POSIX_SPAWNATTR_GETSIGDEFAULT (man3p)
posix_spawnattr_getsigdefault, posix_spawnattr_setsigdefault — get and set the spawn-sigdefault attribute of a spawn attributes object (ADVANCED REALTIME)
posix_spawnattr_getsigdefault, posix_spawnattr_setsigdefault — get and set the spawn-sigdefault attribute of a spawn attributes object (ADVANCED REALTIME)
clock_nanosleep — high resolution sleep with specifiable clock
feholdexcept — save current floating-point environment
sleep — suspend execution for an interval of time
iscntrl, iscntrl_l — test for a control character
fstatvfs, statvfs — get file system information
mq_open — open a message queue (REALTIME)
wmemcpy — copy wide characters in memory
mq_timedreceive — receive a message from a message queue (ADVANCED REALTIME)
exit — terminate a process