C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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_isatty
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _isatty function determines whether <handle> is associated with
     a character device (a terminal, console, printer, or serial port).
 
     Return Value
 
     The _isatty function returns a nonzero value if the device is a
     character device. Otherwise, the return value is 0.
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