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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
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17
libc/calls/open.c
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@ -16,14 +16,8 @@
│ 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.
@ -34,23 +28,14 @@
* @param mode is an octal user/group/other permission signifier, that's
* ignored if O_CREAT or O_TMPFILE weren't passed
* @return number needing close(), or -1 w/ errno
* @note don't call open() from signal handlers
* @asyncsignalsafe
* @vforksafe
*/
nodiscard int open(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 (!file) return efault();
if (weaken(__zipos_open) && weaken(__zipos_parseuri)(file, &zipname) != -1) {
return weaken(__zipos_open)(&zipname, flags, mode);
} else if (!IsWindows()) {
return openat$sysv(AT_FDCWD, file, flags, mode);
} else {
return open$nt(file, flags, mode);
}
return openat(AT_FDCWD, file, flags, mode);
}