COSL (man3p)
cosl — cosine function
cosl — cosine function
remque — remove an element from a queue
setsid — create session and set process group ID
sched_setscheduler — set scheduling policy and parameters (REALTIME)
fstat — get file status
kill — send a signal to a process or a group of processes
ftok — generate an IPC key
isdigit, isdigit_l — test for a decimal digit
puts — put a string on standard output
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared — get and set the process-shared attribute of the read-write lock attributes object