->pDir = opendir(pszNativePath);
207	if (pDir->pDir)
208	{
209	/*
210	* Init data.
211	*/
212	pDir->fDataUnread = false;
213	memset(&pDir->Data, 0, RT_OFFSETOF(RTDIR, Data.d_name)); /* not strictly necessary */
214	memset(&pDir->Data.d_name[0], 0, pDir->cbMaxName);
215	}
216	else
217	rc = RTErrConvertFromErrno(errno);
218
219	rtPathFreeNative(pszNativePath, pDir->pszPath);
220	}
221
222	return rc;
223	}
224
225
226	RTDECL(int) RTDirClose(PRTDIR pDir)
227	{
228	/*
229	* Validate input.
230	*/
231	if (!pDir)
232	return VERR_INVALID_PARAMETER;
233	if (pDir->u32Magic != RTDIR_MAGIC)
234	{
235	AssertMsgFailed(("Invalid pDir=%p\n", pDir));
236	return VERR_INVALID_PARAMETER;
237	}
238
239	/*
240	* Close the handle.
241	*/
242	int rc = VINF_SUCCESS;
243	pDir->u32Magic = RTDIR_MAGIC_DEAD;
244	if (closedir(pDir->pDir))
245	{
246	rc = RTErrConvertFromErrno(errno);
247	AssertMsgFailed(("closedir(%p) -> errno=%d (%Rrc)\n", pDir->pDir, errno, rc));
248	}
249
250	RTMemFree(pDir);
251	return rc;
252	}
253
254
255	/**
256	* Ensure that there is unread data in the buffer
257	* and that there is a converted filename hanging around.
258	*
259	* @returns IPRT status code.
260	* @param pDir the open directory. Fully validated.
261	*/
262	static int rtDirReadMore(PRTDIR pDir)
263	{
264	/** @todo try avoid the rematching on buffer overflow errors. */
265	for (;;)
266	{
267	/*
268	* Fetch data?
269	*/
270	if (!pDir->fDataUnread)
271	{
272	struct dirent *pResult = NULL;
273	int rc = readdir_r(pDir->pDir, &pDir->Data, &pResult);
274	if (rc)
275	{
276	rc = RTErrConvertFromErrno(rc);
277	/** @todo Consider translating ENOENT (The current
278	* position of the directory stream is invalid)
279	* differently. */
280	AssertMsg(rc == VERR_FILE_NOT_FOUND, ("%Rrc\n", rc));
281	return rc;
282	}
283	if (!pResult)
284	return VERR_NO_MORE_FILES;
285	}
286
287	/*
288	* Convert the filename to UTF-8.
289	*/
290	if (!pDir->pszName)
291	{
292	int rc = rtPathFromNative(&pDir->pszName, pDir->Data.d_name, pDir->pszPath);
293	if (RT_FAILURE(rc))
294	{
295	pDir->pszName = NULL;
296	return rc;
297	}
298	pDir->cchName = strlen(pDir->pszName);
299	}
300	if ( !pDir->pfnFilter
301	\|\| pDir->pfnFilter(pDir, pDir->pszName))
302	break;
303	rtPathFreeIprt(pDir->pszName, pDir->Data.d_name);
304	pDir->pszName = NULL;
305	pDir->fDataUnread = false;
306	}
307
308	pDir->fDataUnread = true;
309	return VINF_SUCCESS;
310	}
311
312
313	#ifdef HAVE_DIRENT_D_TYPE
314	/**
315	* Converts the d_type field to IPRT directory entry type.
316	*
317	* @returns IPRT directory entry type.
318	* @param Unix
319	*/
320	static RTDIRENTRYTYPE rtDirType(int iType)
321	{
322	switch (iType)
323	{
324	case DT_UNKNOWN: return RTDIRENTRYTYPE_UNKNOWN;
325	case DT_FIFO: return RTDIRENTRYTYPE_FIFO;
326	case DT_CHR: return RTDIRENTRYTYPE_DEV_CHAR;
327	case DT_DIR: return RTDIRENTRYTYPE_DIRECTORY;
328	case DT_BLK: return RTDIRENTRYTYPE_DEV_BLOCK;
329	case DT_REG: return RTDIRENTRYTYPE_FILE;
330	case DT_LNK: return RTDIRENTRYTYPE_SYMLINK;
331	case DT_SOCK: return RTDIRENTRYTYPE_SOCKET;
332	case DT_WHT: return RTDIRENTRYTYPE_WHITEOUT;
333	default:
334	AssertMsgFailed(("iType=%d\n", iType));
335	return RTDIRENTRYTYPE_UNKNOWN;
336	}
337	}
338	#endif /HAVE_DIRENT_D_TYPE /
339
340
341	RTDECL(int) RTDirRead(PRTDIR pDir, PRTDIRENTRY pDirEntry, size_t *pcbDirEntry)
342	{
343	/*
344	* Validate and digest input.
