TCDRAIN (man3p)
tcdrain — wait for transmission of output
tcdrain — wait for transmission of output
faccessat — determine accessibility of a file relative to directory file descriptor
wcstombs — convert a wide-character string to a character string
sin, sinf, sinl — sine function
sigsetjmp — set jump point for a non-local goto
siglongjmp — non-local goto with signal handling
tanh, tanhf, tanhl — hyperbolic tangent functions
grantpt — grant access to the slave pseudo-terminal device
getegid — get the effective group ID
realpath — resolve a pathname