mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-28 15:28:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Support dirfd relative iops on Windows

Browse source 
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

26
libc/calls/openat.c
View file

@ -16,15 +16,20 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
/**
* Opens file, the modern way.
* Opens file.
*
* @param dirfd is normally AT_FDCWD or an open relative directory thing
* @param dirfd is normally AT_FDCWD but if it's an open directory and
* file is a relative path, then file is opened relative to dirfd
* @param file is a UTF-8 string, preferably relative w/ forward slashes
* @param flags should be O_RDONLY, O_WRONLY, or O_RDWR, and can be or'd
* with O_CREAT, O_TRUNC, O_APPEND, O_EXCL, O_CLOEXEC, O_TMPFILE
@ -33,16 +38,23 @@
* @return number needing close(), or -1 w/ errno
* @asyncsignalsafe
*/
int openat(int dirfd, const char *pathname, int flags, ...) {
nodiscard int openat(int dirfd, const char *file, int flags, ...) {
va_list va;
unsigned mode;
struct ZiposUri zipname;
va_start(va, flags);
mode = va_arg(va, unsigned);
va_end(va);
if (!pathname) return efault();
if (dirfd == AT_FDCWD) {
return open(pathname, flags, mode);
if (!file) return efault();
if (weaken(__zipos_open) && weaken(__zipos_parseuri)(file, &zipname) != -1) {
if (dirfd == AT_FDCWD) {
return weaken(__zipos_open)(&zipname, flags, mode);
} else {
return eopnotsupp(); /* TODO */
}
} else if (!IsWindows()) {
return openat$sysv(dirfd, file, flags, mode);
} else {
return openat$sysv(dirfd, pathname, flags, mode);
return open$nt(dirfd, file, flags, mode);
}
}