FLOCKFILE (man3p)
flockfile, ftrylockfile, funlockfile — stdio locking functions
flockfile, ftrylockfile, funlockfile — stdio locking functions
strtol, strtoll — convert a string to a long integer
wscanf — convert formatted wide-character input
vfwscanf, vswscanf, vwscanf — wide-character formatted input of a stdarg argument list
mblen — get number of bytes in a character
pthread_mutex_consistent — mark state protected by robust mutex as consistent
fma, fmaf, fmal — floating-point multiply-add
isgraph, isgraph_l — test for a visible character
seekdir — set the position of a directory stream
pthread_setschedprio — dynamic thread scheduling parameters access (REALTIME THREADS)