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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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11
test/libc/calls/mkdir_test.c
View file

@ -21,6 +21,7 @@
#include "libc/fmt/fmt.h"
#include "libc/log/check.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
@ -68,3 +69,13 @@ TEST(makedirs, testEmptyString_ENOENT) {
EXPECT_EQ(-1, makedirs("", 0755));
EXPECT_EQ(ENOENT, errno);
}
TEST(mkdirat, testRelativePath_opensRelativeToDirFd) {
int dirfd;
ASSERT_NE(-1, mkdir("foo", 0755));
ASSERT_NE(-1, (dirfd = open("foo", O_RDONLY | O_DIRECTORY)));
EXPECT_NE(-1, mkdirat(dirfd, "bar", 0755));
EXPECT_TRUE(isdirectory("foo/bar"));
EXPECT_EQ(-1, makedirs("", 0755));
EXPECT_NE(-1, close(dirfd));
}