Function sys_clock_nanosleep 

pub fn sys_clock_nanosleep(
    clock_id: u32,
    flags: i32,
    req_ptr: u64,
    rem_ptr: u64,
) -> Result<u64, SyscallError>

SYS_CLOCK_NANOSLEEP: Sleep with clock selection and absolute/relative mode.

Arguments

• clock_id - Clock identifier (CLOCK_MONOTONIC or CLOCK_REALTIME)
• flags - 0 for relative sleep, TIMER_ABSTIME (1) for absolute wake-up time
• req_ptr - Pointer to timespec (absolute time if TIMER_ABSTIME, else duration)
• rem_ptr - Optional pointer to timespec for remaining time (relative mode only)

Returns

• 0 on success
• -EINTR if interrupted by a signal
• -EINVAL if clock_id or timespec is invalid
• -EFAULT if req_ptr is invalid

POSIX compatibility

POSIX signature: int clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *request, struct timespec *remain)