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Make w32_rename() Atomic For Files (#438)

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Bryan Berns 2020-04-02 13:17:27 -04:00 committed by GitHub
parent 901f123915
commit 106db2baac
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 17 deletions
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32
contrib/win32/win32compat/misc.c
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@ -41,9 +41,9 @@
#include <LM.h>
#include <Sddl.h>
#include <Aclapi.h>
#include <Ntsecapi.h>
#include <security.h>
#include <ntstatus.h>
#include <malloc.h>
#include "inc\unistd.h"
#include "inc\sys\stat.h"
@ -56,12 +56,9 @@
#include "inc\sys\ioctl.h"
#include "inc\fcntl.h"
#include "inc\utf.h"
#include "signal_internal.h"
#include "misc_internal.h"
#include "debug.h"
#include "w32fd.h"
#include "inc\string.h"
#include "inc\grp.h"
#include "inc\time.h"
#include <wchar.h>
@ -746,20 +743,15 @@ w32_rename(const char *old_name, const char *new_name)
return -1;
/*
* To be consistent with POSIX rename(),
* 1) if the new_name is file, then delete it so that _wrename will succeed.
* 2) if the new_name is directory and it is empty then delete it so that _wrename will succeed.
* To be consistent with POSIX rename(), if the new_name is directory
* and it is empty then delete it so that MoveFileEx will succeed.
*/
struct _stat64 st_new;
struct _stat64 st_old;
if ((fileio_stat(new_name, &st_new) != -1) &&
(fileio_stat(old_name, &st_old) != -1)) {
if (((st_old.st_mode & _S_IFMT) == _S_IFREG) &&
((st_new.st_mode & _S_IFMT) == _S_IFREG))
w32_unlink(new_name);
if (((st_old.st_mode & _S_IFMT) == _S_IFDIR) &&
((st_new.st_mode & _S_IFMT) == _S_IFDIR)) {
(fileio_stat(old_name, &st_old) != -1) &&
((st_old.st_mode & _S_IFMT) == _S_IFDIR) &&
((st_new.st_mode & _S_IFMT) == _S_IFDIR)) {
DIR *dirp = opendir(new_name);
if (NULL != dirp) {
struct dirent *dp = readdir(dirp);
@ -767,15 +759,21 @@ w32_rename(const char *old_name, const char *new_name)
if (dp == NULL)
w32_rmdir(new_name);
}
}
}
int returnStatus = _wrename(resolvedOldPathName_utf16, resolvedNewPathName_utf16);
const int returnStatus = MoveFileExW(resolvedOldPathName_utf16, resolvedNewPathName_utf16, MOVEFILE_REPLACE_EXISTING | MOVEFILE_COPY_ALLOWED);
free(resolvedOldPathName_utf16);
free(resolvedNewPathName_utf16);
return returnStatus;
/* Adjust errors and return codes to be consistent with rename() syscall */
if (returnStatus == 0) {
errno = errno_from_Win32LastError();
return -1;
}
return 0;
}
int