open() openat() [Added in POSIX.1-2008] pause() poll() pread() pselect() pthread_cond_timedwait() pthread_cond_wait
open mem file are: read (2) pread (2) write (2) pwrite (2) lseek (2) These
full-duplex socket connection. Seeking, or calling pread (2) or pwrite (2) with a nonzero