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cygwin: Implement renameat2 

Define the RENAME_NOREPLACE flag in <cygwin/fs.h> as defined on Linux
in <linux/fs.h>.  The other RENAME_* flags defined on Linux are not
supported.
This commit is contained in:
Ken Brown 2017-08-17 09:12:15 -04:00 committed by Corinna Vinschen
parent c496cbb6bd
commit f665b1cef3
5 changed files with 54 additions and 7 deletions
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3
newlib/libc/include/stdio.h
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@ -384,6 +384,9 @@ int _EXFUN(vdprintf, (int, const char *__restrict, __VALIST)
#endif
#if __ATFILE_VISIBLE
int _EXFUN(renameat, (int, const char *, int, const char *));
# ifdef __CYGWIN__
int _EXFUN(renameat2, (int, const char *, int, const char *, unsigned int));
# endif
#endif
/*

1
winsup/cygwin/common.din
View File

@ -1168,6 +1168,7 @@ remquof NOSIGFE
remquol NOSIGFE
rename SIGFE
renameat SIGFE
renameat2 SIGFE
res_close = __res_close SIGFE
res_init = __res_init SIGFE
res_mkquery = __res_mkquery SIGFE

6
winsup/cygwin/include/cygwin/fs.h
View File

@ -19,4 +19,10 @@ details. */
#define BLKPBSZGET 0x0000127b
#define BLKGETSIZE64 0x00041268
/* Flags for renameat2, from /usr/include/linux/fs.h. For now we
support only RENAME_NOREPLACE. */
#define RENAME_NOREPLACE (1 << 0)
/* #define RENAME_EXCHANGE (1 << 1) */
/* #define RENAME_WHITEOUT (1 << 2) */
#endif

3
winsup/cygwin/include/cygwin/version.h
View File

@ -481,12 +481,13 @@ details. */
314: Export explicit_bzero.
315: Export pthread_mutex_timedlock.
316: Export pthread_rwlock_timedrdlock, pthread_rwlock_timedwrlock.
317: Export renameat2.
Note that we forgot to bump the api for ualarm, strtoll, strtoull,
sigaltstack, sethostname. */
#define CYGWIN_VERSION_API_MAJOR 0
#define CYGWIN_VERSION_API_MINOR 316
#define CYGWIN_VERSION_API_MINOR 317
/* There is also a compatibity version number associated with the shared memory
regions. It is incremented when incompatible changes are made to the shared

48
winsup/cygwin/syscalls.cc
View File

@ -60,6 +60,7 @@ details. */
#include "tls_pbuf.h"
#include "sync.h"
#include "child_info.h"
#include <cygwin/fs.h> /* needed for RENAME_NOREPLACE */
#undef _close
#undef _lseek
@ -2048,14 +2049,19 @@ nt_path_has_executable_suffix (PUNICODE_STRING upath)
return false;
}
extern "C" int
rename (const char *oldpath, const char *newpath)
/* If newpath names an existing file and the RENAME_NOREPLACE flag is
specified, fail with EEXIST. Exception: Don't fail if the purpose
of the rename is just to change the case of oldpath on a
case-insensitive file system. */
static int
rename2 (const char *oldpath, const char *newpath, unsigned int flags)
{
tmp_pathbuf tp;
int res = -1;
path_conv oldpc, newpc, new2pc, *dstpc, *removepc = NULL;
bool old_dir_requested = false, new_dir_requested = false;
bool old_explicit_suffix = false, new_explicit_suffix = false;
bool noreplace = flags & RENAME_NOREPLACE;
size_t olen, nlen;
bool equal_path;
NTSTATUS status = STATUS_SUCCESS;
@ -2068,6 +2074,12 @@ rename (const char *oldpath, const char *newpath)
__try
{
if (flags & ~RENAME_NOREPLACE)
/* RENAME_NOREPLACE is the only flag currently supported. */
{
set_errno (EINVAL);
__leave;
}
if (!*oldpath || !*newpath)
{
/* Reject rename("","x"), rename("x",""). */
@ -2337,6 +2349,13 @@ rename (const char *oldpath, const char *newpath)
__leave;
}
/* Should we replace an existing file? */
if ((removepc || dstpc->exists ()) && noreplace)
{
set_errno (EEXIST);
__leave;
}
/* Opening the file must be part of the transaction. It's not sufficient
to call only NtSetInformationFile under the transaction. Therefore we
have to start the transaction here, if necessary. */
@ -2491,11 +2510,15 @@ rename (const char *oldpath, const char *newpath)
__leave;
}
pfri = (PFILE_RENAME_INFORMATION) tp.w_get ();
pfri->ReplaceIfExists = TRUE;
pfri->ReplaceIfExists = !noreplace;
pfri->RootDirectory = NULL;
pfri->FileNameLength = dstpc->get_nt_native_path ()->Length;
memcpy (&pfri->FileName, dstpc->get_nt_native_path ()->Buffer,
pfri->FileNameLength);
/* If dstpc points to an existing file and RENAME_NOREPLACE has
been specified, then we should get NT error
STATUS_OBJECT_NAME_COLLISION ==> Win32 error
ERROR_ALREADY_EXISTS ==> Cygwin error EEXIST. */
status = NtSetInformationFile (fh, &io, pfri,
sizeof *pfri + pfri->FileNameLength,
FileRenameInformation);
@ -2578,6 +2601,12 @@ rename (const char *oldpath, const char *newpath)
return res;
}
extern "C" int
rename (const char *oldpath, const char *newpath)
{
return rename2 (oldpath, newpath, 0);
}
extern "C" int
system (const char *cmdstring)
{
@ -4719,8 +4748,8 @@ readlinkat (int dirfd, const char *__restrict pathname, char *__restrict buf,
}
extern "C" int
renameat (int olddirfd, const char *oldpathname,
int newdirfd, const char *newpathname)
renameat2 (int olddirfd, const char *oldpathname,
int newdirfd, const char *newpathname, unsigned int flags)
{
tmp_pathbuf tp;
__try
@ -4731,13 +4760,20 @@ renameat (int olddirfd, const char *oldpathname,
char *newpath = tp.c_get ();
if (gen_full_path_at (newpath, newdirfd, newpathname))
__leave;
return rename (oldpath, newpath);
return rename2 (oldpath, newpath, flags);
}
__except (EFAULT) {}
__endtry
return -1;
}
extern "C" int
renameat (int olddirfd, const char *oldpathname,
int newdirfd, const char *newpathname)
{
return renameat2 (olddirfd, oldpathname, newdirfd, newpathname, 0);
}
extern "C" int
scandirat (int dirfd, const char *pathname, struct dirent ***namelist,
int (*select) (const struct dirent *),