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Support dirfd relative iops on Windows

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We always favor calling functions like openat(), fstatat(), etc. because
Linux, XNU, FreeBSD, and OpenBSD all elected to support them, while some
systems like Android love them so much, that they stopped supporting the
old interfaces.

This change ensures that when dirfd is actually a dirfd and not AT_FDCWD
we'll do the right thing on Windows NT. We use an API that's been around
since Vista to accomplish that.

This change also adds exponential backoff to chdir() on Windows since it
seems almost as flaky on Windows 7 as the rmdir() function.
This commit is contained in:
Justine Tunney 2021-01-30 01:49:43 -08:00
parent b8d26e2418
commit 417797d218
42 changed files with 361 additions and 241 deletions
Download patch file Download diff file Expand all files Collapse all files

25
libc/calls/utimensat-nt.c
View file

@ -35,25 +35,12 @@ textwindows int utimensat$nt(int dirfd, const char *path,
const struct timespec ts[2], int flags) {
int i, rc;
int64_t fh;
bool closeme;
uint16_t path16[PATH_MAX];
struct NtFileTime ft[2], *ftp[2];
if (flags) return einval();
if (path) {
if (dirfd == AT_FDCWD) {
if (__mkntpath(path, path16) == -1) return -1;
if ((fh = CreateFile(path16, kNtFileWriteAttributes, kNtFileShareRead,
NULL, kNtOpenExisting, kNtFileAttributeNormal, 0)) !=
-1) {
closeme = true;
} else {
return __winerr();
}
} else {
return einval();
}
} else {
return ebadf();
if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
if ((fh = CreateFile(path16, kNtFileWriteAttributes, kNtFileShareRead, NULL,
kNtOpenExisting, kNtFileAttributeNormal, 0)) == -1) {
return __winerr();
}
if (!ts || ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW) {
GetSystemTimeAsFileTime(ft);
@ -78,8 +65,6 @@ textwindows int utimensat$nt(int dirfd, const char *path,
} else {
rc = __winerr();
}
if (closeme) {
CloseHandle(fh);
}
CloseHandle(fh);
return rc;
}