Write tests and fixes for utimensat()

libc/calls/futimens.c

@@ -21,10 +21,11 @@
 /**
  * Sets atime/mtime on file descriptor.
  *
+ * This function is the same as `utimensat(fd, 0, ts, 0)`.
+ *
  * @param ts is atime/mtime, or null for current time
- * @note better than microsecond precision on most platforms
- * @see fstat() for reading timestamps
+ * @raise ENOSYS on RHEL5
  */
-int futimens(int fd, const struct timespec ts[hasatleast 2]) {
-  return utimensat(fd, NULL, ts, 0);
+int futimens(int fd, const struct timespec ts[2]) {
+  return utimensat(fd, 0, ts, 0);
 }

libc/calls/internal.h

@@ -123,6 +123,7 @@ i32 sys_clock_gettime_xnu(i32, struct timespec *) hidden;
 i32 sys_fstat(i32, struct stat *) hidden;
 i32 sys_fstatat(i32, const char *, struct stat *, i32) hidden;
 i32 sys_futimes(i32, const struct timeval *) hidden;
+i32 sys_futimens(i32, const struct timespec *) hidden;
 i32 sys_futimesat(i32, const char *, const struct timeval *) hidden;
 i32 sys_getitimer(i32, struct itimerval *) hidden;
 i32 sys_getrlimit(i32, struct rlimit *) hidden;

libc/calls/utimensat-nt.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/internal.h"
 #include "libc/calls/syscall_support-nt.internal.h"
 #include "libc/fmt/conv.h"
 #include "libc/nt/createfile.h"
@@ -34,14 +35,25 @@
 textwindows int sys_utimensat_nt(int dirfd, const char *path,
                                  const struct timespec ts[2], int flags) {
   int i, rc;
-  int64_t fh;
+  int64_t fh, closeme;
   uint16_t path16[PATH_MAX];
   struct NtFileTime ft[2], *ftp[2];
-  if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
-  if ((fh = CreateFile(path16, kNtFileWriteAttributes, kNtFileShareRead, NULL,
-                       kNtOpenExisting, kNtFileAttributeNormal, 0)) == -1) {
-    return __winerr();
+
+  if (path) {
+    if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
+    if ((fh = CreateFile(path16, kNtFileWriteAttributes, kNtFileShareRead, NULL,
+                         kNtOpenExisting, kNtFileAttributeNormal, 0)) != -1) {
+      closeme = fh;
+    } else {
+      return __winerr();
+    }
+  } else if (__isfdkind(dirfd, kFdFile)) {
+    fh = g_fds.p[dirfd].handle;
+    closeme = -1;
+  } else {
+    return ebadf();
   }
+
   if (!ts || ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW) {
     GetSystemTimeAsFileTime(ft);
   }
@@ -65,6 +77,10 @@ textwindows int sys_utimensat_nt(int dirfd, const char *path,
   } else {
     rc = __winerr();
   }
-  CloseHandle(fh);
+
+  if (closeme != -1) {
+    CloseHandle(fh);
+  }
+
   return rc;
 }

