LSEEK (man3p)
lseek — move the read/write file offset
lseek — move the read/write file offset
vwprintf — wide-character formatted output of a stdarg argument list
writev — write a vector
posix_trace_attr_getinherited, posix_trace_attr_getlogfullpolicy, posix_trace_attr_getstreamfullpolicy, posix_trace_attr_setinherited, posix_trace_attr_setlogfullpolicy, posix_trace_attr_setstreamfullpolicy — retrieve and set the behavior of a trace stream (TRACING)
endhostent, gethostent, sethostent — network host database functions
sched_getscheduler — get scheduling policy (REALTIME)
pthread_getconcurrency, pthread_setconcurrency — get and set the level of concurrency
strstr — find a substring
lrand48 — generate uniformly distributed pseudo-random non-negative long integers
setutxent — reset the user accounting database to the first entry