345	*/
346	if (!rtDirValidHandle(pDir))
347	return VERR_INVALID_PARAMETER;
348	AssertMsgReturn(VALID_PTR(pDirEntry), ("%p\n", pDirEntry), VERR_INVALID_POINTER);
349
350	size_t cbDirEntry = sizeof(*pDirEntry);
351	if (pcbDirEntry)
352	{
353	AssertMsgReturn(VALID_PTR(pcbDirEntry), ("%p\n", pcbDirEntry), VERR_INVALID_POINTER);
354	cbDirEntry = *pcbDirEntry;
355	AssertMsgReturn(cbDirEntry >= RT_UOFFSETOF(RTDIRENTRY, szName[2]),
356	("Invalid pcbDirEntry=%d (min %d)\n", pcbDirEntry, RT_OFFSETOF(RTDIRENTRYEX, szName[2])),
357	VERR_INVALID_PARAMETER);
358	}
359
360	/*
361	* Fetch more data if necessary and/or convert the name.
362	*/
363	int rc = rtDirReadMore(pDir);
364	if (RT_SUCCESS(rc))
365	{
366	/*
367	* Check if we've got enough space to return the data.
368	*/
369	const char *pszName = pDir->pszName;
370	const size_t cchName = pDir->cchName;
371	const size_t cbRequired = RT_OFFSETOF(RTDIRENTRY, szName[1]) + cchName;
372	if (pcbDirEntry)
373	*pcbDirEntry = cbRequired;
374	if (cbRequired <= cbDirEntry)
375	{
376	/*
377	* Setup the returned data.
378	*/
379	pDirEntry->INodeId = pDir->Data.d_ino; /* may need #ifdefing later */
380	#ifdef HAVE_DIRENT_D_TYPE
381	pDirEntry->enmType = rtDirType(pDir->Data.d_type);
382	#else
383	pDirEntry->enmType = RTDIRENTRYTYPE_UNKNOWN;
384	#endif
385	pDirEntry->cbName = (uint16_t)cchName;
386	Assert(pDirEntry->cbName == cchName);
387	memcpy(pDirEntry->szName, pszName, cchName + 1);
388
389	/* free cached data */
390	pDir->fDataUnread = false;
391	rtPathFreeIprt(pDir->pszName, pDir->Data.d_name);
392	pDir->pszName = NULL;
393	}
394	else
395	rc = VERR_BUFFER_OVERFLOW;
396	}
397
398	LogFlow(("RTDirRead(%p:{%s}, %p:{%s}, %p:{%u}): returns %Rrc\n",
399	pDir, pDir->pszPath, pDirEntry, RT_SUCCESS(rc) ? pDirEntry->szName : "<failed>",
400	pcbDirEntry, pcbDirEntry ? *pcbDirEntry : 0, rc));
401	return rc;
402	}
403
404
405	/**
406	* Fills dummy info into the info structure.
407	* This function is called if we cannot stat the file.
408	*
409	* @param pInfo The struct in question.
410	* @param
411	*/
412	static void rtDirSetDummyInfo(PRTFSOBJINFO pInfo, RTDIRENTRYTYPE enmType)
413	{
414	pInfo->cbObject = 0;
415	pInfo->cbAllocated = 0;
416	RTTimeSpecSetNano(&pInfo->AccessTime, 0);
417	RTTimeSpecSetNano(&pInfo->ModificationTime, 0);
418	RTTimeSpecSetNano(&pInfo->ChangeTime, 0);
419	RTTimeSpecSetNano(&pInfo->BirthTime, 0);
420	memset(&pInfo->Attr, 0, sizeof(pInfo->Attr));
421	pInfo->Attr.enmAdditional = RTFSOBJATTRADD_NOTHING;
422	switch (enmType)
423	{
424	default:
425	case RTDIRENTRYTYPE_UNKNOWN: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL;
426	case RTDIRENTRYTYPE_FIFO: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_FIFO;
427	case RTDIRENTRYTYPE_DEV_CHAR: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_DEV_CHAR;
428	case RTDIRENTRYTYPE_DIRECTORY: pInfo->Attr.fMode = RTFS_DOS_DIRECTORY \| RTFS_TYPE_DIRECTORY;
429	case RTDIRENTRYTYPE_DEV_BLOCK: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_DEV_BLOCK;
430	case RTDIRENTRYTYPE_FILE: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_FILE;
431	case RTDIRENTRYTYPE_SYMLINK: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_SYMLINK;
432	case RTDIRENTRYTYPE_SOCKET: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_SOCKET;
433	case RTDIRENTRYTYPE_WHITEOUT: pInfo->Attr.fMode = RTFS_DOS_NT_NORMAL \| RTFS_TYPE_WHITEOUT;
434	}
435	}
436
437
438	RTDECL(int) RTDirReadEx(PRTDIR pDir, PRTDIRENTRYEX pDirEntry, size_t *pcbDirEntry, RTFSOBJATTRADD enmAdditionalAttribs, uint32_t fFlags)
439	{
440	/*
441	* Validate and digest input.
