and most character devices don't support it.
@item
When the third argument is invalid, POSIX says that @code{lseek} should set
-@code{errno} to @code{EINVAL} and return -1, but in this situation a
+@code{errno} to @code{EINVAL} and return @minus{}1, but in this situation a
@code{SIGSYS} signal is raised on some platforms:
IRIX 6.5.
@item