isprint, isprint_l — test for a printable character
vdprintf, vfprintf, vprintf, vsnprintf, vsprintf — format output of a stdarg argument list
posix_spawnattr_getflags, posix_spawnattr_setflags — get and set the spawn-flags attribute of a spawn attributes object (ADVANCED REALTIME)
posix_trace_get_filter, posix_trace_set_filter — retrieve and set the filter of an initialized trace stream (TRACING)
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