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##### unlink

Synopsis:

                int unlink(const char *pathname);

Request:
  ‘`Funlink,pathnameptr/len`’
Return value:
  On success, zero is returned. On error, -1 is returned.
Errors:
  `EACCES`
    No access to the file or the path of the file.
  `EPERM`
    The system does not allow unlinking of directories.
  `EBUSY`
    The file pathname cannot be unlinked because it's being used by another process.
  `EFAULT`
    pathnameptr is an invalid pointer value.
  `ENAMETOOLONG`
    pathname was too long.
  `ENOENT`
    A directory component in pathname does not exist.
  `ENOTDIR`
    A component of the path is not a directory.
  `EROFS`
    The file is on a read-only filesystem.
  `EINTR`
    The call was interrupted by the user.