.Fn nanosleep
call fails if:
.Bl -tag -width Er
-.It Bq Er EFAULT
-Either
-.Fa rqtp
-or
-.Fa rmtp
-points to memory that is not a valid part of the process
-address space.
.It Bq Er EINTR
.Fn nanosleep
was interrupted by the delivery of a signal.
.Fa rqtp
specified a nanosecond value less than zero
or greater than or equal to 1000 million.
-.It Bq Er ENOSYS
-.Fn nanosleep
-is not supported by this implementation.
.El
.Sh SEE ALSO
.Xr sigsuspend 2 ,