posix_trace_attr_getlogsize, posix_trace_attr_getmaxdatasize, posix_trace_attr_getmaxsystemeventsize, posix_trace_attr_getmaxusereventsize, posix_trace_attr_getstreamsize, posix_trace_attr_setlogsize, posix_trace_attr_setmaxdatasize, posix_trace_attr_setstreamsize — retrieve and set trace stream size attributes (TRACING)
seteuid — set effective user ID
setuid — set user ID
truncate — truncate a file to a specified length
pthread_attr_setscope — set the contentionscope attribute (REALTIME THREADS)
mq_timedsend — send a message to a message queue (ADVANCED REALTIME)
clock_getcpuclockid — access a process CPU-time clock (ADVANCED REALTIME)
sigemptyset — initialize and empty a signal set
toupper, toupper_l — transliterate lowercase characters to uppercase
cfgetispeed — get input baud rate