[libc] Add a few missing deps, includes, and fix a few typos.

This allows us to enable rmdir, mkdir, mkdirat, unlink and unlinkat for
aarch64.

libc/config/linux/aarch64/entrypoints.txt

@@ -81,10 +81,17 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.strtoul
     libc.src.stdlib.strtoull
 
+    # sys/stat.h entrypoints
+    libc.src.sys.stat.mkdir
+    libc.src.sys.stat.mkdirat
+
     # unistd.h entrypoints
     libc.src.unistd.close
     libc.src.unistd.fsync
     libc.src.unistd.read
+    libc.src.unistd.rmdir
+    libc.src.unistd.unlink
+    libc.src.unistd.unlinkat
     libc.src.unistd.write
 )
 

libc/src/sys/stat/linux/CMakeLists.txt

@@ -5,6 +5,7 @@ add_entrypoint_object(
   HDRS
     ../mkdir.h
   DEPENDS
+    libc.include.fcntl
     libc.include.sys_stat
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil

libc/src/sys/stat/linux/mkdir.cpp

@@ -12,6 +12,7 @@
 #include "src/__support/common.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/syscall.h> // For syscall numbers.
 

libc/src/unistd/linux/CMakeLists.txt

@@ -44,6 +44,7 @@ add_entrypoint_object(
   HDRS
     ../rmdir.h
   DEPENDS
+    libc.include.fcntl
     libc.include.unistd
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
@@ -57,6 +58,7 @@ add_entrypoint_object(
   HDRS
     ../unlink.h
   DEPENDS
+    libc.include.fcntl
     libc.include.unistd
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
@@ -70,6 +72,7 @@ add_entrypoint_object(
   HDRS
     ../unlinkat.h
   DEPENDS
+    libc.include.fcntl
     libc.include.unistd
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil

libc/src/unistd/linux/rmdir.cpp

@@ -12,6 +12,7 @@
 #include "src/__support/common.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <sys/syscall.h> // For syscall numbers.
 
 namespace __llvm_libc {
@@ -20,7 +21,7 @@ LLVM_LIBC_FUNCTION(int, rmdir, (const char *path)) {
 #ifdef SYS_rmdir
   long ret = __llvm_libc::syscall(SYS_rmdir, path);
 #elif defined(SYS_unlinkat)
-  long ret = __llvm_libc::syscall(SYS_unlinkat, AT_FDCWD, path, 0);
+  long ret = __llvm_libc::syscall(SYS_unlinkat, AT_FDCWD, path, AT_REMOVEDIR);
 #else
 #error "rmdir and unlinkat syscalls not available."
 #endif

libc/src/unistd/linux/unlink.cpp

@@ -12,6 +12,7 @@
 #include "src/__support/common.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <sys/syscall.h> // For syscall numbers.
 
 namespace __llvm_libc {

libc/src/unistd/linux/unlinkat.cpp

@@ -12,6 +12,7 @@
 #include "src/__support/common.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <sys/syscall.h> // For syscall numbers.
 
 namespace __llvm_libc {

libc/test/src/fcntl/openat_test.cpp

@@ -15,6 +15,7 @@
 #include "utils/testutils/FDReader.h"
 
 #include <errno.h>
+#include <fcntl.h>
 
 TEST(LlvmLibcUniStd, OpenAndReadTest) {
   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;

libc/test/src/sys/stat/mkdirat_test.cpp

@@ -17,7 +17,7 @@
 
 TEST(LlvmLibcMkdiratTest, CreateAndRemove) {
   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
-  constexpr const char *TEST_DIR = "testdata/rmdir.testdir";
+  constexpr const char *TEST_DIR = "testdata/mkdirat.testdir";
   ASSERT_THAT(__llvm_libc::mkdirat(AT_FDCWD, TEST_DIR, S_IRWXU), Succeeds(0));
   ASSERT_THAT(__llvm_libc::rmdir(TEST_DIR), Succeeds(0));
 }