MKDIR (man3p)
mkdir, mkdirat — make a directory
mkdir, mkdirat — make a directory
pthread_mutex_timedlock — lock a mutex
wcsspn — get the length of a wide substring
asinh, asinhf, asinhl — inverse hyperbolic sine functions
nanosleep — high resolution sleep
system — issue a command
mq_setattr — set message queue attributes (REALTIME)
tcflow — suspend or restart the transmission or reception of data
wcsftime — convert date and time to a wide-character string
vsnprintf, vsprintf — format output of a stdarg argument list