osx man page for sync_volume_np

SYNC_VOLUME_NP(3)					   BSD Library Functions Manual 					 SYNC_VOLUME_NP(3)

NAME
     sync_volume_np -- Sync a mounted filesystem

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     sync_volume_np(const char *path, int flags);

     int
     fsync_volume_np(int fd, int flags);

DESCRIPTION
     The sync_volume_np() function causes data and metadata on the filesystem containing path to be synced to disk; this may be any file or direc-
     tory on that filesystem.  The fsync_volume_np() does the same thing, but using an open file descriptor for that filesystem.  Both functions
     take a flags parameter, with the currently-defined options:

	   SYNC_VOLUME_FULLSYNC  Request that the data and metadata be written to the disk hardware; if not set, then the hardware may keep it in
				 cache.

	   SYNC_VOLUME_WAIT	 Wait for the data and metadata to be written; if not set, then it will return when the requests have been made.

RETURN VALUES
     Both functions return 0 on success, and a non-zero error code on error.

ERRORS
     The fsync_volume_np() function may return EBADF if the fd parameter is not a valid, open file descriptor.	The sync_volume_np() function may
     return errors if:

     [EACCES]	   Search permission is denied for a component of the path prefix.

     [EIO]	   An I/O error occurs while reading from or writing to the file system.

     [ELOOP]	   Too many symbolic links are encountered in translating the pathname.  This is taken to be indicative of a looping symbolic
		   link.

     [ENAMETOOLONG]
		   A component of a pathname exceeds {NAME_MAX} characters, or an entire path name exceeds {PATH_MAX} characters.

     [ENOENT]	   The named file does not exist.

     [ENOTDIR]	   A component of the path prefix is not a directory.

BSD
								   June 2, 2019 							       BSD