pread_args
{ .sy_narg = AS(pread_args), .sy_call = (sy_call_t *)sys_pread, .sy_auevent = AUE_PREAD, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 475 = pread */
sys_pread(struct thread *td, struct pread_args *uap)
struct pread_args *p = params;
int sys_pread(struct thread *, struct pread_args *);