libc/calls/utimensat-sysv.c

@@ -27,22 +27,24 @@ int sys_utimensat(int dirfd, const char *path, const struct timespec ts[2],
                   int flags) {
   int rc, olderr;
   struct timeval tv[2];
-  if (weaken(__zipos_notat) && weaken(__zipos_notat)(dirfd, path) == -1) {
-    return -1; /* TODO(jart): implement me */
-  }
   if (!IsXnu()) {
-    olderr = errno;
-    rc = __sys_utimensat(dirfd, path, ts, flags);
-    if ((rc == -1 && errno == ENOSYS) && dirfd == AT_FDCWD && !flags) {
-      errno = olderr;
-      if (ts) {
-        tv[0].tv_sec = ts[0].tv_sec;
-        tv[0].tv_usec = ts[0].tv_nsec / 1000;
-        tv[1].tv_sec = ts[1].tv_sec;
-        tv[1].tv_usec = ts[1].tv_nsec / 1000;
-        rc = sys_utimes(path, tv);
-      } else {
-        rc = sys_utimes(path, NULL);
+    if (!path && (IsFreebsd() || IsNetbsd() || IsOpenbsd())) {
+      rc = sys_futimens(dirfd, ts);
+    } else {
+      olderr = errno;
+      rc = __sys_utimensat(dirfd, path, ts, flags);
+      // TODO(jart): How does RHEL5 do futimes()?
+      if (rc == -1 && errno == ENOSYS && path) {
+        errno = olderr;
+        if (ts) {
+          tv[0].tv_sec = ts[0].tv_sec;
+          tv[0].tv_usec = ts[0].tv_nsec / 1000;
+          tv[1].tv_sec = ts[1].tv_sec;
+          tv[1].tv_usec = ts[1].tv_nsec / 1000;
+          rc = sys_utimes(path, tv);
+        } else {
+          rc = sys_utimes(path, NULL);
+        }
       }
     }
     return rc;

libc/calls/utimensat.c

@@ -24,25 +24,45 @@
 #include "libc/dce.h"
 #include "libc/intrin/asan.internal.h"
 #include "libc/intrin/describeflags.internal.h"
+#include "libc/sysv/consts/at.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/zipos/zipos.internal.h"
 
 /**
  * Sets atime/mtime on file, the modern way.
  *
+ * This is two functions in one. If `path` is null then this function
+ * becomes the same as `futimens(dirfd, ts)`.
+ *
+ * XNU and RHEL5 only have microsecond accuracy and there's no `dirfd`
+ * relative support.
+ *
+ * @param dirfd should AT_FDCWD
  * @param ts is atime/mtime, or null for current time
  * @param flags can have AT_SYMLINK_NOFOLLOW
- * @note no xnu/rhel5 support if dirfd≠AT_FDCWD∨flags≠0
+ * @raise ENOSYS on RHEL5 if path is NULL
+ * @raise EINVAL if flags had unrecognized bits
+ * @raise EINVAL if path is NULL and flags has AT_SYMLINK_NOFOLLOW
+ * @raise EBADF if dirfd isn't a valid fd or AT_FDCWD
+ * @raise EFAULT if path or ts memory was invalid
+ * @raise EROFS if file system is read-only
+ * @raise ENAMETOOLONG
+ * @raise EPERM
+ * @see futimens()
  * @asyncsignalsafe
  */
 int utimensat(int dirfd, const char *path, const struct timespec ts[2],
               int flags) {
   int rc;
   char buf[12];
-  if (IsAsan() && (!__asan_is_valid(path, 1) ||
+  if (IsAsan() && ((dirfd == AT_FDCWD && !__asan_is_valid(path, 1)) ||
                    (ts && (!__asan_is_valid_timespec(ts + 0) ||
                            !__asan_is_valid_timespec(ts + 1))))) {
-    rc = efault();
+    rc = efault();  // bad memory
+  } else if ((flags & ~AT_SYMLINK_NOFOLLOW)) {
+    rc = einval();  // unsupported flag
+  } else if (!path && flags) {
+    rc = einval();  // futimens() doesn't take flags
   } else if (weaken(__zipos_notat) && (rc = __zipos_notat(dirfd, path)) == -1) {
     STRACE("zipos mkdirat not supported yet");
   } else if (!IsWindows()) {

libc/isystem/sys/stat.h

@@ -7,12 +7,4 @@
 #include "libc/sysv/consts/s.h"
 #include "libc/sysv/consts/utime.h"
 #include "libc/time/time.h"
-
-#define st_atime      st_atim.tv_sec
-#define st_atime_nsec st_atim.tv_nsec
-#define st_mtime      st_mtim.tv_sec
-#define st_mtime_nsec st_mtim.tv_nsec
-#define st_ctime      st_ctim.tv_sec
-#define st_ctime_nsec st_ctim.tv_nsec
-
 #endif