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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

8
libc/calls/mkdirat.c
View file

@ -24,7 +24,8 @@
/**
* Creates directory a.k.a. folder.
*
* @param dirfd is normally AT_FDCWD
* @param dirfd is normally AT_FDCWD but if it's an open directory and
* path is relative, then path becomes relative to dirfd
* @param path is a UTF-8 string, preferably relative w/ forward slashes
* @param mode can be, for example, 0755
* @return 0 on success or -1 w/ errno
@ -33,12 +34,9 @@
* @see makedirs()
*/
int mkdirat(int dirfd, const char *path, unsigned mode) {
if (!path) return efault();
if (!IsWindows()) {
return mkdirat$sysv(dirfd, path, mode);
} else if (dirfd == AT_FDCWD) {
return mkdir$nt(path, mode);
} else {
return einval();
return mkdirat$nt(dirfd, path, mode);
}
}