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#include <libc/ttyprvt.h> int __libc_termios_exist_queue (void);
This function checks whether there are any characters buffered in the termios internal queue. Functions that work on file handles which might be hooked by termios should call this function before they invoke system calls which test if there are any characters available for input.
Non-zero if some characters are buffered, zero otherwise.
not ANSI, not POSIX
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