Standard bioskey function

Hi,

I have faced the following code, can you help me to write a standard version of it:

Code:

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struct timeval tv;

int bioskey() {
    fd_set readfds;


    FD_ZERO (&readfds);
    FD_SET (fileno(stdin), &readfds);
    tv.tv_sec=0; tv.tv_usec=0;
    select(16, &readfds, 0, 0, &tv);


    return (FD_ISSET(fileno(stdin), &readfds));
}

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I get:

Code:

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error: call to undeclared function 'fileno';

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Did you "#include <stdio.h>" that declares the function, fileno().

You should also read the manual page for select() while you're at it.

I found this from stackoverflow:

Code:

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int bioskey(void)
{
    //struct timeval tv = { 0L, 0L };
    fd_set fds;
    FD_ZERO(&fds);
    FD_SET(0, &fds);
    return select(1, &fds, NULL, NULL, &tv) > 0;
}

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Depending on your system you may also need to define _POSIX_C_SOURCE before including stdio.h to use fileno:

Code:

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#define _POSIX_C_SOURCE
#include <stdio.h>

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