Function nginx::process_vm_writev

pub unsafe extern "C" fn process_vm_writev(
    __pid: pid_t, 
    __lvec: *const iovec, 
    __liovcnt: c_ulong, 
    __rvec: *const iovec, 
    __riovcnt: c_ulong, 
    __flags: c_ulong
) -> ssize_t