442	*/
443	if (!rtDirValidHandle(pDir))
444	return VERR_INVALID_PARAMETER;
445	AssertMsgReturn(VALID_PTR(pDirEntry), ("%p\n", pDirEntry), VERR_INVALID_POINTER);
446	AssertMsgReturn( enmAdditionalAttribs >= RTFSOBJATTRADD_NOTHING
447	&& enmAdditionalAttribs <= RTFSOBJATTRADD_LAST,
448	("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs),
449	VERR_INVALID_PARAMETER);
450	AssertMsgReturn(RTPATH_F_IS_VALID(fFlags, 0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
451	size_t cbDirEntry = sizeof(*pDirEntry);
452	if (pcbDirEntry)
453	{
454	AssertMsgReturn(VALID_PTR(pcbDirEntry), ("%p\n", pcbDirEntry), VERR_INVALID_POINTER);
455	cbDirEntry = *pcbDirEntry;
456	AssertMsgReturn(cbDirEntry >= (unsigned)RT_OFFSETOF(RTDIRENTRYEX, szName[2]),
457	("Invalid pcbDirEntry=%d (min %d)\n", pcbDirEntry, RT_OFFSETOF(RTDIRENTRYEX, szName[2])),
458	VERR_INVALID_PARAMETER);
459	}
460
461	/*
462	* Fetch more data if necessary and/or convert the name.
463	*/
464	int rc = rtDirReadMore(pDir);
465	if (RT_SUCCESS(rc))
466	{
467	/*
468	* Check if we've got enough space to return the data.
469	*/
470	const char *pszName = pDir->pszName;
471	const size_t cchName = pDir->cchName;
472	const size_t cbRequired = RT_OFFSETOF(RTDIRENTRYEX, szName[1]) + cchName;
473	if (pcbDirEntry)
474	*pcbDirEntry = cbRequired;
475	if (cbRequired <= cbDirEntry)
476	{
477	/*
478	* Setup the returned data.
479	*/
480	pDirEntry->cwcShortName = 0;
481	pDirEntry->wszShortName[0] = 0;
482	pDirEntry->cbName = (uint16_t)cchName;
483	Assert(pDirEntry->cbName == cchName);
484	memcpy(pDirEntry->szName, pszName, cchName + 1);
485
486	/* get the info data */
487	size_t cch = cchName + pDir->cchPath + 1;
488	char pszNamePath = (char )alloca(cch);
489	if (pszNamePath)
490	{
491	memcpy(pszNamePath, pDir->pszPath, pDir->cchPath);
492	memcpy(pszNamePath + pDir->cchPath, pszName, cchName + 1);
493	rc = RTPathQueryInfoEx(pszNamePath, &pDirEntry->Info, enmAdditionalAttribs, fFlags);
494	}
495	else
496	rc = VERR_NO_MEMORY;
497	if (RT_FAILURE(rc))
498	{
499	#ifdef HAVE_DIRENT_D_TYPE
500	rtDirSetDummyInfo(&pDirEntry->Info, rtDirType(pDir->Data.d_type));
501	#else
502	rtDirSetDummyInfo(&pDirEntry->Info, RTDIRENTRYTYPE_UNKNOWN);
503	#endif
504	rc = VWRN_NO_DIRENT_INFO;
505	}
506
507	/* free cached data */
508	pDir->fDataUnread = false;
509	rtPathFreeIprt(pDir->pszName, pDir->Data.d_name);
510	pDir->pszName = NULL;
511	}
512	else
513	rc = VERR_BUFFER_OVERFLOW;
514	}
515
516	return rc;
517	}
518
519
520	RTDECL(int) RTDirRename(const char pszSrc, const char pszDst, unsigned fRename)
521	{
522	/*
523	* Validate input.
524	*/
525	AssertMsgReturn(VALID_PTR(pszSrc), ("%p\n", pszSrc), VERR_INVALID_POINTER);
526	AssertMsgReturn(VALID_PTR(pszDst), ("%p\n", pszDst), VERR_INVALID_POINTER);
527	AssertMsgReturn(*pszSrc, ("%p\n", pszSrc), VERR_INVALID_PARAMETER);
528	AssertMsgReturn(*pszDst, ("%p\n", pszDst), VERR_INVALID_PARAMETER);
529	AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
530
531	/*
532	* Take common cause with RTPathRename.
533	*/
534	int rc = rtPathPosixRename(pszSrc, pszDst, fRename, RTFS_TYPE_DIRECTORY);
535
536	LogFlow(("RTDirRename(%p:{%s}, %p:{%s}): returns %Rrc\n",
537	pszSrc, pszSrc, pszDst, pszDst, rc));
538	return rc;
539	}
540

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

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