GETPGID (man3p)
getpgid — get the process group ID for a process
getpgid — get the process group ID for a process
shmctl — XSI shared memory control operations
fmin, fminf, fminl — determine minimum numeric value of two floating-point numbers
posix_trace_attr_setlogsize, posix_trace_attr_setmaxdatasize — retrieve and set trace stream size attributes (TRACING)
pthread_cond_broadcast, pthread_cond_signal — broadcast or signal a condition
pthread_getspecific, pthread_setspecific — thread-specific data management
isascii — test for a 7-bit US-ASCII character
pthread_attr_setguardsize — set the thread guardsize attribute
putwc — put a wide character on a stream
posix_spawnattr_getschedpolicy, posix_spawnattr_setschedpolicy — get and set the spawn-schedpolicy attribute of a spawn attributes object (ADVANCED REALTIME)